DSH-201722F
July 17, 2012
CX93021-2x CSM92-SP
V.92 Controllered Serial Modem with
Speakerphone with CX20548 SmartDAA
and CX20452 Codec
Data Sheet
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
ii 2012 Conexant Systems, Inc. DSH-201722F
Revision Record
Revision
Date
Comments
A
7/14/2008
Initial release
B
7/29/2008
Rev B release
C
7/31/2008
Rev C release
D
8/15/2011
Rev D release
E
5/15/2012
Rev E release
F
7/17/2012
Rev F release
© 2008, 2011, 2012, Conexant Systems, Inc.
All Rights Reserved.
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conexant.tech.pubs@conexant.com. For technical questions, contact your local Conexant sales office or field applications engineer.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
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iv 2012 Conexant Systems, Inc. DSH-201722F
Contents
Document Revision History .......................................................................................................... ix
1. Introduction .......................................................................................................................... 1-1
1.1 Overview ................................................................................................................................................... 1-1
1.2 Features .................................................................................................................................................... 1-3
1.2.1 Applications ................................................................................................................................ 1-4
1.3 Technical Overview ................................................................................................................................... 1-5
1.3.1 General Description .................................................................................................................... 1-5
1.3.2 Embedded MCU Firmware ......................................................................................................... 1-5
1.3.3 Operating Modes ........................................................................................................................ 1-5
1.3.3.1 Data/Fax Modes ........................................................................................................... 1-5
1.3.3.2 V.44 Data Compression ................................................................................................ 1-6
1.3.3.3 Synchronous Access Mode (SAM) - Video Conferencing ............................................. 1-6
1.3.3.4 TAM Mode .................................................................................................................... 1-6
1.3.3.5 Speakerphone Mode (Optional) .................................................................................... 1-6
1.3.3.6 Worldwide Operation .................................................................................................... 1-7
1.3.4 Reference Designs ..................................................................................................................... 1-8
1.4 Hardware Description ................................................................................................................................ 1-9
1.4.1 CX93021-2x Modem ................................................................................................................... 1-9
1.4.2 Digital Isolation Barrier ................................................................................................................ 1-9
1.4.3 CX20452 Codec (Optional) ......................................................................................................... 1-9
1.4.4 CX20548 SmartDAA Line Side Device ....................................................................................... 1-9
1.5 Commands .............................................................................................................................................. 1-10
2. Technical Specifications ....................................................................................................... 2-1
2.1 Serial DTE Interface Operation ................................................................................................................. 2-1
2.1.1 Automatic Speed/Format Sensing .............................................................................................. 2-1
2.2 Establishing Data Modem Connections .................................................................................................... 2-2
2.2.1 Dialing ......................................................................................................................................... 2-2
2.2.2 Modem Handshaking Protocol .................................................................................................... 2-2
2.2.3 Call Progress Tone Detection ..................................................................................................... 2-2
2.2.4 Answer Tone Detection ............................................................................................................... 2-2
2.2.5 Ring Detection ............................................................................................................................ 2-2
2.2.6 Billing Protection ......................................................................................................................... 2-2
2.2.7 Connection Speeds .................................................................................................................... 2-3
2.2.8 Automode ................................................................................................................................... 2-3
2.3 Data Mode ................................................................................................................................................ 2-3
2.3.1 Speed Buffering (Normal Mode) ................................................................................................. 2-3
2.3.2 Flow Control ................................................................................................................................ 2-3
2.3.3 Escape Sequence Detection ....................................................................................................... 2-4
2.3.4 BREAK Detection ....................................................................................................................... 2-4
2.3.5 Telephone Line Monitoring ......................................................................................................... 2-4
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2.3.6 Fall Forward/Fallback (V.92/V.90/V.34/V.32bis/V.32) ................................................................. 2-4
2.3.7 Retrain ........................................................................................................................................ 2-4
2.3.8 Programmable Inactivity Timer ................................................................................................... 2-4
2.3.9 DTE Signal Monitoring ................................................................................................................ 2-4
2.3.10 Call Progress Speaker Interface ................................................................................................. 2-5
2.3.11 Serial EEPROM Interface ........................................................................................................... 2-5
2.4 V.92 Features............................................................................................................................................ 2-5
2.4.1 Modem-on-Hold .......................................................................................................................... 2-5
2.4.2 Quick Connect ............................................................................................................................ 2-5
2.4.3 PCM Upstream ........................................................................................................................... 2-6
2.5 Error Correction and Data Compression ................................................................................................... 2-6
2.5.1 V.42 Error Correction .................................................................................................................. 2-6
2.5.2 MNP 2-4 Error Correction ........................................................................................................... 2-6
2.5.3 V.44 Data Compression .............................................................................................................. 2-6
2.5.4 V.42bis Data Compression ......................................................................................................... 2-6
2.5.5 MNP 5 Data Compression .......................................................................................................... 2-6
2.6 Voice/Audio Mode ..................................................................................................................................... 2-7
2.6.1 Online Voice Command Mode .................................................................................................... 2-7
2.6.2 Voice Receive Mode ................................................................................................................... 2-7
2.6.3 Voice Transmit Mode .................................................................................................................. 2-7
2.6.4 Full-Duplex Receive and Transmit Mode .................................................................................... 2-7
2.6.5 Tone Detectors ........................................................................................................................... 2-7
2.6.6 Speakerphone Mode (Optional) .................................................................................................. 2-8
2.7 V.80 Synchronous Access Mode (SAM) ................................................................................................... 2-8
2.8 Full-Duplex Speakerphone (FDSP) Mode (Optional) ................................................................................ 2-8
2.9 Telephony Extensions ............................................................................................................................... 2-8
2.9.1 Line-in-Use Detection ................................................................................................................. 2-8
2.9.2 Extension Pick-up Detection ....................................................................................................... 2-9
2.9.3 Remote Hang-up Detection ........................................................................................................ 2-9
2.10 Point-of-Sales Support .............................................................................................................................. 2-9
2.11 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation ........................................................................... 2-9
2.12 Tone Detectors .......................................................................................................................................... 2-9
2.13 Call Waiting Tone Detection .................................................................................................................... 2-10
2.14 Caller ID .................................................................................................................................................. 2-10
2.15 Worldwide Country Support .................................................................................................................... 2-10
2.16 Diagnostics ............................................................................................................................................. 2-11
2.17 Low Power Modes ................................................................................................................................... 2-11
2.17.1 Idle Mode .................................................................................................................................. 2-11
2.17.2 Sleep Mode ............................................................................................................................... 2-11
2.17.3 Deep Sleep Mode ..................................................................................................................... 2-11
2.17.4 Stop Mode ................................................................................................................................ 2-11
3. Hardware Interface ............................................................................................................... 3-1
3.1 CX93021-2x Modem Hardware Interface Signals ..................................................................................... 3-1
3.1.1 CX93021-2x Modem Interface Signal Summary ......................................................................... 3-1
3.1.1.1 LSD Interface (Through DIB) ........................................................................................ 3-1
3.1.1.2 Call Progress Speaker Interface ................................................................................... 3-1
3.1.1.3 Clock Select Interface ................................................................................................... 3-1
3.1.1.4 Serial EEPROM Interface ............................................................................................. 3-1
3.1.1.5 Serial DTE Interface and Indicator Outputs .................................................................. 3-1
3.1.1.6 CX20452 Codec Interfaces ........................................................................................... 3-2
3.1.2 CX93021-2x Modem Pin Assignments and Signal Definitions .................................................... 3-3
3.1.3 CX93021-2x Modem Electrical Characteristics ........................................................................... 3-7
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3.2 CX20548 LSD Hardware Pins and Signals ............................................................................................... 3-8
3.2.1 General ....................................................................................................................................... 3-8
3.2.1.1 Host Side Device (HSD) Interface (Through DIB) ......................................................... 3-8
3.2.1.2 Power and Ground ........................................................................................................ 3-8
3.2.1.3 Telephone Line Interface .............................................................................................. 3-8
3.2.1.4 Voltage References ...................................................................................................... 3-8
3.2.1.5 General Purpose Input/Output ...................................................................................... 3-8
3.2.2 Pin Assignments and Signal Definitions ...................................................................................... 3-9
3.3 CX20452 Codec Hardware Interface Signals .......................................................................................... 3-13
3.3.1 CX20452 Codec Pin Assignments and Signal Definitions ........................................................ 3-13
3.3.2 CX20452 Codec Electrical Characteristics ............................................................................... 3-16
3.4 Operating Conditions, Absolute Maximum Ratings, and Power Requirements ....................................... 3-17
3.5 Crystal and Clock Specifications ............................................................................................................. 3-20
4. Package Dimensions ........................................................................................................... 4-1
5. Recommended QFN Surface Mount Land Pattern .............................................................. 5-1
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
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Figures
Figure 1-1. CSM92-SP Modem Simplified Interface Diagram .................................................................................... 1-2
Figure 3-1. CX93021-2x Modem Hardware Interface Signals .................................................................................... 3-3
Figure 3-2. CX93021-2x Modem 36-Pin QFN Pin Signals ......................................................................................... 3-4
Figure 3-3. CX20548 LSD Hardware Interface Signals .............................................................................................. 3-9
Figure 3-4. CX20548 LSD 16-Pin QFN Pin Signals ................................................................................................. 3-10
Figure 3-5. CX20452 Codec Hardware Interface Signals ........................................................................................ 3-13
Figure 3-6. CX20452 Codec 24-Pin QFN Pin Signals .............................................................................................. 3-14
Figure 4-1. Package Dimensions for 36-Pin QFN ...................................................................................................... 4-2
Figure 4-2. Package Dimensions for 24-Pin QFN ...................................................................................................... 4-3
Figure 4-3. Package Dimensions for 16-Pin QFN, Punch Style ................................................................................. 4-5
Figure 4-4. Package Dimensions for 16-Pin QFN, Sawn Style .................................................................................. 4-5
Figure 5-1. Recommended Surface Mount Land Pattern for 36-Pin QFN .................................................................. 5-1
Figure 5-2. Recommended Surface Mount Land Pattern for 24-Pin QFN ................................................................. 5-2
Figure 5-3. Recommended Surface Mount Land Pattern for 16-Pin QFN .................................................................. 5-3
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
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Tables
Table 1-1. CSM92-SP Ordering Information .............................................................................................................. 1-2
Table 1-2. Default Countries Supported ..................................................................................................................... 1-7
Table 2-1. +MS Command Automode Connectivity ................................................................................................... 2-3
Table 3-1. CX93021-2x Modem 36-Pin QFN Pin Signals .......................................................................................... 3-4
Table 3-2. CX93021-2x Modem Hardware Signal Definitions .................................................................................... 3-5
Table 3-3. CX93021-2x Modem I/O Type Definitions ................................................................................................. 3-7
Table 3-4. CX93021-2x Modem DC Electrical Characteristics ................................................................................... 3-7
Table 3-5. CX20548 LSD 16-Pin QFN Pin Signals .................................................................................................. 3-10
Table 3-6. CX20548 LSD Hardware Signal Definitions ............................................................................................ 3-11
Table 3-7. CX20548 LSD GPIO DC Electrical Characteristics ................................................................................. 3-12
Table 3-8. CX20548 LSD AVDD and DVDD DC Electrical Characteristics .............................................................. 3-12
Table 3-9. CX20452 Codec 24-Pin QFN Pin Signals ............................................................................................... 3-14
Table 3-10. CX20452 Codec Hardware Signal Definitions ....................................................................................... 3-15
Table 3-11. CX20452 Codec DC Electrical Characteristics ..................................................................................... 3-16
Table 3-12. CX20452 Codec Analog Electrical Characteristics ............................................................................... 3-16
Table 3-13. CX93021-2x Modem and CX20452 Codec Operating Conditions ........................................................ 3-17
Table 3-14. Absolute Maximum Ratings .................................................................................................................. 3-18
Table 3-15. CX93021-2x Current and Power Requirements .................................................................................... 3-19
Table 3-16. CX20452 Codec Current Requirements ................................................................................................ 3-19
Table 3-17. Crystal Specifications ............................................................................................................................ 3-20
Table 3-18. Clock Specifications .............................................................................................................................. 3-20
Table 4-1. Common Table for 16-QFN Punch and Sawn Style Package Dimensions ............................................... 4-4
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
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Document Revision History
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 1-1
1. Introduction
1.1 Overview
The Conexant CSM92-SP V.92 Modem supports V.92 analog data modem operation
and 14.4 kbps fax modem operation. In addition, the modem supports remote telephone
answering machine (TAM) and speakerphone. The modem also supports
V.44/V.42bis/MNP 5 data compression for greater data throughput and V.42
LAPM/MNP2-4 error correction protocol for increased data integrity and reliability.
The CSM92-SP device set consists of a CX93021-2x V.92 Modem device in a 36-pin
QFN, a CX20548 SmartDAA 4 Line Side Device (LSD) in a 16-pin QPN, and a
CX20452 Codec in a 24-pin QFN. The CSM92 device set is also available that does not
include the CX20452 Codec and does not support speakerphone. The CX93021-2x has a
serial interface and codec interface for connection to the optional CX20452 Codec for
speakerphone applications. Table 1-1 lists the ordering information.
The CX93021-2x modem device integrates a microcontroller (MCU), a digital signal
processor (DSP), internal RAM, internal ROM, and a SmartDAA system side device
(SSD) onto a 36-pin QFN. Figure 1-1 illustrates the top-level modem interface.
Conexant’s SmartDAA technology used in the SmartDAA 4 LSD eliminates the need for
bulky analog transformers, relays, and opto-isolators typically used in discrete DAA
implementations. The SmartDAA 4 LSD operates without drawing power from the phone
line, unlike line-powered DAAs, and is therefore not subject to variations in line voltage
conditions. The SmartDAA 4 LSD also adds enhanced telephony extension features to
the modem’s operation and other functions such as Call Waiting detection, and Caller ID
decoding. Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design
and other innovative DAA features, the SmartDAA architecture simplifies application
design and minimizes layout area to reduce design cost.
The CSM92-SP modem supports position independent, full-duplex speakerphone (FDSP)
operation using microphone and speaker, as well as other voice/TAM applications using
handset or headset.
In TAM mode, enhanced 2-bit or 4-bit per sample coding schemes at 8 kHz sample rate
provide flexible format compatibility and allows efficient digital storage of voice/audio.
Also supported are 8-bit A-law, -law, and linear coding and IMA 4-bit ADPCM coding.
This mode supports applications such as digital telephone answering machine, voice
annotation, and recording from and playback to the telephone line.
The modem operates by executing masked code from internal ROM. The modem features
internal RAM memory that enhances the modem's flexibility. The modem's internal
RAM can be used to load new country profiles, override existing country profiles or add
customized firmware code. An optional external serial NVRAM is supported. The
optional external NVRAM adds the convenience of permanent storage, just like internal
RAM, NVRAM can be used to store new country profiles, override existing ones or add
customized firmware code.
Small, low-profile packages, reduced voltage operation, and low power consumption
make this device set an ideal solution for embedded applications.
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Table 1-1. CSM92-SP Ordering Information
Model/Order/Part Numbers
Supported Functions
Marketing
Name
Device Set
Order No.
Modem Device
[36-Pin QFN]
Part No.
Line Side Device (LSD)
[16-Pin QFN]
Part No.
Codec
[24-Pin QFN]
Part No.
V.92
Data
V.34
Data
V.32bis
Data
Fax Class 1 &
2, TAM,
Speakerphone
CSM92-SP
DS92-CSMSP-21Z
CX93021-21Z
CX20548-11Z (Note 3)
CX20452-A
Y
Y
Y
Y
CSM34-SP
DS34-CSMSP-22Z
CX93021-22Z
CX20548-11Z (Note 3)
CX20452-A
—
Y
Y
Y
CSM32-SP
DS32-CSMSP-23Z
CX93021-23Z
CX20548-11Z (Note 3)
CX20452-A
—
—
Y
Y
Notes:
1. Supported functions (Y = Supported; — = Not supported).
2. All devices are lead-free (Pb-free) and RoHS-compliant. These devices are compatible with leaded reflow processes.
3.. Device is marked 20548-A on the package
Figure 1-1. CSM92-SP Modem Simplified Interface Diagram
CX93021-2x Modem
36-Pin QFN
MCU/DSP/
SmartDAA
Interface
DTE/Host
Interface
Serial
Interface
RAM
TIP
RING
External
Discrete
Components
Telephone
Line
Digital Isolation
Barrier (DIB)
CX20548
SmartDAA 4
Line Side Device (LSD)
16-Pin QFN
Line Side
DIB
Interface
(LSDI)
Codec
Telephone
Line
Interface
DAA Hardware
ROM
Optional
NVRAM
28.224 MHz
or
27.000 MHz
Crystal orClock
Source
Mic
CX20452
Codec
24-Pin QFN
(Optional) Speaker
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1.2 Features
Modulations and protocols
ITU-T V.92 (V.92 model)
Modem-on-Hold (MOH)
Quick connect (QC)
PCM upstream
V.90 (V.92 model)
V.34 (V.92 and V.34 models)
V.32bis, V.32, V.22bis, V.22, V.23, V.21
V.23 reverse, V.23 half-duplex
Bell 212A/Bell 103
V.29 FastPOS
V.22bis fast connect
V.80 Synchronous Access Mode
Data compression and error correction
V.44 data compression
V.42bis and MNP 5 data compression
V.42 LAPM and MNP 2-4 error correction
Fax modem send and receive rates up to 14.4 kbps
V.17, V.29, V.27 ter, and V.21 channel 2
EIA/TIA 578 Class 1, T.31 Class 1.0, and Class 2
Call Waiting (CW) detection and Type II Caller ID decoding during data mode
Type I Caller ID (CID) decoding
Telephony/TAM
V.253 commands
2-bit and 4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit linear PCM, and
8-bit -law and A-law PCM coding
8 kHz sample rate
Concurrent DTMF, ring, and Caller ID detection
DTE/host interface
Serial DTE interface
Direct Mode
Asynchronous Mode
No external memory required
Sixty-three embedded and upgradeable country profiles
Serial NVRAM interface for optional permanent country profile storage
Embedded AT commands
Full-duplex speakerphone (FDSP) mode using CX20452 Codec (optional)
Microphone and speaker interface
Telephone handset or headset interface
Acoustic and line echo cancellation
Microphone gain and muting
Speaker volume control and muting
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SmartDAA
Extension pick-up detection
Digital line protection
Line reversal detection
Line-in-use detection
Remote hang-up detection
Worldwide compliance
Selectable 28.224 MHz or 27.000 MHz frequency of operation
Low power and voltage
Single +5V supply
Low power consumption mode
+3.3V I/O level
Compact, robust board design
Small, low-profile modem packages
SmartDAA and DIB technologies
Reference design supports 5 kV isolation
Small packages
CX93021-2x Modem: 36-pin QFN
CX20548 LSD: 16-pin QFN
CX20452 Codec: 24-pin QFN
1.2.1 Applications
Internet appliances
Video game consoles
Video phone terminals
Retail modems
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1.3 Technical Overview
1.3.1 General Description
Modem operation, including dialing, call progress, telephone line interface, telephone
handset interface, and host DTE interface functions are supported and controlled through
the V.250 and V.253-compatible command set.
The OEM adds a crystal circuit, DIB components, telephone line interface, telephone
handset/telephony extension interface, and other supporting discrete components as
supported by the modem model (Table 1-1) and required by the application to complete
the system.
1.3.2 Embedded MCU Firmware
Embedded MCU firmware performs processing of general modem control, command
sets, data modem, error correction and data compression (ECC), worldwide, V.80, and
serial DTE host interface functions according to modem models (Table 1-1).
1.3.3 Operating Modes
1.3.3.1 Data/Fax Modes
Data modem modes perform complete handshake and data rate negotiations. Using
modem modulations to optimize modem configuration for line conditions, the modem
can connect at the highest data rate that the channel can support from 56 kbps down to
2400 bps with automatic fallback.
In V.92 data modem mode, the modem can receive data from a digital source using a
V.92-compatible central site modem at line speeds up to 56 kbps. With PCM upstream
enabled, data transmission supports sending data at line speeds up to 48 kbps. When
PCM upstream is disabled, data transmission supports sending data at line speeds up to
V.34 rates. This mode can fallback to V.34 mode and to lower rates as dictated by line
conditions.
The following modes in V.92 models are also supported when connected to a V.92-
compatible server supporting the feature listed.
Quick connect, which allows quicker subsequent connection to a server using stored
line parameters obtained during the initial connection. The server must support quick
connect profiles.
Modem-on-Hold, which allows detection and reporting of incoming phone calls on
the PSTN with enabled Call Waiting. If the incoming call is accepted by the user, the
user has a pre-defined amount of time of holding the data connection for a brief
conversation. The data connection resumes upon incoming call termination. The
server must support Modem-on-Hold functionality.
PCM upstream, which boosts the upstream data rates between the user and V.92
server. A maximum of 48 kbps upstream rate is supported when connected to a V.92
server that supports PCM upstream.
In V.34 data modem mode, the modem can operate in 2-wire, full-duplex, asynchronous
modes at line rates up to 33.6 kbps. Data modem modes perform complete handshake and
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data rate negotiations. Using V.34 modulation to optimize modem configuration for line
conditions, the modem can connect at the highest data rate that the channel can support
from 33600 bps down to 2400 bps with automatic fallback. Automode operation in V.34
is provided in accordance with PN3320 and in V.32bis in accordance with PN2330. All
tone and pattern detection functions required by the applicable ITU or Bell standards are
supported.
In V.32bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.
In fax modem mode, the modem can operate in 2-wire, half-duplex, synchronous modes
and can support Group 3 facsimile send and receive speeds of 14400, 12000, 9600, 7200,
4800, and 2400 bps. Fax data transmission and reception performed by the modem are
controlled and monitored through the EIA/TIA-578 Fax Class 1, T.31 Fax Class 1.0, or
Fax Class 2 command interface. Full HDLC formatting, zero insertion/deletion, and CRC
generation/checking are provided.
1.3.3.2 V.44 Data Compression
V.44 provides more efficient data compression than V.42bis that significantly decreases
the download time for the types of files associated with Internet use. This significant
improvement is most noticeable when browsing and searching the web since HTML text
files are highly compressible. (The improved performance amount varies both with the
actual format and with the content of individual pages and files.)
1.3.3.3 Synchronous Access Mode (SAM) - Video Conferencing
V.80 Synchronous Access Mode between the modem and the host/DTE is provided for
host-controlled communication protocols, e.g., H.324 video conferencing applications.
1.3.3.4 TAM Mode
TAM Mode features include 2-bit/4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit
linear PCM, and 8-bit -law and A-law PCM coding at 8 kHz sample rate. Tone
detection/ generation, call discrimination, and concurrent DTMF detection are also
supported.
TAM Mode is supported by four submodes:
Online Voice Command Mode supports connection to the telephone line.
Voice Receive Mode supports recording voice or audio data input from the telephone
line.
Voice Transmit Mode supports playback of voice or audio data to the telephone line.
Full-duplex Receive and Transmit Mode.
1.3.3.5 Speakerphone Mode (Optional)
When using the optional CX20452 Codec, the modem includes additional telephone
handset, external microphone, and external speaker interfaces which support voice and
full-duplex speakerphone (FDSP) operation.
Hands-free full-duplex telephone operation is supported in Speakerphone Mode under
host control. Speakerphone Mode features an advanced proprietary speakerphone
algorithm which supports full-duplex voice conversation with acoustic, line, and handset
echo cancellation. Parameters are constantly adjusted to maintain stability with automatic
fallback from full-duplex to pseudo-duplex operation. The speakerphone algorithm
allows position independent placement of microphone and speaker. The host can
separately control volume, muting, and AGC in microphone and speaker channels.
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1.3.3.6 Worldwide Operation
The modem operates in TBR21-compliant and other countries. Country-dependent
modem parameters for functions such as dialing, carrier transmit level, calling tone, call
progress tone detection, answer tone detection, blacklisting, caller ID, and relay control
are programmable.
SmartDAA technology allows a single PCB design and single BOM to be homologated
worldwide. Advanced features such as extension pick-up detection, remote hang-up
detection, line-in-use detection, and digital PBX line protection are supported.
Country code IDs are defined by ITU-T T.35.
Internal ROM includes default profiles for 63 countries including TBR21-compliant
profiles. An additional or modified country profile can be loaded into internal SRAM. A
duplicate country profile stored in internal SRAM will override the profile in internal
ROM firmware. Additional country profiles can be loaded into external NVRAM for
permanent storage. The default countries supported are listed in Table 1-2. Request
additional country profiles from a Conexant Sales Office.
Table 1-2. Default Countries Supported
Country
Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
Argentina
7
X
X
Australia
9
X
X
X
Austria
0A
X
X
X
Belgium
0F
X
X
Brazil
16
X
X
Bulgaria
1B
X
X
Canada
20
X
X
X
Chile
25
X
X
China
26
X
X
X
Colombia
27
X
X
Croatia
FA
X
X
Cyprus
2D
X
X
Czech Republic
2E
X
X
Denmark
31
X
X
X
Egypt
36
X
X
Estonia
F9
X
X
Finland
3C
X
X
X
France
3D
X
X
X
Germany
42
X
X
X
Greece
46
X
X
Hong Kong
50
X
X
X
Hungary
51
X
X
Iceland
52
X
X
India
53
X
X
X
Indonesia
54
X
X
Ireland
57
X
X
X
Israel
58
X
X
Italy
59
X
X
X
Japan
00
X
X
X
Korea
61
X
X
X
Kuwait
62
X
X
Lebanon
64
X
X
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Country
Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
Luxembourg
69
X
X
Malaysia
6C
X
X
Mexico
73
X
X
Morocco
77
X
X
Netherlands
7B
X
X
X
New Zealand
7E
X
X
X
Norway
82
X
X
X
Pakistan
84
X
X
Philippines
89
X
X
Poland
8A
X
X
Portugal
8B
X
X
Romania
8E
X
X
Russia
B8
X
X
Saudi Arabia
98
X
X
Senegal
99
X
X
Singapore
9C
X
X
X
Slovakia
FB
X
X
Slovenia
FC
X
X
South Africa
9F
X
X
Spain
A0
X
X
X
Sri Lanka
A1
X
X
Sweden
A5
X
X
X
Switzerland
A6
X
X
Taiwan
FE
X
X
X
Thailand
A9
X
X
Tunisia
AD
X
X
Turkey
AE
X
X
UK
B4
X
X
X
United Arab Emirates
B3
X
X
Uruguay
B7
X
X
USA
B5
X
X
X
Reserved
FD
1.3.4 Reference Designs
A reference design consisting of a motherboard and daughtercard set is
available to minimize modem design time, reduce development cost, and
accelerate market entry. The part numbers for this design are: CX-9Z-C00217
(motherboard) and CX-9Z-C00234 (daughtercard).
A reference modem user’s guide (USG-201693) is available in electronic form.
This user’s guide includes schematics, bill of materials (BOM), vendor part
list (VPL), board layout files, and complete documentation.
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1.4 Hardware Description
1.4.1 CX93021-2x Modem
The CX93021-2x modem includes a Microcontroller (MCU), a Modem Data Pump
(MDP), internal ROM, internal RAM, and SmartDAA interface functions.
The modem connects to host via a logical V.24 (EIA/TIA-232-E) serial DTE interface.
The modem MCU/DSP performs the command processing, host interface functions and
telephone line signal modulation/demodulation which reduces computational load on the
host processor.
The SmartDAA Interface communicates with, and supplies power and clock to the LSD
through the DIB.
1.4.2 Digital Isolation Barrier
The OEM-supplied Digital Isolation Barrier (DIB) electrically DC isolates the CX93021-
2x from the LSD and telephone line. The modem is connected to a fixed digital ground
and operates with standard CMOS logic levels. The LSD is connected to a floating
ground and can tolerate high voltage input (compatible with telephone line and typical
surge requirements).
The DIB transformer couples power and clock from the CX93021-2x to the LSD.
The DIB data channel supports bidirectional half-duplex serial transfer of data, control,
and status information between the CX93021-2x and the LSD over two lines.
1.4.3 CX20452 Codec (Optional)
The optional CX20452 Codec (VC), packaged in a 24-pin QFN, supports voice/full-
duplex speakerphone (FDSP) operation with interfaces to a microphone and speaker and
to a telephone handset/headset.
1.4.4 CX20548 SmartDAA Line Side Device
The CX20548 SmartDAA 4 Line Side Device (LSD) includes a Line Side DIB Interface,
a coder/decoder (codec), and a Telephone Line Interface (TLI).
The Line Side DIB Interface communicates with, and receives power and clock from, the
SmartDAA 4 interface in the host side device (HSD) through the DIB transformer. The
clock signal passing through the transformer is rectified in the LSD and filtered using
external capacitors.
Information is transferred between the LSD and the HSD through the DIB transformer
using pulse width modulation
The TLI integrates DAA and direct telephone line interface functions and connects
directly to the line TIP and RING pins, as well as to external line protection components.
Direct LSD connection to TIP and RING allows real-time measurement of telephone line
parameters, such as the telephone central office (CO) battery voltage, individual
telephone line (copper wire) resistance, and allows dynamic regulation of the off-hook
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TIP and RING voltage and total current drawn from the central office (CO). This allows
the modem to maintain compliance with U.S. and worldwide regulations.
1.5 Commands
The modem supports data modem, fax class 1, 1.0, or 2 modem, TAM, V.80 commands,
and S Registers in accordance with modem model options. See Doc. REM-201692 for a
description of the commands.
Data Modem Operation. Data modem functions operate in response to the AT
commands when +FCLASS=0. Default parameters support U.S./Canada operation.
Fax Mode Operation. Facsimile functions operate in response to fax class 1 commands
when +FCLASS=1, to fax class 1.0 commands when +FCLASS=1.0, or to fax class 2
commands when +FCLASS=2.
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2. Technical Specifications
2.1 Serial DTE Interface Operation
2.1.1 Automatic Speed/Format Sensing
Command Mode and Data Mode. The modem can automatically determine the speed
and format of the data sent from the DTE. The modem can sense speeds of 300, 600,
1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400,
28800, 38400, 57600, and 115200 bps and the following data formats:
Parity
Data Length
(No. of Bits)
No. of
Stop Bits
Character Length
(No. of Bits)
None
7
2
10
Odd
7
1
10
Even
7
1
10
None
8
1
10
Odd
8
1
11*
Even
8
1
11*
*11-bit characters are sensed, but the parity bit is stripped off during
data transmission in Normal and Error Correction modes.
The modem can speed sense data with mark or space parity and configures itself as
follows:
DTE Configuration
Modem Configuration
7 mark
7 none
7 space
8 none
8 mark
8 none
8 space
8 even
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2.2 Establishing Data Modem Connections
2.2.1 Dialing
DTMF Dialing. DTMF dialing using DTMF tone pairs is supported in accordance with
ITU-T Q.23.
Pulse Dialing. Pulse dialing is supported in accordance with EIA/TIA-496-A.
Blind Dialing. The modem can blind dial in the absence of a dial tone if enabled by the
X0, X1, or X3 command.
2.2.2 Modem Handshaking Protocol
If a tone is not detected within the time specified in the S7 register after the last digit is
dialed, the modem aborts the call attempt.
2.2.3 Call Progress Tone Detection
Ringback, equipment busy, congested tone, warble tone, and progress tones can be
detected in accordance with the applicable standard.
2.2.4 Answer Tone Detection
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes
and 2225 ± 40 Hz in Bell modes.
2.2.5 Ring Detection
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave
input.
2.2.6 Billing Protection
When the modem goes off-hook to answer an incoming call, both transmission and
reception of data are prevented for 2 seconds to allow transmission of the billing tone
signal.
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2.2.7 Connection Speeds
The modem functions as a data modem when the +FCLASS=0 command is active.
Line connection can be selected using the +MS command. The +MS command selects
modulation, enables/disables automode, and selects minimum and maximum line speeds
(Table 2-1).
Table 2-1. +MS Command Automode Connectivity
Modulation
<carrier>
Possible (<min_rx_rate>, <min_rx_rate>,
(<min_tx_rate>), and <max_tx_rate>) Rates (bps)
Bell 103
B103
300
Bell 212
B212
1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21
V21
300
V.22
V22
1200
V.22bis
V22B
2400 or 1200
V.23
V23C
1200
V.32
V32
9600 or 4800
V.32bis
V32B
14400, 12000, 9600, 7200, or 4800
V.34/V.90 upstream
V34/V90
33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
V.90 downstream
V90
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92 downstream
V92
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92 upstream
V92
48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000
2.2.8 Automode
Automode detection can be enabled by the +MS command to allow the modem to
connect to a remote modem in accordance with draft PN-3320 for V.34 (Table 2-1).
2.3 Data Mode
Data mode exists when a telephone line connection has been established between
modems and all handshaking has been completed.
2.3.1 Speed Buffering (Normal Mode)
Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed
different than the line speed. The modem supports speed buffering at all line speeds.
2.3.2 Flow Control
DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-to-
modem speed, the modem supports XOFF/XON or RTS/CTS flow control with the DTE
to ensure data integrity.
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2.3.3 Escape Sequence Detection
The +++ escape sequence can be used to return control to the command mode from the
data mode. Escape sequence detection is disabled by an S2 Register value greater than
127.
2.3.4 BREAK Detection
The modem can detect a BREAK signal from either the DTE or the remote modem. The
\Kn command determines the modem response to a received BREAK signal.
2.3.5 Telephone Line Monitoring
GSTN Cleardown (V.92, V.90, V.34, V.32bis, V.32). Upon receiving GSTN Cleardown
from the remote modem in a non-error correcting mode, the modem cleanly terminates
the call.
Loss of Carrier (V.22bis and Below). If carrier is lost for a time greater than specified
by the S10 register, the modem disconnects.
2.3.6 Fall Forward/Fallback (V.92/V.90/V.34/V.32bis/V.32)
During initial handshake, the modem will fallback to the optimal line connection within
V.92/V.90/V.34/V.32bis/V.32 mode depending upon signal quality if automode is
enabled by the +MS or N1 command.
When connected in V.92/V.90/V.34/V.32bis/V.32 mode, the modem will fall forward or
fallback to the optimal line speed within the current modulation depending upon signal
quality if fall forward/fallback is enabled by the %E2 command.
2.3.7 Retrain
The modem may lose synchronization with the received line signal under poor or
changing line conditions. If this occurs, retraining may be initiated to attempt recovery
depending on the type of connection.
The modem initiates a retrain if line quality becomes unacceptable if enabled by the %E
command. The modem continues to retrain until an acceptable connection is achieved, or
until 30 seconds elapse resulting in line disconnect.
2.3.8 Programmable Inactivity Timer
The modem disconnects from the line if data is not sent or received for a specified length
of time. In normal or error-correction mode, this inactivity timer is reset when data is
received from either the DTE or from the line. This timer can be set to a value between 0
and 255 seconds by using register S30. A value of 0 disables the inactivity timer.
2.3.9 DTE Signal Monitoring
DTR#. When DTR# is asserted, the modem responds in accordance with the &Dn and
&Qn commands.
RTS#. RTS# is used for flow control if enabled by the &K command in normal or error-
correction mode.
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2.3.10 Call Progress Speaker Interface
A digital speaker output (DSPKOUT) is supported. DSPKOUT is a square wave output
in Data mode used for call progress or carrier monitoring. This output can be optionally
connected to a low-cost on-board speaker, e.g., a sounducer, or to an analog speaker
circuit.
2.3.11 Serial EEPROM Interface
The 36-pin QFN supports a 2-line serial interface to an optional serial EEPROM.
The EEPROM can hold information such as firmware customization, and country code
parameters. Data stored in EEPROM takes precedence over the factory default settings.
A serial EEPROM is required only if additional storage is required for more country
profiles or customized firmware code.
The EEPROM size can range from 2 Kb (256 x 8) to 256 Kb (32K x 8) and must support
a clock frequency of at least 400 kHz. For overriding, adding new country profiles, or
loading NVRAM patches, the EEPROM size must be larger than 2Kb. The size of the
EEPROM device will depend on the number of country profiles added or patch size.
2.4 V.92 Features
Modem-on-Hold, quick connect, and PCM upstream are only available when connecting
in V.92 data mode. V.92 features are only available when the server called is a V.92
server that supports that particular feature.
2.4.1 Modem-on-Hold
The Modem-on-Hold (MOH) function enables the modem to place an Internet data
connection on hold while using the same line to accept an incoming or place an outgoing
voice call. This feature is available only with a connection to a server supporting MOH.
MOH can be executed through either of two methods:
One method is to enable MOH through the +PMH command. With Call Waiting
Detection (+PCW command) enabled, an incoming call can be detected while on-
line. Using a string of commands, the modem negotiates with the server to place the
data connection on hold while the line is released so that it can be used to conduct a
voice call. Once the voice call is completed, the modem can quickly renegotiate with
the server back to the original data call.
An alternative method is to use communications software that makes use of the
Conexant Modem-on-Hold drivers. Using this method, the software can detect an
incoming call, place the data connection on hold, and switch back to a data
connection.
2.4.2 Quick Connect
The quick connect function enables the modem to shorten the connect time of subsequent
calls to a server supporting quick connect. The quick connect feature is supported by the
+PQC command.
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2.4.3 PCM Upstream
PCM upstream boosts the upstream data rates between the user and ISP to reduce upload
times for large files and email attachments. A maximum of 48 kbps upstream rate is
supported with PCM upstream enabled, in contrast to a maximum of 32.2 kbps upstream
rate with PCM upstream not enabled. PCM upstream is supported by the +PCM
command. PCM upstream is disabled by default.
2.5 Error Correction and Data Compression
2.5.1 V.42 Error Correction
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The
modem provides a detection and negotiation technique for determining and establishing
the best method of error correction between two modems.
2.5.2 MNP 2-4 Error Correction
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data
integrity. Supporting stream mode, the modem sends data frames in varying lengths
depending on the amount of time between characters coming from the DTE.
2.5.3 V.44 Data Compression
V.44 data compression encodes pages and files associated with Web pages more
efficiently than V.42bis. These files include WEB pages, graphics and image files, and
document files. V.44 can provide an effective data throughput rate up to DTE rate for a
56-kbps connection. The improved performance amount varies both with the actual
format and with the content of individual pages and files.
2.5.4 V.42bis Data Compression
V.42bis data compression mode, enabled by the %Cn command or S46 register, operates
when a LAPM connection is established.
The V.42bis data compression employs a “string learning” algorithm in which a string of
characters from the DTE is encoded as a fixed length codeword and stored in a
dictionary. The dictionary is dynamically updated during normal operation.
2.5.5 MNP 5 Data Compression
MNP 5 data compression mode, enabled by the %Cn command, operates during an MNP
connection.
In MNP 5, the modem increases its throughput by compressing data into tokens before
transmitting it to the remote modem, and by decompressing encoded received data before
sending it to the DTE.
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2.6 Voice/Audio Mode
Voice and audio functions are supported by the Voice Mode. Voice Mode includes four
submodes: Online Voice Command Mode, Voice Receive Mode, Voice Transmit Mode
and Full-Duplex Receive and Transmit Mode.
2.6.1 Online Voice Command Mode
This mode results from the connection to the telephone line or a voice/audio I/O device
(e.g., microphone, speaker, or handset) through the use of the +FCLASS=8 and +VLS
commands. After mode entry, AT commands can be entered without aborting the
connection.
2.6.2 Voice Receive Mode
This mode is entered when the +VRX command is active in order to record voice or
audio data input at the RIN pin, typically from a microphone/handset or the telephone
line.
Received analog voice samples are converted to digital form and compressed for reading
by the host. AT commands control the codec bits-per-sample rate.
Received analog mono audio samples are converted to digital form and formatted into
8-bit unsigned linear PCM format for reading by the host. AT commands control the bit
length and sampling rate. Concurrent DTMF/tone detection is available at the 8 kHz
sample rate.
2.6.3 Voice Transmit Mode
This mode is entered when the +VTX command is active in order to playback voice or
audio data to the TXA output, typically to a speaker/handset or to the telephone line.
Digitized voice data is decompressed and converted to analog form at the original
compression quantization sample-per-bits rate then output to the TXA output.
Digitized audio data is converted to analog form then output to the TXA output.
2.6.4 Full-Duplex Receive and Transmit Mode
This mode is entered when the +VTR command is active in order to concurrently receive
and transmit voice.
2.6.5 Tone Detectors
The tone detector signal path is separate from the main received signal path thus enabling
tone detection to be independent of the configuration status. In Tone Mode, all three tone
detectors are operational.
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2.6.6 Speakerphone Mode (Optional)
Speakerphone mode is controlled in voice mode with the following commands:
Use Speakerphone After Dialing or Answering (+VSP=1). +VSP=1 selects
speakerphone mode while in +FCLASS=8 mode. Speakerphone operation is entered
during Voice Online Command mode after completing dialing or answering.
Speakerphone Settings. The +VGM and +VGS commands can be used to control the
microphone gain and speaker volume, respectively. VGM and +VGS commands are valid
only after the modem has entered the Voice Online mode while in the +VSP=1 setting.
2.7 V.80 Synchronous Access Mode (SAM)
V.80 Synchronous Access Mode between the modem and the host/DTE is provided for
host-controlled communication protocols, e.g., H.324 video conferencing applications.
Voice-call-first (VCF) before switching to a videophone call is also supported.
2.8 Full-Duplex Speakerphone (FDSP) Mode (Optional)
The modem operates in FDSP mode when +FCLASS=8 and +VSP=1 (Section 2.6.6).
In FDSP Mode, speech from a microphone or handset is converted to digital form,
shaped, and output to the telephone line through the line interface circuit. Speech
received from the telephone line is shaped, converted to analog form, and output to the
speaker or handset. Shaping includes both acoustic and line echo cancellation.
2.9 Telephony Extensions
The following telephony extension features are supported and are typically implemented
in designs for set-top box applications to enhance end-user experience:
Line-in-use detection
Extension pick-up detection
Remote hang-up detection
The telephony extension features are enabled through the -STE command. The -TTE
command can be used to adjust the voltage thresholds for the telephony extension
features.
2.9.1 Line-in-Use Detection
The line-in-use detection feature can stop the modem from disturbing the phone line
when the line is already being used. When an attempt is made to dial using ATDT and the
phone line is in use, the modem will not go off hook and will respond with the message
“LINE IN USE”.
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2.9.2 Extension Pick-up Detection
The extension pick-up detection feature (also commonly referred as PPD or Parallel
phone detection) allows the modem to detect when another telephony device (i.e., fax
machine, phone, satellite/cable box) is attempting to use the phone line. When an
extension pick-up has been detected, the modem will go on-hook and respond with the
message “OFF-HOOK INTRUSION”.
This feature can be used to quickly drop a modem connection in the event when a user
picks up an extension phone line. For example, this feature allows set top boxes with an
integrated CSM92-SP modem to give normal voice users the highest priority over the
telephone line.
2.9.3 Remote Hang-up Detection
The remote hang-up detection feature will cause the modem to go back on-hook and
respond with the message “LINE REVERSAL DETECTED” during a data connection
when the remote modem is disconnected for abnormal termination reasons (remote phone
line unplugged, remote server/modem shutdown).
2.10 Point-of-Sales Support
Point-of-Sales (POS) terminals usually need to exchange a small amount of data in the
shortest amount of time. Low speed modulations such as Bell212A or V.22 are still
mainly used in POS applications. Additionally, new non-standard sequences have been
developed to better support POS applications.
Industry standard and shortened answer tone B103 and V.21 are supported, as well as
FastPOS (V.29) and V.22 FastConnect. POS terminal modulations are supported by the
$F command.
2.11 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation
Facsimile functions operate in response to fax class 1 commands when +FCLASS=1, to
fax class 1.0 commands when +FCLASS=1.0, or to fax class 2 commands when
+FCLASS=2.
In the fax mode, the on-line behavior of the modem is different from the data (non-fax)
mode. After dialing, modem operation is controlled by fax commands. Some AT
commands are still valid but may operate differently than in data modem mode.
Calling tone is generated in accordance with T.30.
2.12 Tone Detectors
The modem is equipped with three tone detectors with separate signal paths from the
main received signal path thus enabling tone detection to be independent of the
configuration status.
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2.13 Call Waiting Tone Detection
Call Waiting tones can be detected when in V.92, V.90, V.34, and V.32bis data modes.
2.14 Caller ID
Both Type I Caller ID (On-Hook Caller ID) and Type II Caller ID (Call Waiting Caller
ID) are supported for U.S. and many other countries (see Section 2.15). Both types of
Caller ID are enabled/disabled using the +VCID command. Call Waiting Tone detection
must be enabled using the +PCW command to detect and decode Call Waiting Caller ID.
When enabled, caller ID information (date, time, caller code, and name) can be passed to
the DTE in formatted or unformatted form. Inquiry support allows the current caller ID
mode and mode capabilities of the modem to be retrieved from the modem.
Type II Caller ID (Call Waiting Caller ID) detection operates only during data mode in
V.92, V.90, V.34, V.32bis, or V.32.
2.15 Worldwide Country Support
Internal modem firmware supports 63 country profiles (see Table 1-2). These country
profiles include the following country-dependent parameters:
Dial tone detection levels and frequency ranges.
DTMF dialing parameters: Transmit output level, DTMF signal duration, and DTMF
interdigit interval.
Pulse dialing parameters: Make/break times, set/clear times, and dial codes are
programmable.
Ring detection frequency range.
Type I and Type II Caller ID detection are supported for many countries. Contact
your local Conexant sales office for additional country support.
Blind dialing enabled/disable.
Carrier transmit level. The maximum, minimum, and default values can be defined to
match specific country and DAA requirements.
Calling tone is generated in accordance with V.25. Calling tone may be toggled
(enabled/disabled) by inclusion of a “^” character in a dial string. It may also be
disabled.
Frequency and cadence of tones for busy, ringback, congested, warble, dial tone 1,
and dial tone 2.
Answer tone detection period.
Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to
the same number when previous call attempts have failed. Call failure can be
detected for reasons such as no dial tone, number busy, no answer, no ringback
detected, voice (rather than modem) detected, and key abort (dial attempt aborted by
user). Actions resulting from such failures can include specification of minimum
inter-call delay, extended delay between calls, and maximum numbers of retries
before the number is permanently forbidden ("blacklisted").
The country profiles may be altered or customized by modifying the country-dependent
parameters. Additional profiles may also be included. Additional and modified country
profiles are supported by internal SRAM.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 2-11
Please contact an FAE at the local Conexant sales office for additional and modified
country profile support.
2.16 Diagnostics
Diagnostics are performed in response to test commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem,
which loops the data back to the local DTE.
PTT Signal Generation (%TTn Command). Continuous tones or modulation are
generated by the DSP and output through the DAA.
2.17 Low Power Modes
The modem enters a low power mode when no line connection exists and no host activity
occurs for the period of time specified in the S24 register. The modem supports four low
power modes: Idle Mode, Sleep Mode, Deep Sleep Mode, and Stop Mode. The low
power mode entered depends on the setting of the –SLP command.
2.17.1 Idle Mode
In Idle mode, the CPU and SPX clocks stop, and the SSD clock runs at low frequency.
The modem can detect and qualify ring signals and process AT commands. The modem
returns to normal mode upon receiving an AT command or receiving a qualified ring.
2.17.2 Sleep Mode
In Sleep mode, the SPX clock stops, and the CPU and SSD clocks run at low frequency.
The modem can detect and qualify ring signals. The modem cannot process AT
commands. The modem can be awakened by the host sending a single (any) character
(typically followed by an AT command) or by the modem receiving a qualified ring.
2.17.3 Deep Sleep Mode
In Deep Sleep mode, the SPX and SSD clocks stop, and the CPU clock runs at low
frequency. The modem can detect and qualify ring signals. The modem cannot process
AT commands. The modem can be awakened by the host sending a single (any) character
(typically followed by an AT command) or by the modem receiving a qualified ring.
2.17.4 Stop Mode
In Stop mode, the CPU, SPX and SSD clocks stop. The modem cannot process AT
commands and cannot detect and qualify ring signals. The modem can be awakened by
the host sending a single (any) character (typically followed by an AT command).
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
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CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-1
3. Hardware Interface
3.1 CX93021-2x Modem Hardware Interface Signals
3.1.1 CX93021-2x Modem Interface Signal Summary
3.1.1.1 LSD Interface (Through DIB)
The DIB interface signals are:
DIBP
DIBN
3.1.1.2 Call Progress Speaker Interface
The call progress speaker interface signal is:
Digital speaker output (DSPKOUT); output
3.1.1.3 Clock Select Interface
The clock select interface signal is:
Clock Select (CLKSEL); input
3.1.1.4 Serial EEPROM Interface
The 2-line serial interface signals to an optional serial EEPROM are:
Bidirectional Data input/output (NVMDATA)
Clock output (NVMCLK)
3.1.1.5 Serial DTE Interface and Indicator Outputs
The supported DTE interface signals are:
Serial Transmit Data input (TXD#)
Serial Receive Data output line (RXD#)
Clear to Send output (CTS#)
Received Line Signal Detector output (RLSD#)
Ring Indicator output (RI#)
Data Terminal Ready control input (DTR#)
Request to Send control input (RTS#)
Data Set Ready output (DSR#)
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3-2 2012 Conexant Systems, Inc. DSH-201722F
3.1.1.6 CX20452 Codec Interfaces
The supported codec interface signals are:
Codec Clock output (IACLK).
Codec Sleep Control output (IASLEEP).
Codec Receive Data Serial input (SRIN).
Codec Transmit Data Serial output (SROUT).
Codec Shift Clock input (SRCLK).
Codec Strobe input (SACLK).
Codec Control output (SRCTL).
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-3
3.1.2 CX93021-2x Modem Pin Assignments and Signal Definitions
CX93021-2x Modem hardware interface signals are shown by major interface in
Figure 3-1, are shown by pin number in Figure 3-2, and are listed by pin number in
Table 3-1.
CX93021-2x Modem hardware interface signals are defined in Table 3-2.
Figure 3-1. CX93021-2x Modem Hardware Interface Signals
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-4 2012 Conexant Systems, Inc. DSH-201722F
Figure 3-2. CX93021-2x Modem 36-Pin QFN Pin Signals
CX93021-2x
TXD#
RESERVED
VCC
VDD
IACLK
IASLEEP
NVMCLK/CLKSEL
RTS#
RESERVED
1
2
3
4
5
6
7
8
9
DSR#
CTS#
RESERVED
RESERVED
DTR#
MK4
RLSD#
RI#
RESERVED
10
11
12
13
14
15
16
17
18
RESERVED
RXD#
RESET#
XTLO
XTLI
DSPKOUT
SRCTL
SACLK
SRCLK
36
35
34
33
32
31
30
29
28
VDD_CORE
LPO
VDD
VCC
NVMDATA
SRIN
SROUT
DIBP
DIBN
27
26
25
24
23
22
21
20
19
GND (PADDLE), referred to as pin 37, is the connective surface located on
the bottom of the package.
Table 3-1. CX93021-2x Modem 36-Pin QFN Pin Signals
Pin No.
Signal Name
Pin No.
Signal Name
37
GND (PADDLE)
1
TXD#
19
DIBN
2
RESERVED
20
DIBP
3
VCC
21
SROUT
4
VDD
22
SRIN
5
IACLK
23
NVMDATA
6
IASLEEP
24
VCC
7
NVMCLK/CLKSEL
25
VDD
8
RTS#
26
LPO
9
RESERVED
27
VDD_CORE
10
DSR#
28
SRCLK
11
CTS#
29
SACLK
12
RESERVED
30
SRCTL
13
RESERVED
31
DSPKOUT
14
DTR#
32
XTLI
15
MK4
33
XTLO
16
RLSD#
34
RESET#
17
RI#
35
RXD#
18
RESERVED
36
RESERVED
Note: Pin 37 is the paddle on the bottom of the package.
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Table 3-2. CX93021-2x Modem Hardware Signal Definitions
Label
Pin
I/O
I/O
Type
Signal Name/Description
System
XTLI
XTLO
32
33
I
O
Ix
Ox
Crystal In and Crystal Out. If an external 27 or 28.224 MHz crystal
circuit is used instead of an external clock circuit, connect XTLI and
XTLO to the external crystal circuit. When an external clock circuit is
used, connect the clock signal to XTLI and leave XTLO open. (See
CLKSEL pin description.)
NVMCLK/CLKSEL
7
I
Ipu/O2
Clock Frequency Select (CLKSEL). Clock frequency is selected by
CLKSEL during reset processing. Leave open for 28.224 MHz operation;
connect pin to digital ground (GND) through 10 k for 27.000 MHz
operation.
This signal is multiplexed with NVMCLK.
RESET#
34
I
Ipu/O2
Reset. The active low RESET# input resets the modem logic and clears
the internal SRAM. RESET# low holds the modem in the reset state;
RESET# going high releases the modem from the reset state. During
application of VDD, RESET# must be held low before VDD power is
applied and for at least 15 ms after VDD reaches operating range. The
modem device set is ready to use 25 ms after the low-to-high transition
of RESET#.
Since some application may use external host GPIO to control RESET#
signal, it will be necessary to have an external 20 k pull-down resistor
on RESET# to ensure signal is low while applying VDD to the system.
LPO
26
I
Low Power Oscillator. Connect to +3.3V through 240 k.
VDD_CORE
27
O
PWR
+1.2V Internal Core Voltage Filter. Internal +1.2 V core voltage for
decoupling. Do not connect this pin to an external +1.2 V power supply.
VDD
4, 25
O
PWR
+3.3V I/O Circuits Voltage. Internal +3.3V I/O circuits voltage for
decoupling. Do not connect this pin to an external +3.3 V power supply.
VCC
3, 24
I
PWR
Digital Supply Voltage. Connect to +5V.
GND (PADDLE)
37
I
GND
Digital Ground. Connect to digital ground (GND).
MK4
15
I
Control. Connect to digital ground (GND).
Speaker Interface
DSPKOUT
31
O
Ipd/O2
Modem Speaker Digital Output. The DSPKOUT digital output reflects
the received analog input signal digitized to TTL high or low level by an
internal comparator.
DIB Interface
DIBN
19
O
Odpc
DIB Negative. Provides clock and power to the LSD, and transfers data,
control and status information between the SSD and LSD. Connect to
DIB transformer primary winding terminal.
DIBP
20
O
Odpc
DIB Positive. Provides clock and power to the LSD and transfers data,
control and status information between the SSD and LSD. Connect to
DIB transformer primary winding terminal.
NVRAM Interface
NVMCLK/CLKSEL
7
I/O
Ipu/O2
NVRAM Clock (NVMCLK). During normal operation, NVMCLK/CLKSEL
output high enables the EEPROM. Connect to EEPROM SCL pin.
This signal is multiplexed with CLKSEL.
NVMDATA
23
I/O
Ipu/O2
NVRAM Data. The NVMDATA pin supplies a serial data interface to the
EEPROM. Connect to EEPROM SDA pin and to +3.3V through 10 K.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-6 2012 Conexant Systems, Inc. DSH-201722F
Table 3-2. CX93021-2x Modem Hardware Signal Definitions (Continued)
Label
Pin
I/O
I/O
Type
Signal Name/Description
V.24 (EIA/TIA-232-E) DTE Serial Interface
TXD#
1
I
Ipu/O2
Transmitted Data (EIA BA/ITU-T CT103). The DTE uses the TXD# line
to send data to the modem for transmission over the telephone line or to
transmit commands to the modem.
RXD#
35
O
Ipu/O2
Received Data (EIA BB/ITU-T CT104). The modem uses the RXD# line
to send data received from the telephone line to the DTE and to send
modem responses to the DTE. During command mode, RXD# data
represents the modem responses to the DTE.
CTS#
11
O
Ipu/O2
Clear To Send (EIA CB/ITU-T CT106). CTS# output ON (low) indicates
that the modem is ready to accept data from the DTE. In error correction
or normal mode, CTS# is always ON (low) unless RTS/CTS flow control
is selected by the &Kn command.
RLSD#
16
O
Ipu/O2
Received Line Signal Detector (EIA CF/ITU-T CT109). During normal
operation, when AT&C0 command is not in effect, RLSD# output is ON
when a carrier is detected on the telephone line or OFF when carrier is
not detected.
RI#
17
O
Ipu/O2
Ring Indicator (EIA CE/ITU-T CT125). RI# output ON (low) indicates the
presence of an ON segment of a ring signal on the telephone line.
DTR#
14
I
Ipu/O2
Data Terminal Ready (EIA CD/ITU-T CT108). The DTR# input is turned
ON (low) by the DTE when the DTE is ready to transmit or receive data.
DTR# ON prepares the modem to be connected to the telephone line,
and maintains the connection established by the DTE (manual
answering) or internally (automatic answering). DTR# OFF places the
modem in the disconnect state under control of the &Dn and &Qn
commands.
RTS#
8
I
Ipu/O2
Request To Send (EIA CA/ITU-T CT105). RTS# input ON (low)
indicates that the DTE is ready to send data to the modem. In the
command state, the modem ignores RTS#.
The modem ignores RTS# unless RTS/CTS flow control is selected by
the &Kn command.
DSR#
10
O
Ipu/O2
Data Set Ready (EIA CC/ITU-T CT107). DSR# indicates modem status
to the DTE. DSR# OFF (high) indicates that the DTE is to disregard all
signals appearing on the interchange circuits except Ring Indicator (RI#).
DSR# output is controlled by the AT&Sn command.
CX20452 Codec Interface for Speakerphone
IACLK
5
O
It/Ot2
Codec Clock. Connect to CX20452 CLKIN pin.
IASLEEP
6
O
Ot2
Codec Sleep Control. Connect to CX20452 SLEEP pin.
SRIN
22
I
Itk/Ot2
Codec Receive Serial Data. Connect to CX20452 RXOUT pin.
SROUT
21
O
Ot2
Codec Transmit Serial Data. Connect to CX20452 TXSIN pin.
SRCLK
28
I
Itpu/Ot2
Codec Shift Clock. Connect to CX20452 SCK pin.
SACLK
29
I
Itpu/Ot2
Codec Strobe. Connect to CX20452 STROBE pin.
SRCTL
30
O
It/Ot2
Codec Control. Connect to CX20452 CNTRL_SIN pin.
Reserved
RESERVED
2, 9, 12, 13,
18, 36
Reserved. Leave open.
Note:
I/O Types: See Table 3-3.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-7
3.1.3 CX93021-2x Modem Electrical Characteristics
CX93021-2x I/O types are defined in Table 3-3.
CX93021-2x DC electrical characteristics are listed in Table 3-4.
Table 3-3. CX93021-2x Modem I/O Type Definitions
I/O Type
Description
Idd/Odd
Digital input/output, DIB data transceiver
Ix/Ox
I/O, wire
Ipd/O2
Digital input, 120 k pull-down / Digital output, 2 mA
Ipu/O2
Digital input, 120 k pull-up / Digital output, 2 mA
Ippu/O2
Digital input, Programmable 120 k pull-up / Digital output, 2 mA
Odpc
Digital output with adjustable drive, DIB clock and power
Rx
Oscillator Pad, place 120 k resistor from pad to VDD
PWR
Power
GND
Ground
NOTES:
1. See DC characteristics in Table 3-4.
2. I/O Type corresponds to the device Pad Type. The I/O column in signal interface tables refers to signal I/O direction used in
the application.
Table 3-4. CX93021-2x Modem DC Electrical Characteristics
Parameter
Symbol
Min.
Max.
Units
Test Conditions
Input Voltage Low
VIL
0
0.3 *VDD
V
Input Voltage High
VIH
0.7 * VDD
VDD
V
Input Current (no Pull-Down
or Pull-Up)
IIL
-1
+1
uA
OEN = 1
Input Current (Pull-Down)
IPD
+6
+30
uA
VIN = VDD
Input Current (Pull-Up)
IPU
-300
-60
uA
VIN = GND
Output Voltage Low
VOL
0
0.4
V
IOL = +2 mA
Output Voltage High
VOH
VDD-0.4
VDD
V
IOL = -2 mA
Output Impedance
Z
25
95
Pull-Up Resistance
Rpu
120
500
k
VIN = GND
Pull-Down Resistance
Rpd
120
500
k
VIN = VDD
Test Conditions unless otherwise stated: VCC = +5 ± 0.25 VDC; TA = 0°C to 70°C; external load = 50 pF.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
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3.2 CX20548 LSD Hardware Pins and Signals
3.2.1 General
3.2.1.1 Host Side Device (HSD) Interface (Through DIB)
The DIB interface signals are:
DIB Positive (DIBP, pin 14); input/output
DIB Negative (DIBN, pin 16); input/output
3.2.1.2 Power and Ground
The power and ground signals are:
Unregulated Power Output (PWR, pin 15)
Regulated Digital Power Output (DVDD, pin 1)
Regulated Analog Power Output (AVDD, pin 2)
Analog Ground (PADDLE [AGND]); Analog ground
3.2.1.3 Telephone Line Interface
The telephone line interface signals are:
RING AC Coupled (RAC, pin 4); input
TIP AC Coupled (TAC, pin 5); input
Electronic Inductor Capacitor (EIC, pin 11)
Electronic Inductor Output (EIO, pin 10)
Electronic Inductor Feedback (EIF, pin 9)
Receive Analog Input (RXI, pin 6); input
Transmit Output (TXO, pin 8); output
Transmit Feedback (TXF, pin 7); input
3.2.1.4 Voltage References
There is one reference voltage pin:
Output Middle (Center) Reference Voltage (VC, pin 3); output for decoupling
3.2.1.5 General Purpose Input/Output
There is one unassigned general purpose input/output pin:
General Purpose Input/Output (GPIO, pin 13); input/output
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-9
3.2.2 Pin Assignments and Signal Definitions
CX20548 LSD hardware interface signals are shown by major interface in Figure 3-3, are
shown by pin number in Figure 3-4, and are listed by pin number in Table 3-5.
Note: Pin 17 is shown in Figure 3-3 to ensure that the PADDLE is considered when
laying out the printed circuit board. The PADDLE is the analog ground pin of
the CX20548 device and must be connected to LSD analog ground
(AGND_LSD) when the CX20548 is populated in a PCB.
CX20548 LSD hardware interface signals are defined in Table 3-6.
CX20548 LSD GPIO DC characteristics are specified in Table 3-7.
CX20548 LSD AVDD DC characteristics are specified in Table 3-8.
Figure 3-3. CX20548 LSD Hardware Interface Signals
RAC
TAC
EIC
EIO
EIF
RXI
TXO
TXF
VC
GPIO
4
5
11
10
9
6
8
7
3
13
CX20548
SmartDAA 4
Line Side
Device
(LSD)
16-Pin QFN
Electronic
Inductor, Off-
Hook, Pulse
Dial, and TIP
and RING VI
Control
AGND_LSD
Safety
and EMI
Protection
AGND_LSD
C844
Receive
Coupling
Impedance
Matching
and
Transmitter
NC
DIBN
DIBP
TEST
DVDD
PWR+
AVDD
PADDLE (AGND)
16
14
2
1
15
2
17
C828
AGND_LSD
DIGITAL
ISOLATION
BARRIER
(DIB)
DIBN
DIBP
Telephone
Line
Connector TIP
RING
C852
C850
NOTES:
1. Consult applicable reference design for exact component
placement and values, and for layout guidelines.
2. The PADDLE (indicated as Pin 17) is the analog ground pin of the
CX20548 device and must be connected to LSD analog ground (AGND_LSD)
when the CX20548 is populated in a printed circuit board (PCB).
C862
C870
AGND_LSD
AGND_LSD
R802
R804
R854
AGND_LSD
C830
T802
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-10 2012 Conexant Systems, Inc. DSH-201722F
Figure 3-4. CX20548 LSD 16-Pin QFN Pin Signals
CX20548
1
2
3
4
DVDD
AVDD
VC
RAC
TAC
RXI
TXF
TXO
TEST
EIC
EIO
EIF
DIBN
PWR
DIBP
GPIO
12
11
10
9
5
6
7
8
16
15
14
13
The PADDLE, a connective surface located on the bottom
of the package and referred to as pin 17, is connected
internally to analog ground (AGND).
Table 3-5. CX20548 LSD 16-Pin QFN Pin Signals
Pin
Signal Label
Pin
Signal Label
1
DVDD
9
EIF
2
AVDD
10
EIO
3
VC
11
EIC
4
RAC
12
TEST
5
TAC
13
GPIO
6
RXI
14
DIBP
7
TXF
15
PWR
8
TXO
16
DIBN
17
PADDLE (AGND)
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-11
Table 3-6. CX20548 LSD Hardware Signal Definitions
Label
Pin
I/O
I/O Type
Signal Name/Description
System Interface Signals
PWR
15
PWR
PWR
Unregulated Power Output. Unregulated power output from the internal
rectifier, connect to AGND_LSD through C870.
VC
3
REF
REF
Output Middle Reference Voltage. Connect to AGND_LSD through
C844, which must be placed close to pin 3. Use a short path and a wide
trace to AGND_LSD pin.
AVDD
2
PWR
PWR
Analog Power Output. Provides external connection point for
decoupling. (AVDD is routed internally to LSD analog circuits.). Connect
to AGND_LSD through C828. C828 must be placed close to pins 2.
DVDD
1
PWR
PWR
Digital Power Output. Provides external connection point for
decoupling. Connect to AGND_LSD through C830. Place C830 near
pin 1.
PADDLE
(AGND)
17
AGND_LSD
AGND_LSD
Paddle Analog Ground. The conductive surface located on the bottom
of the package and referred to as pin 17 is connected internally to device
analog ground. Connect to AGND_LSD.
DIB Interface Signals
DIBP
14
I/O
I/O
DIB Positive. Positive terminal of DIB, connect to secondary of DIB
transformer.
DIBN
16
I/O
I/O
DIB Negative. Negative terminal of DIB, connect to secondary of DIB
transformer.
TIP and RING Interface Signals
RAC
TAC
4
5
I
I
Ia
a
RING AC Coupled and TIP AC Coupled. Un-rectified voltage from
telephone line used to detect ring.
Connect RAC to the diode bridge AC node (RING) through R802
(connects to pin 4).
Connect TAC to the diode bridge AC node (TIP) through R804 (connects
to pin 5).
EIC
11
O
Oa
Electronic Inductor Capacitor. Electronic inductor filtering capacitor.
Connect to AGND_LSD through C858.
EIO
10
O
Oa
Electronic Inductor Output. Calculated voltage is applied to this output
to control off-hook and DC VI mask operation. Connect to base of Q804.
EIF
9
I
Ia
Electronic Inductor Feedback. Connect to emitter of Q804 through
R826.
RXI
6
I
Ia
Receive Analog Input. Receiver operational amplifier inverting input.
AC coupled to the Bridge_CC node through R810 (connects to pin 6)
and C810 in series. R810 and C810 must be placed very close to pin 6.
The length of the PCB trace connecting R810 to the RXI pin must be
kept at an absolute minimum.
TXO
8
O
Oa
Transmit Output. Outputs transmit signal and impedance matching
signal; connect to base of transistor Q802.
TXF
7
I
Ia
Transmit Feedback. Connect to emitter of transistor Q802.
Not Used
GPIO
1
I/O
It/Ot12
General Purpose I/O. Leave open if not used.
Notes:
1. I/O types*:
Ia Analog input
It Digital input*
Oa Analog output
Ot12 Digital output*
AGND_LSD Isolated LSD Analog Ground (isolated from the host system ground)
*See Section CX20548 LSD GPIO DC Electrical Characteristics (Table 3-7).
2. Refer to applicable reference design for exact component placement and values.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-12 2012 Conexant Systems, Inc. DSH-201722F
Table 3-7. CX20548 LSD GPIO DC Electrical Characteristics
Parameter
Symbol
Min.
Typ.
Max.
Units
Test Conditions
Input Voltage
VIN
-0.30
–
3.465
V
DVDD = +3.465V
Input Voltage Low
VIL
–
–
1.0
V
Input Voltage High
VIH
1.6
–
–
V
Output Voltage Low
VOL
0
–
0.33
V
Output Voltage High
VOH
2.97
–
–
V
Input Leakage Current
–
-10
–
10
µA
Output Leakage Current (High Impedance)
–
-10
–
10
µA
GPIO Output Sink Current at 0.33 V maximum
–
2.4
–
-
mA
GPIO Output Source Current at 2.97 V
minimum
–
2.4
–
-
mA
GPIO Rise Time/Fall Time
20
100
ns
Test Conditions unless otherwise stated: DVDD = +3.3V +5%; TA = 0°C to 70°C; external load = 50 pF
Table 3-8. CX20548 LSD AVDD and DVDD DC Electrical Characteristics
PWR Input
AVDD Output
DVDD Output
+3.3 V < PWR < +4.5 V
+3.3 V 5%
+3.0 V 5%
PWR must be at least 100mV higher than AVDD.
See PWR, AVDD, and DVDD descriptions in Table 3-6.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-13
3.3 CX20452 Codec Hardware Interface Signals
3.3.1 CX20452 Codec Pin Assignments and Signal Definitions
The CX20452 Codec hardware interface signals for a typical speakerphone application
are shown in Figure 3-5.
The CX20452 Codec pin assignments are shown in Figure 3-6 and are listed in Table 3-9.
The CX20452 Codec hardware interface signals are described in Table 3-10.
Figure 3-5. CX20452 Codec Hardware Interface Signals
NC
NC
NC
NC
NC
+
+
+
+
A
GN
D
DGND
DGND
+3.3 V
C9
.1 µF
CX20452
Codec
12
20
4
3
15
14
22
19
2
23
5
9
8
11
10
17
18
16
6
7
13
21
1
24
VDD
VDD
A
VD
D
POR
TXSIN
CLKIN
VSS
REL
A
Y
A
SPKR_OUT
D_LPBK_BAR
A
VS
S
VC
VREF
LINE_IN
MIC_IN
RXOUT
ST
R
OB
E
SCK
LINE_OUTP
LINE_OUTM
CNTRL_SIN
VSUB
SLEEP
NC
S
R
OU
T
RESET#
CX93021-2x
Modem
SRIN
C17
10 µF
C10
10 µF
DGND
SRCTL
A
GN
D
C13
10 µF
SRCLK
C16
.1 µF
C18
.1 µF
C7
10 µF
S
A
CL
K
C14
.1 µF
L1
10 uH
I
A
CL
K
A
GN
D
C8
.1 µF
0.1 µF
1 µF
R11
100 K
IASLEEP
+3.3 V
NC
21
5
17
29
28
30
6
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-14 2012 Conexant Systems, Inc. DSH-201722F
Figure 3-6. CX20452 Codec 24-Pin QFN Pin Signals
CX20452
STROBE
RXOUT
SCK
TXSIN
CLKIN
CNTRL_SIN
18
17
16
15
14
13
SLEEP
SPKR_OUT
POR
AVDD
AVSS
LINE_OUTP
1
2
3
4
5
6
LINE_OUTM
VREF
VC
MIC_IN
LINE_IN
VDD
7
8
9
10
11
12
NC
D_LPBK_BAR
VSS
VSUB
VDD
RELAYA
24
23
22
21
20
19
Table 3-9. CX20452 Codec 24-Pin QFN Pin Signals
Pin No.
Signal Name
Pin No.
Signal Name
1
SLEEP
13
CNTRL_SIN
2
SPKR_OUT
14
CLKIN
3
POR
15
TXSIN
4
AVDD
16
SCK
5
AVSS
17
RXOUT
6
LINE_OUTP
18
STROBE
7
LINE_OUTM
19
RELAYA
8
VREF
20
VDD
9
VC
21
VSUB
10
MIC_IN
22
VSS
11
LINE_IN
23
D_LPBK_BAR
12
VDD
24
NC
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-15
Table 3-10. CX20452 Codec Hardware Signal Definitions
Signal Name
Pin No.
I/O
Type
Signal Description
Power and Ground
VDD
12, 20
PWR
Digital Power Supply. Connect to 3.3 V and to digital circuits power supply filter.
AVDD
4
PWR
Analog Power Supply. Connect to 3.3 V and to analog circuits power supply filter.
VSS
22
GND
Digital Ground. Connect to GND.
AVSS
5
AGND
Analog Ground. Connect to AGND.
Control
POR
3
IPU
Power-On Reset In. Active low reset input. Connect to reset circuit and to
CX93021-2x RESET# pin.
D_LPBK_BAR
23
IPU
Digital Loopback Control. Active low input asserted to loopback DAC to SINC.
Used for factory test only. Leave open for normal operation.
CX93021-2x Interface
CLKIN
14
IPD
Clock Input. Connect to CX93021-2x IACLK pin.
SLEEP
1
IPD
Sleep Control Input. Active low input asserted to power down the CX20452 Codec.
CX93021-2x IASLEEP pin.
RXOUT
17
O
Receive Data Serial Output. Connect to CX93021-2x SRIN pin.
TXSIN
15
IPD
Transmit Data Serial Input. Connect to CX93021-2x SROUT pin.
SCK
16
O
Shift Clock Output. Connect to CX93021-2x SRCLK pin.
STROBE
18
O
Strobe Output. Connect to CX93021-2x SACLK pin.
CNTRL_SIN
13
IPD
Control Input. Connect to CX93021-2x SRCTL pin.
Microphone and Speaker Interface
MIC_IN
10
IA
Microphone Input. Single-ended analog data input from the microphone circuit.
SPKR_OUT
2
OA
Analog Speaker Output. The SPKR_OUT analog output reflects the selected
analog signal. When the speaker is turned off, SPKR_OUT is clamped to the
voltage at the VC pin. The SPKR_OUT output can drive an impedance as low as
150 .
Line Interface (Not Used)
RELAYA
19
OD
Relay A Control. Leave open.
LINE_OUTP
6
OA
Line Output Plus. Single-ended analog data output. Leave open.
LINE_OUTM
7
OA
Line Output Minus. Single-ended analog data output. Leave open.
LINE_IN
11
IA
Line Input. Single-ended analog data input. Leave open.
Reference
VREF
8
OA
Analog Reference Voltage. 0. 5 V nom. Connect to AGND through 10 µF
(polarized, + terminal to VREF) and 0.1 µF (ceramic) in parallel. Position these
capacitors very close to the VREF pin. Use a short path and a wide trace to AGND
pin.
VC
9
OA
Analog Reference Voltage. 1.5 V nom. Connect to AGND through 10 µF
(polarized, + terminal to VC) and 0.1 µF (ceramic) in parallel. Position these
capacitors very close to the VC pin. Use a short path and a wide trace to AGND pin.
VSUB
21
GND
Digital Substrate Pin. Connect to AGND.
No Connect
NC
24
—
No Internal Connection. Leave open.
Notes:
1. I/O types*:
I Digital Input: CMOS receiver, IPD = 130 k pull-down, IPU = 130 k pull-up
O Digital Output: CMOS driver, 2 mA, 120
OD Digital Output: CMOS driver, open drain
IA Analog Input: Analog receiver
OA Analog Output: Analog driver
PWR Power
AGND Analog ground
GND Digital ground
*See DC Electrical Characteristics (Table 3-11) and Analog Electrical Characteristics (Table 3-12).
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-16 2012 Conexant Systems, Inc. DSH-201722F
3.3.2 CX20452 Codec Electrical Characteristics
CX20452 Codec DC electrical characteristics are listed in Table 3-11.
CX20452 Codec analog electrical characteristics are listed in Table 3-12.
Table 3-11. CX20452 Codec DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
Input high voltage
VIH
0.4 * VDD
VDD + 0.3
V
Input low voltage
VIL
-0.3
0.2 * VDD
V
Output high voltage
VOH
0.8 * VDD
VDD
V
Output low voltage
VOL
—
0.4
V
Input leakage current
IIN
—
±10
A
Output leakage current
IOUT
—
±10
A
Notes:
Applies to types I and O unless otherwise indicated.
All voltages referenced to ground (VSS). Currents are positive when flowing into the device.
Table 3-12. CX20452 Codec Analog Electrical Characteristics
Parameter
Symbol
Min.
Typ.
Max.
Unit
DAC to Line Driver output at -10 dBm, 600
SNR
—
72
—
dB
DAC to Speaker Driver output at -10 dBm, 150
SNR
—
72
—
dB
Line input to ADC at –10 dBm
SNR
—
80
—
dB
Input leakage current
IIN
—
—
10
A
Output leakage current
IOUT
—
—
10
A
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-17
3.4 Operating Conditions, Absolute Maximum Ratings, and Power
Requirements
The CX93021-2x and CX20452 operating conditions are specified in Table 3-13.
The CX93021-2x and CX20452 absolute maximum ratings are listed in Table 3-14.
The CX93021-2x current and power requirements are listed in Table 3-15.
The CX20452 current and power requirements are listed in Table 3-16.
Table 3-13. CX93021-2x Modem and CX20452 Codec Operating Conditions
Parameter
Symbol
Limits
Units
CX93021-2x Supply Voltage
VCC
+4.75 to +5.25
VDC
CX20452 Digital Supply Voltage
VDD
+3.0 to +3.6
VDC
CX20452 Analog Supply Voltage
AVDD
+3.0 to +3.6
VDC
Operating Ambient Temperature
TA
0 to +70
°C
Note: Voltages referenced to ground (VSS).
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-18 2012 Conexant Systems, Inc. DSH-201722F
Table 3-14. Absolute Maximum Ratings
Parameter
Symbol
Limits
Units
Common
Storage Temperature Range
TSTG
-55 to +125
°C
Relative humidity
HREL
Up to 90% non-
condensing, or a wet
bulb temperature up to
35 °C, whichever is less.
CX93021-2x Modem
CX93021-2x VCC Supply Voltage
VCC
-0.5 to +6.0
VDC
Input Voltage
VIN
-0.5 to VDD + 0.5
VDC
Voltage Applied to Outputs in High
Impedance (Off) State
VHZ
-0.5 to +5.5
VDC
DC Input Clamp Current
IIK
±20
mA
DC Output Clamp Current
IOK
±20
mA
Static Discharge Voltage (25°C)
VESD
±2500
VDC
Latch-up Current (25°C)
ITRIG
±400
mA
CX20452 Codec
Analog Supply Voltage (+3.3 V operation)
AVDD
-0.3 to +4.6
V
Digital Supply Voltage (+3.3 V operation)
VDD
-0.3 to +4.6
V
Digital Input Voltage
VIN
–0.3 to (VDD + 0.3)
V
Analog Input Voltage
VIN
–0.3 to + (AVDD + 0.3)
V
DC Input Clamp Current
IIK
±10
mA
DC Output Clamp Current
IOK
±10
mA
Static Discharge Voltage (25°C)
VESD
±2500
V
Latch-up Current (25°C)
ITRIG
±150
mA
Handling CMOS Devices
The device contains circuitry to protect the inputs against damage due to high static
voltages. However, it is advised that normal precautions be taken to avoid application of
any voltage higher than maximum rated voltage.
An unterminated input can acquire unpredictable voltages through coupling with stray
capacitance and internal cross talk. Both power dissipation and device noise immunity
degrades. Therefore, all inputs should be connected to an appropriate supply voltage.
Input signals should never exceed the voltage range from -0.5V to (VDD + 0.5) V. This
prevents forward biasing the input protection diodes and possibly entering a latch up
mode due to high current transients.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 3-19
Table 3-15. CX93021-2x Current and Power Requirements
Mode
Typical
Current
(mA)
Maximum
Current
(mA)
Typical
Power
(mW)
Maximum
Power
(mW)
Normal Mode: On-hook, Idle, waiting for ring
75
85
375
446
Normal Mode: Off-hook, normal data connection
87
97
435
509
Idle Mode (-SLP=0)
16
23
80
120
Sleep Mode (-SLP=1)
16
23
80
120
Deep Sleep Mode (-SLP=2)
7
13
35
68
Stop Mode (-SLP=3)
5
11
25
58
Notes:
1. Test conditions: VCC = +5.0V for typical values; VCC = +5.25V for maximum values. Temperature = 25 oC.
2. Ptyp = Ityp * 5.0V; Pmax = Imax * 5.25V.
3. Input Ripple 0.1 Vpeak-peak.
Table 3-16. CX20452 Codec Current Requirements
Mode
Typical
Current
(Ityp)
Maximum
Current
(Imax)
Typical
Power
(Ptyp)
Maximum
Power
(Pmax)
VDD
Operating
0.5 mA
1.65 mW
Sleep
< 0.3 A
1 W
AVDD
Operating
2.7 mA
8.9 mW
Sleep
0.6 A
1.98 W
Notes:
1. Test conditions: VDD = AVDD = +3.3V for typical values; VDD = AVDD = +3.6V for maximum values.
2. Input Ripple 0.1 Vpeak-peak.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
3-20 2012 Conexant Systems, Inc. DSH-201722F
3.5 Crystal and Clock Specifications
Crystal specifications are listed in Table 3-17. Clock specifications are listed in
Table 3-18.
Table 3-17. Crystal Specifications
Characteristic
Value
Frequency
28.224 or 27.000 MHz nominal
Calibration Tolerance
±50 ppm at 25°C (CL = 16.5 and 19.5 pF)
Frequency Stability vs. Temperature
±35 ppm (0°C to 70°C)
Frequency Stability vs. Aging
±20 ppm/5 years
Oscillation Mode
Fundamental
Calibration Mode
Parallel resonant
Load Capacitance, CL
18 pF nom.
Shunt Capacitance, CO
7 pF max.
Series Resistance, R1
35-60 max. @20 nW drive level
Drive Level
100 µW correlation; 500 µW max.
Operating Temperature
0°C to 70°C
Storage Temperature
–40°C to 85°C
Table 3-18. Clock Specifications
Characteristic
Value
Type
Square wave
Frequency
28.224 or 27.000 MHz nominal
Level
3.3 Vp-p ± 0.3 V zero offset
Duty Cycle
50 ± 10 %
Stability
±50 ppm
.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 4-1
4. Package Dimensions
The 36-pin QFN package dimensions are shown in Figure 4-1.
The 24-pin QFN package dimensions are shown in Figure 4-2.
The CX93021-2x comes in a 16-pin QFN package, in either punch or sawn style. Both
are electrically equivalent and share the same footprint. Table 4-1 provides a dimension
table that is common to both QFN styles. The punch-style package is shown in
Figure 4-3, and the sawn-style package is shown in Figure 4-4.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
4-2 2012 Conexant Systems, Inc. DSH-201722F
Figure 4-1. Package Dimensions for 36-Pin QFN
0.13
0.24
0.00
E
P
R
0
E1
A3
A2
A1 -
D1
D
0.70
0.23
0.60
0.05
6.00 BSC
0.17
0.42
5.75 BSC
0.20 REF.
0.65
0.01
5.75 BSC
6.00 BSC
12°
11
MIN.
A-
S
B
M
Y
L
O
0.90
MAX.
0.85
NOM.
DIMENSIONS (mm)
T
NO
E
12
3
3
3
4
12
NOTES:
1. NOT APPLICABLE.
2. DIMENSIONING &TOLERANCES CONFORMTO ASME Y14.5M. -1994.
3. N IS THE NUMBER OF TERMINALS.
Nd IS THE NUMBER OF TERMINALS IN X-DIRECTION.
Ne IS THE NUMBER OF TERMINALS INY-DIRECTION.
4. DIMENSION b APPLIESTO PLATED TERMINAL AND IS MEASURED
BETWEEN 0.20 AND 0.25mm FROM TERMINAL TIP.
5. THE PIN #1 IDENTIFIER (INDENTATION MARK OROTHER FEATURE).
6. EXACT SHAPE AND SIZE OF THIS FEATURE IS OPTIONAL.
7. ALL DIMENSIONS ARE IN MILLIMETERS.
8. THE SHAPE SHOWN ON FOUR CORNERS ARE NOT ACTUAL I/O.
9. PACKAGEWARPAGE IS 0.05mm MAXIMUM.
10. APPLIED FOR EXPOSEDPAD AND TERMINALS. EXCLUDE EMBEDDING
PART OF EXPOSEDPAD FROM MEASURING.
11. APPLIED ONLY FOR TERMINALS.
12. Q AND R APPLIES ONLY FORSTRAIGHT TIEBAR SHAPES.
Nd 9
b0.18 0.23 0.30
0.50 BSC
e
L0.600.50 0.75
Ne 9
36
N
36-PIN 6x6mm QFN_(REF: 45278_PVC_EPVC)
POD_36QFN_6x6mm_PVC_EPVC (05-1499ill)
0.30
Q0.40 0.65
D2 3.95 4.10 4.25
E2 3.95 4.10 4.25
0.60 DIA.
D1/2
D1
D/2
D
E1/2 E/2
E1 E
2X
A
2X 0.10
B
C
A
36
SEATING
PLANE
36
5 6
3
2
b
e
1
0.05
B
C0.10
2X C0.10
0.10
2X B
L
4.0 REF.
4.0 REF.
A1
A
C
10
C
4X P
4X P
C
A
A3
A2
E2
E2/2
D2
D2/2 PIN#1 ID
R0.20
0.45
(MIN. 0.35)
(MIN. 0.35)
0
0.10 C
3
2
1
FOR PIN #1 ID AND
SEE DETAIL "A"
TIEBAR MARK OPTION
b
SCALE: NONE
TE RMINAL TIP
L
C
e
C
C
L
C
e
411
A1
0.05
0.10 M
MBA
C
C
13
4
TOP VIEW BOTTOM VIEW
SIDE VIEW
SECTION "C-C"
FOR ODD
TERMINAL/SIDE FOR EVEN
TERMINAL/SIDE
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 4-3
Figure 4-2. Package Dimensions for 24-Pin QFN
D 4.00 BSC
E
0
E1
D1
P
4.00 BSC
3.75 BSC
3.75 BSC
0.24 0.42 0.60
12°
N
Nd
b
L
Ne
AL
O
A3
A2
A1
e
S
Y
B
M
0.20 REF.
NOM.
0.50 BSC
0.18
0.30
6
24
0.23
0.40
6
-
-
0.00
MIN.
0.65
0.01
0.85
0.30
0.50
3
3
4
3
MAX.
0.70
0.05
0.90
TE
11
DIMENSIONS O
N
5. THE PIN #1 IDENTIFIER.
2. DIMENSIONING &TOLERANCES CONFORMTO ASME Y14.5M. - 1994.
1. NOT APPLICABLE.
10. APPLIED FOR EXPOSEDPAD AND TERMINALS.
9. PACKAGE WARPAGE MAX 0.05mm.
11. APPLIED ONLY FOR TERMINALS.
BETWEEN 0.20 AND 0.25mm FROM TERMINAL TIP.
Ne IS THE NUMBER OF TERMINALS INY-DIRECTION.
Nd IS THE NUMBER OF TERMINALS IN X-DIRECTION &
3. N IS THE NUMBER OF TERMINALS.
6. EXACT SHAPE AND SIZE OF THIS FEATURE IS OPTIONAL.
7. ALL DIMENSIONS ARE IN MILLIMETERS.
4. DIMENSION b APPLIESTO PLATED TERMINAL AND IS MEASURED D2
E2 2.50
2.35 2.65
2.35 2.65
2.50
PD_24QFN
NOTES:
8. THE SHAPES SHOWN ON FOUR CORNERS ARE NOT ACTUAL I/O.
0.50 DIA.
D1/2
D1
D/2
D
E1/2 E/2
E1 E
A
2X
0.10
B
C
0.10 BA
MC
A
N
SEATING
PLANE
N
5 6
3
22
3
b
e
11
0.05
C
2X
C0.10
0.10
2X
B
0
L
REF.
(Nd-1)Xe
(Ne-1)Xe
REF.
4
A1
4X P
A
C
10
C4X P
B
2X
AC0.10
A2 A3
D2 D2/2
E2
E2/2
PIN1 ID
0.45
0.20 R.
0.25 MIN.
0.25 MIN.
SIDE VIEW
TOP VIEW BOTTOM VIEW
4
L
C
CC
SCALE: NONE
bA1 11
e
SECTION "C-C"
TERMINAL TIP
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
4-4 2012 Conexant Systems, Inc. DSH-201722F
Table 4-1. Common Table for 16-QFN Punch and Sawn Style Package Dimensions
Dim.
Minimum
Nominal
Maximum
Note
e
0.65 BSC
L
0.5
0.75
b
0.21
0.35
(1)
D2
1.95
2.10
2.25
E2
1.95
2.10
2.25
A
0.8
1.00
A1
0.00
0.05
A3
0.20 REF.
D
4.00 BSC
D1
3.75 BSC
(2)
E
4.00 BSC
E1
3.75 BSC
(2)
General Notes:
1. All dimensions in mm.
2. Shape of Pin #1 indicator on the bottom of package can be different (i.e., Chamfer or Half
Circle).
Footnotes:
(1) Dimension b applies to plated terminal and is measured between 0.20 and 0.30 mm from
terminal tip.
(2) This dimension is applied only for Punched QFN.
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 4-5
Figure 4-3. Package Dimensions for 16-Pin QFN, Punch Style
Figure 4-4. Package Dimensions for 16-Pin QFN, Sawn Style
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 5-1
5. Recommended QFN Surface Mount Land Pattern
The recommended surface mount land patterns based on the IPC-SM-782 standard for
board layout are shown in Figure 5-1 for the 36-pin QFN, Figure 5-2 for the 24-pin QFN,
and Figure 5-3 for the 16-pin QFN.
Figure 5-1. Recommended Surface Mount Land Pattern for 36-Pin QFN
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
5-2 2012 Conexant Systems, Inc. DSH-201722F
Figure 5-2. Recommended Surface Mount Land Pattern for 24-Pin QFN
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
DSH-201722F 2012 Conexant Systems, Inc. 5-3
Figure 5-3. Recommended Surface Mount Land Pattern for 16-Pin QFN
CX93021-2x CSM92-SP V.92 Controllered Serial Modem with Speakerphone Data Sheet
5-4 2012 Conexant Systems, Inc. DSH-201722F
This page is intentionally blank.
NOTES
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