CM109 - C-Media Electronics, Inc.

Best High Integration/Low Cost USB Audio Controller

for PC Internet Phone

CM109 USB I/O Controller

DataSheet

Version 1.3a

C-MEDIA ELECTRONICS INC.

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiw an 106, R.O.C.

For detailed product information, please contact sales@cmedia.com.tw

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 1 -

NOTICES

THIS DOCUMENT IS PROVIDED “AS IS” WITH NO WARRANTIES WHAT SO EVER,

INCLUDING ANY WARRANTY OF MERCHANT ABILITY, NONINFRINGEMENT, FITNESS FOR

ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY

PROPOSAL, DOCUMENT OR SAMPLE.

TRANSMITTED IN ANY FORM OR BY ANY MEANS, ELECTRONIC OR MECHANICAL,

INCLUDING INFORMATION STORAGE AND RETRIEVAL SYSTEMS, WITHOUT

PERMISSION IN WRITING FROM C-MEDIA ELECTRONICS, INC.

COPYRIGHT

icons, images, audio clips, digital downloads, data compilations, and software, is either the

exclusive property of C-Media Electronics Inc., its affiliates (collectively, "C-Media"), its content

suppliers, or its licensors and protected by Republic of China and international copyright laws.

TRADEMARKS

C-Media, the C-Media Logo, Xear 3D, Xear 3D Logo, Speaker Shifter, Smart Jack, and Smart

Audio Jack are trademarks of C-Media Electronics Inc. in Republic of China and/or other

countries. All other brand and product names listed are trademarks or registered trademarks of

their respective holders and are hereby recognized as such.

*C-Media reserves the right to modify the specifications without further notice*

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 2 -

TABLE OF CONTENTS

1. DESCRIPTIONS AND OVERVIEW 4

2. FEATURES 4

3. PIN DESCRIPTIONS 6

3.1 PIN ASSIGNMENT BY PIN NUMBER 6

3.2 PIN-OUT DIAGRAM 6

3.3 PIN SIGNAL DESCRIPTIONS 7

4. MCU INTERFACE 9

5. BLOCK DIAGRAM 9

6. ORDERING INFORMATION 10

7. FUNCTION DESCRIPTIONS 11

7.1 USB INTERFACE 11

7.1.1 DEVICE DESCRIPTOR 11

7.1.2 CONFIGURATION DESCRIPTOR 12

7.1.3 CONTENT FORMAT FOR 94C46 12

7.1.4 USB AUDIO TOPOLOGY DIAGRAM 13

7.2 JUMPER PINS AND MODE SETTING 13

7.3 HID FEATURE 14

7.3.1 HID DESCRIPTOR 15

7.3.2 WINDOWS SOFTWARE ARCHITECTURE FOR HID 16

7.4 INTERNAL REGISTERS 16

7.4.1 ACCESS VIA HID CLASS COMMAND 16

7.4.2 ACCESS VIA ENTERNAL INTERFACE BY MCU 19

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 3 -

7.4.3 INDIRECT ACCESSED REGISTERS 22

7.5 MCU INTERFACE 23

7.6 BUZZER OUTPUT 28

8. ELECTRICAL CHARACTERISTICS 29

8.1 ABSOLUTE MAXIMUM RATING 29

8.2 OPERATION CONDITIONS 29

8.3 ELECTRICAL PARAMETERS 30

9. FREQUENCY RESPONSE GRAPHS 31

9.1 DIGITAL PLAYBACK FOR LINE OUTPUT FREQUENCY (10K OHM LOADING) 31

9.1.1 FREQUENCY RESPONSE 48KS/SEC 31

9.1.2 FREQUENCY RESPONSE 44.1KS/SEC 31

9.2 DIGITAL PLAYBACK FOR LINE OUTPUT FREQUENCY (32 OHM LOADING) 32

9.2.1 FREQUENCY RESPONSE 48KS/SEC 32

9.2.2 FREQUENCY RESPONSE 44.1KS/SEC 32

9.3 DIGITAL RECORDING FOR LINE OUTPUT FREQUENCY 33

9.3.1 FREQUENCY RESPONSE 48KS/SEC 33

9.3.2 FREQUENCY RESPONSE 44.1KS/SEC 33

10. APPLICATION CIRCUIT REFERENCE 34

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 4 -

1.DESCRIPTIONS AND OVERVIEW

CM109 is a highly integrated single chip USB audio controller specifically for VoIP (Voice

over internet protocol) application. All essential analog modules ar e embedded in CM109,

including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and

USB transceiver. 8 GPIO pins can constitute a 24 key matrix directly support keypad

control function without MCU. It’s also support buzzer output pin for VoIP application. In

addition, audio adjustment can be easily controlled via specific HID compliant volume

control pins. Many features are programmable with jumper pins or external EEPROM.

Vender can customized unique USB VID/PID to EEPROM for V o IP software authentication.

Moreover, individual unique phone number for each device is possible via serial number

stored in external EEPROM. Moreover, CM109 provided I2C interface with MCU

application for LCM integrated and advanced functions.

VoIP applications are becoming increasing popular as VoIP can provide free or low-cost

calling worldwide. To provide a Vo IP experience that is the same as using a regular phone

and eliminate the poor call quality that results from using the PC audio, C-Media has

developed CM109 USB Controller that enables a regular phone, handset, or headset

which is interfaced to the USB port on the PC. With the C-Media OEMs can quickly bring

to market a family of low cost high quality VoIP products.

2. FEATURES

z Compliant with USB 2.0 Full Speed Operation

z Compliant with USB Audio Devic e class specification v1.0

z Supports USB Suspend/Resume Mode and remote Wakeup with Volume Cont rol

pins

z Single 12MHz Crystal input with on-chip PLL and embedded USB transceiver

z Jumper Pin for Speaker Mode (Playback Only) or Headset Mode (Playback +

Recording)

z For Headset Mode, USB audio function topology has 2 Input Terminals, 2 Output

Terminals, 1 Mixer Unit, 1 Selector Unit, and 3 Feature Units

z Jumper Pin for Operation System Mixer Unit Enable/Disable under Headset Mode

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 5 -

z For Speak er Mode, USB audio function topology has 1 Input Terminal, 1 Output

Terminal, and 1 Feature Unit

z Support one Control Endpoint, one Isochroous out Endpoint, one Isochroous in

Endpoint, and one Interrupt in Endpoint

z Alternate zero bandwidth setting for releasing playback bandwidth on USB Bus

when this device is inactive

z Volume up, volume down, and playback mute support USB HID for Host Control

Synchronization

z Record Mute Pin with LED Indicator for Record Mute Status

z External EEPROM Interface for Vendor Specific USB VID, PID, and Serial

Number

z Supports AES/EBU, IEC60958, S/PDIF Consumer Formats for Stereo PCM

Data at S/PDIF Output

z 8 GPIO Pins with Read/Write via HID

z Embedded Buzzer Function controlled by Register

z Support I2C Interface for External MCU Integrated

z Jumper Pin for Output Voltage Swing (3.5V or 2.5V)

z Jumper Pin for Power Mode Setting

z Isochroous transfer uses Adaptive Mode with Internal PLL for Synchronization

z 48K/44.1KHz Sampling Rate for both Playback and Recording

z Soft Mute Function

z Embedded High Performance 16 bit audio DAC with Earphone Phone Buffer

z Host side data loss noise reduction function

z Embedded 16 bit ADC input with Microphone Boost

z Embedded power on Reset Block

z Embedded 5V to 3.3V regulator for single External 5V Operation

z Compatible with Win98 SE / Win ME / Win 2000 / Win XP and Mac OS9 / OS X

without Additional Driver

z 48 Pin LQFP Package

z Support Hardware SDK tool for third-party software or soft-phone development

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 6 -

3. PIN DESCRIPTIONS

3.1 PIN ASSIGNMENT BY PIN NUMBER

Pin # Si

g

nal Name Pin # Si

g

nal Name Pin # Si

g

nal Name Pin # Si

g

nal Name

1 SPDIFO 13 GPIO3 25 VBIAS 37 REGV

2 DW 14 DVSS1 26 VREF 38 MSEL

3 DR 15 GPIO4 27 MICIN 39 VOLUP

4 SK 16 GPIO5 28 VSEL 40 PDSW

5 CS 17 GPIO6 29 AVDD1 41 USBDP

6 MUTER 18 MUTEP 30 LOL 42 USBDM

7 PWRSEL 19 BUZZ 31 LOBS 43 GPIO1

8 XI 20 GPIO7 32 LOR 44 SCLK

9 XO 21 LEDR 33 AVSS2 45 MINT

10 MODE 22 GPIO8 34 AVDD2 46 SDAT

11 GPIO2 23 TEST 35 DVDD 47 MCLK

12 LEDO 24 AVSS1 36 DVSS2 48 VOLDN

3.2 PIN-OUT DIAGRAM

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 7 -

3.3 PIN SIGNAL DESCRIPTIONS

Pin # Symbol Type Description

1 SPDIFO DO, 8mA, SR SPDIF Output

2 DW DIO, 8mA,

PD, 5VT USB Controller Data Read From EEPROM Interface.

EEPROM Data Output.

3 DR DO, 4mA, SR

USB Controller Data Writes to EEPROM Interface.

EEPROM Data Input.

4 SK DO, 4mA, SR EEPROM Interface Clock (100KHz)

5 CS DO, 4mA, SR EEPROM Interface Chip Select

6 MUTER DI, ST, PU Mute Recording (Edge Trigger with de-Bouncing)

7 PWRSEL DI, ST

H: Pull Up to 3.3V; L: Pull Down to Ground

Speaker Mode H：Self Power with 100mA；L：Bus Power with 500mA

Headset Mode H：Bus Power with 100mA；L：Bus Power with 500mA

8 XI DI Input Pin for 12MHz Oscillator

9 XO DO Output Pin for 12MHz Oscillator

10 MODE DI, ST H: Pull Up to 3.3V; L: Pull Down to Ground

L：Headset Mode: Playback & Recording

H：Speaker Mode: Playback Only

11 GPIO2 DIO, 8mA,

PD, 5VT GPIO Pin

12 LEDO DO, SR, 8mA LED for Operation; Output H for Power On; Toggling for Data Transmit

13 GPIO3 DIO, 8mA,

PD, 5VT GPIO Pin

14 DVSS1 P Digital Grounding

15 GPIO4 DIO, 8mA,

PD, 5VT GPIO Pin

16 GPIO5 DIO, 8mA,

PD, 5VT GPIO Pin

17 GPIO6 DIO, 8mA,

PD, 5VT GPIO Pin

18 MUTEP DI, ST, PU Mute Playback (Edge Trigger with de-Bouncing)

19 BUZZ DO, 8mA, SR Buzzer Output Pin

20 GPIO7 DIO, 8mA,

PD, 5VT GPIO Pin

21 LEDR DO, SR, 8mA LED for Mute R ecor di n g In dicator; Output H when Recor din g is M ut e d

22 GPIO8 DIO, 8mA,

PD, 5VT GPIO Pin

23 TEST DI, ST, PD Test Mode Select Pin; Pull Low for Normal Operation

24 AVSS1 P Analog Ground

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 8 -

25 VBIAS AO Microphone Bias Voltage Supply (4.5V)

26 VREF AO

Connecting to External Decoupling Capacitor for Embedded Bandgap

Circuit; 2.25V Output

27 MICIN AI Microphone Input

28 VSEL AI

Line Out Voltage Swing Select

H: Pull Up to 5V, L: Pull Down to Ground

L: 2.5Vpp Output；H: 3.5Vpp Output

29 AVDD1 P 5V Analog Power for Analog Circ uit

30 LOL AO Line Out Left Channel

31 LOBS AO DC 2.25V Out put f or Line O ut Bias

32 LOR AO Line Out Right Channel

33 AVSS2 P Analog Ground

34 AVDD2 P 5V Analog Power for Analog Circ uit

35 DVDD P 5V Power Supply to Internal Regulator

36 DVSS2 P Digital Grounding

37 REGV AO 3.3V Reference Output for Internal 5V Æ 3.3V Regulator

38 MSEL DI, ST

Mixer Enable Select

H: Pull Up to 3.3V, L: Pull Down to Ground

L: Without Mixer; H: With Mixe r (With Default Mute)

USB Descriptors are changed accordingly

39 VOLUP DI, ST, PU Volume Up (Edge Trigger with de-Bouncing)

40 PDSW DO, 4mA , OD Power Down Switch Control (for PMOS Polarity)

0: Normal Mode, 1: Power Down Mode

41 USBDP AIO USB Data D+

42 USBDM AIO USB Data D-

43 GPIO1 DIO, 8mA,

PD, 5VT GPIO Pin

44 SCLK DIO, 8mA,

PD, 5VT External MCU Serial Bus Clock Pin

45 MINT DO, 4mA, SR

External MCU Interrupt Pin

When Register Address 4 ~ 7 has new data, MINT is set Low; after

MCU read MINT is reset to H

46 SDAT DIO, 8mA,

PD, 5VT External MCU Serial Bus Data Pin

47 MCLK DO, 4mA, SR

External MCU Clock Pin, Clock Frequency is Programmable

Default is 1.5 MHz (Options Include, 6MHz, 3MHz, 1.5MHz)

48 VOLDN DI, ST, PU Volume Down (Edge Trigger with de-Bouncing)

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 9 -

Note: DI – Digital Input Pad, DO – Digital Output Pad, DIO – Digital bi-Directional Pad, AI/AO/AIO – Analog

Pad, SR Slew Rate Control, ST – Schmitt Trigger, PD/PU – Pull Down or Pull Up, 5VT – 5 Volt Tolerant

(3.3V Pad), OD – Open Drain

4. MCU INTERFACE

CM109 provides a serial MCU Interface for external MCU to access internal registers with

these registers access. MCU and host side software can have bi-directional

communication. This interface can keep flexibility for external module control and

integrate, such as LCD panel.

5. BLOCK DIAGRAM

Block Diagram Of CM109

USB

TRX

USB

interface

U SB control

IS O o u t

processing

PLL1 48 M H z

clock

gen

12 M H z

VREF

(2.25V)

pow er on

reset

bandgap

3.3V

5 -> 3.3

regulator

REGV

ISO in

processing

SRAM

16 bit AD C

16 bit

DAC

+12 ~ -33 dB

32 steps

LOL

interface logics

MUTER MCU

I/F

VOLDN

VOLUP

VREF

MUTEP

LOR

LEDO

LEDR

PDSW

VBIA

S

4.5V

EEPROM

interface

CS

SK

DW

DR

USBDP

USBDM

MICIN

VREF +

-

LOBS

GPIO

+20dB boost enable

PWRSEL

MODE

MSEL BUZZ SPDIFO

0 ~ -45dB

38 steps

0 ~ -45dB

38 steps

16 bit

DAC

+22.5 ~ 0 dB

16 steps

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 10 -

6. ORDERING INFORMATION

Model

Number Package Operating Ambient

Temperature Supply Range

CM109 48-Pin LQFP

7mm×7mm×1.4mm (Plastic) 0 o C to +70 o C DVdd = 5V, AVdd = 5V

Outline Dimensions Dimensions shown in inches and （mm）

48-Lead Thin Plastic Quad Flatpack (LQFP)

Ordering Information Of CM109

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 11 -

7. FUNCTION DESCRIPTIONS

7.1 USB Interface

CM109 integrates USB transceiver, PLL, and regulator so only a few passive

components are necessary for the USB interface connection. Default USB descriptors

are embedded in CM109; therefore no additional design effort is needed for a generic

USB operation. PID changes with the jumper pin setting so different setting have

different PID. For customized product, customer can attach a 93C46 EEPROM to

override the embedded VID, PID and provide addition serial number for each set.

CM109 automatically detects 93C46 existence and performs the overwrite function

during power up.

7.1.1 Device Descriptor

Offset Field Size Value

(Hex) Description

0 bLength 1 12 Total 18 Bytes

1 bDescriptorType 1 01 Device Descriptor

2 bcdUSB 2 0110 USB 1.1 compliant.

4 bDeviceClass 1 00

5 bDeviceSubClass 1 00

6 bDeviceProtocol 1 00

7 bMaxPacketSize0 1 40 Endpoint zero Size = 64 bytes

8 idVendor 2 0d8c Vendor ID

10 idProduct 2 0008 ~

000F Product ID

Programmable by MSEL and

MODE pin

12 bcdDevice 2 0100 Device compliant to the Audio

Device Class specification

version 1.00

14 iManufacturer

1 01 Index of string descriptor

describing manufacturer

15 iProduct

1 02 Index of string descriptor

describing product

16 iSerialNumber

1 03 Index of string descriptor

describing the device’s serial

number

17 bNumConfigurations 1 01 Configurations number = 1

Note: VID, PID, and serial number can be overridden by external EEPROM content

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 12 -

7.1.2 Configuration Descriptor

Offset Field Size Value

(Hex) Description

0 bLength 1 09 Total 9 Bytes

1 bDescriptorType 1 02 Configuration Descriptor

2 wTotalLength

2 Total length of data returned for

this configuration

Programmable by MSEL and

MODE pin

4 bNumInterfaces

1 04 or 03 Number of interfaces supported

by this Configuration

(Decided by Speaker Mode and

Head Set mode):

0: control interface

1: ISO-OUT interface

2: ISO-IN interface (Option)

3: INT-IN(HID) interface

5 bConfigurationValue 1 01

6 iConfiguration 1 00

7 bmAttributes 1 A0 or E0 Programmable by PWRSEL

8 bMaxPower

2 32 or FA Maximum power consumption of

the USB

Programmable by MODE and

PWRSEL

7.1.3 Content Format for 93C46

id code 2 bytes

P ID 2 bytes

serial number

6 bytes

unused

addres s = 0

1W = 2Bytes

VID 2 bytes

670X where X = bit 4, 3, 2, 1

bit 2 serial number enable control 1: enable 0: disable

bit 1 prod uct string enable control 1: enable 0: disable

Content Format for 93C46

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 13 -

7.1.4 USB Audio Topology Diagram

USB Audio Topology Diagram

7.2 Jumper Pins and Mode Setting:

Several jumper pins can set the configuration of CM109. These jumper pin settings

affect both USB descriptors and USB audio topology. If MODE pin is pulled up to 3.3V

(speaker mode), a playback only function is activated and there is no recording function

declared to the host. At this setting, MSEL pin is ignored and only one input terminal,

one output terminal and one feature unit is declared in USB audio topology.

If MODE pin is pulled low (headset mode), a full duplex playback and recording function

is reported to the host. MSEL pin setting activates one mixer unit and one feature unit.

The following USB audio topology in Chapter: 7.1.4 is an example of headset mode.

PWRSEL pin affects the power configuration of CM109; together with MODE pin totally

4 combinations are programmable.

IT

OT

USB Out

M icrophone In

Feature U nit

(volume) (mute)

Speakerout

USBIN

Feature U nit

(volume) (mute)

ID = 0 1

ID=02

ID= 0 A

ID = 0 9

ID = 0 6

ID = 0 7

Feature U nit

(volume) (mute)

ID = 0 D

Mixer Unit

ID = 0 F

s e le c tor Unit

ID = 0 8

enable or disable by

M SEL pin

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 14 -

MODE

Combinations 3.3V GND

3.3V Speaker Mode :

Playback Only

(Self Power with 100mA)

Headset Mode :

Playback + Recording

(Bus Power with 100mA)

PWRSEL

GND Speaker Mode :

Playback Only

(Bus Power with 500mA)

Headset Mode :

Playback + Recording

(Bus Power with 500mA)

VSEL jumper pin sets the output voltage swing. When VSEL is connected to 5V,

output voltage swing is 3.5Vpp; when VSEL is connected to ground, output voltage

is 2.5Vpp.

7.3 HID Feature and Descriptions

HID feature is provided by CM109 so user setting to volume up, volume down, and

playback mute button pin is reported to the host to synchronize host side setting. In

addition, all CM109 internal registers can be accessed via HID function call.

USB protocols can configure devices at startup or when they are plugged in at run time.

These devices are broken into various device classes. Each device class defines the

common behavior and protocols for devices that serve similar functions. The HID

(Human Interface Device) class is one of the device classes.

The HID class consists primarily of devices that are used by humans to control the

operation of computer systems. Typical examples of HID class devices include:

- Keyboards and pointing devices, for example: mouse, trackballs, and joysticks.

- Front-panel controls, for example: knobs, switches, buttons, and sliders.

- Controls that might be found on devices such as VCR remote controls, games or

simulation devices, for example: data gloves, throttles, and steering wheels.

- Devices that may not require human interaction but provide data in a similar format

to HID class devices, for example: bar-code readers, thermometers, or voltmeters.

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 15 -

7.3.1 HID Descriptor

HID Interface Descriptor

Offset Field Size Value (Hex) Description

0 bLength 1 09 Size of this descriptor: 9 byte

1 bDescriptorType 1 04 INTERFACE descriptor type

2 bInterfaceNumber 1 03 Number of Interface: 3

3 bAlternateSetting 1 00 alternate 0

4 bNumEndpoints 1 01 Number of endpoints used by this

Interface: 1

5 bInterfaceClass 1 03 HID Interface Class

6 bInterfaceSubClass 1 00 No Subclass

7 bInterfaceProtocol 1 00 Must be set to 0

8 iInterface 1 00

Index of a string descriptor that

describes this interface.

HID Descriptor

Offset Field Size Value (Hex) Description

0 bLength 1 09 Total 9 Bytes

1 bDescriptorType 1 21 HID Descriptor Type

2 bcdHID 2 0100 HID class version 1.00

4 bCountryCode 1 00

5 bNumDescriptors 1 01

6 bDescriptorType 1 22 Report Descriptor

7 wDescriptorLength 2 0030 Numeric expression that is the total size

of the optional descriptor: 48 Bytes

Interrupt IN Endpoint Descriptor

Offset Field Size Value (Hex) Description

0 bLength 1 07 Total 7 Bytes

1 bDescriptorType 1 05 ENDPOINT Descriptor Type

2 bEndpointAddress 1 83 IN Endpoint

Endpoint number = 3

3 bmAttributes 1 03 Interrupt endpoint type

4 wMaxPacketSize 2 0004 Maximum packet size: 4 bytes

6 bInterval 1 20 32ms

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 16 -

7.3.2 Windows Software Architecture for HID

Note: Please conta ct with our sale s for the C-Media SDK example if needed.

7.4 Internal Registers

All internal registers of CM109 can be accessed via generic HID functional calls without

the need to develop kernel mode driver. Totally 4 bytes of data can be read or write from

HID. Input report is for read and output report is for write. Internal registers of CM109 are

used to control GPIO, S/PDIF output, EEPROM and MCU data access. Host side HID or

external MCU can access CM109 internal registers. With both sides accessed to the

same set of registers, two-way communication can be achieved.

7.4.1 Access via HID Class Command:

HID_IR0 to HID_IR3 are HID input report and is use by host side receiving data to

CM109. HID_OR0 to HID_OR3 are HID output report and is used by host side sending

adta to CM109

HID interrupt will occur when HID_IR0-3 are updated by button status MCU (and GPI in

case HID_IR0[7:6] == 2’b00).

PCI Enumerator

USB Class Driver(USBD.SYS)

USB HUB Driver(USBHUB.SYS)

USB

HID Class Driver(HIDCLASS.SYS)

Gameport MiniDriver(HIDGAME.SYS)

Gameport

Audio Driver

Keyboard Class Driver

Mouse Class Driver

Joy Stick Class Driver

C-Media SDK

Reports

(device specification)

Winmm.dll

Direct Input HID.dll

Applications

User32.exe or User.exe

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 17 -

HID_IR0 (HID input report byte 0)

Offset : 0x00

Bits Read/Write Description Default

7-6 R When HID_OR0[7] == 1’b0:

HID_IR0-3 are programmed by MCU (and GPI)

0: HID_IR1 is used as GPI

1: HID_IR0-3 are used as generic HID registers

2: Values written to HID_IR0-3 are also mapped

to MCU_CTRL, EEPROM_DATA0-1,

EEPROM_CTRL

3: Reserved

0x0

5-4 R When HID_OR0[7] == 1’b0:

Generic registers programmed by MCU

When HID_OR0[7] == 1’b1:

Mapped from MCU_CTRL[5:4]

0x0

3 R 0: No activity on Record-Mute button

1: Record-Mute button pressed then released 0x0

2 R 0: No activity on Playback-Mute button

1: Playback-Mute button pressed then released 0x0

1 R 0: Volume-Down button released

1: Volume-Down button pressed 0x0

0 R 0: Volume-Up button released

1: Volume-Up button pressed 0x0

HID_IR1 (HID input report byte 1)

Offset : 0x01

Bits Read/Write Description Default

7-0 R When HID_OR0[7] == 1’b0:

GPI (when HID_IR0[7:6] == 2’b00); or Generic

registers programmed by MCU (otherwise)

When HID_OR0[7] == 1’b1:

Mapped from EEPROM_DATA0

0x00

HID_IR2 (HID input report byte 2)

Offset : 0x02

Bits Read/Write Description Default

7-0 R When HID_OR0[7] == 1’b0:

Generic registers programmed by MCU

When HID_OR0[7] == 1’b1:

Mapped from EEPROM_DATA1

0x00

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 18 -

HID_IR3 (HID input report byte 3)

Offset : 0x03

Bits Read/Write Description Default

7-0 R When HID_OR0[7] == 1’b0:

Generic registers programmed by MCU

When HID_OR0[7] == 1’b1:

Mapped from EEPROM_CTRL

0x00

HID_OR0 (HID output report byte 0)

Offset : 0x04

Bits Read/Write Description Default

7-6 R/W 0: HID_OR1-2 are used for GPO; HID_OR0,

3 are used for buzzer and SPDIF

1: HID_OR0-3 are used as generic HID

registers

2: Values written to HID_OR0-3 are also

mapped to MCU_CTRL,

EEPROM_DATA0-1, EEPROM_CTRL (see

Note)

3: Reserved

0x0

5 R/W When HID_OR0[7] == 1’b0:

0: Buzzer off

1: Buzzer on

When HID_OR0[7] == 1’b1:

Mapped to MCU_CTRL[5]

0x0

4 R/W When HID_OR0[7] == 1’b0:

Valid bit in SPDIF frame

When HID_OR0[7] == 1’b1:

Mapped to MCU_CTRL[4]

0x0

3-0 R/W When HID_OR0[7] == 1’b0:

First nibble of SPDIF status channel

When HID_OR0[7] == 1’b1:

Reserved

0x0

Note : When EEPROM access is done, HID interrupt will occur. USB host can

get the result from interrupt pipe (endpoint 3).

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 19 -

HID_OR1 (HID output report byte 1)

Offset : 0x05

Bits Read/Write Description Default

7-0 R/W When HID_OR0[7:6] == 2’b00:

0: GPO drives L

1: GPO drives H

When HID_OR0[7:6] == 2’b01:

Generic HID registers

When HID_OR0[7:6] == 2’b1x:

Mapped to EEPROM__DATA0

0x00

HID_OR2 (HID output report byte 2)

Offset : 0x06

Bits Read/Write Description Default

7-0 R/W When HID_OR0[7:6] == 2’b00:

0: Set GPIO to input mode

1: Set GPIO to output mode

When HID_OR0[7:6] == 2’b01:

Generic HID registers

When HID_OR0[7:6] == 2’b1x:

Mapped to EEPROM_DATA1

0x00

HID_OR3 (HID output report byte 3)

Offset : 0x07

Bits Read/Write Description Default

7-0 R/W When HID_OR0[7] == 1’b0:

Category byte of SPDIF status channel

When HID_OR0[7] == 1’b1:

Mapped to EEPROM_CTRL

0x00

Note: HID_OR3 is used for SPDIF when SPDIF_CONFIG[5] == 1’b0

7.4.2 Access via External Serial Interface by MCU:

External MCU can write data to HID_IR0 to HID_IR3 and read data from HID_OR0 to

HID_OR3. MINT will be active when HID_OR0-3 are updated by Set_Output_Report

HID class command, and will be cleared after HID_OR0-3 are read by MCU.

CM109

High Integration / Low Cost USB Audio Controller

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Date: 08/Sep/2005 Version: 1.3a

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HID_IR0 (HID input report byte 0)

Offset : 0x00

Bits Read/Write Description Default

7-6 R/W 0: HID_IR0-3 are not used by MCU

1: HID_IR0-3 are used as generic HID

registers

2: Values written to HID_IR0-3 are also

mapped to MCU_CTRL,

EEPROM_DATA0-1, EEPROM_CTRL (see

Note)

3: Reserved

0x0

5 R/W When HID_IR0[7] == 1’b0:

0: Buzzer off

1: Buzzer on

When HID_IR0[7] == 1’b1:

Mapped to MCU_CTRL[5]

0x0

4 R/W When HID_IR0[7] == 1’b0:

Generic HID register

When HID_IR0[7] == 1’b1:

Mapped to MCU_CTRL[4]

0x0

3 R 0: No activity on Record-Mute button

1: Record-Mute button pressed then released 0x0

2 R 0: No activity on Playback-Mute button

1: Playback-Mute button pressed then

released

0x0

1 R 0: Volume-Down button released

1: Volume-Down button pressed 0x0

0 R 0: Volume-Up button released

1: Volume-Up button pressed 0x0

Note: When EEPROM access is done, MINT will be active. MCU should read

HID_OR0-3 to get the result, and then MINT will be cleared.

HID_IR1 (HID input report byte 1)

Offset : 0x01

Bits Read/Write Description Default

7-0 R/W When HID_IR0[7] == 1’b0:

Generic HID registers

When HID_IR0[7] == 1’b1:

Mapped to EEPROM_DATA0

0x00

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 21 -

HID_IR2 (HID input report byte 2)

Offset : 0x02

Bits Read/Write Description Default

7-0 R/W When HID_IR0[7] == 1’b0:

Generic HID registers

When HID_IR0[7] == 1’b1:

Mapped to EEPROM_DATA1

0x00

HID_IR3 (HID input report byte 3)

Offset : 0x03

Bits Read/Write Description Default

7-0 R/W When HID_IR0[7] == 1’b0:

Generic HID registers

When HID_IR0[7] == 1’b1:

Mapped to EEPROM_CTRL

0x00

HID_OR0 (HID output report byte 0)

Offset : 0x04

Bits Read/Write Description Default

7-6 R When HID_IR0[7] == 1’b0:

HID_OR0-3 are programmed by USB host

0: HID_OR1-2 are used for GPO

1: HID_OR0-3 are used as generic HID

registers

2: Values written to HID_OR0-3 are also

mapped to MCU_CTRL,

EEPROM_DATA0-1, EEPROM_CTRL

3: Reserved

When HID_IR0[7] == 1’b1:

Always 2’b11

0x0

5-4 R When HID_IR0[7] == 1’b0:

Generic registers programmed by USB host

When HID_IR0[7] == 1’b1:

Mapped from MCU_CTRL[5:4]

0x0

3-0 R When HID_IR0[7] == 1’b0:

Generic registers programmed by USB host

When HID_IR0[7] == 1’b1:

Always 4’h0

0x0

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 22 -

HID_OR1 (HID output report byte 1)

Offset : 0x05

Bits Read/Write Description Default

7-0 R When HID_IR0[7] == 1’b0:

Generic registers programmed by USB host

When HID_IR0[7] == 1’b1:

Mapped from EEPROM_DATA0

0x00

HID_OR2 (HID output report byte 2)

Offset : 0x06

Bits Read/Write Description Default

7-0 R When HID_IR0[7] == 1’b0:

Generic registers programmed by USB host

When HID_IR0[7] == 1’b1:

Mapped from EEPROM_DATA1

HID_OR3 (HID output report byte 3)

Offset : 0x07

Bits Read/Write Description Default

7-0 R When HID_IR0[7] == 1’b0:

Generic registers programmed by USB host

When HID_IR0[7] == 1’b1:

Mapped from EEPROM_CTRL

0x00

7.4.3 Indirect Accessed Registers:

MCU_CTRL (MCU control)

Offset : 0x08

Bits Read/Write Description Default

7-6 -- Reserved 0x0

5-4 R/W 0: MCLK operating at 1.5MHz

1: MCLK operating at 3MHz

2: MCLK operating at 6MHz

3: Reserved

0x0

3-0 -- Reserved 0x0

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 23 -

EEPROM_DATA0 (Low byte of EEPROM data)

Offset : 0x09

Bits Read/Write Description Default

7-0 R/W Low byte of EEPROM data to be accessed 0x00

EEPROM_DATA1 (High byte of EEPROM data)

Offset : 0x0a

Bits Read/Write Description Default

7-0 R/W High byte of EEPROM data to be accessed 0x00

EEPROM_CTRL (Serial EEPROM access control)

Offset : 0x0b

Bits Read/Write Description Default

7 R/W When Register Read:

0: No EEPROM access pending

1: Last EEPROM access pending

When Register Write:

0: No action

1: Start EEPROM access (will clear to 0

automatically)

0x0

6 R/W 0: Read EEPROM

1: Write EEPROM 0x0

5-0 R/W Address of serial EEPROM 0x00

7.5 MCU Interface

On MCU serial interface, CM109 serves as a slave device with bit rate up to 400Kbps

(fast mode). MCU can read/write 3 bytes to CM109 device with a 2-bit register address.

Since host side and MCU can both access to all the internal registers, access contention

when both host and MCU try to access the same register should be avoided on

application. The 7-bit slave address of CM109 is assigned as 7’b0111000.

When a one-byte data is written by MCU, CM109 will transfer totally 4 bytes to the USB

host via an additional interrupt pipe. The sequence of the upward HID report is the

button status first (address 00), then register with address 01, then register with address

02, then register with address 03. The USB host will keep polling the upward HID

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 24 -

report every 32mS. When there is any button pressed or released, or MCU data

coming, CM109 will transfer the 4 bytes of HID report to the USB host again.

CM109 can also transfer one byte MCU data from the USB host to its register. This is

accomplished by a ‘Set Output Report’ HID class request via default control pipe. MCU

can get this downward byte by interrupt or polling.

CM109 has one input pin ‘SCLK’ where it gets serial clock from MCU, and one

open-drain output pin ‘SDAT’ where it sends or receives serial signal to/from MCU. As

shown below, ‘SDAT’ should be stable when ‘SCLK’ is high, and can have transition only

when ‘SCLK’ is low.

START and STOP conditions shown below are the exception. Every transaction

begins from a START, and ends with a STOP, or another START (repeated START).

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 25 -

The figure below demonstrates a typical transaction. After every 8 bits sent by the

transmitter, the receiver should send one bit low for positive acknowledgement or one bit

high for negative acknowledgement. After the negative acknowledgement, a STOP or

repeated START should follow. The next figure shows more detailed about

acknowledgement bit. Note that ‘SCLK’ is always driven by the master.

SDAT

SCLK

Data Transfer on the MCU Interface

START or Repeated

START Condition STOP or Repeated

START Condition

Acknowledgement

Signal from Rece iver Acknowledgment

Signal from Receiver

P

Sr

or

P

S

or

Sr

MSB

12789 123 - 8 9

ACK ACK

The figure below shows a complete data transfer. After a START, MCU should send

7-bit slave address (7’b0111000) first, and then the 8th bit denotes a read transfer when

it’s high; or a write transfer when it’s low. The first acknowledgement is always from

CM109.

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 26 -

In the write transfer, MCU keep acting as the master and the transfer direction is not

changed. The following figure gives an example of one byte write transfer.

CM109 regards the first DATA byte as the regi ster address. The second DATA byte is

the content that MCU writes at the register address. If there is the third DATA byte,

CM109 will auto-increment this byte to the next register address.

The figure below shows an example of two bytes read transfer. Because CM109 has

auto-increment function, the second DATA byte will be the register data on the next

address.

Please note that the USB host tries to get new HID data every 32mS. It’s quite slow.

If the continuous write transfers are too close in time, the former transfer may have no

effect.

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 27 -

The figure below shows typical transactions between MCU and CM109. After a

START, MCU should send 7-bit slave address (0111000) first, and then the 8th bit

denotes a read transfer when it’s high; or a write transfer when it’s low.

MCU write:

S 0x70

0 0x00 0 Byte 0 0 Byte 1 0 Byte 2 0 Byte 3 0 P

MCU read:

S 0x70

0 0x04 0

S 0x71 0 Byte 0 0 Byte 1 0 Byte 2 0 Byte 3 1 P

From CM109 to MCU From MCU to CM109

S START condition P STOP condition

0 Positive acknowledge 1 Negative acknowledge

Byte n One byte data (address n)

In a write transfer, MCU keeps acting as the transmitter. CM109 regards the first

DATA byte as start register address (it’s better to be 0x00). The followin g four DATA

bytes are the content that MCU writes to the register addresses. In a read transfer,

two transactions are necessary. MCU resets start register address by the first

transaction. Then MCU changes to be the receiver during the second transaction to

get four bytes of data.

Note 1: Bits 0~3 of the first HID byte always reflect button activity, so they can not be

written by MCU.

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 28 -

7.6 Buzzer Output

Each time the software set "1" to the register HID-OR0 bit 5, an embedded ringing

sequence is played once. Since the delay between one sequence and next sequence

is long (around 1 second ~ 2 second), this delay to be set by software, H/W only play

one sequence and then stop for one register write.

0.025 sec 0.025 sec

5KHz 300Hz

0.025 sec 0.025 sec

5KHz 300Hz

0.025 sec 0.025 sec

5KHz 300Hz

0.025 sec 0.025 sec

5KHz 300Hz

0.2 sec

ringing

0.1 sec

silent

0.2 sec

ringing

0.4 sec

silent

0.2 sec

ringing

0.1 sec

silent

0.2 sec

ringing

ringing phase content

silent & w ait next trigger

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 29 -

8. ELECTRICAL CHARACTERISTICS

8.1 Absolute Maximum Rating

Symbol Parameter Value Unit

Dvmin Min Digital Supply Voltage – 0.3 V

Dvmax Max Digital Supply Voltage + 6 V

Avmin Min Analog Supply Voltage – 0.3 V

Avmax Max Analog Supply Voltage + 6 V

Dvinout Voltage on any Digit al Input or

Output Pin –0.3 to +5.5 V

Avinout Voltage on any Analog Input

or Output Pin –0.3 to +5.5 V

Tstg Storage Temperature Range -40 to +125 0C

ESD (HBM) ESD Human Body Mode 3500 V

ESD (MM) ESD Machine Mode 200 V

8.2 Operation Conditions

Operation conditions

Min Typ Max Unit

Analog Supply Voltage 4.5 5.0 5.5 V

Digital Supply Voltage 4.5 5.0 5.5 V

Total Power Consumption - - TBD

Suspend Mode Power Consumption - 320 - uA

Operating ambient temperature 0 - 70 0C

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 30 -

8.3 Electrical Parameters

Min Typ Max Unit

DAC (10K Ohm Loading)

Resolution - 16 - Bits

THD + N (-3dBr) - -74.29 - dB

SNR - 93.6 - dB

Silent SNR - 98.2 - dB

Dynamic range - 93.8 - dB

Frequency response 48KHz 20 - 20K Hz

Frequency Response 44.1KHz 20 - 20K Hz

Output Boltage (rms) - 1.25 - Vrms

Output Voltage Swing 0.5 - 4.0 V

DAC (32 Ohm Loading)

Resolution - 16 - Bits

THD + N (-3dBr) - -71.1 - dB

SNR - 93.7 - dB

Silent SNR - 98.2 - dB

Dynamic Range - 93.8 - dB

Frequency Response 48KHz 20 - 20K Hz

Frequency Response 44.1KHz 20 - 20K

Output Voltage (rms) - 1.25 - Vrms

Output Voltage Swing 0.5 - 4.0 V

ADC

Resolution - 16 - bit

THD + N (-3dBr) - -76.1 - dB

SNR - 83.1 - dB

Dynamic Range - 81.6 - dB

Frequency Response 48KHz 20 - 19.2 Hz

Frequency Response 44.1KHz 20 - 17.6 Hz

Input Range 0 - 2.88 Vpp

Amplification

Volume Control Level -45 - 0 dB

Volume Control Step - 38 - Steps

Microphone Input

Boost Gain - +20 - dB

Gain Adjustment Range 0 - 22.5 dB

Gain Adjustment S teps - 16 - S teps

Mixer Gain Adjustment -33.0 - 12.0 dB

Mixer Gain Adjustment Steps - 32 - Steps

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 31 -

9. FREQUENCY RESPONSE GRAPHS

9.1 Digital Playback for Line Output Frequency (10K Ohm Loading)

9.1.1 Frequency Response 48Ks/Sec (10K Ohm Loading)

C -m edia 07/15/03 19:03:14Digital Playback (P C-D -A) for Line O utput Frequency

Response

WL-Multitone-48k.at2

Color Line Style Thic k Data Axis

Gree n Solid 2 Fastte st.Ch.1 Ampl!N ormalize L eft

Yellow Solid 2 Fa stte st.C h.2 Ampl!N ormalize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

A

30 10k50 100 200 500 1k 2k 5k

Hz

9.1.2 Frequency Response 44.1Ks/Sec (10K Ohm Loading)

C-m edia 07/15/03 19:05:40Digital Playb ack (PC-D-A) f or L ine Outp ut Fre quenc y

Response

WL-Multitone-44k.at2

Color Line Style Thick Data Axis

Green Solid 2 Fasttest.C h.1 Ampl!N ormalize Left

Yell ow Soli d 2 Fasttest.Ch. 2 Am pl!Nor m al ize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

A

20 10k50 100 200 500 1k 2k 5k

Hz

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 32 -

9.2 Digital Playback for Line Output Frequency (32 Ohm Loading)

9.2.1 Frequency Response 48Ks/Sec (32 Ohm Loading)

C -m edia D igital Recording (A -D -P C) for Line Input Frequency R esponse

LW-MFreqResp-48K.at2

Color Line S tyle Thick Data Axis

Cyan Solid 2 Fasttest.C h.1 Ampl!N ormalize Left

Yellow Solid 2 Fasttest.Ch.2 Ampl!N ormalize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

1

20 10k50 100 200 500 1k 2k 5k

Hz

9.2.2 Frequency Response 44.1Ks/Sec (32 Ohm Loading)

C-m edia D igital R ecording (A-D -PC ) for Line Input Frequency R esponse

LW-MFreqResp-44K.at2

Color Line S tyle Th ick Data Axis

Gre en Solid 2 Fasttest.C h.1 Ampl!Normalize Left

Yellow Solid 2 Fas ttest.C h.2 Ampl!Normalize Le ft

-6

+1

-5

-4

-3

-2

-1

+0

d

B

20 10k50 100 200 500 1k 2k 5k

Hz

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 33 -

9.3 Digital Recording for Line Output Frequency

9.3.1 Frequency Response 48Ks/Sec

C-MEDIA 07/21/03 14:27:29Digital Playback (P C-D-A ) for Line Output F requency

Response

WL-Multitone-48k.at2c

ColorSweep Trace Line Style Thick Da ta Axis Comment

1 1 C yan Solid 2 Fasttest.Ch.1 Ampl!Normalize Left

1 2 Yellow Solid 2 Fasttest.C h.2 Ampl!N ormalize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

A

30 10k50 100 200 500 1k 2k 5k

Hz

9.3.2 Frequency Response 44.1Ks/Sec

C-ME DIA 07/21/03 15:16:55Digital Playback (PC-D -A) for Line Outp ut Frequency

Response

WL-Multitone-44k.at2c

ColorSweep Trace Line Style Thick Data Axis C omment

1 1 Cyan Solid 2 Fasttest.Ch.1 Ampl!Normalize Left

1 2 Yellow Solid 2 Fasttest.C h.2 Ampl!Normalize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

A

20 10k50 100 200 500 1k 2k 5k

Hz

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 34 -

10. APPLICATION CIRCUIT REFERENCE

CM109

High Integration / Low Cost USB Audio Controller

for PC Internet Phone

Date: 08/Sep/2005 Version: 1.3a

- 35 -

REFERENCE

USB-IF, USB Specification, Revision 1.1 and 2.0, and USB Audio Device Class Specification,

Revision 1.0,.

－End of Specifications－

C-MEDIA ELECTR ONI CS INC.

6F., 100, Sec. 4, Civil Boulevard, Taipei, Taiwan 106 R.O.C.

TEL:886-2-8773-1100

FAX:886-2-8773-2211

E-mail：sales@cmedia.com.tw URL：http://www.cmedia.com.tw