ICs for Communications
ACE Demo Car-Kit
SEK 2172 Version 1.0
Tool Description 10.99
DS 1
•
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in Germany or the Infineon Technologies Companies and Representatives worldwide:
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SEK 2172
Revision History: Current Version: 10.99
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Edition 10.99
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SEK 2172
Table of Contents Page
Tool Description 3 10.99
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.1 System and Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2 How to Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.1 Assemble parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.2 Demonstration Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.3 Serial V.24 Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3 Detailed Description of Car-Phone Demo . . . . . . . . . . . . . . . . . . . . . . . .13
3.1 Modules used in Car-Phone Demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2 Some Explanations about full- and half-duplex . . . . . . . . . . . . . . . . . . . . . .14
3.2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.2.2 Considerations to prevent echoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.3 Noise Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.4 Comfort Noise and Noise Adaptation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4 Hardware Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.1 ACE Car-Kit Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.1.1 List of Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.1.1.1 Microcontroller Connector JP1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.1.1.2 IOM Connector J7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.1.1.3 Analog Interface Connector P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.1.1.4 Loudspeaker Connector J12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.1.1.5 Loudspeaker Connector J14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1.1.6 Microphone Connector J11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1.1.7 12 V Power Supply Connector JP3 . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1.1.8 5.0 V Power Supply Connector JP4 . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.1.2 List of Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.1.2.1 Microphone Feeding J10, J13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.1.2.2 Selection of Single-Ended Inputs, JP2 . . . . . . . . . . . . . . . . . . . . . . . .19
4.1.2.3 Enable Loudspeaker Power Amplifier, J9 . . . . . . . . . . . . . . . . . . . . . .20
4.1.2.4 Power Supply 5 Volts, J8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.1.3 Circuit Diagram of ACE Car-Kit Evaluation Board . . . . . . . . . . . . . . . . . .21
4.1.4 Footprint of ACE Car-Kit Evaluation Board . . . . . . . . . . . . . . . . . . . . . . .22
4.2 Microcontroller Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.2.1 List of Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.2.1.1 IOM Connector JP3, JP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.2.1.2 Digital Expansion Port Connector JP1 . . . . . . . . . . . . . . . . . . . . . . . . .23
4.2.1.3 Analog Expansion Port Connector JP5, P2 and WJ1 . . . . . . . . . . . . .23
4.2.1.4 V.24 Serial Interface P1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.2.2 List of Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.2.2.1 Background light J1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
SEK 2172
Tool Description 5 10.99
Preface
The ACE Demo Car-Kit is intended to demonstrate a full-duplex hands-free conversation
with noise reduction in a car. It has been designed as a stand-alone box with
microcontroller and optional PC access via serial port. The ACE Demo Car-Kit contains
all necessary parts for a full-duplex hands-free demo in a car, apart from the dedicated
mobile phone C25 from SIEMENS.
The hands-free operation feature is carried out by an acoustic echo canceller which
works in subband mode and provides a fast adapting FIR filter for reproduction of the
acoustical car environment. To suppress car noise, a noise reduction block is included
in the speakerphone module.
The hands-free parameters are optimized for medium price range cars. In those
environments a full-duplex conversation is provided in several volume steps. For
demonstration purposes noise reduction, full-duplex speakerphone, comfort noise etc
can be switched off and on. As a result the effects of the features can be pointed out at
best.
For evaluation there is access to all registers of ACE V2.1 (PSB 2170) and SAM-AFE
dual codec (PSB4851) via common PC’s serial port. With the coefficient program
CP2170 the values can be displayed and changed in physical units. The peak meter,
available as ACE module, can be dispayed as logarithmic bargraph and in hexadeximal
values. The maximal value is hold. This makes gain adjustment with external register
access easier. The external register access is not needed for usual operation, but
advanced hardware setup can be done.
There are two derivates of ACE Demo Car-Kit. SEK 2172 is not available now, but will
be assembled with ACE V2.1. During the time, ACE V2.1 is not available, SEK 2172-D
can be used to run the latest firmware as download in an evaluation chip (SAM-EVAL
V3.0). By the way, the SAM-Eval chip combines the hardware of SAM (PSB4860) and
ACE (PSB2170) and is only meant for development and evaluation. Therefore the
handling of the SAM-Eval chip is more difficult than the use of the ready device, but offers
the possibility to evaluate the firmware and the behavior of a non available device. In the
ACE Demo Car-Kit, the microcontroller takes the difficult part - the download - and that
is exactly why you can use the SEK 2172-D in the same way as with the ACE V2.1
mounted. The only difference is the download time at power up.
Organization of this Document
This Tool Description is divided into 4 chapters. It is organized as follows:
•Chapter 1, Overview
Gives a general description of the ACE Demo Car-Kit
•Chapter 2, How to Start
Cookbook like description of getting started
SEK 2172
Tool Description 6 10.99
•Chapter 3, Detailed Description of Car-Phone Demo
Some considerations about full-duplex hands-free phones
•Chapter 4, Hardware Description
List of connectors and jumpers, circuit diagram and footprint for ACE Car-Kit
Evaluation Board and Microcontroller Board.
Related Documentation
•Data Sheet: ACE PSB 2170 Version 2.1
•Data Sheet: SAM-AFE PSB 4851 Version 2.1
•Technical Description: ACE Car-Kit Evaluation Board SIPB2170 Version 1.0 (04.98)
•Software Description: Coefficient Program for SAM/ACE Version 1.0 (11.97)
Your Comments
We welcome your comments on this document as we are continuously aiming at
improving our documentation. Please send your remarks and suggestions by e-mail to
sc.docu_comments@infineon.com
Please provide in the subject of your e-mail:
device name ( ), device number (SEK 2172), device version (Version 1.0),
and in the body of your e-mail:
document type (Tool Description), issue date (10.99) and document revision number
(DS 1).
SEK 2172
Overview
Tool Description 7 10.99
1 Overview
The ACE Demo Car-Kit (SEK 2172) is a demonstration platform to show the
performance of the Acoustic Echo Canceller ACE (PSB 2170) for hands-free car-phone
applications with noise reduction. The Demo Car-Kit contains an ACE Car-Kit Evaluation
Board (SIPB 2170) and a controller board with keys and a display. The controller board
and the firmware running in the µC is described in the following chapters. For more
information about the ACE Car-Kit Evaluation Board, please refer to the tool description
of SIPB2170.
1.1 System and Block Diagram
Figure 1-1 shows the system diagram of the ACE Demo Car-Kit.
Figure 1-1 ACE Demo Car-Kit system overview
Microphone, Loudspeaker (8 Ω) and mobile phone C25 can be directly connected to the
ACE Demo Car-Kit. C25 is automatically switched to hands-free car-kit mode when
plugged in the Comfort-Cradle which is part of the package. Please connect an external
antenna to the cradle to avoid EMC effects.
ACE Demo Car-Kit
C25
(SIEMENS)
EPROM
1234
ok - +
display
µC
ACE
SAM-
AFE
SEK 2172
Overview
Tool Description 8 10.99
Figure 1-2 shows the block diagram of the ACE Demo Car-Kit.
Figure 1-2 Block diagram
The ACE Car-Kit Evaluation Board contains the analog and digital signal processing part
of the ACE Demo Car-Kit.
The dual codec SAM-AFE (PSB 4851) converts the analog signals to digital and digital
signals to analog. Digital signal processing is carried out in ACE (PSB 2170). The
modules used in the ACE are the analog interface channels, AGC, Equalizer and
Speakerphone. See Chapter 3 for further information. The startup and volume setting is
done by the controller board. The µC reads the needed values from the EPROM and
writes parameters via SCI to SAM-AFE and ACE. In case of a download version of ACE,
the download is also stored in the EPROM. In this case, SEB 2160 is mounted on the
Evaluation Board instead of the ACE chip.
ACE Car-Kit
Evaluation Board
ACE
PSB 2170
or
SAM/ACE-Emulation Board
SEB 2160
SAM-AFE
PSB 4851 PA
passive
components
Power
Supply
8..16V
SUB-D 9
Analog I/O
5 V
3.3 V
SP Test
LEDs
passive
components
Controller
Board
EPROM
1234
ok - +
display
IOM-2 / SSDI
Connector
SUB-D 9
serial port
v24
driver
5 V
reset
µC
expansion port
(unused)
SEK 2172
Overview
Tool Description 9 10.99
The controller board contains the display and keys for menu based parameter setting.
This is done with parameter files which program SAM-AFE and ACE via SCI. For direct
access to all parameters available in ACE, a PC’s serial port can be directly connected
to the ACE Demo Car-Kit.
In Figure 1-2 the SAM/ACE Emulation Board (SEB2160) is shown as a replacement for
the ACE. The SEB2160 is mounted in the ACE Demo Car-Kit with download (SEK 2172-
D). In this case the EPROM contains the download firmware and the ACE Demo Car-Kit
needs about 1 minute for downloading the firmware to the evaluation chip. After
download the evaluation chip acts similarly to the ACE and all features are available.
SEK 2172
How to Start
Tool Description 10 10.99
2How to Start
This chapter describes the procedure how to assemble the parts of the ACE Demo Car-
Kit and operation step by step. Additional equipment, which is not included in the kit, are
the mobile phone C25 from SIEMENS and an antenna for car use (for example with
magnet socket).
2.1 Assemble parts
•Place the
- microphone near the rearview mirror
- loudspeaker in the foot area of the front passenger or in the compartment in the
door
- antenna at the top of the car
•connect
- comfort-cradle, microphone and loudspeaker to ACE Demo Car-Kit
- antenna to comfort-cradle of C25
•plug in C25 to comfort-cradle
•power up the ACE Demo Car-Kit (red cable +12V, black cable ground) e.g. at cigarette
lighter.
If the ACE Demo Car-Kit (SEK 2172-D) is equipped with SIPB2160, the display shows
for about 1 minute. If not, press the reset button. During download, all key and V.24
access is ignored. After download has been completed, the system is running with
volume 5 and all features enabled. As startup information, the following is displayed:
This message occurs after power up if no download is needed. This is the case, if the
ACE V2.1 is mounted on the ACE Car-Kit Evaluation Board.1)
After this a call with the C25 can be set up. During the first call, please select softest
volume at the C25 and store this selection. With this setup, the internal signal processing
of the C25 has the least effect. This is important as you want to listen to the full-duplex
signal processing of ACE.
For demonstration of ACE’s features and loudspeaker volume control, select one of the
demonstration files described below.
.
.
.
.downloading
Infineon
Technologies
ACE Demo
Car-Kit 9909
1) device number SEK 2172
SEK 2172
How to Start
Tool Description 11 10.99
2.2 Demonstration Files
The demonstration files, stored in the EPROM, can be accessed by the menu key + and
-. Demonstration files are, for example Echo Canceller on/off. To load the register
setting of a file to ACE and SAM-AFE, the specific file is selected by key +, or - and
confirmed by key ok. The first 4 files can be selected by the shortcut keys 1 to 4.
Demonstration Files
1. Echo Canceller on/off
2. Noise Reduction on/off
3. Wiener Filter on/off
4. Comfort Noise on/off
5. Volume 1 (softest)
6. Volume 2
7. Volume 3
8. Volume 4
9. Volume 5 (default)
10.Volume 6
11.Volume 7 (loudest)
12.Show Peak value
13.Extended Menu
File 1 to 4. For more information about Echo Cancelling, Noise Reduction, the Wiener
Filter and Comfort Noise injection refer to Chapter 3.
File 5 to 11. To increase the volume of the loudspeaker, please do not change the
volume setting at the C25, but select one of the volume files. The default is volume 5. To
increase the volume, select volume 6 or 7. The volume should be adjusted to a pleasant
volume when the car engine is switched off. Due to the noise of a driving car, the
loudspeaker gain is increased up to 10dB to keep a pleasant volume. This is one feature
of the ACE.
File 12. Show Peak value displays the total peak value in logarithmic and hexadecimal.
It is very useful if someone wants to adjust the parameters of SAM-AFE and ACE via
V.24 serial port with a PC and the register software CP2170. The peak meter is
implemented in the ACE at register 45hex and 46hex. The ACE Demo Car-Kit Software
continously reads the peak meter (register 46hex) and holds the maximum peak value
for about 1 second and as a result, gain adjustment is very easy. To stop the peak
display, press the key ok.
The default input of the peak meter is the microphone output signal (S3).
SEK 2172
How to Start
Tool Description 12 10.99
File 13. The Extended Menu is not a set up file like the others, as it offers the possibility
to restart the ACE Demo Car-Kit. This is selected by key 1. Restart means, that no
download is done (only SEK 2172-D), but all startup register setting is forced. This is very
useful, if after a V.24 register access a system restart is wanted. If no download is
implemented (SEK 2172), a hardware reset does exactly the same.
After a V.24 parameter optimization, it may be desired to store the parameters in the
ACE Demo Car-Kit. This can be done by key 3. With this, all ACE and SAM-AFE
registers are stored in the EEPROM of the controller. To reload the stored setting, press
key 2.
2.3 Serial V.24 Access
To use the CP2170 with the ACE Demo Car-Kit only one setting for the V.24 interface is
valid: 19200 baud, 8 data bits, no parity, 1 stop bit, no handshake. The COM port can be
selected in the configuration file (cp.cfg).
After execution of CP2170, a simple status information appears in the right half of the
bar in the first line of the screen. A * means that everything is OK. Any other character
indicates an error (’E’rror or ’T’imeout). In this case the software will no longer try to
access the kit and must be terminated. Once the software has been successfully started,
the keys are locked and no demonstration files can be started. If CP2170 is terminated,
the keys work as usual.
For connection of the serial PC port with the V.24 interface of the ACE Demo Car-Kit, a
null-modem cable is required. Please read the software description of CP2170 for further
information.
1) Restart
2) Load set
3) Store set
SEK 2172
Detailed Description of Car-Phone Demo
Tool Description 13 10.99
3 Detailed Description of Car-Phone Demo
This chapter explains the effects which can be heard while running the ACE Demo Car-
Kit. Please note that this chapter does not include a full description of all features which
are provided by ACE V2.1.
3.1 Modules used in Car-Phone Demo
The signal path built with the freely configurable modules in ACE can be seen in Figure
3-1. The receive signal (downlink) is A/D-converted in channel 1 of SAM-AFE. Analog
gains are optimized to the lowest volume of C25. With this volume, the influence of C25’s
signal processing is very small. After that, the signal is amplified or attenuated in an AGC
to about -15dB (reference: full 16bit range = 0dB). The leveled signal passes the
Speakerphone module and reaches one of the equalizers. In the equalizer, the
frequency response is processed in that way so that no resonances of the loudspeaker-
box can occure. After that, the signal is D/A-converted and amplified in the Codec. The
volume of the loudspeaker must be controlled by the ACE Demo Car-Kit’s keys and
display, and not by the C25 mobile phone!
What comes next in the signal path? The signal is reflected in the car and reaches the
microphone. Here it is amplified and A/D-converted. The frequency response is filtered
into the second equalizer and fed to the Speakerphone module. Here the echo is
removed, as described below and the remaining signal reaches the D/A-converter for
transmit (uplink).
Figure 3-1 Car-Phone signal path
ACE V2.1
PSB2170
Codec SAM AFE
PSB4851
Speaker-
phone
acoustic
line
AGC
D
A
AD
D
A
D
A
ω
ω
SEK 2172
Detailed Description of Car-Phone Demo
Tool Description 14 10.99
3.2 Some Explanations about full- and half-duplex
3.2.1 Introduction
In a traditional telephone connection which uses handsets on both sides there is always
a full-duplex conversation. Because the gains required for the microphone and the
earpiece are moderate, no extra work has to be done to prevent acoustical feedbacks
(echoes). As soon as people start to enjoy hands-free telephony - whether in the office
or in the car - the signal levels for loudspeaker and microphone become greater. If there
would be no circuitry to prevent the acoustical feedback, the calling partner at the far-end
telephone would hear himself very loudly, especially if the phone conversation takes
place on a mobile phone, the speech is delayed and the echoes extremely disturb the
person calling.
3.2.2 Considerations to prevent echoes
In the past when DSPs were expensive, slow and weak in performance, the only
possibility to prevent an echo was to cut off the unused signal connections. This means
signal transmission is permitted only in one direction. Either from the handset phone to
the speakerphone, or the other way round, but not both transmission paths at the same
time. In this document this method is called half-duplex.
A circuitry in a phone or an algorithm in a DSP has to decide, which person is the caller
and which the receiver, and the corresponding path has to be switched to transmission.
The other path gets an attenuation of about 40 dB to prevent the echo. This algorithm is
also called the Stronger-Wins-Algorithm because in a double talk situation the person
with the stronger voice will get the transmission path and the other can not be
understood. In case of a half-duplex conversation both persons have to be very
disciplined and let the other finish speaking to avoid misunderstandings because of
cutting off words.
Nowadays’ DSP performance is much more powerful, and sophisticated algorithms can
process speech signals. Therefore it is possible to simulate the acoustical behavior of
the room where the hands-free phone is used by a digital FIR Filter and subtract the
simulated signal from the microphone signal. The better the image of the room acoustics,
the better the echo cancellation.
The performance of an Echo Canceller can be benchmarked by the rate, the algorithm
needs to adapt the Echo-Cancel-Filter to the room acoustics. The faster the adaptation,
the better the echo cancellation, as in a car acoustics continuously changes: The driver
is turning the steering wheel, the gear shift lever is used, because of a strong break
passengers move around, etc. In all these situations the Echo Canceller has to adapt to
the new room acoustics. The Echo-Filter is well adapted, if the echo, which can be heard
at the far end telephone is reduced to a minimum. Otherwise a strong echo can be heard.
To prevent this, a combination of Echo Canceller and Stronger-Wins-Method are
available in the ACE.
SEK 2172
Detailed Description of Car-Phone Demo
Tool Description 15 10.99
ACE provides an AGC which is useful to give the far-end input a defined level. In view of
the SNR of the signals, a signal value as high as possible is advantageous but to avoid
signal overload the compare level of the AGC is adjusted to -15 dB.
The AGC is a very good method to comfortably adjust the volume in the car. Because
people speak with different strength, the person in the car can adjust the signal level at
his will and need not care about different speakers.
3.3 Noise Reduction
The speakerphone module supports a Noise Reduction block in the receive path which
reduces sound by regular signal power. Signal power of speech is usually rather irregular
and will not be filtered. One parameter is provided to adjust the maximal amount of noise
reduction. If speech is distorted too much, the parameter has been adjusted too high.
Values from 12 to 16 dB give best performance of the Noise Reduction unit. The
background noise is reduced to a minimum and the distortion of the speech signal is
negotiable.
3.4 Comfort Noise and Noise Adaptation
The comfort noise algorithm makes conversation more easy for the far-end caller. Think
of a situation, the echo canceller is not fully adapted because the driver is turning. The
echo suppression gives some attenuation to prevent echoes. In this case, the far-end
caller will recognize the attenuation because the car noise is getting softer. To cover this,
artificial noise is injected in the transmit signal. As a result of this, the attenuation can
only be heard in the speaker’s voice and not in the background noise. After a short time,
the echo canceller has fully readapted and the echo suppressor is not needed. Though
the comfort noise is only needed for very short periods of time, it improves the
performance of the car-phone.
Noise Adaptation shows it’s effect inside the car. With this, four parameters can be
adapted depending on the noise level in the car. There are two important parameters:
the loudspeaker gain and the total attenuation. The loudspeaker gain is incremented if
the noise level in the car rises. This makes manual volume control unnecessary. To
prevent distortion in the loudspeaker, the volume increase is limited. The total
attenuation is reduced if noise level in the car rises as the echo is masked by car noise.
With this, a side effect is eliminated. In a noisy environment, the echo canceller needs a
little more time to fully adapt. If echo cancel requirement is decreased, the adaptation
time to full-duplex is also decreased.
SEK 2172
Hardware Description
Tool Description 16 10.99
4 Hardware Description
The ACE Demo Car-Kit hardware consists of two boards. The ACE Car-Kit Evaluation
Board and the Microcontroller Board with keys and display.
4.1 ACE Car-Kit Evaluation Board
4.1.1 List of Connectors
4.1.1.1 Microcontroller Connector JP1
Instead of using a PC for initializing the PSB2170 and PSB4851 a microcontroller is
used. All signals required for this purpose are available at pinhead J7. The connector is
located on the controller board at the same place.
4.1.1.2 IOM Connector J7
The SDI/IOM21) interface of the PSB2170 is available at pinhead J7. This interface is of
interest if a digital connection to one of the acoustic/line signals is available. The
PSB2170 is capable of processing 16 bit linear PCM data or 8 bit A/µ-law data with
different bit-clocks. For further details, please refer to the PSB2170 data sheet. The IOM
connetor is also available on the controller board, so that access is easy.
Table 4-1 Microcontroller Connector
pin signal purpose
1 SDX SCI-Interface, data from PSB2170/PSB4851
2 SDR SCI-Interface, data to PSB2170/PSB4851
3 SCLK SCI-Interface, bit-clock
4 CS SCI-Interface, chip-select for PSB2170/PSB4851
5 GND ground
6 RES reset (active-high) for PSB2170/PSB4851; see schematics
7 INT interrupt request from PSB2170; normally not needed
8 Vdd5 5.0V power supply (100 mA max.)
9 Vdd3V3 3.3V power supply (60 mA max.)
1) SDI: serial data interface; IOM: ISDN Oriented Modular (Interface); general purpose serial PCM interface for
data exchange; operates as slave and requires a 8kHz frame signal as well as a bit-clock
SEK 2172
Hardware Description
Tool Description 17 10.99
4.1.1.3 Analog Interface Connector P2
This is a SUB-D 9 Connector (female) which carries all four analog signals (in and out)
provided by the SAM-AFE. With this, the connection to the C25 is possible. All analog
signals are differential in order to obtain the best signal transmission performance. They
can be jumpered as single-ended signals. Refer to the description of Jumper JP2. For a
detailed description of signal levels and driving capability, please refer to the PSB4851
data sheet.
Figure 4-1 Pinout and Connections at the Analog Interface Connector P2
4.1.1.4 Loudspeaker Connector J12
A 3.5mm phone jack provides the output signal of the loudspeaker power amplifier. Note
that this is a differential output without reference to ground. The signal at the loudspeaker
connector is identical to the signal available at LSPO/LSNO but capable of driving a 4 Ω
load.
Table 4-2 IOM Connector
pin signal purpose
1 GND ground
2 DU data upstream; normally data output for the PSB2170
3 DD data downstream; normally data input for the PSB2170
4 DCL bit-clock up to 4.096 MHz (input)
5 FSC frame-sync 8 kHz (input)
1
P2
D-SUB 9
female
MIN2O
5
96
MIP1O
MIN1O
MIP2O
HONO
HOPO
to line/network
from microphone
from line/network
+
-
+
+
-
LSNO
LSPO
to loudspeaker
+
-
-
SEK 2172
Hardware Description
Tool Description 18 10.99
Note: The ACE CAR-KIT Evaluation Board is equipped with a stereo jack (L and R tied
together). Be careful when inserting 3.5mm mono plugs as this may cause a short
circuit.
Compare the description of jumper J14 and J9 as well. The integrated circuit for the
loudspeaker power amplifier is a TDA1519. It features short-circuit and over-
temperature protection. The power supply of approx. 12 Volts is taken directly from JP3.
4.1.1.5 Loudspeaker Connector J14
The pinhead J14 carries the output signal of the loudspeaker power amplifier. The signal
is identical to the one provided at J12 (see chapter 4.1.1.4).
Note: Do not place a jumper on J14 as this causes a short circuit of the power amplifier
4.1.1.6 Microphone Connector J11
A 3.5mm phone jack serves an input connector for an external microphone. Note that the
connector carries no ground signal. Because the board is equipped with a stereo
connector, it may be necessary to carefully check if a proper electrical connection is
possible with a mono plug. J11 is connected in parallel to the signals MIP2O/MIN2O; for
details refer to chapter 4.1.1.3. See description of jumper J10/J13.
4.1.1.7 12 V Power Supply Connector JP3
A car battery or any other DC source can be connected to JP3. The input voltage range
is 8...16 Volts. The current consumption with activated power amplifier is below 200 mA.
The current for driving an external load has to be considered separately. The input is
protected against reverse polarity. Using the 12 V supply requires J8 to be closed.
Table 4-3 12 V Power Supply Connector JP3
pin signal purpose
1 GND ground
2 VCC +12 Volts power supply; Note: J8 must be closed
SEK 2172
Hardware Description
Tool Description 19 10.99
4.1.1.8 5.0 V Power Supply Connector JP4
If only a 5.0 V supply is available and the power amplifier is not needed, the external
5.0 V power supply can be directly connected to JP4. In this case J8 must be open. The
tolerance for the 5.0 V supply is +/-5%.
4.1.2 List of Jumpers
4.1.2.1 Microphone Feeding J10, J13
The biasing for electret microphones which are connected directly to MIP2O/MIN2O are
activated by setting J10 and J13. The feeding resistors are R18/R28 (refer to schematic).
If MIP2O/MIN2O are not used for a microphone, the jumpers should be removed.
4.1.2.2 Selection of Single-Ended Inputs, JP2
Setting one or two jumpers on JP2 causes the analog inputs at connector P2 to work as
single-ended inputs. This is done by connecting a clean reference voltage directly to one
of the two differential input pins of the PSB4851. Figure 4-2 illustrates this. If such a
single-ended configuration is selected, the corresponding signal at connector JP2
(MIN1O or MIN2O) must remain open. The other signal (MIP1O or MIP2O) serves as
single-ended input.
Figure 4-2 How Jumper JP2 forces a single-ended input configuration
Table 4-4 5 V Power Supply Connector JP4
pin signal purpose
1 VDD5 +5.0 Volts power supply; Note: J8 must be open
2 GND ground
1
MIP1
MIN1
MIP2
MIN2
JP2
1
MIP1
VREF
MIP2
MIN2
JP2
1
MIP2
VREF
MIP1
MIN1
JP2
1
MIP1
VREF
JP2
MIP2
VREF
SEK 2172
Hardware Description
Tool Description 20 10.99
4.1.2.3 Enable Loudspeaker Power Amplifier, J9
If J9 is closed, the loudspeaker power amplifier (TDA1519) is operating. If J9 is left open,
the amplifier is powered down.
4.1.2.4 Power Supply 5 Volts, J8
If an external 5.0 V power supply is connected to JP4, J8 must be removed (compare
with schematics and see chapter 4.1.1.8.
SEK 2172
Hardware Description
Tool Description 21 10.99
4.1.3 Circuit Diagram of ACE Car-Kit Evaluation Board
SEK 2172
Hardware Description
Tool Description 22 10.99
4.1.4 Footprint of ACE Car-Kit Evaluation Board
SEK 2172
Hardware Description
Tool Description 23 10.99
4.2 Microcontroller Board
4.2.1 List of Connectors
4.2.1.1 IOM Connector JP3, JP4
The IOM connector JP4 is mounted at the bottom of the board to make a direct
connection to the ACE Car-Kit Evaluation Board possible. To make a connection to IOM
more easy, the signals are available at JP3. The IOM-signals are not used on the
microcontroller board. See Table 4-2 for pin assignment.
4.2.1.2 Digital Expansion Port Connector JP1
The expansion port connector is unused in ACE Demo Car-Kit. For further applications,
some controller port pins, 3.3 V, 5 V and ground are available at JP1. The pin
assignment can be seen in Table 4-5.
4.2.1.3 Analog Expansion Port Connector JP5, P2 and WJ1
The analog expansion port can be used by connecting either a handset (WJ1) or other
signal transducers (JP5) to the ACE Demo Car-Kit as a far end caller. If this is wanted,
the pins of P2 have to be connected with the corresponding pins of P2 at the ACE Car-
Kit Evaluation Board. Due to the signal level difference between the C25 and the
handset, the settings stored in the EPROM can not be used. It is possible to adjust the
SAM-AFE settings with external register access via V.24 interface.
4.2.1.4 V.24 Serial Interface P1
For external register access, the ACE Demo Car-Kit can be connected to a PC’s COM
port. The register software CP2170 can be used to read and write parameters of SAM-
Table 4-5 Digital Expansion Port JP1
pin signal purpose pin signal purpose
1VC5D 5 V 2GNDD ground
3V3 3.3 V 4PA3 port A.3
5PA4 port A.4 6PA5 port A.5
7PE0 port E.0 8PE1 port E.1
9PE2 port E.2 10 PE3 port E.3
11 PE4 port E.4 12 PE5 port E.5
13 PE6 port E.6 14 PE7 port E.7
SEK 2172
Hardware Description
Tool Description 24 10.99
AFE and ACE in physical and hexadeximal values. The pin assignment is described in
Table 4-6.
4.2.2 List of Jumpers
4.2.2.1 Background light J1
With J1, the background light of the display can be switched on.
Note: Adjust the display contrast with resistor R5.
Table 4-6 V.24 Serial Interface P1
pin signal purpose
2 RxD-C Controller Receive signal; Terminal Transmit signal
3 TxD-C Controller Transmit signal; Terminal Receive signal
5 GND ground
1,4,6..9 nc not connected
SEK 2172
Hardware Description
Tool Description 25 10.99
4.2.3 Circuit Diagram of Microcontroller Board
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
CAR-KIT uC-Board V1.0 1.0
Root
A
13Thursday, April 15, 1999
Infineon technologies AG i. Gr., AT AE LV
Title
Size Document Number Rev
Date: Sheet of
Serial
Serial Interface/AFE
TxD
RxD
Controller
Controller/Display
TDO
RDI
SEK 2172
Hardware Description
Tool Description 26 10.99
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
Header 9, female,
Samtec SSW
109-01-S-S,
mounted on LS
Header 7, female,
Samtec SSW
107-01-S-S,
mounted on LS
IOM-Interface
YAMAICHI
IC149-100-025-S5
n.m.
n.m.
CAR-KIT uC-Board V1.0 1.0
Controller / Display
C
23Wednesday, September 01, 1999
Infineon technologies AG i. Gr., AT AE LV
Title
Size Document Number Rev
Date: Sheet of
TDO
RDI
KeyCol0
KeyCol1
KeyCol2
EpA0
EpA1
EpA2
EpA3
EpA4
EpA5
EpA6
EpA7
EpA8
EpA9
EpA10
EpA11
EpA12
EpA13
EpA14
EpA15
EpA16
EpA17
EpCE
EpOE
EpD0
EpD1
EpD2
EpD3
EpD4
EpD5
EpD6
EpD7
SCI2
SCI1
SCI0
SCI3
RESALL
INTQ
EpA18
DU
DD
DCL
FSC
PA3
PA5
PE1
PE3
PE5
PA4
PE0
PE2
PE4
PE6
LcdCS
IRQ
EpA18
LcdA0
EpA1
EpD3
LcdD6
EpA0
SCI1
RDI
PA3
KeyRow2
EpA14
EpA12
PE4
LcdD7
LcdWR
EpA5
EpA16
KeyCol2
KeyRow1
EpA8
EpD7
PE1
EpA15
EpD0
PE5
LcdD4
EpD2
EpD1
KeyCol0
EpA10
EpA3
PA4
KeyRow0
PE6
TDO
INTQ LcdD5
ResetQ
EpA4
EpD6
PE2
SCI2
PA5
KeyRow0
KeyRow2
EpA13
EpD5
SCI3
SCI0
KeyRow1
EpA7
EpCE
EpA6
EpA2
PE7
EpA11
EpA9
EpD4
EpOE
EpA17
KeyCol1
LcdRES
RESALL
DTMF
PE3
PE0
PE7ResetQ
GNDD
VC5D
VC5D
VC5D
VC5D
V3
GNDD
V3
GNDD
V3 GNDD
V3
VC5D
GNDD
V3
V5V
VC5A VC5D
GNDD
V5V
GNDA
GNDD
GNDD
GNDD
GNDD
VC5D
V3
GNDD
GNDD
GNDD
VC5D
GNDD
GNDD
VC5D
GNDD
GNDD
VC5D
GNDD
GNDDGNDD
GNDD
Y1
3,579MHz
Y2
32,768kHz
TA1 TA2 TA3
TA6
TA9
R5
500k
J1
JUMPER
2 1
ZIF1
ZIF-Connector
RP1
10k
3
4
5
6
7
8
9
12
R11
100k
R12
100k
R13
100k
JP2
HEADER 9
1
2
3
4
5
6
7
8
9
JP4
HEADER 7
1
2
3
4
5
6
7
JP3
HEADER 7
1
2
3
4
5
6
7
+
C12
47u/10V
+
C11
10u/20V
+
C6
10u/20V
C5
100n
R18
470k
R15
100R
R6
360k
R4
470k
R2
33R
R1
100k
+
C3
1u/20V
SO2
DIL-32 Socket
SO1
QFP-100-0.5mm Socket
R3
n.m.
R9
100k
C4
100n
LCD1 TCM-A0804-3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A0
WR#
CS#
D7
D6
D5
D4
D3
D2
D1
D0
VDD
VSS
V5
VR
P/S
IF
RES
LED+
LED-
JP1
HEADER 7X2
12
34
56
78
910
11 12
13 14
R10
100k
R20
n.m.
R8
100k
R1410M
R7
100k
R17
n.m.
R16 100k
R19
10k
IC1
68HC705F32-100
1
92
93
94
95
96
97
98
99
78
79
80
81
82
83
84
85
19
20
21
22
23
26
27
28
2
3
4
5
6
7
8
9
77
11
12
13
14
15
16
17
18
91
90
89
29
30
10
54
55
56
57
58
59
60
61
24
87
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
66
67
68
69
70
71
72
73
74
75
62
63
64
65
76
86
34
35
36
37
31
32
33
25
88
100
AVDD
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0/TCAP3
PC1/TCAP4
PC2/RDI
PC3/TDO
PC4/MISO
PC5/MOSI
PC6/SCK
PC7/SS
PD0/AN0
PD1/AN1
PD2/AN2
PD3/AN3
PD4/AN4
PD5/AN5
PD6/AN6
PD7/AN7
PH7/FP39
PE0/TCAP1
PE1/TCMP1
PE2/TCAP2
PE3/TCMP2
PE4/refresh
PE5/PWM1
PE6/PWM2
PE7/PWM3
OSC1
OSC2
IRQ
OSC3
OSC4
AVSS
PF0/FP16
PF1/FP17
PF2/FP18
PF3/FP19
PF4/FP20
PF5/FP21
PF6/FP22
PF7/FP23
VDD
VDD
PJ0/FP0
PJ1/FP1
PJ2/FP2
PJ3/FP3
PJ4/FP4
PJ5/FP5
PJ6/FP6
PJ7/FP7
PI0/FP8
PI1/FP9
PI2/FP10
PI3/FP11
PI4/FP12
PI5/FP13
PI6/FP14
PI7/FP15
PG0/FP24
PG1/FP25
PG2/FP26
PG3/FP27
PG4/FP28
PG5/FP29
PG6/FP30
PG7/FP31
PH0/FP32
PH1/FP33
PH2/FP34
PH3/FP35
PH4/FP36
PH5/FP37
PH6/FP38
RESET
BP0
BP1
BP2
BP3
TNX
TNO
VLCD
VSS
VSS
Vrh
C13
100n
+
C2
10u/20V
C9
33p
C10
33p
C7
10p
C8
10p
IC2
AM27C020
12
11
10
9
8
7
6
5
27
26
23
25
4
28
29
3
2
30
22
24
31
1
13
14
15
17
18
19
20
21
32
16
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
CE
OE
PGM
VPP
D0
D1
D2
D3
D4
D5
D6
D7
VCC
GND
SC2
Short circuit
12
SC1
Short circuit
12
C1
100n
TA4
TA7
TA5
TA8
R23
100
S1
SW DPDT, Push Button
TDO
RDI
SEK 2172
Hardware Description
Tool Description 27 10.99
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
CAR-KIT uC-Board V1.0 1.0
Serial Interface/AFE
A
33Thursday, April 15, 1999
Infineon Technologies AG, AT AE
Title
Size Document Number Rev
Date: Sheet of
RxD-C
TxD-C
MIP1O
HOPO
HONO
MIN1O
GNDA
GNDD
GNDA
GNDD
GNDD
GNDD
GNDA
VC5D
VC5D
VC5A
VC5D
IC3
MAX 202E
15
8
13
14
7
2
6
16
9
12
11
10
5
4
3
1
GND
R2in
R1in
T1out
T2out
V+
V-
VCC
R2out
R1out
T1in
T2in
C2-
C2+
C1-
C1+
R22
3k3
+
C19
47u/16V
C15
100n
P2
SUB-D9 female, n.m.
5
9
4
8
3
7
2
6
1
C16
100n
P1
DSUB 9, male
5
9
4
8
3
7
2
6
1
C14
100n
R21
330R
C18 100n
C17 100n
C20 220n
JP5
HEADER 5
1
2
3
4
5
C21 220n
WJ1
Western Jack 4
1
2
3
4
RxD
TxD
SEK 2172
Hardware Description
Tool Description 28 10.99
4.2.4 Footprint of Microcontroller Board
