Siemens AC75 User manual

Hardware Interface Descri
p
tion
AC75
Siemens Cellular Engine
Version: 00.202
DocID: AC75_HD_V00.202
s

AC75 Hardware Interface Description
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Document Name: AC75 Hardware Interface Description
Version: 00.202
Date: April 27, 2006
DocId: AC75_HD_V00.202
Status: Strictly confidential / Preliminary
General note
Product is deemed accepted by Recipient and is provided without interface to Recipient´s products.
The Product constitutes pre-release version and code and may be changed substantially before
commercial release. The Product is provided on an “as is” basis only and may contain deficiencies or
inadequacies. The Product is provided without warranty of any kind, express or implied. To the
maximum extent permitted by applicable law, Siemens further disclaims all warranties, including
without limitation any implied warranties of merchantability, fitness for a particular purpose and
noninfringement of third-party rights. The entire risk arising out of the use or performance of the
Product and documentation remains with Recipient. This Product is not intended for use in life support
appliances, devices or systems where a malfunction of the product can reasonably be expected to
result in personal injury. Applications incorporating the described product must be designed to be in
accordance with the technical specifications provided in these guidelines. Failure to comply with any
of the required procedures can result in malfunctions or serious discrepancies in results. Furthermore,
all safety instructions regarding the use of mobile technical systems, including GSM products, which
also apply to cellular phones must be followed. Siemens AG customers using or selling this product
for use in any applications do so at their own risk and agree to fully indemnify Siemens for any
damages resulting from illegal use or resale. To the maximum extent permitted by applicable law, in
no event shall Siemens or its suppliers be liable for any consequential, incidental, direct, indirect,
punitive or other damages whatsoever (including, without limitation, damages for loss of business
profits, business interruption, loss of business information or data, or other pecuniary loss) arising out
the use of or inability to use the Product, even if Siemens has been advised of the possibility of such
damages. Subject to change without notice at any time.
Copyright
Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its
contents and communication thereof to others without express authorization are prohibited. Offenders
will be held liable for payment of damages. All rights created by patent grant or registration of a utility
model or design patent are reserved.
Copyright © Siemens AG 2006

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Contents
0Document History.........................................................................................................7
1Introduction...................................................................................................................8
1.1 Related Documents ...............................................................................................8
1.2 Terms and Abbreviations.......................................................................................9
1.3 Type Approval......................................................................................................12
1.4 Safety Precautions...............................................................................................14
2Product Concept.........................................................................................................16
2.1 Key Features at a Glance ....................................................................................16
2.2 AC75 System Overview.......................................................................................19
2.3 Circuit Concept ....................................................................................................20
3Application Interface...................................................................................................21
3.1 Operating Modes .................................................................................................22
3.2 Power Supply.......................................................................................................24
3.2.1 Minimizing Power Losses ......................................................................24
3.2.2 Measuring the Supply Voltage VBATT+ ....................................................25
3.2.3 Monitoring Power Supply by AT Command ...........................................25
3.3 Power-Up / Power-Down Scenarios ....................................................................26
3.3.1 Turn on AC75.........................................................................................26
3.3.1.1 Turn on AC75 Using Ignition Line IGT ...................................................26
3.3.1.2 Configuring the IGT Line for Use as ON/OFF Switch ............................29
3.3.1.3 Turn on AC75 Using the VCHARGE Signal...........................................30
3.3.1.4 Reset AC75 via AT+CFUN Command...................................................30
3.3.1.5 Reset or Turn off AC75 in Case of Emergency......................................31
3.3.1.6 Using EMERG_RST Signal to Reset Application(s) or External Device(s)
...............................................................................................................31
3.3.2 Signal States after Startup.....................................................................32
3.3.3 Turn off AC75.........................................................................................34
3.3.3.1 Turn off AC75 Using AT Command .......................................................34
3.3.3.2 Leakage Current in Power-Down Mode.................................................35
3.3.3.3 Turn on/off AC75 Applications with Integrated USB ..............................36
3.3.4 Automatic Shutdown ..............................................................................37
3.3.4.1 Thermal Shutdown.................................................................................37
3.3.4.2 Deferred Shutdown at Extreme Temperature Conditions ......................38
3.3.4.3 Monitoring the Board Temperature of AC75 ..........................................38
3.3.4.4 Undervoltage Shutdown if Battery NTC is Present ................................38
3.3.4.5 Undervoltage Shutdown if no Battery NTC is Present ...........................39
3.3.4.6 Overvoltage Shutdown...........................................................................39
3.4 Automatic EGPRS/GPRS Multislot Class Change ..............................................40
3.5 Charging Control..................................................................................................41
3.5.1 Hardware Requirements ........................................................................41
3.5.2 Software Requirements .........................................................................41
3.5.3 Battery Pack Requirements ...................................................................42
3.5.4 Batteries Recommended for Use with AC75 .........................................43
3.5.5 Charger Requirements...........................................................................44
3.5.6 Implemented Charging Technique.........................................................44
3.5.7 Operating Modes during Charging.........................................................45
3.6 Power Saving.......................................................................................................47
3.6.1 Network Dependency of SLEEP Modes ................................................47
3.6.2 Timing of the CTSx Signal in CYCLIC SLEEP Mode 7..........................48
3.6.3 Timing of the RTSx Signal in CYCLIC SLEEP Mode 9..........................48

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3.7 Summary of State Transitions (Except SLEEP Mode).........................................49
3.8 RTC Backup ........................................................................................................50
3.9 SIM Interface .......................................................................................................51
3.9.1 Installation Advice..................................................................................52
3.10 Serial Interface ASC0 ..........................................................................................53
3.11 Serial Interface ASC1 ..........................................................................................55
3.12 USB Interface ......................................................................................................56
3.12.1 Installing the USB Modem Driver...........................................................57
3.13 I2C Interface .........................................................................................................59
3.14 SPI Interface ........................................................................................................61
3.15 Audio Interfaces...................................................................................................63
3.15.1 Speech Processing................................................................................64
3.15.2 Microphone Circuit.................................................................................64
3.15.2.1 Single-ended Microphone Input.............................................................65
3.15.2.2 Differential Microphone Input.................................................................66
3.15.2.3 Line Input Configuration with OpAmp ....................................................67
3.15.3 Loudspeaker Circuit...............................................................................68
3.15.4 Digital Audio Interface (DAI) ..................................................................69
3.15.4.1 Master Mode ..........................................................................................70
3.15.4.2 Slave Mode ............................................................................................72
3.16 GPIO Interface.....................................................................................................74
3.16.1 Using the GPIO10 Pin as Pulse Counter ...............................................74
3.17 Control Signals ....................................................................................................75
3.17.1 Synchronization Signal ..........................................................................75
3.17.2 Using the SYNC Pin to Control a Status LED........................................76
3.17.3 Behavior of the RING0 Line (ASC0 Interface only)................................77
3.17.4 PWR_IND Signal ...................................................................................77
4Antenna Interface........................................................................................................78
4.1 Antenna Diagnostic..............................................................................................79
4.2 Antenna Connector..............................................................................................80
5Electrical, Reliability and Radio Characteristics......................................................82
5.1 Absolute Maximum Ratings .................................................................................82
5.2 Operating Temperatures......................................................................................83
5.3 Storage Conditions ..............................................................................................84
5.4 Reliability Characteristics.....................................................................................85
5.5 Pin Assignment and Signal Description...............................................................86
5.6 Power Supply Ratings .........................................................................................93
5.7 Electrical Characteristics of the Voiceband Part..................................................96
5.7.1 Setting Audio Parameters by AT Commands ........................................96
5.7.2 Audio Programming Model ....................................................................97
5.7.3 Characteristics of Audio Modes .............................................................98
5.7.4 Voiceband Receive Path........................................................................99
5.7.5 Voiceband Transmit Path.....................................................................100
5.8 Air Interface .......................................................................................................101
5.9 Electrostatic Discharge ......................................................................................102
6Mechanics..................................................................................................................103
6.1 Mechanical Dimensions of AC75.......................................................................103
6.2 Mounting AC75 to the Application Platform .......................................................105
6.3 Board-to-Board Application Connector ..............................................................106
7Sample Application...................................................................................................109

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8Reference Approval..................................................................................................111
8.1 Reference Equipment for Type Approval...........................................................111
8.2 Compliance with FCC Rules and Regulations...................................................112
9Appendix....................................................................................................................113
9.1 List of Parts and Accessories ............................................................................113
9.2 Fasteners and Fixings for Electronic Equipment ...............................................115
9.2.1 Fasteners from German Supplier ETTINGER GmbH ..........................115
9.3 Data Sheets of Recommended Batteries ..........................................................118
Tables
Table 1: Directives..................................................................................................................12
Table 2: Standards of North American type approval ............................................................12
Table 3: Standards of European type approval......................................................................13
Table 4: Requirements of quality............................................................................................13
Table 5: Overview of operating modes...................................................................................22
Table 6: Signal states.............................................................................................................32
Table 7: Temperature dependent behavior ............................................................................38
Table 8: Specifications of battery packs suitable for use with AC75 ......................................43
Table 9: AT commands available in Charge-only mode.........................................................45
Table 10: Comparison Charge-only and Charge mode..........................................................46
Table 11: State transitions of AC75 (except SLEEP mode) ................................................... 49
Table 12: Signals of the SIM interface (board-to-board connector) ....................................... 51
Table 13: DCE-DTE wiring of ASC0.......................................................................................54
Table 14: DCE-DTE wiring of ASC1.......................................................................................55
Table 15: Configuration combinations for the PCM interface................................................. 69
Table 16: Overview of DAI pin functions ................................................................................70
Table 17: Return loss in the active band ................................................................................78
Table 18: Values of the AT^SAD parameter <diag> and their meaning.................................79
Table 19: Product specifications of Rosenberger SMP connector ......................................... 80
Table 20: Absolute maximum ratings ..................................................................................... 82
Table 21: Board temperature .................................................................................................83
Table 22: Ambient temperature according to IEC 60068-2 (without forced air circulation) .... 83
Table 23: Charging temperature ............................................................................................83
Table 24: Storage conditions..................................................................................................84
Table 25: Summary of reliability test conditions .....................................................................85
Table 26: Signal description...................................................................................................87
Table 27: Power supply ratings ..............................................................................................93
Table 28: Current consumption during Tx burst for GSM 850MHz and GSM 900MHz.......... 94
Table 29: Current consumption during Tx burst for GSM 1800MHz and GSM 1900MHz...... 95
Table 30: Audio parameters adjustable by AT command ......................................................96
Table 31: Voiceband characteristics (typical).........................................................................98
Table 32: Voiceband receive path..........................................................................................99
Table 33: Voiceband transmit path.......................................................................................100
Table 34: Air Interface ..........................................................................................................101
Table 35: Measured electrostatic values..............................................................................102
Table 36: Technical specifications of Molex board-to-board connector ............................... 106
Table 37: List of parts and accessories................................................................................113
Table 38: Molex sales contacts (subject to change) ............................................................114

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Figures
Figure 1: AC75 system overview............................................................................................19
Figure 2: AC75 block diagram................................................................................................20
Figure 3: Power supply limits during transmit burst................................................................ 25
Figure 4: Position of the reference points BATT+ and GND ..................................................25
Figure 5: Power-on with operating voltage at BATT+ applied before activating IGT.............. 27
Figure 6: Power-on with IGT held low before switching on operating voltage at BATT+ ....... 28
Figure 7: Timing of IGT if used as ON/OFF switch ................................................................29
Figure 8: Signal states during turn-off procedure ...................................................................35
Figure 9: Battery pack circuit diagram....................................................................................42
Figure 10: Power saving and paging......................................................................................47
Figure 11: Timing of CTSx signal (if CFUN= 7)......................................................................48
Figure 12: Timing of RTSx signal (if CFUN = 9).....................................................................48
Figure 13: RTC supply from capacitor.................................................................................... 50
Figure 14: RTC supply from rechargeable battery .................................................................50
Figure 15: RTC supply from non-chargeable battery .............................................................50
Figure 16: Serial interface ASC0............................................................................................53
Figure 17: Serial interface ASC1............................................................................................55
Figure 18: USB circuit ............................................................................................................56
Figure 19: I2C interface connected to VCC of application .....................................................59
Figure 20: I2C interface connected to VEXT line of AC75 .....................................................60
Figure 21: SPI interface..........................................................................................................61
Figure 22: Characteristics of SPI modes................................................................................62
Figure 23: Audio block diagram..............................................................................................63
Figure 24: Single ended microphone input.............................................................................65
Figure 25: Differential microphone input ................................................................................66
Figure 26: Line input configuration with OpAmp .................................................................... 67
Figure 27: Differential loudspeaker configuration................................................................... 68
Figure 28: Master PCM interface Application.........................................................................70
Figure 29: Short Frame PCM timing.......................................................................................71
Figure 30: Long Frame PCM timing .......................................................................................71
Figure 31: Slave PCM interface application ........................................................................... 72
Figure 32: Slave PCM Timing, Short Frame selected ............................................................73
Figure 33: Slave PCM Timing, Long Frame selected.............................................................73
Figure 34: SYNC signal during transmit burst ........................................................................75
Figure 35: LED Circuit (Example)...........................................................................................76
Figure 36: Incoming voice/fax/data call ..................................................................................77
Figure 37: URC transmission .................................................................................................77
Figure 38: Resistor measurement used for antenna detection .............................................. 79
Figure 39: Datasheet of Rosenberger SMP MIL-Std 348-A connector ..................................81
Figure 40: Pin assignment (component side of AC75)...........................................................86
Figure 41: Audio programming model ....................................................................................97
Figure 42: AC75 – top view ..................................................................................................103
Figure 43: Dimensions of AC75 ...........................................................................................104
Figure 44: Molex board-to-board connector 52991-0808 on AC75...................................... 107
Figure 45: Mating board-to-board connector 53748-0808 on application ............................108
Figure 46: AC75 sample application for Java....................................................................... 110
Figure 47: Reference equipment for Type Approval ............................................................111
Figure 48: Lithium Ion battery from VARTA .........................................................................119
Figure 49: VARTA PoLiFlex® Lithium Polymer battery........................................................120

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0 Document History
Preceding document: "AC75 Hardware Interface Description" Version 00.020
New document: "AC75 Hardware Interface Description" Version 00.202
Chapter What is new
3.3.2 New chapter: Signal States after Startup.
3.3.1.1 More detailed description of IGT timing depending on Power-down or Charge-only
mode.
Added further details on timing after power-up.
Added alert message “SHUTDOWN after Illegal PowerUp”
3.3.1.2 New chapter: Configuring the IGT Line for Use as ON/OFF Switch
3.3.4.1 Revised Table 7: Temperature dependent behavior.
3.3.4.2,
3.3.4.3
Replaced resp. new sections on Deferred Shutdown at Extreme Temperature
Conditions and Monitoring the Board Temperature of AC75.
3.4 Minor text change.
3.3.1.3,
3.5.7, 3.7
To change from Charge-only mode to Normal mode the IGT line must be pulled low
for at least 1s and then released. High state of IGT lets AC75 enter Normal mode.
3.5.4 Replaced recommended polymer battery with new VARTA PoLiFlex® battery
3.5.7, 3.7 Described transition from Charge-only to Normal mode by switching off Airplane
mode.
3.6 Added chapter on power saving.
3.12 AC75 does not support generic USB 2.0 High Speed hubs.
3.15.2.2 Added remarks on VMIC behaviour.
3.15.2.3 Replaced remark on VMIC behaviour.
3.15.4 Added Table 15: Configuration combinations for the PCM interface
5.1 New maximum values for voltage at analog pins with VMIC on/off.
5.2 Specified operating board temperature.
Table 22: Temperature specified for charging is battery temperature (not ambient)
5.5 Specified internal pull-down resistors 330kΩat TXD0, RXD0, TXD1, RXD1. Changed
all VIHmin values from 2.0 to 2.15V.
Corrected overview table: USB_DP was listed in wrong row.
5.7 New chapter: Electrical Characteristics of the Voiceband Part
7 Modified description for Java “System.out” in sample application.
9.3 New datasheet for recommended VARTA PoLiFlex® Lithium polymer battery.

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1 Introduction
This document describes the hardware of the Siemens AC75 module that connects to the
cellular device application and the air interface. It helps you quickly retrieve interface
specifications, electrical and mechanical details and information on the requirements to be
considered for integrating further components.
1.1 Related Documents
[1] AC75 AT Command Set 00.202
[2] AC75 Release Notes 00.202
[3] DSB75 Support Box - Evaluation Kit for Siemens Cellular Engines
[4] Application 07: Rechargeable Lithium Batteries in GSM Applications
[5] Multiplexer User's Guide
[6] Multiplex Driver Developer’s Guide for Windows 2000 and Windows XP
[7] Multiplex Driver Installation Guide for Windows 2000 and Windows XP
[8] AC75 Java User’s Guide
[9] Java doc \wtk\doc\html\index.html
[10] Application Note 24: Application Developer’s Guide

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1.2 Terms and Abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
AGC Automatic Gain Control
ANSI American National Standards Institute
ARFCN Absolute Radio Frequency Channel Number
ARP Antenna Reference Point
ASC0 / ASC1 Asynchronous Controller. Abbreviations used for first and second serial interface of
AC75
B Thermistor Constant
B2B Board-to-board connector
BER Bit Error Rate
BTS Base Transceiver Station
CB or CBM Cell Broadcast Message
CE Conformité Européene (European Conformity)
CHAP Challenge Handshake Authentication Protocol
CPU Central Processing Unit
CS Coding Scheme
CSD Circuit Switched Data
CTS Clear to Send
DAC Digital-to-Analog Converter
DAI Digital Audio Interface
dBm0 Digital level, 3.14dBm0 corresponds to full scale, see ITU G.711, A-law
DCE Data Communication Equipment (typically modems, e.g. Siemens GSM engine)
DCS 1800 Digital Cellular System, also referred to as PCN
DRX Discontinuous Reception
DSB Development Support Box
DSP Digital Signal Processor
DSR Data Set Ready
DTE Data Terminal Equipment (typically computer, terminal, printer or, for example, GSM
application)
DTR Data Terminal Ready
DTX Discontinuous Transmission
EFR Enhanced Full Rate
EGSM Enhanced GSM
EIRP Equivalent Isotropic Radiated Power
EMC Electromagnetic Compatibility
ERP Effective Radiated Power

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Abbreviation Description
ESD Electrostatic Discharge
ETS European Telecommunication Standard
FCC Federal Communications Commission (U.S.)
FDMA Frequency Division Multiple Access
FR Full Rate
GMSK Gaussian Minimum Shift Keying
GPIO General Purpose Input/Output
GPRS General Packet Radio Service
GSM Global Standard for Mobile Communications
HiZ High Impedance
HR Half Rate
I/O Input/Output
IC Integrated Circuit
IMEI International Mobile Equipment Identity
ISO International Standards Organization
ITU International Telecommunications Union
kbps kbits per second
LED Light Emitting Diode
Li-Ion / Li+ Lithium-Ion
Li battery Rechargeable Lithium Ion or Lithium Polymer battery
Mbps Mbits per second
MMI Man Machine Interface
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
MSISDN Mobile Station International ISDN number
MT Mobile Terminated
NTC Negative Temperature Coefficient
OEM Original Equipment Manufacturer
PA Power Amplifier
PAP Password Authentication Protocol
PBCCH Packet Switched Broadcast Control Channel
PCB Printed Circuit Board
PCL Power Control Level
PCM Pulse Code Modulation
PCN Personal Communications Network, also referred to as DCS 1800
PCS Personal Communication System, also referred to as GSM 1900
PDU Protocol Data Unit
PLL Phase Locked Loop

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Abbreviation Description
PPP Point-to-point protocol
PSK Phase Shift Keying
PSU Power Supply Unit
R&TTE Radio and Telecommunication Terminal Equipment
RAM Random Access Memory
RF Radio Frequency
RMS Root Mean Square (value)
ROM Read-only Memory
RTC Real Time Clock
RTS Request to Send
Rx Receive Direction
SAR Specific Absorption Rate
SELV Safety Extra Low Voltage
SIM Subscriber Identification Module
SMS Short Message Service
SPI Serial Peripheral Interface
SRAM Static Random Access Memory
TA Terminal adapter (e.g. GSM engine)
TDMA Time Division Multiple Access
TE Terminal Equipment, also referred to as DTE
Tx Transmit Direction
UART Universal asynchronous receiver-transmitter
URC Unsolicited Result Code
USB Universal Serial Bus
USSD Unstructured Supplementary Service Data
VSWR Voltage Standing Wave Ratio
Phonebook abbreviations
FD SIM fixdialing phonebook
LD SIM last dialing phonebook (list of numbers most recently dialed)
MC Mobile Equipment list of unanswered MT calls (missed calls)
ME Mobile Equipment phonebook
ON Own numbers (MSISDNs) stored on SIM or ME
RC Mobile Equipment list of received calls
SM SIM phonebook

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1.3 Type Approval
AC75 is designed to comply with the directives and standards listed below. Please note that
the product is still in a pre-release state and, therefore, type approval and testing procedures
have not yet been completed.
Table 1: Directives
99/05/EC Directive of the European Parliament and of the council of 9
March 1999 on radio equipment and telecommunications terminal
equipment and the mutual recognition of their conformity (in short
referred to as R&TTE Directive 1999/5/EC).
The product is labeled with the CE conformity mark
89/336/EC Directive on electromagnetic compatibility
73/23/EC Directive on electrical equipment designed for use within certain
voltage limits (Low Voltage Directive)
95/94/EC Automotive EMC directive
2002/95/EC Directive of the European Parliament and of the
Council of 27 January 2003 on the restriction of the
use of certain hazardous substances in electrical
and electronic equipment (RoHS)
Table 2: Standards of North American type approval
CFR Title 47 Code of Federal Regulations, Part 22 and Part 24 (Telecommuni-
cations, PCS); US Equipment Authorization FCC
UL 60 950 Product Safety Certification (Safety requirements)
NAPRD.03 V3.1.2 Overview of PCS Type certification review board Mobile
Equipment Type Certification and IMEI control
PCS Type Certification Review board (PTCRB)
RSS133 (Issue2) Canadian Standard

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Table 3: Standards of European type approval
3GPP TS 51.010-1 Digital cellular telecommunications system (Phase 2); Mobile
Station (MS) conformance specification
ETSI EN 301 511
V9.0.2
Candidate Harmonized European Standard (Telecommunications
series) Global System for Mobile communications (GSM);
Harmonized standard for mobile stations in the GSM 900 and
DCS 1800 bands covering essential requirements under article
3.2 of the R&TTE directive (1999/5/EC) (GSM 13.11 version 7.0.1
Release 1998)
GCF-CC V3.16.0 Global Certification Forum - Certification Criteria
ETSI EN 301 489-1
V1.4.1
Candidate Harmonized European Standard (Telecommunications
series) Electro Magnetic Compatibility and Radio spectrum Matters
(ERM); Electro Magnetic Compatibility (EMC) standard for radio
equipment and services; Part 1: Common Technical Requirements
ETSI EN 301 489-7
V1.2.1 (2000-09)
Candidate Harmonized European Standard (Telecommunications
series) Electro Magnetic Compatibility and Radio spectrum
Matters (ERM); Electro Magnetic Compatibility (EMC) standard for
radio equipment and services; Part 7: Specific conditions for
mobile and portable radio and ancillary equipment of digital
cellular radio telecommunications systems (GSM and DCS)
IEC/EN 60950-1
(2001)
Safety of information technology equipment (2000)
Table 4: Requirements of quality
IEC 60068 Environmental testing
DIN EN 60529 IP codes

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SAR requirements specific to portable mobiles
Mobile phones, PDAs or other portable transmitters and receivers incorporating a GSM
module must be in accordance with the guidelines for human exposure to radio frequency
energy. This requires the Specific Absorption Rate (SAR) of portable AC75 based
applications to be evaluated and approved for compliance with national and/or international
regulations.
Since the SAR value varies significantly with the individual product design manufacturers are
advised to submit their product for approval if designed for portable use. For European and
US markets the relevant directives are mentioned below. It is the responsibility of the
manufacturer of the final product to verify whether or not further standards, recommendations
or directives are in force outside these areas.
Products intended for sale on US markets
ES 59005/ANSI C95.1 Considerations for evaluation of human exposure to
Electromagnetic Fields (EMFs) from Mobile Telecommunication
Equipment (MTE) in the frequency range 30MHz - 6GHz
Products intended for sale on European markets
EN 50360 Product standard to demonstrate the compliance of mobile phones
with the basic restrictions related to human exposure to
electromagnetic fields (300MHz - 3GHz)
1.4 Safety Precautions
The following safety precautions must be observed during all phases of the operation, usage,
service or repair of any cellular terminal or mobile incorporating AC75. Manufacturers of the
cellular terminal are advised to convey the following safety information to users and
operating personnel and to incorporate these guidelines into all manuals supplied with the
product. Failure to comply with these precautions violates safety standards of design,
manufacture and intended use of the product. Siemens AG assumes no liability for
customer’s failure to comply with these precautions.
When in a hospital or other health care facility, observe the restrictions on the
use of mobiles. Switch the cellular terminal or mobile off, if instructed to do so
by the guidelines posted in sensitive areas. Medical equipment may be
sensitive to RF energy.
The operation of cardiac pacemakers, other implanted medical equipment
and hearing aids can be affected by interference from cellular terminals or
mobiles placed close to the device. If in doubt about potential danger, contact
the physician or the manufacturer of the device to verify that the equipment is
properly shielded. Pacemaker patients are advised to keep their hand-held
mobile away from the pacemaker, while it is on.
Switch off the cellular terminal or mobile before boarding an aircraft. Make
sure it cannot be switched on inadvertently. The operation of wireless
appliances in an aircraft is forbidden to prevent interference with
communications systems. Failure to observe these instructions may lead to
the suspension or denial of cellular services to the offender, legal action, or
both.

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SOS
Do not operate the cellular terminal or mobile in the presence of flammable
gases or fumes. Switch off the cellular terminal when you are near petrol
stations, fuel depots, chemical plants or where blasting operations are in
progress. Operation of any electrical equipment in potentially explosive
atmospheres can constitute a safety hazard.
Your cellular terminal or mobile receives and transmits radio frequency
energy while switched on. Remember that interference can occur if it is used
close to TV sets, radios, computers or inadequately shielded equipment.
Follow any special regulations and always switch off the cellular terminal or
mobile wherever forbidden, or when you suspect that it may cause
interference or danger.
Road safety comes first! Do not use a hand-held cellular terminal or mobile
when driving a vehicle, unless it is securely mounted in a holder for
speakerphone operation. Before making a call with a hand-held terminal or
mobile, park the vehicle.
Speakerphones must be installed by qualified personnel. Faulty installation or
operation can constitute a safety hazard.
IMPORTANT!
Cellular terminals or mobiles operate using radio signals and cellular
networks. Because of this, connection cannot be guaranteed at all times
under all conditions. Therefore, you should never rely solely upon any
wireless device for essential communications, for example emergency calls.
Remember, in order to make or receive calls, the cellular terminal or mobile
must be switched on and in a service area with adequate cellular signal
strength.
Some networks do not allow for emergency calls if certain network services or
phone features are in use (e.g. lock functions, fixed dialing etc.). You may
need to deactivate those features before you can make an emergency call.
Some networks require that a valid SIM card be properly inserted in the
cellular terminal or mobile.

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2 Product Concept
2.1 Key Features at a Glance
Feature Implementation
General
Frequency bands Quad band: GSM 850/900/1800/1900MHz
GSM class Small MS
Output power
(according to
Release 99, V5)
Class 4 (+33dBm ±2dB) for EGSM850
Class 4 (+33dBm ±2dB) for EGSM900
Class 1 (+30dBm ±2dB) for GSM1800
Class 1 (+30dBm ±2dB) for GSM1900
Class E2 (+27dBm ± 3dB) for GSM 850 8-PSK
Class E2 (+27dBm ± 3dB) for GSM 900 8-PSK
Class E2 (+26dBm +3 /-4dB) for GSM 1800 8-PSK
Class E2 (+26dBm +3 /-4dB) for GSM 1900 8-PSK
The values stated above are maximum limits. According to
Release 99, Version 5, the maximum output power in a multislot
configuration may be lower. The nominal reduction of maximum
output power varies with the number of uplink timeslots used and
amounts to 3.0dB for 2Tx, 4.8dB for 3Tx and 6.0dB for 4Tx.
Power supply 3.3V to 4.5V
Ambient operating
temperature according
to IEC 60068-2
Normal operation -30°C to +75°C
Restricted operation -30°C / +85°C
Physical Dimensions: 33.9mm x 55mm x max. 4mm
Weight: approx. 8.5g
RoHS All hardware components fully compliant with EU RoHS Directive
GSM / GPRS / EGPRS features
Data transfer GPRS
•Multislot Class 12
•Full PBCCH support
•Mobile Station Class B
•Coding Scheme 1 – 4
EGPRS
•Multislot Class 10
•Mobile Station Class B
•Modulation and Coding Scheme MCS 1 – 9
CSD
•V.110, RLP, non-transparent
•2.4, 4.8, 9.6, 14.4kbps
•USSD
PPP-stack for GPRS data transfer

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Feature Implementation
SMS •Point-to-point MT and MO
•Cell broadcast
•Text and PDU mode
•Storage: SIM card plus 25 SMS locations in mobile equipment
•Transmission of SMS alternatively over CSD or GPRS.
Preferred mode can be user defined.
Fax Group 3; Class 1
Audio Speech codecs:
•Half rate HR (ETS 06.20)
•Full rate FR (ETS 06.10)
•Enhanced full rate EFR (ETS 06.50/06.60/06.80)
•Adaptive Multi Rate AMR
Speakerphone operation (VDA), echo cancellation, noise
suppression, DTMF, 7 ringing tones
Software
AT commands AT-Hayes GSM 07.05 and 07.07, Siemens
AT commands for RIL compatibility (NDIS/RIL)
MicrosoftTM compatibility RIL / NDIS for Pocket PC and Smartphone
Java platform
JDK Version: 1.4.2_09
Java Virtual Machine with APIs for AT Parser, Serial Interface,
FlashFileSystem and TCP/IP Stack.
Major benefits: seamless integration into Java applications, ease
of programming, no need for application microcontroller,
extremely cost-efficient hardware and software design – ideal
platform for industrial GSM applications.
The memory space available for Java programs is around 1.7 MB
in the flash file system and around 400k RAM. Application code
and data share the space in the flash file system and in RAM.
SIM Application Toolkit SAT Release 99
TCP/IP stack Access by AT commands
IP addresses IP version 6
Remote SIM Access AC75 supports Remote SIM Access. RSA enables AC75 to use a
remote SIM card via its serial interface and an external
application, in addition to the SIM card locally attached to the
dedicated lines of the application interface. The connection
between the external application and the remote SIM card can be
a Bluetooth wireless link or a serial link.
The necessary protocols and procedures are implemented
according to the “SIM Access Profile Interoperability Specification
of the Bluetooth Special Interest Group”.
Firmware update Generic update from host application over ASC0, ASC1 or USB.
Over-the-air (OTA) firmware update is possible via SPI interface.

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Feature Implementation
Interfaces
2 serial interfaces ASC0:
•8-wire modem interface with status and control lines,
unbalanced, asynchronous
•Fixed bit rates: 300 bps to 460,800 bps
•Autobauding: 1,200 bps to 460,800 bps
•RTS0/CTS0 and XON/XOFF flow control.
•Multiplex ability according to GSM 07.10 Multiplexer Protocol.
ASC1:
•4-wire, unbalanced asynchronous interface
•Fixed bit rates: 300 bps to 460,800 bps
•RTS1/CTS1 and software XON/XOFF flow control
USB Supports a USB 2.0 Full Speed (12Mbit/s) slave interface.
I2C I2C bus for 7-bit addressing and transmission rates up to 400kbps.
Programmable with AT^SSPI command.
Alternatively, all pins of the I²C interface are configurable as SPI.
SPI Serial Peripheral Interface for transmission rates up to 6.5 Mbps.
Programmable with AT^SSPI command.
If the SPI is active the I²C interface is not available.
Audio •2 analog interfaces (2 microphone inputs and 2 headphone
outputs with microphone power supply)
•1 digital interface (PCM)
SIM interface Supported SIM cards: 3V, 1.8V
Antenna •50Ohms. External antenna can be connected via antenna
connector.
•Antenna diagnostic
Module interface 80-pin board-to-board connector
Power on/off, Reset
Power on/off •Switch-on by hardware pin IGT
•Switch-off by AT command (AT^SMSO)
•Automatic switch-off in case of critical temperature and
voltage conditions.
Reset •Orderly shutdown and reset by AT command
•Emergency reset by hardware pin EMERG_RST and IGT.
Special features
Charging Supports management of rechargeable Lithium Ion and Lithium
Polymer batteries
Real time clock Timer functions via AT commands
GPIO 10 I/O pins of the application interface programmable as GPIO.
Programming is done via AT commands.
Alternatively, GPIO pin10 is configurable as pulse counter.

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Feature Implementation
Pulse counter Pulse counter for measuring pulse rates from 0 to 1000 pulses
per second.
If the pulse counter is active the GPIO10 pin is not available.
DAC output Digital-to-Analog Converter which can provide a PWM signal.
Phonebook SIM and phone
Evaluation kit
DSB75 DSB75 Evaluation Board designed to test and type approve
Siemens cellular engines and provide a sample configuration for
application engineering.
2.2 AC75 System Overview
User Application
AC75
Application Interface
Charger
Charging
circuit
UART
Antenna
Interface
SPI
USB
DAC
USB
Host
ASC0
(modem) ASC1
SIM Digital
Audio Charge Power Supply
I2C
Slave
9 x
GPIO Analog
Audio
1x
GPIO
Pulse
Counter
Antenna
Diagnostic
I2C
Headphones
or Headsets
SIM
card
SPI
Slave
Audio
Codec
Figure 1: AC75 system overview

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2.3 Circuit Concept
Figure 1 shows a block diagram of the AC75 module and illustrates the major functional
components:
Baseband block:
•Digital baseband processor with DSP
•Analog processor with power supply unit (PSU)
•Flash / SRAM (stacked)
•Application interface (board-to-board connector)
•Antenna diagnostic
RF section:
•RF transceiver
•RF power amplifier
•RF front end
•Antenna connector
Digital Baseband
Processer with DSP
BATT+
GND
IGT
EMERG_RST
ASC(0)
5SIM Interface
CCIN
CCRST
CCIO
CCCLK
CCVCC
D(0:15)
A(0:24)
RD; WR; CS; WAIT
RF Control Bus
Interface
RF - Baseband
NTC
BATT_TEMP
VDDLP
SYNC
Transceiver
RF Power
Amplifier
SRAM
Flash
6
5
8
8
AC75
I / Q
4
Audio analog
DAC_OUT
10
USB
GPIO
3
10
I2C/SPI
SPI
2
2
VEXT
ISENSE
VSENSE
VCHARGE
CHARGEGATE
3
RESET
BATTYPE
TEMP2
REFCHG
ASC(1)
4
26MHz
Front End
DAI
7
PWR_IND
Measuring
Network
32.768kHz
26MHz
RTC
Application Interface (80 pin)
RF-Part
Analog
Controller
with PSU
Reset
Antenna
Diagnostic
ADC
Figure 2: AC75 block diagram