TC35i Hardware Interface Description
Confidential / Released
TC35i_HD_v01.03 Page 2 of 82 14.04.2003
Document Name:
TC35i Hardware Interface Description
Version: 01.03
Date: April 14, 2003
DocId: TC35i_HD_v01.03
Status: Confidential / Released
General notes
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.
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model or design patent are reserved.
Copyright © Siemens AG 2003
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Contents
0 Document history....................................................................................................... 7
1 Introduction ................................................................................................................ 8
1.1 Related documents ............................................................................................. 8
1.2 Terms and abbreviations..................................................................................... 9
1.3 Standards ..........................................................................................................12
1.4 Safety Precautions .............................................................................................14
2 Product overview ......................................................................................................16
2.1 TC35i key features at a glance ..........................................................................17
2.2 Circuit concept ...................................................................................................19
3 Application Interface.................................................................................................20
3.1 Operating modes ...............................................................................................21
3.2 Power supply .....................................................................................................22
3.2.1 Power supply pins on the ZIF connector...............................................23
3.2.2 Minimizing power losses.......................................................................24
3.2.3 Monitoring power supply.......................................................................24
3.3 Power up / down scenarios ................................................................................25
3.3.1 Turn on the GSM engine ......................................................................25
3.3.1.1 Turn on GSM engine using the ignition line IGT (Power on).................25
3.3.1.2 Timing of the ignition process...............................................................26
3.3.1.3 Turn on GSM engine using the POWER lines ......................................27
3.3.1.4 Turn on GSM engine using the RTC (Alarm mode) ..............................27
3.3.2 Turn off GSM engine ............................................................................28
3.3.2.1 Turn off GSM engine using the AT^SMSO command...........................28
3.3.2.2 Timing and maximum number of turn-on / turn-off cycles.....................28
3.3.2.3 Emergency shutdown using /EMERGOFF pin......................................29
3.3.3 Automatic shutdown .............................................................................30
3.3.3.1 Temperature dependent shutdown.......................................................30
3.3.3.2 Temperature control during emergency call .........................................31
3.3.3.3 Monitoring the board temperature of TC35i ..........................................31
3.3.3.4 Shutdown in the event of undervoltage.................................................32
3.3.3.5 Shutdown in the event of overvoltage...................................................32
3.4 Charging control.................................................................................................33
3.4.1 Battery pack .........................................................................................33
3.4.2 Recommended battery pack.................................................................34
3.4.3 Implemented charging technique..........................................................34
3.4.4 Operating modes during charging ........................................................36
3.4.5 Charger requirements ..........................................................................37
3.5 Power saving .....................................................................................................38
3.5.1 No power saving (AT+CFUN=1)...........................................................38
3.5.2 NON-CYCLIC SLEEP mode (AT+CFUN=0) .........................................38
3.5.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7 and 8) ................................38
3.5.4 Timing of the /CTS signal in CYCLIC SLEEP modes ...........................39
3.5.5 Wake up TC35i from SLEEP mode ......................................................41
3.5.6 Summary of state transitions (except SLEEP mode) ............................42
3.6 RTC backup.......................................................................................................43
3.7 Serial interface...................................................................................................45
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3.8 Audio interface .................................................................................................. 47
3.8.1 Speech processing .............................................................................. 48
3.9 SIM interface..................................................................................................... 49
3.9.1 Requirements for using the CCIN pin .................................................. 50
3.9.2 Design considerations for SIM card holder .......................................... 51
3.10 Control signals .................................................................................................. 52
3.10.1 Inputs .................................................................................................. 52
3.10.2 Outputs................................................................................................ 53
3.10.2.1 Synchronization signal......................................................................... 53
3.10.2.2 Using the SYNC pin to control a status LED........................................ 54
3.10.2.3 Behaviour of the /RING0 line ............................................................... 55
4 RF interface .............................................................................................................. 56
4.1 Antenna connector ............................................................................................ 57
5 Electrical, reliability and radio characteristics....................................................... 60
5.1 Absolute maximum ratings................................................................................ 60
5.2 Operating conditions ......................................................................................... 60
5.2.1 Temperature conditions....................................................................... 60
5.3 Electrical specifications of the application interface........................................... 61
5.4 Power supply ratings......................................................................................... 65
5.4.1 Burst peak current during transmit burst.............................................. 66
5.5 Electrical characteristics of the voiceband part.................................................. 67
5.5.1 Setting audio parameters by AT command.......................................... 67
5.5.2 Audio programming model .................................................................. 68
5.5.3 Characteristics of audio modes ........................................................... 69
5.5.4 Voiceband receive path ....................................................................... 70
5.5.5 Voiceband transmit path...................................................................... 71
5.6 Air interface....................................................................................................... 72
5.7 Electrostatic discharge ...................................................................................... 73
5.8 Reliability characteristics ................................................................................... 74
6 Mechanics................................................................................................................. 75
6.1 Mechanical dimensions of TC35i....................................................................... 75
6.2 Mounting TC35i onto the application platform ................................................... 77
6.3 ZIF connector (application interface) ................................................................. 78
6.3.1 FFC ..................................................................................................... 78
6.3.2 Mechanical dimensions of Hirose FH12-40S 0.5 SH connector........... 79
7 Reference Approval.................................................................................................. 80
7.1 Reference Equipment ....................................................................................... 80
8 APPENDIX: List of parts and recommended accessories..................................... 81
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Figures
Figure 1: Block diagram of TC35i.........................................................................................19
Figure 2: Block diagram of a cellular application ..................................................................20
Figure 3: Power supply limits during transmit burst ..............................................................24
Figure 4: Power on by ignition signal....................................................................................25
Figure 5: Timing of power-on process if VDDLP is not used ................................................26
Figure 6: Timing of power-on process if VDDLP is fed from external source........................26
Figure 7: Deactivating GSM engine by Power Down signal..................................................29
Figure 8: Battery pack circuit diagram ..................................................................................33
Figure 9: Internal charging circuit .........................................................................................35
Figure 10: Charging process ................................................................................................35
Figure 11: Timing of /CTS signal (example for a 2.12 s paging cycle)..................................39
Figure 12: Beginning of power saving if CFUN=5.................................................................40
Figure 13: RTC supply from capacitor..................................................................................43
Figure 14: RTC supply from rechargeable battery................................................................43
Figure 15: RTC supply from non-chargeable battery (e.g. a coin cell)..................................43
Figure 16: Serial interface ....................................................................................................45
Figure 17: Audio block diagram............................................................................................47
Figure 18: SIM card holder of DSB35 Support Box ..............................................................51
Figure 19: Pin numbers of Molex SIM card holder on DSB35 Support Box ..........................51
Figure 20: TC35i output control signals................................................................................53
Figure 21: LED Circuit (Example).........................................................................................54
Figure 22: Incoming voice call ..............................................................................................55
Figure 23: Incoming data call ...............................................................................................55
Figure 24: URC transmission ...............................................................................................55
Figure 25: Antenna connector circuit on TC35i.....................................................................56
Figure 26: Mechanical dimensions of MuRata GSC connector (in mm)................................58
Figure 27: Maximum mechanical stress to the connector.....................................................59
Figure 28: How to use MuRata tool ......................................................................................59
Figure 29: Pin assignment (top view on TC35i) ....................................................................61
Figure 30: Maximum burst peak current during transmit burst in A.......................................66
Figure 31: AT audio programming model .............................................................................68
Figure 32: Structure of audio inputs .....................................................................................71
Figure 33: TC35i – top view..................................................................................................75
Figure 34: Mechanical dimensions of TC35i.........................................................................76
Figure 35: Mounting TC35i...................................................................................................77
Figure 36: Hirose FH12 connector .......................................................................................78
Figure 37: Description of Hirose FH12 connector.................................................................79
Figure 38: Reference equipment for approval ......................................................................80
