User Manual
Table Of Contents
- Document History
- Introduction
- Product Concept
- GSM Application Interface
- GSM/GPRS Operating Modes
- Power Supply
- Power Up / Down Scenarios
- Automatic GPRS Multislot Class Change
- Charging Control of the GSM Part
- Power Saving
- Summary of State Transitions (Except SLEEP Mode)
- RTC Backup for GSM Part of XT55/56
- Serial Interfaces of the XT55/56 GSM Part
- Audio Interfaces
- SIM Interface
- Control Signals
- GPS Application Interface
- GSM and GPS Antenna Interfaces
- Electrical, Reliability and Radio Characteristics
- Mechanics
- Reference Approval
- Example Applications
- List of Parts and Accessories
XT55/56 Hardware Interface Description
Confidential / Preliminary
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XT55/56_hd_v02.96 Page 5 of 125 18.08.2005
6.5.5 Voiceband Transmit Path.....................................................................107
6.6 Air Interface of the XT55/56 GSM Part ..............................................................108
6.7 Electrostatic Discharge ......................................................................................109
6.8 Reliability Characteristics...................................................................................110
7 Mechanics..................................................................................................................111
7.1 Mechanical Dimensions of XT55/56 ..................................................................111
7.2 Mounting XT55/56 onto the Application Platform ..............................................113
7.3 Board-to-Board Connector.................................................................................115
8 Reference Approval ..................................................................................................117
8.1 Reference Equipment for Type Approval...........................................................117
8.2 Compliance with FCC Rules and Regulations (XT55 only) ...............................118
8.3 Compliance with FCC Rules and Regulations (XT56 only) ...............................119
9 Example Applications...............................................................................................120
10 List of Parts and Accessories..................................................................................124
Figures
Figure 1: Product label placed on XT55/56 module ............................................................... 11
Figure 2: Block diagram of serial interface concept ...............................................................26
Figure 3: Power supply limits during transmit burst................................................................ 30
Figure 4: Power-on by ignition signal ..................................................................................... 32
Figure 5: Timing of power-on process if GSM_VDDLP is not used .......................................33
Figure 6: Timing of power-on process if GSM_VDDLP is fed from external source ..............34
Figure 7: Deactivating GSM engine by GSM_EMERGOFF signal......................................... 37
Figure 8: Schematic of approved charging transistor, trickle charging and ESD protection .. 42
Figure 9: Battery pack circuit diagram....................................................................................44
Figure 10: Charging process ..................................................................................................47
Figure 11: Timing of CTS signal (example for a 2.12 s paging cycle).................................... 52
Figure 12: Beginning of power saving if CFUN=5 or 7........................................................... 52
Figure 13: RTC supply from capacitor.................................................................................... 56
Figure 14: RTC supply from rechargeable battery .................................................................56
Figure 15: RTC supply from non-chargeable battery .............................................................56
Figure 16: Audio block diagram.............................................................................................. 59
Figure 17: Schematic of microphone inputs ........................................................................... 60
Figure 18: DAI timing on transmit path................................................................................... 62
Figure 19: DAI timing on receive path .................................................................................... 62
Figure 20: SIM card holder of DSB45 Support Box................................................................65
Figure 21: Pin numbers of Molex SIM card holder on DSB45 Support Box........................... 65
Figure 22: GSM_SYNC signal during transmit burst.............................................................. 67
Figure 23: LED Circuit (Example)...........................................................................................69
Figure 24: Incoming voice call................................................................................................70
Figure 25: URC transmission ................................................................................................. 70
Figure 26: Theory of operation ............................................................................................... 71
Figure 27: Example for current in Trickle Power mode ..........................................................74
Figure 28: Comparing typical current in Trickle Power and Push-to-Fix mode ......................75
Figure 29: Example of LED circuit.......................................................................................... 78
Figure 30: Receiver architecture of the GPS receiver............................................................ 78
Figure 31: U.FL-R-SMT connector ......................................................................................... 81
Figure 32: Antenna pad and GND plane ................................................................................ 81