User's Manual

XT55/56 Hardware Interface Description
Confidential / Released
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XT55/56_hd_v02.06a Page 6 of 125 17.12.2004
Figures
Figure 1: Block diagram of serial interface concept ...............................................................25
Figure 2: Power supply limits during transmit burst................................................................ 29
Figure 3: Power-on by ignition signal ..................................................................................... 31
Figure 4: Timing of power-on process if GSM_VDDLP is not used .......................................32
Figure 5: Timing of power-on process if GSM_VDDLP is fed from external source ..............32
Figure 6: Deactivating GSM engine by GSM_EMERGOFF signal.........................................36
Figure 7: Schematic of approved charging transistor, trickle charging and ESD protection .. 41
Figure 8: Battery pack circuit diagram....................................................................................43
Figure 9: Charging process .................................................................................................... 45
Figure 10: Timing of CTS signal (example for a 2.12 s paging cycle).................................... 50
Figure 11: Beginning of power saving if CFUN=5 or 7........................................................... 50
Figure 12: RTC supply from capacitor.................................................................................... 54
Figure 13: RTC supply from rechargeable battery .................................................................54
Figure 14: RTC supply from non-chargeable battery .............................................................54
Figure 15: Audio block diagram.............................................................................................. 57
Figure 16: Schematic of microphone inputs ........................................................................... 58
Figure 17: DAI timing on transmit path................................................................................... 60
Figure 18: DAI timing on receive path .................................................................................... 60
Figure 19: SIM card holder of DSB45 Support Box................................................................63
Figure 20: Pin numbers of Molex SIM card holder on DSB45 Support Box........................... 63
Figure 21: GSM_SYNC signal during transmit burst.............................................................. 65
Figure 22: LED Circuit (Example)...........................................................................................67
Figure 23: Incoming voice call................................................................................................68
Figure 24: Incoming data call ................................................................................................. 68
Figure 25: URC transmission ................................................................................................. 68
Figure 26: Theory of operation ............................................................................................... 70
Figure 27: Example for current in Trickle Power mode ..........................................................73
Figure 28: Comparing typical current in Trickle Power and Push-to-Fix mode ......................74
Figure 29: Example of LED circuit.......................................................................................... 77
Figure 30: Receiver architecture of the GPS receiver............................................................ 77
Figure 31: U.FL-R-SMT connector ......................................................................................... 80
Figure 32: Antenna pad and GND plane ................................................................................ 80
Figure 33: Never use antenna connector and antenna pad at the same time ....................... 81
Figure 34: Restricted area around antenna pad..................................................................... 81
Figure 35: GPS antenna connector (U.FL-R-SMT connector) ...............................................82
Figure 36: Mechanical dimensions of U.FL-R-SMT connector...............................................83
Figure 37: U.FL-R-SMT connector with U.FL-LP-040 plug ....................................................84
Figure 38: U.FL-R-SMT connector with U.FL-LP-066 plug ....................................................84
Figure 39: Specifications of U.FL-LP-(V)-040(01) plug .......................................................... 85
Figure 40: Pin assignment (top view on XT55/56) ................................................................. 89
Figure 41: Typical current consumption vs. return loss in EGSM 900 network......................97
Figure 42: Typical current consumption vs. return loss in GSM 1800 network ......................98
Figure 43: Typical current consumption vs. return loss in GSM 1900 network ......................98
Figure 44: Peak current consumption during transmit burst in EGSM 900 network...............99
Figure 45: Peak current consumption during transmit burst in GSM 1800 network ...............99
Figure 46: Peak current consumption during transmit burst in GSM 1900 network .............100
Figure 47: Typical current consumption vs. return loss........................................................ 101
Figure 48: AT audio programming model............................................................................. 103
Figure 49: XT55/56 – top view ............................................................................................. 110
Figure 50: XT55/56 bottom view .......................................................................................... 110
Figure 51: Mechanical dimensions of XT55/56 .................................................................... 111
Figure 52: Mounting holes on XT55/56 ................................................................................ 112