Hardware Interface Description - KORE Telematics

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XT55/56 Hardware Interface Description Confidential / Released s 2) GSM_RTS1 can be used to temporarily wake up XT55/56 for the time specified with the AT^SCFG command (default = 2s). Recommendation: In NON-CYCLIC SLEEP mode, you can set an RTC alarm to wake up XT55/56 and return to full functionality. This is a useful approach because, in this mode, the AT interface is not accessible. XT55/56_hd_v02.06a Page 52 of 125 17.12.2004
XT55/56 Hardware Interface Description Confidential / Released s 3.7 Summary of state transitions (except SLEEP mode) Table 12: State transitions of XT55/56 (except SLEEP mode) The table shows how to proceed from one GSM mode to another (grey column = present mode, white columns = intended modes) Further mode Present mode POWER DOWN mode without charger POWER DOWN mode with charger (high level at GSM_POWER pin of XT55/56) Normal mode **) Charge-only mode *) Charging in normal AT^SMSO *) **) mode Alarm mode POWER DOWN Normal mode **) Charge-only mode *) Charging in normal mode *)**) Alarm mode --- GSM_IGT >100 ms at low level --- GSM_IGT >1 s at low level, if battery is fully charged AT^SMSO or exceptionally GSM_EMERGOFF pin > 3.2s at low level Disconnect charger (XT55/56 GSM_POWER pin at low level) or AT^SMSO or exceptionally GSM_EMERGOFF pin >3.2s at low level “Charge-only mode”, again AT^SMSO or exceptionally GSM_EMERGOFF pin >3.2s at low level AT^SMSO or exceptionally GSM_EMERGOFF pin >3.2s at low level Connect charger to input of ext. charging circuit and GSM_POWER pin (high level at GSM_POWER) 100ms < GSM_IGT < 500ms at low level --- No automatic transition, but via “POWER DOWN” No automatic transition, but via “Charge in Normal mode” Disconnect charger from input of ext. charging circuit and module’s GSM_POWER pin GSM_IGT >100ms at low level No direct transition, but via “Charge-only mode” or “Normal mode” GSM_IGT >1 s at low level Connect charger to GSM_POWER pin at XT55/56 (high level at GSM_POWER) Wake-up from POWER DOWN mode (if activated with AT+CALA) Wake-up from POWER DOWN mode (if activated with AT+CALA) AT+CALA followed by AT^SMSO. XT55/56 enters Alarm mode when specified time is reached. --- GSM_IGT >1s at low level AT+CALA followed by AT^SMSO. XT55/56 enters Alarm mode when specified time is reached and V GSM_BATT+ >3.2V AT^SMSO --- No direct transition AT^SMSO if charger is connected GSM_IGT >100ms at low level --- *) See Chapter 3.5.4 for details on the charging mode **) Normal mode covers TALK, DATA, GPRS, IDLE and SLEEP modes XT55/56_hd_v02.06a Page 53 of 125 17.12.2004
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