Hardware Interface Description - KORE Telematics

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XT55/56 Hardware Interface Description Confidential / Released s 3.12 Control signals 3.12.1 Inputs Table 17: Input control signals of the GSM part of the XT55/56 module Signal Pin Pin status Function Remarks Ignition GSM_IGT Falling edge Power up XT55/56 Active low ≥ 100ms (Open Left open or HiZ No operation drain/collector driver to GND required in cellular device application). Note: If a charger and a battery is connected to the customer application the GSM_IGT signal must be 1s minimum. Emergency shutdown GSM_EMERG- OFF Low Power down XT55/56 Left open or HiZ No operation Active low ≥ 3.2s (Open drain/collector driver required in cellular device application). At the GSM_EMERGOFF signal the watchdog signal of the GSM engine can be traced (see description in Table 27). (HiZ = high impedance) XT55/56_hd_v02.06a Page 64 of 125 17.12.2004
XT55/56 Hardware Interface Description Confidential / Released s 3.12.2 Outputs 3.12.2.1 Synchronization signal The synchronization signal serves to indicate growing power consumption during the transmit burst. The signal is generated by the GSM_SYNC pin. Please note that this pin can adopt two different operating modes which you can select by using the AT^SSYNC command (mode 0 and 1). For details refer to the following chapter and to [1]. To generate the synchronization signal the pin needs to be configured to mode 0 (= default). This setting is recommended if you want your application to use the synchronization signal for better power supply control. Your platform design must be such that the incoming signal accommodates sufficient power supply to the XT55/56 module if required. This can be achieved by lowering the current drawn from other components installed in your application. The timing of the synchronization signal is shown below. High level of the GSM_SYNC pin indicates increased power consumption during transmission. 1 Tx 577 µs every 4.616 ms 2 Tx 1154 µs every 4.616 ms Transmit burst GSM_SYNC signal *) 300 µs Figure 21: GSM_SYNC signal during transmit burst *) The duration of the GSM_SYNC signal is always equal, no matter whether the traffic or the access burst are active. XT55/56_hd_v02.06a Page 65 of 125 17.12.2004
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