Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
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XT55/56 <strong>Hardware</strong> <strong>Interface</strong> <strong>Description</strong><br />
Confidential / Released<br />
s<br />
3.12.2 Outputs<br />
3.12.2.1 Synchronization signal<br />
The synchronization signal serves to indicate growing power consumption during the transmit<br />
burst. The signal is generated by the GSM_SYNC pin. Please note that this pin can adopt<br />
two different operating modes which you can select by using the AT^SSYNC command<br />
(mode 0 and 1). For details refer to the following chapter and to [1].<br />
To generate the synchronization signal the pin needs to be configured to mode 0 (= default).<br />
This setting is recommended if you want your application to use the synchronization signal<br />
for better power supply control. Your platform design must be such that the incoming signal<br />
accommodates sufficient power supply to the XT55/56 module if required. This can be<br />
achieved by lowering the current drawn from other components installed in your application.<br />
The timing of the synchronization signal is shown below. High level of the GSM_SYNC pin<br />
indicates increased power consumption during transmission.<br />
1 Tx 577 µs every 4.616 ms<br />
2 Tx 1154 µs every 4.616 ms<br />
Transmit burst<br />
GSM_SYNC signal *)<br />
300 µs<br />
Figure 21: GSM_SYNC signal during transmit burst<br />
*)<br />
The duration of the GSM_SYNC signal is always equal, no matter whether the traffic or<br />
the access burst are active.<br />
XT55/56_hd_v02.06a Page 65 of 125 17.12.2004
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