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 />
3.3.1.1 Turn on the GSM part of XT55/56 using the ignition line GSM_IGT<br />
(Power on)<br />
To switch on the XT55/56 GSM part the GSM_IGT (Ignition) signal needs to be driven to<br />
ground level for at least 100ms and not earlier than 10ms after the last falling edge of<br />
GSM_VDD. This can be accomplished using an open drain/collector driver in order to avoid<br />
current flowing into this pin.<br />
GSM_BATT+<br />
min. 10ms<br />
HiZ<br />
min.<br />
100ms<br />
HiZ<br />
GSM_IGT<br />
GSM_VDD<br />
ca. 60ms<br />
GSM_TXD0<br />
GSM_TXD1<br />
GSM_DSR0<br />
GSM_EMERGOFF<br />
Software<br />
controlled<br />
Serial interfaces<br />
ASC0 and ASC1<br />
Undefined Inactive Active<br />
ca. 300ms<br />
ca. 900ms<br />
For details please see Chapter 3.3.1.2<br />
Figure 3: Power-on by ignition signal<br />
If configured to a fix baud rate, the GSM part of the XT55/56 will send the result code<br />
^SYSSTART to indicate that it is ready to operate. This result code does not appear when<br />
autobauding is active. See Chapter AT+IPR in [1].<br />
In a battery operated XT55/56 application, the duration of the GSM_IGT signal must be 1s<br />
minimum when the charger is connected and you may want to go from Charge only mode to<br />
Normal mode.<br />
XT55/56_hd_v02.06a Page 31 of 125 17.12.2004
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