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 />
4.4 Power supply of the XT55/56 GPS part<br />
The power supply for the GPS part of the XT55/56 module has to be a single voltage source<br />
of V CC =3.3V ± 5%. It must be able to provide sufficient current of >100mA.<br />
GPS_VCC:<br />
Two GPS_VCC pins of the board-to-board connector are dedicated to connect the power<br />
supply voltage, five GND pins shared with the GSM part of the XT55/56 module are<br />
recommended for grounding; see Figure 40 for details.<br />
If no GPS_VCC is connected to XT55/56, the RTC and SRAM of the GPS part of XT55/56<br />
can be fed by GSM_BATT+ of XT55/56.<br />
GPS_VANT:<br />
This pin is used for an external DC power supply of an active antenna.<br />
The GPS_VANT input voltage should be chosen according to the connected antenna.<br />
In order to use a 5V active GPS antenna, the GPS_VANT has to be connected to 5V<br />
external power supply.<br />
When using a 3V antenna it is possible to connect the GPS_VCC_RF output (which provides<br />
3.0V) to GPS_VANT.<br />
GPS_VCC_RF:<br />
This pin is an output which provides +3.0V DC and can be connected to the GPS_VANT in<br />
order to supply the GPS antenna.<br />
In Trickle Power mode and Push-to-Fix mode, GPS_VCC_RF is switched off during the<br />
sleep phase.<br />
GSM_BATT+:<br />
If no GPS_VCC is connected to XT55/56, the RTC and SRAM of the GPS part of XT55/56 is<br />
fed by GSM_BATT+ of XT55/56.<br />
4.5 General purpose input/output<br />
Several I/O’s (GPS_GPIO0, GPS_GPIO1, GPS_GPIO3, GPS_GPIO5, GPS_GPIO6,<br />
GPS_GPIO7, GPS_GPIO10, GPS_GPIO13, GPS_GPIO14, GPS_GPIO15) of the CPU are<br />
connected to the hardware interface connector of the XT55/56 GPS receiver. They are<br />
reserved for customer specific applications.<br />
NOTE: Not all of these pins are supported by the current GPS firmware.<br />
XT55/56_hd_v02.06a Page 75 of 125 17.12.2004