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 />
4.6 Serial interfaces of the XT55/56 GPS part<br />
The GPS part of the XT55/56 module offers two serial interfaces:<br />
SD1<br />
• 2-wire serial interface<br />
• Includes the SDI1 (receive) and SDO1 (transmit) lines<br />
• Supported baud rate: 9600…115200 bps. See also [1] for details on the used GPS<br />
protocol.<br />
SD2<br />
• 2-wire serial interface<br />
• Includes the SDI2 (receive) and SDO2 (transmit) lines. It is intended for communication<br />
with the GSM/ GPRS part of the XT55/56 module. See Figure 1 for details.<br />
• Supported baud rate: 9600…115200 bps. See also [1] for details on the used GPS<br />
protocol.<br />
SD1 and SD2<br />
• Both interfaces are configured for 8 data bits, no parity and 1 stop bit<br />
• For more detailed characteristics see [1]<br />
4.7 GPS control signals<br />
GPS_M-RST:<br />
This pin provides an active-low reset input to the board. It causes the board<br />
to reset and start searching for satellites. Reset is an optional input and, if<br />
not utilized, it may be left open.<br />
GPS_BOOTSEL:<br />
Set this pin to high for reprogramming the flash of the XT55/56 GPS part (for<br />
instance updating to a new XT55/56 GPS firmware).<br />
GPS_RFPC0, GPS_RFPC1 (including pull-up resistors):<br />
These pins are input pins for Trickle-Power mode control. To use the Trickle-<br />
Power mode function connect the RFPC0 and RFPC1 as shown in Figure<br />
58. The pull-up resistors ensure the correct voltage level during start-up and<br />
reset procedure of the GPS base band processor.<br />
GPS_GPIO8, GPS_GPIO4:<br />
These pins are control outputs for the Trickle-Power mode. GPS_GPIO8<br />
must be connected to GPS_RFPC0 and GPS_GPIO4 to GPS_RFPC1.<br />
GPS_GPIO8, GPS_GPIO4 can also be used to control a LED. A possible<br />
circuit is shown in Figure 29. If the LED lights permanently the GPS receiver<br />
is searching for satellites. If the GPS receiver is in Trickle-Power mode, the<br />
LED flashes in rhythm, i.e. the GPS receiver receives valid position data.<br />
Timing differs between GPS_GPIO4 and GPS_GPIO8.<br />
Note: If Trickle power is switched off the LED lights permanently.<br />
XT55/56_hd_v02.06a Page 76 of 125 17.12.2004
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