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3. Pin Assignment of Connector
3.1. Serial Interface
Communication to the ZX4125 is provided via a serial interface. A 10-pin
1.27mm whole connector is used. The pin out is shown in Table 4-1.
Pin 6 (Reset) is the active-low reset input. The ZX4125 always requires a reset at
power-up, or it will not start properly. An optional onboard reset circuit can be
provided. A reset forces the ZX4125 processor to reboot, but will not influence other
parameters such as hot or cold start. Pin 1 (GPIO [4]) and pin 10 (GPIO [0]) are
spare pins that can be used e.g. to control power modes, to indicate ZX4125 status, or
to force a cold start. They can be left unconnected if desired.
I/O voltage level is set to 2.7V.
Table 3-1 Pin list of the Serial Interface
Pin Name Type Description
1 GPIO [4] I/O GPS Status
2 NC (MODE) NU Reserved, keep float
3 NMEA TX I/O NMEA Serial Data Output
4 NMEA RX I/O NMEA Serial Data Input
5 NC (WAKEUP)
NU Reserved, keep float
6 Reset I Low Active, keep float if not use *1
7 VBAT I Backup Battery Input (1.2~2V)
8 GND PWR Ground
9 VDD PWR +3.0~3.6V DC Power Input
10 GPIO [0] I/O SW dependent functions
*1: Max voltage is DC 2V.
8


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