GLOBALSAT ET-314 GPS Engine Board - Manual (Page 4)

ET-314AC
High Performance GPS Engine Board
2010/4/1
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PIN Number(s) Name Type Description Note
1 VCC P Main power supply to the engine board.
2,10,30 GND P Ground.
3 BOOTSEL I Set this pin to high for programming flash. 2
4 RxD0 I
This is the main receive channel for receiving
software commands to the engine board from
SiRFdemo software or from user written
software.
1
5 TxD0 O
This is the main transmits channel for
outputting navigation and measurement data
to user’s navigation software or user written
software. Output TTL level, 0V ~ 2.85V.
6 TxD1 O Serial output (default null)
7 RxD1 I Serial input (default null) 1
8 GPIO14 I/O General purpose I/O 1,3
9,25,26 NC ET-314AC reserves PIN
11,12,13,14,
15,16,18
GND_A P GPS RF Ground.
17. RF IN RF GPS antenna input
19 V_ANT I Antenna Bias voltage
20 VCC_RF O Supply Antenna Bias voltage (V=VCC)
21 V_BAT P Backup battery supply voltage
22 RESET I System reset (active low)
23 VDD28OUT O Output voltage 2.85V
24 GPIO1 I/O General purpose I/O 2,3
27 GPIO13 I/O General purpose I/O 1,3
28 GPIO15 I/O General purpose I/O 1,3
29 1PPS O One pulse per second output. 2,3
<Note>
1. Internal pull-up resistor (100KΩ nominal).
2. Internal pull-down resistor (100KΩ nominal).
3. Default input at reset.