USGlobalsat EB-5531 - Manual (Page 3)

EB-5531
High Performance GPS Engine Board
2010/8/2 - 3 -
PIN Number(s) Name Type Description Note
1 RXB I Serial input (default null) 1
2 TXB O Serial output (default null)
3 TIMEMARK O One pulse per second output.(1PPS) 2,3
4 TXA 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.
5 RXA I This is the main receive channel for receiving
software commands to the engine board from
SiRFdemo software or from user written
software. 1
6 NC NC
7,8,13,14,15 GPIOs I/O General purpose I/O 1,3
9 RF_PWR CTR RF Power ON/OFF.
10 ON_OFF I Edge triggered soft on/off request. It must be
low for normal application.
11 VBAT P Backup battery supply voltage
12 VCC P Main power supply to the engine board.
16 BOOTSEL I Set this pin to high for programming flash. 2
17 VCC_RF PWR Regulated RF power output.
19 RF IN RF GPS antenna input
18,20,21,22 GND P Ground.
<Note>
1. Internal pull-up resistor (100K
Ω nominal).
2. Internal pull-down resistor (100K Ω nominal).
3. Default input at reset.