USGlobalsat EB-5531 User 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.
1. Internal pull-up resistor (100K
Ω nominal).
2. Internal pull-down resistor (100K
Ω nominal).
3. Default input at reset.