2012/7/30
- 3 -
Product Pin Description
PIN Number(s)
Name
Type
Description
Note
1
RF IN
RF
GPS antenna input
2,3,4,6,8,9,10,12
14,15,17,19,21,
22,23,24,26,28,
29,33,35,36
GND
P
Ground.
5
VBAT
P
This is the battery backup power input for
the SRAM and RTC when main power is
removed.
7,32,34,16
NC
NC
11
VCC
P
This is the main power supply to the engine
board. (3.1Vdc to 3.5Vdc)
13
RESET
I
This input is low active.
18
GPIO
I/O
User can use this I/O pin for special
functions. (For example, control LED)
1
20
TIMEMARK
O
One pulse per second output.(1PPS)
25
ON_OFF
I
ON_OFF pin is used to command the
EB-5631RE to turn on or off
2
27
WAKE_UP
O
System power on, 1.8V output .
3
30
TXD
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.
31
RXD
I
This is the main receive channel for
receiving software commands to the engine
board from SiRFDemo software or from user
written software.
