EM-318-01
Specifications are subject to be changed without notice.
Page 5 of 16
Version 1.2.2
Pin Assignment
Pin # Name
Description
1
VCC_IN
DC Supply Voltage input
2
GND Analog
Ground
3
1PPS
One Pulse per second output synchronized to GPS time. Not available in
trickle mode.
4
BOOTSEL
Boot mode – set high to program flash
5
TXA
Serial output for channel
6
RXA
Serial input for channel
7
GPIO1
GPS Fix status output
8
VBAT
Backup voltage supply
This is the battery backup input that powers the SRAM and
RTC when main power is removed. Typical current draw is 15uA. Without an external
backup power supply, the GPS module/engine board will execute a cold star upon
each power-up. To achieve the faster start-ups a backup must be connected to this
pin (battery or Gold /Super capacitor). The voltage should be between 2.0v and 5.0v
.
(
NOTE
:
The VBAT pin must be kept “
HIGH
” for in order for the GPS board/module to
function if no backup power is going to be used. From the VCC, connect a 470 Ohm ¼
Watt resistor in series with a 3.2v Zener diode to Ground. Connect the VBAT pin to the
Zener’s cathode to pull the input “
HIGH
”.)
9
NRESET
Reset Input (Active Low)
10
NC Not
connect
