USGlobalsat EM-5318 - Manual (Page 4)

EM-5318
High Performance GPS Module
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setting, Output TTL level referred VCC
6 RXD I
This is the main receive channel for receiving
software commands to the engine board from
SiRFdemo software or from user written
software. Baud rate based on flash memory
setting.
7 GPIO I/O
This GPIO function based on flash memory
setting, and voltage level is 1.8V.
8 VBAT P
This is the battery backup power input for the
SRAM and RTC when main power is off.
Without the external backup battery,
EM-5318 will always execute a cold star after
turning on. To achieve the faster start-up
offered by a hot or warm start, a battery
backup must be connected. The battery
voltage should be between 2.0V and 3.5V.
9 RESET I
This pin is input low active. This Module has
internal Power on Reset circuit.
10 NC O EM-5318 reserved pin, Just NC.
MMCX
connector
I
MMCX Connect to external active antenna
for receiving GPS signal.