Globalsat MR-332 [3/8] Product pin description
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Globalsat MR-332 [3/8] Product pin description

Globalsat MR-332 [3/8] Product pin description
MR-332(SMA)
High Performance GPS Engine Board
- 3 -
Product Pin Description
PIN Number(s)
Name Type
Description Note
1,8,9,12 GND P Ground
2 VBAT P
This is the power input for the SRAM, RTC
and charging back up battery. To achieve the
faster start-up offered by a hot or warm start,
a backup power must be connected. When
VBAT released, the full battery can keep the
SRAM and RTC few hours. The VBAT
voltage should be between 3.3V and 3.6V.
When VCC is connected to the Power, VBAT
can be floating.
3 VCC P
This is the main power supply to the engine
board. (3.8Vdc to 5.5Vdc)
4 RESET I Push Button Reset Input (Active Low)
5,10 RESERVED MR-332 reserved pin, just NC.
6 TXD O
This is the main transmits channel for
outputting navigation and measurement data
to user’s navigation software or user written
software. Baud rate based on firmware
setting.
7 RXD I
This is the main receive channel for receiving
software commands to the engine board from
MTK software or from user written software.
Baud rate based on firmware setting.
11 TIMEPULSE O
This pin provides one pulse-per-second
output from the board, which is synchronized
to GPS time. If do not use it, Just NC.

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