User's Manual

Confidential Preliminary – Subject to Change
 2010 China Mark, Ltd. T/A Montage Asia Page 17 of 19
Main Signals
Pin
Number
Name
Description
Properties
1
GPIO1
Configurable as general input
or output
2.8V logic level, 15V tolerance,
equivalent circuit in NOTE
2
GPIO2
Configurable as general input
or output
2.8V logic level, 15V tolerance,
equivalent circuit in NOTE
3
RLY
Relay drive, connect relay coil
between pin 6 and this pin
500mA, 15V tolerance open drain
MOSFEET, TVS overvoltage protected
4
GPIO3
Configurable as general input
or output
2.8V logic level, 15V tolerance,
equivalent circuit in NOTE
5
TX1
General UART TX output,
also serves as debug serial out
2.8V logic level, 15V tolerance,
equivalent circuit in NOTE
6
RX1
General UART RX input, also
serves as debug serial in
2.8V logic level, 15V tolerance,
equivalent circuit in NOTE
7
VIN
Power input, connect to
positive side of battery power
3A PTC inline self resetting fuse, also
clamped to GND through 15V hold
TVS diode
8
GND
System ground, connect to
negative of battery power
Power and signal ground point