Power Supply And Mcu Power On/Off - Cartft FLEETPC-ARM-300 Series Reference Manual

3.1

Power Supply and MCU Power ON/OFF

The FLEETPC-ARM-300 power input should be applied to the 3-pin DC-IN
connector (CN3). Refer to Appendix C for DC-IN mating connector specification.
Refer to Appendix D for DC-IN connector specification.
The input voltage can be in the range of DC 9V-36V. An Over-Voltage-Protection circuit
(optional function) is implemented to protect FLEETPC-ARM-300 from over voltage damage.
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The pin 3 of DC-IN connector is a photo-coupled input (5KV isolation) dedicated for vehicle
power ignition signal. The input is connected to FLEETPC-ARM-300 power on/off MCU. If
pin 3 is not connected to the ignition switch, it has to be connected to HIGH (+12V) to
ensure a simulated ignition signal is sent to FLEETPC-ARM-300.
Refer to Appendix A for brief specification of the photo-coupler IC.
The input power connection is suggested in the following diagrams:
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LAN1
USB
Page
FLEETPC-ARM-300 Series
(Ignition) CN3 Pin 3
LAN2 LAN3
11
CN3 Pin 2 (GND)
CN3 Pin 1 (PWR)
DC‐IN
LAN4