Cartft FLEETPC-ARM-300 Reference Manual page 12

Power Connection 1 – The FLEETPC-ARM-300 CN3 pin1/2 are connected to car battery
directly and
CN3 pin 3 is connected to ignition button.
When FLEETPC-ARM-300 MCU detects car ignition on, it will turn on FLEETPC-ARM-300
system power. When car ignition signal is off, MCU will inform iMX6 to execute a Linux
shutdown command (shutdown –h +xx, where xx is minute of delay, and xx can be
configured in FLEETPC-ARM-300 device manager) and turn off system power. See "MCU-
controlled power on/off"
descriptions in this section.
Power Connection 1
+
Car Battery
Power Connection 2 – The FLEETPC-ARM-300 CN3 pin1/2/3 are connected to car
battery directly. This connection will make FLEETPC-ARM-300 always ON. Since CN3
pin3 is connected to high, MCU will always detect an ignition signal. Even software
executes "shutdown –h now" or "echo 0
> /sys/class/leds/pwr_gpio/brightness" commands (see "MCU-controlled power on/off"
descriptions in this section) to turn off system power, MCU will turn on power again in 5
seconds. Such connection is not suggested unless software developer knows when to turn
off FLEETPC-ARM-300 power.
Power Connection 2
+ ‐
Car Battery
‐
Ignition
button
FLEETPC-ARM-300 Series
3 2 1
CN3
FLEETPC
‐ARM‐
Connection 300
Point
3 2 1
CN3
FLEETPC
12
Page
In‐car
Power bus
In‐car
Power bus