Dip Switch (On=Down) - mini-box M4-ATX Installation Manual

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DIP Switch (ON=down)

1 2 3
P
OFF OFF OFF
P0
ON OFF OFF
P1
OFF ON OFF
P2
ON ON OFF
P3
OFF OFF ON
P4
ON OFF ON
P5
OFF ON ON
P6
ON ON ON
P7
motherboard when ignition is ON for more than 2 seconds, sends OFF pulse to
motherboard 5 seconds after ignition is turned off. Waits another 1 minute and then
shuts down 5VSB to conserve battery. In this mode, the M4-ATX consumes less than
0.5mA. This is our recommended setting.
NOTE: To reset to the M4-ATX settings to the factory defaults (in case changes were
made via the USB uplink), simply power off the unit, connect a jumper to JP1 and then
power back up. The LED light will start to flash rapidly indicating that the factory defaults
were loaded. Don't forget to Remove jumper when done! Disconnect M4-ATX from
battery for at least 10 seconds. Next time when power is applied, M4-ATX will operate
from the factory defaults settings.
Power challenges in a Vehicle PC: One of most difficult tasks of operating a PC in a
vehicle is power consumption while the computer is OFF. Even when your computer is
OFF, it will still consume about 100mA on the 5V rail. When the computer is in the
suspend mode, it will consume even more power, because the RAM needs to be
powered at all times. No matter how big your battery is, you will eventually drain it if
proper actions are not taken.
The M4-ATX is addressing these issues by cutting off the 5VSB rail after a pre-defined
amount of time (see jumper chart, HARDOFF). During the HARDOFF if the battery level
drops below 11.2V for more than one minute, M4-ATX will shut down and re-activate only
when the input voltage is > 12V.
Engine Cranks, under-voltage and over-voltage situations. Another difficult task is
maintaining stable power to your PC. While car batteries are rated at 12V, they actually
provide voltages in between 7-11V (engine cranks) or as high as 80 volts (load dump).
Most of the times, your battery will stay at 13.5V (while car is running) but extra
precautions need to take place in order to prevent such situations. M4-ATX can operate
as low as 6V and as high as 30V while providing strict regulation on all rails along with
input voltage clamping and reverse protection.
M4-ATX User Guide
J8 shown with cable harness connected to the
motherboard ON-OFF header (pin 7 and 6)
Off-delay Hard-off
(All rails ON) (5VSB)
Standard PSU mode
5sec 1 min
5sec 1 hour
5sec NEVER
30sec 1 hour
30sec NEVER
30min NEVER
3hour NEVER
IMPORTANT: Always use the "Hibernate"
feature on your PC, never use "Standby".
NEVER use "hard-off = NEVER" settings
unless you fully understand the risks of
battery depletion. Even with safety limits
in place, your car battery might be not be
able to start your engine.
P0: In this mode, the M4-ATX behaves
like a regular ATX power supply.
P1 (recommended): Sends ON pulse to
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