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will till con ume about 100mA on the 5V rail. All power upplie have 5VSB (5V
tandby) mode o that they can i ue at lea t a PSON ignal. When the computer i in
the u pend mode, it will con ume even more power, becau e the RAM need to be
powered at all time . The power con umption in the u pend mode i few watt .
No atter how big your battery is, it will eventually drain your battery in a atter of days.
The M1-ATX i addre ing the e i ue by cutting off the 5VSb rail after a pre-defined
amount of time ( ee jumper chart). When 5V b i alway active (HARDOFF=Never), M1-
ATX watche the battery level. When battery level drop below 11V for more than one
minute, M1-ATX will hut down and re-activate only when the input voltage i > 11V.
E gi e Cra ks, u der-voltage a d over-voltage situatio s. Another very difficult ta k
i maintaining table 3.3, 5, 12 and -12V power to your PC. While car batterie are rated
at 12V, they actually can provide voltage in between 7V (during engine crank ) or a
high a hundred of volt (load dump condition ). Mo t of the time , your battery will tay
at 13.5V (while car i running) or 12V (when car i off), but extra precaution need to take
place in order to prevent under and over-voltage ituation . M1-ATX can operate a low
a 5.7V and a high a 26V while providing trict regulation on all rail with input voltage
clamping and rever e protection.
Loud amplifier pops whe PC starts. If your PC i connected to your car amplifier, you
will hear a loud pop when the computer i fir t tarted. The M1-ATX ha an ‘anti-thump’
control that will keep your amp OFF while the PC tart . Simply connect J2 to your
amplifier remote control pin to activate the ‘anti-thump’ feature.
2.0 Mode of operatio
The M1-ATX perform everal timing routine and take action a follow :
(NOTE: When all config jumper are removed, M1-ATX will be in the “dumb PSU mode”,
no ignition timing, no HARDOFF. M1-ATX will end a gratuitou “ON” ignal to the M/B
when power i applied for the fir t time. Do not connect J8/J6 to the M/B on/off witch if
you don’t want your PC to be tarted automatically)
1) Ignition=OFF. Nothing happen . M1-ATX i waiting for ignition ignal .
2) Ignition=ON. M1-ATX wait for 3 econd then turn on the 5V b rail. After another 1 econd the MCU
end an “ON” ignal to the motherboard via the 2 wire connected to the motherboard’ ON/OFF pin .
The motherboard will turn ON and your y tem hould tart booting.
3) Ignition=ON during driving: Nothing happen . Your computer will remain ON.
4) Ignition=OFF. M1-ATX wait for “OFFDELAY” in econd ( ee jumper chart on Page 2) and then it turn
the motherboard OFF by ending a ignal to the motherboard’ ON/OFF witch. Your computer hould
turn off gracefully ( hutdown procedure). During thi time, power will till be available for your PC to
perform hutdown.
5) Ignition=OFF. 5VSB will till be provided for another “HARDOFF” econd ( ee jumper chart on Page2).
In the event where the hutdown proce i longer than “HARDOFF”, power will be hut down hard,
turning off your computer’ power. If ignition i turned on during thi tep, you computer will tart again. If
M1-ATX U er Guide Page 3
