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Thread: m2-ATX IGN ?

  1. #1
    Maximum Bitrate redls1bird's Avatar
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    m2-ATX IGN ?

    Currently my carpc is running off of a Delta electronics 100w psu (what it came with). I am looking at buying a M2-ATX since it offers more power on every line than my current psu. My question is on the ign. input, does it have to have constant voltage/current just to turn it on? Or can it be pulsed once turning it on, and letting it run its normal shutdown procedure programmed into it? I ask because I want to run an additional line with diode from my keyless entry module so that when I unlock the doors the M2 will see it, and begin to boot before the car is on. This way, there will be less time to music/gps lock etc and depending on how long it takes me to get to the car, maybe none at all.
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  2. #2
    Raw Wave Rob Withey's Avatar
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    constant voltage to switch it on.
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  3. #3
    Maximum Bitrate redls1bird's Avatar
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    How long must it remain powered befor you can cut it off? It cant be too long or otherwise it would kill your pc during boot if you only cycled your key.
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  4. #4
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    constant voltage - if you remove the power on the ign line, it wii shut the psu down.
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  5. #5
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by redls1bird View Post
    How long must it remain powered befor you can cut it off? It cant be too long or otherwise it would kill your pc during boot if you only cycled your key.
    I don't know the specifics about the m2atx, but generally the shutdown controllers have a lockout period after switching on during which they will not initiate a shutdown. This is to cater for the boot time.

    You can generally take the ign line and and down as you like. When it is up for a specified period of time the power supply will power the pc up. After the lockout period, when the ign line goes low for a certain time whilst the pc is on it will initiate a shutdown. Pulsing the line will likely have one of two effects:

    a) The pulse is too short to trigger the power supply to power up.
    b) The pulse switches the power supply on, and once the power supply is able to switch off, it will immediately initiate a shutdown.
    Old Systems retired due to new car
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  6. #6
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    Without complicating things that was what I was saying.

    You need constant voltage on the ign line to keep the pc running

    hehe
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