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Thread: ITPS and PW-70: What turns it on?

  1. #1
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    ITPS and PW-70: What turns it on?

    Okay, got the ITPS connected to a Battery with a switch on the Red Input line.... flip the switch, it waits 5 seconds and then outputs 12VDC....

    Cool....

    Now I have it connected to the PW-70 (the Black to Black and Red to White)... After 5 seconds the ITPS outputs 12VDC but nothing on the PW-70 ATX plug... except the 5VSB, which is 5.02 VDC.... but all other posts on the ATX plug are dead....

    Is this because I don't have the switch wire from the ITPS (the small gage red and black) connected to an ATX switch? That is what I think and hope... but yet it also seems strange that the PW-70 is being controled by a contact (the switch wire on the ITPS) that has nothing to do with it....

    What do you guys think?

    If so, what is the best way to simulate the closing of a computer power switch? Just quickly short them then let go????

    Thanks in advance for your help.

    Oh and just to save you the time, I did search using the text "PW-70 and Output"....

  2. #2
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    The PSU is turned on by the motherboard, which is turned on by the ITPS. To force the PSU to turn on without a motherboard you need to ground out pin 14 of the ATX power connector, usually the green wire.

    The red and black wire from the ITPS connects to the place on the motherboard where you would normally connect the power switch, not to the power switch itself. Shorting the wires from the ITPS will have no effect, shorting the terminals on the motherboard will (provided the motherboard is hooked up to the PSU.)

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    Quote Originally Posted by none
    The PSU is turned on by the motherboard, which is turned on by the ITPS. To force the PSU to turn on without a motherboard you need to ground out pin 14 of the ATX power connector, usually the green wire.

    The red and black wire from the ITPS connects to the place on the motherboard where you would normally connect the power switch, not to the power switch itself. Shorting the wires from the ITPS will have no effect, shorting the terminals on the motherboard will (provided the motherboard is hooked up to the PSU.)

    Thanks None... that all sounds fimilar... so it appears the PW-70 is working correctly.... I did just notice that the PS On post on the PW-70 ATX connector is measure 2.43 VDC.... and that it the one to ground, so it makes sense...

  4. #4
    Low Bitrate cotwild's Avatar
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    delayed shutdown with ITPS and PW70a??

    i'm going to use also an ITPS and PW70a..

    is there a possibility to let carpc run for about half an hour after ignition is turned off with this??

    i think i have to solve the problem (without using an opus) by disabling power-button in winxp, that ITPS can start machine.. but doesn't shutdown..
    would ITPS still supply power if carpc isn't going down after ignition is off??

    then i will write a small tool (with vb i think) that controls if there's an input device connected to carpc. (lilliput touchscreen)
    if i turn off the ignition, lilliput doesn't get power and this shows that ignition is off. it will wait some time to synchronize files and after to shut down.. (perhaps with function to shut down immediately if wlan is not connected)

    any opinions? other idea's?
    STATUS: planing / building
    Car: 85' Audi Urquattro
    System: VIA EPIA M10000?, GPS, WLAN, DLink Radio
    Display: 7" Lilliput Touchscreen
    Power: 300W DC/AC Inverter, OPUS?
    Sound: 7.1 Dolby Digital with Audigy2 NX

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    Quote Originally Posted by cotwild
    is there a possibility to let carpc run for about half an hour after ignition is turned off with this??
    No, the ITPS times and functions are all controlled by the PIC in there.... from the factory it will totally kill power to the PW-70 after 45 seconds. The only way to change this is to burn a new PIC, which I have seen some where on this forum that somebody is able to do that..... you need a $625 Needhams programmer to do it.

    I am thinking of doing a similar thing on the input side of the ITPS, I want it to wait longer than 5 seconds to send the Power On signal to the MB.... will do this with a 555 timer circuit on the 12V switched line input to the ITPS....

    I am not sure if a similar deal could be done on the output side...

  6. #6
    Maximum Bitrate none's Avatar
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    Quote Originally Posted by dug1967
    you need a $625 Needhams programmer to do it.
    There are MUCH cheaper pic programmers than that, but it is still a huge pain.

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    Quote Originally Posted by none
    There are MUCH cheaper pic programmers than that, but it is still a huge pain.
    Like what?

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    Maximum Bitrate none's Avatar
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    Quote Originally Posted by dug1967
    Like what?
    http://www.dontronics.com/diyk149.html
    Just a quick search, didn't look into it much. This one claims compatiblilty with both kinds of PICs known to be in ITPS.

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    Quote Originally Posted by none
    http://www.dontronics.com/diyk149.html
    Just a quick search, didn't look into it much. This one claims compatiblilty with both kinds of PICs known to be in ITPS.
    Damn, I stand corrected.... now that would be a handy thing to have.... make custom ITPS PICS..... eliminate the need for the 555 timer circuit.

    Thanks for the info None...

  10. #10
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    Quote Originally Posted by dug1967
    Damn, I stand corrected.... now that would be a handy thing to have.... make custom ITPS PICS..... eliminate the need for the 555 timer circuit.

    Thanks for the info None...
    Do some googling, there are even cheaper alternatives if you look around a bit. I've even seen totally free schematics if you want to build one from scratch.

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