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Thread: Sleeping Mini/P1900 Question

  1. #1
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    Sleeping Mini/P1900 Question

    Well I've joined the in car Mac Mini crowd now and I've got a possible issue I'd like to try and understand. I've posted the following on the Carnetix boards but am also posting it here in case you all might have some insight or if MikeH checks here first:
    ------------------------------------------------------------------------

    "I completed my install a couple of days ago and have been using the P1900 to sleep the Mini. Everything has been fine and it all has appeared to work normally.

    This morning when I went out to start the car, the starter sounded weak as if the battery voltage was low but the car did start. I know that the Mini is sleeping without problems in many people's cars so I'm a little puzzled. By the way, the Mini was still asleep and had not shut down. It awoke without a problem.

    I also have my Xenarc 8" screen connected to the secondary output (set to 12v) on the P1900.

    One thing I have noticed is that the USB bus stays on even when the Mini is sleeping. I have one of those USB cables with obnoxious blue LED's in it and they shine brightly even when the Mini is asleep, meaning they are on all night long. This is no different than my Via Epia M10000 which also kept the USB bus on and my GPS unit powered at all times.

    I didn't worry about this too much because they're LED's and the P1900 has protection against voltage drawdown.

    Long story short, am I missing anything that I should check to ensure that some drain on the power supply is not occurring? Is there a way to check to see if my P1900 properly cuts off power if the voltage drops too low (I don't have a variable voltage power supply)?"
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  2. #2
    FLAC
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    Bugbyte,

    Congrats on finally getting things up and running!
    Quote:
    I also have my Xenarc 8" screen connected to the secondary output (set to 12v) on the P1900.
    Double check to make sure the Secondary Output is not jumpered for "always on" (JP3) operation. Also make sure the Secondary Output Control (JP4) is set for DLYON. If it is set for PRI OUT (which means the Secondary Output is ON when the Primary Output is ON, and since you are using Standby (sleep) the Primary Output never turns off!), your Secondary Output will never turn off. If your 8" Xenarc draws any current when it is off, it will be sucking it from the P1900 and draining your battery.
    Quote:
    One thing I have noticed is that the USB bus stays on even when the Mini is sleeping.
    How are you powering your USB hub? Do you have a P5V or are you directly connecting the hub to the mini? I would suggest you use the P5V and let it disable power to the USB hub when your system goes to sleep. Some USB hubs can draw significant current even with nothing connected. If you have a GPS mouse connected, that's another ~100mA. If you're not careful you'll be drawing 300-400mA total while in sleep. If you've been subjecting your battery to this slow drain for while (with your previous system) it may already be degraded and not able to be fully recharged.
    Quote:
    Is there a way to check to see if my P1900 properly cuts off power if the voltage drops too low (I don't have a variable voltage power supply)?
    Do you have a digital voltmeter? Can you measure the battery voltage in the morning before you crank your engine? The P1900 will cut power to the mini if, while in Sleep mode, the battery drops below 10.5V. However, as soon as you turn on your ignition, the P1900 goes into startup mode and ignores the battery voltage since it will dip during engine cranking.
    MikeH

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    Thanks for the reply, Mike. I answered back on the Carnetix forum.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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