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Re: Late feedback on July Update :SOLVED

Subject: Re: Late feedback on July Update :SOLVED
by tonyw on 2007/8/6 9:30:56


I don't understand this claim that PCI devices can drain the battery. There is no connection between the battery and the PCI bus, so nothing plugged into the PCI bus can drain ANY current from the battery.

I have just been measuring a spare XE board I have here. Although there is 3.02 V on the battery, there is no measurable voltage anywhere on the AGP, PCI or memory bus, and only 0.025 V on the Power Good pin to the PSU. The board was not connected to anything, it was on the desk with only the 3 V battery inserted.

If you short circuit (to ground) the Power Good signal on the AGP connector, the battery drain does not change from its 4 µA. Nothing I can do increases that current from its negligible value.

So, either there are some motherboards out there with different wiring from this XE, or the claim is untrue.
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