Re: stealing power from the serial bus

From: John (
Date: 2001-06-01 23:40:59

john/lori writes:
>Suppose you want to steal a little power from the serial bus.

Feed all lines through diodes into a small capacitor (you want it small so
you don't drag everything low as it charges when power is first applied).

You won't get 5V this way, but anything that will run on power stolen from
the serial bus is going to be CMOS, and that tends to run happily at fairly
low voltages anyway.

Steal VERY little power.  These are open collector signals with resister
pull-ups, if I remember correctly.  You won't be able to draw much current
before the lines get pulled too low, and everything stops working.

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