Subject: Re: 8051-compatible chip drawing ~200mA. Should be < 20mA
Date: Tue, 3 Dec 2002 10:48:09 -0000
NNTP-Posting-Date: 3 Dec 2002 10:48:10 GMT
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"siliconpi" wrote in message
> I am working in a lab and we usually use a power supply which outputs
> a constant 5V to power our circuits. The project I'm working on
> requires the circuit to run off a 9V battery.
> I measured the current draw from the power supply and it was ~200mA,
> out of which the 8051 type chip is taking in ~150mA. I checked by
> putting the 8051 in another breadboard and hooking only the Ground and
> Vcc connections.
> I have tried the: ATMEL AT89C51, Intel 8751H chips - both of which
> state in their datasheets that the maximum value of Icc is 20mA. I
> dont think I've hooked it up properly - or else a whole batch of these
> were incorrectly used by others and therefore went bad.
> BTW, they work fine. I can program them, use them, juggle with them,
> throw them around, beat my head on them - no problem! ;)
are you running the chip on 9V then? not recommended ! *pop*
if not then you must have some sort of regulator inline, check that isnt
drawing a load of current.
if its not that then you have a duff I.C. or duff power supply/meter.