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'[PIC]: Power supply supervisors for PIC16F877...'
2000\08\03@141523 by Jeffrey Siegel

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I used a Mitel MIC2754 power supply supervisor to control MCLR of a
PIC16F877 board (battery powered...as little current as possible!).  It
works fine but has the annoying specification of taking between 140ms and
560ms of "reset pulse width".  This seems crazy...especially being such a
wide setting.

I've never worked with the PIC before - are there other MCLR handlers which
are super low power and give lower (or more consistent) pulse widths for
this application?

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2000\08\03@175039 by Olin Lathrop

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> I used a Mitel MIC2754 power supply supervisor to control MCLR of a
> PIC16F877 board (battery powered...as little current as possible!).  It
> works fine but has the annoying specification of taking between 140ms and
> 560ms of "reset pulse width".  This seems crazy...especially being such a
> wide setting.
>
> I've never worked with the PIC before - are there other MCLR handlers
which
> are super low power and give lower (or more consistent) pulse widths for
> this application?

I'm not sure exactly what your "power supply supervisor" is supposed to do,
but
are you aware that the PICs have brown out detect, power supply threshold
detect, and delayed startup?  For most applications the built in power up
features are sufficient so that you don't need external logic to release
MCLR once the power supply is fully up.  Unless you actually need an
external hard reset, you can usually tie MCLR to Vdd.  Check out section
12.3, "Reset", of the PIC16F87x manual starting on page 125.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spam_OUTolinTakeThisOuTspamcognivis.com, http://www.cognivis.com

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