Brownouts

Brownouts

[Chris Read]

As a follow up to my earlier message:

I am currently working with Intel B3 parts. The datasheet makes no specific 
mention of any built in brownout detection. However, there are a set of 
timings for the reset line. Specifically, it states that it may take up to 
22us to reset the internal state machine during an erase or write cycle 
after the reset pin is asserted. My interpretation of this, in the absence 
of any explicit information, is that whilst erasing or programming, the 
reset line must be asserted a minimum of 22us before the power supply falls 
below the chip's minVcc specification, otherwise the results are 
undefined.....and we all know what that can mean.

Any thoughts/experiences?




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Re: Brownouts

[Vipin Malik]

Chris Read wrote:

> As a follow up to my earlier message:
>
> I am currently working with Intel B3 parts. The datasheet makes no specific
> mention of any built in brownout detection. However, there are a set of
> timings for the reset line. Specifically, it states that it may take up to
> 22us to reset the internal state machine during an erase or write cycle
> after the reset pin is asserted. My interpretation of this, in the absence
> of any explicit information, is that whilst erasing or programming, the
> reset line must be asserted a minimum of 22us before the power supply falls
> below the chip's minVcc specification, otherwise the results are
> undefined.....and we all know what that can mean.
>
> Any thoughts/experiences?

IMHO, you'r reading too much into the spec.

If this was my design, based on this spec that you posted, I would be happy
with this 22 us of power *up* reset. There is usually nothing to worry about
power down reset *for the flash chip*. Of course, you may want your processor
to be in reset when VCC falls out of spec to prevent it from misbehaving.

All IMHO.

Vipin


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