Dear Dan,

Thank you for your quick reply.  I operate the data flash at min supply
2.7V.  The IC is specs at 2.7 to 3.6V.  I don't think the data flash will
work at 2.3V (0.4V down).

I actually put the cap at the input of a 2.7V regulator to keep the voltage
at the flash regulated after the unit is powered down.  I already tried with
470uF cap, but sometimes the flash is still corrupted (less though).  Is
there any thing I can do in software?  Anyting else?

Thanks again,
Thomas


>From: Dan Michaels <oricom@USWEST.NET>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE]: Help!  Data Flash corruption
>Date: Thu, 30 Aug 2001 16:02:48 -0400
>
>Thomas N wrote:
>.........
> >Is there any way to overcome this problem?  Any work-around?  I tried to
>put
> >the big cap at the data flash supply to retain its power (for 10ms), but
> >during the write operation, the data flash consumes lots of current (20
>mA),
> >so it's too much for the cap.
> >
>
>I = C dv/dt
>
>.02A / 470uF = 42v/sec = 0.4v / 10msec
>
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