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Okay, I have more data on the full system, and more data on what's=20
causing the problem.   Crude diagram attached.

The power conditioner has filtering caps, reverse protection, etc but I=20
don't know the specifics.  I do know that B draws approx 160mA, and C=20
draws approx 65mA.  C is the device of interest here... the one with the=20
EEPROM getting corrupt.  C also has another ground for a motor controller.

C communicates with one device by  TTL-level data and another by RS232=20
signals.  However, there is also another serial interface to a laptop. =20
The signals are TTL-level out of the box, but are converted to RS232 by=20
an external adapter.

Here's the enlightening info... apparently the EEPROM corruption seems=20
to be linked to disconnecting & connecting the TTL-to-RS232 adapter=20
board (the D-E connection in the diagram).  The protocol for the laptop=20
telling C to update certain parameters (changing some EEPROM values) is=20
pretty basic -- a 1-byte command, a 2-byte parameter value (correlates=20
to a specific EEPROM address), and a 1-byte value to update.  I'm=20
wondering if plugging in the D-E connection is causing either a surge on=20
the power line (as the TTL-to-RS232 interface uses 5V provided by C), or=20
perhaps the connection causes a "switch-bounce" type effect that sends=20
random pulses when being plugging in, with some of those pulses being=20
interpreted as commands to update parameters.  Data rate is 19200.

For a test I can disable the EEPROM-write mechanism in C (so I'd receive=20
the command, but do nothing) and see if that stops the problem.  If so,=20
I can add checksums etc to that protocol.

Yes, I should still find out how much filtering is in the system, and=20
add to C if more is needed, but thinking that may not be this specific=20
issue now.

But does this provide any other clues?  Mark Jordan mentioned ground=20
loops, so I'm wondering if the secondary ground to C may be causing some=20
of that.

Cheers,
-Neil.



On 10/28/2014 3:40 PM, RussellMc wrote:
> Your small caps have power supply holdup times in the order of a few
> milliseconds. If no spikes that drop out the supply completely are longer
> than this you may be getting noise induced by other means. But without a
> more detailed look I'd not be at all surprised if direct supply dropout w=
as
> the poblem. At that stage your PIC may be surviving brownout internally
> with its reset and disable mechanisms, but if you cannot guarantee the
> voltage-time profiles on the external eeprom pins it is on its own.
>
> For a controller's internal brownout mechanism to protect externally
> connected parts it must guarantee the relative state of all interconnecte=
d
> pins on the potentially affected device, AND the device itself must
> guarantee that it can survive  a multi transition brownout on the power
> rails and any other pin that is not guaranteed by the PIC.
>
> If the EEPROM spec says it will survive random violence on its supply lin=
es
> and any other non-PIC-connected pins, if the PIC connected pins are manag=
ed
> well, AND if the PIC guarantess that it will not only survive said violen=
ce
> but guarantee the state of the interconnected pins during that period, th=
en
> all may be OK. If both of those guarantees are not specifically given the=
n
> you have no reason to be certain that corruption should not occur.
> Should-not and will-not are variably well correlated in reality :-).
>
>
>
>      Russell


--_003_5464CA612060604narwaniorg_
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