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ESD issues

Question asked by amusin on May 21, 2012
Latest reply on May 22, 2012 by amusin

Hi!

 

I have got an ADUC7034 powered by a DC-DC converter (200V->12V) and an ESD gun.

When I perform an ESD discharge near to the PCB, the microcontroller moves to several exceptions (ARM7TDMI).

I simplified my program to a very small size: POWCON init, irq/fiq disabled, loop.

A debug pin toggles in the exception handlers (different times in each handler to resolve where MCU is in).

These exceptions are: undefined and prefetch.

Can this behavior be caused by pulses on VCC/GND rails due to ESD discharges?

 

Thanx,

Alexey

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