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atmega16 adc question
- 11-09-2005
November 9, 2005, 11:20 pm

I'm working on a project using an Atmega16 mcu. It's adc is being used to
measure the battery voltage via a divider. A potential problem is that when
the board is switched on there is a short time that the voltage is applied
to the adc pin before the switching power supply brings the mcu up. My
question is whether this is a problem, and if so how to solve it. Thanks for
your assistance.
Mark

Re: atmega16 adc question

to
applied
on. A
a
corresponding
damage
The problem is that the mega is a cmos device, and you can cause SCR
latchup, potentially killing the chip-
the mega has protection diodes from the pins to the supply rails, this is
sufficient if the top resistor of the divider is >100K ohms; if not maybe
add 2 schotkey diodes from the pin to the supply rails to help the small
internal diodes out.
regards
Anthony C Smith MAES MinstSCE
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