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Author Topic: Connecting Comparator to Axon  (Read 1224 times)

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Offline airman00Topic starter

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Connecting Comparator to Axon
« on: June 08, 2009, 06:03:06 AM »
I've set up a comparator circuit and it's all working, now I want to connect the output of the comparator to an Axon digital input pin. What is the maximum voltage a digital pin can handle?
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Offline Soeren

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Re: Connecting Comparator to Axon
« Reply #1 on: June 08, 2009, 11:52:58 AM »
Hi,

This is a generic input protection useable for up to more than 30V
.

If your comparator is the kind with an open collector output it's even easier - just connect the pull up between the output and the controllers Vdd (that's what open collector outputs are specifically made for.
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Offline Admin

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Re: Connecting Comparator to Axon
« Reply #2 on: June 09, 2009, 06:26:31 PM »
Quote
What is the maximum voltage a digital pin can handle?
ATmega640 datasheet, silly :P

Without a protection circuit, it has to be less than the mcu voltage. Otherwise you'd get negative current. Although I'm sure it has some un-spec'd tolerance . . .

 


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