Tested now. It works. :-) Thanks for the idea btw, I am much more assured now. KreAture ----- Original Message ----- From: "Bob Barr" To: Sent: Sunday, June 22, 2003 8:41 PM Subject: Re: [PIC]: Behaviour of PIC16F62x with over-voltage on comparator? > On Sun, 22 Jun 2003 16:56:13 +0200, Kyrre Aalerud > wrote: > > >It didn't cause damage, but the pin did conduct. About 25mA wendt through. > >The port is fine and everything seems to work as usual. This was too bad > >though as I now need to clamp the FET-voltage before feeding it to the > >comparator. (I was trying to check for over-current without external > >OP-AMPS...) > > > > The port may appear to be fine but you could have blown the clamp > diode and not know it. I've got no data to back this up but 25mA > sounds like a lot of current for a clamp diode. > > I'd suggest testing that pin for proper clamping with a > current-limited variable voltage source. If the clamp diode's blown, > it won't limit the voltage properly and further damage to the chip > could result later. > > > Regards, Bob > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.