Yep... But 70mV might be a little low? Having +/- 5-10mV on the comparator accuracy means a possibility of a miss-trigger. My FETs should handle this for quite some time so I don't think it will be too bad. I'll have to make a proto and see. Motor-stall is what I really have to protect from as system uses 4 FET's each capable of 14 Amps and motors rarely take more than 10 in my application :) Stall-current will be very high compared to normal running but I might encounter another problem. Stall-current would not bne high enough to trigger over-current on a small enough motor!!! LOL = Toast! KreAture ----- Original Message ----- From: "Olin Lathrop" To: Sent: Sunday, June 22, 2003 9:35 PM Subject: Re: [PIC]: Behaviour of PIC16F62x with over-voltage on comparator? > > Problem is: > > > > FET off = 16 Volts. > > FET on = 0-70 mV. > > > > I need to compare the voltage when FET is on to a set reference of 70 > > mV. If Voltage across FET is abowe 70mV I have a over-current condition > > and should turn FET off. > > So what exactly is the problem? Sounds like you only need to compare to > 70mV. You should easily be able to clamp to something will under 5V > without effecting the voltage at 70mV. > > > ***************************************************************** > Embed Inc, embedded system specialists in Littleton Massachusetts > (978) 742-9014, http://www.embedinc.com > > -- > 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.