Sajjadkhan
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I want to know if PIC fails to start then what voltage will be on its pins. i have connected 2 pins of pic to LM317 with external transistors for battery charging.
when
pin1=1 and pin 2 =0 then, voltage =14.4V
pin1=0 and pin 2 =1 then, voltage =13.8v
pin1=0 and pin 2 =0 then, voltage =30v and a current limiter limits the current and acts as a constant current source. but this stage is not for too long else battery will damage.
so if pic fails and there is 5 v on any pin then i am safe but if 0v appears then puffffff.
when
pin1=1 and pin 2 =0 then, voltage =14.4V
pin1=0 and pin 2 =1 then, voltage =13.8v
pin1=0 and pin 2 =0 then, voltage =30v and a current limiter limits the current and acts as a constant current source. but this stage is not for too long else battery will damage.
so if pic fails and there is 5 v on any pin then i am safe but if 0v appears then puffffff.