Post by thread:brownout (was Hung-up PIC (was WHAT IS THIS?))

Jim Ham's most learned opionion was: > > > It's actually much worse that that. If the part includes EEPROM, > there is a good possibility that the EEPROM will be written. I know > that it happens with 16F84's and I've been informed by another user > that it happened on his product that uses 16C84's. It would seem > some type of brown-out protection is mandatory for those parts with > EEPROM on board. My product is through-hole, so I'm using the Dallas > DS1233D. I've seen the Maxim part mentioned on this list several > times. By the by, on my product the watchdog would not reset the > part after brownout even though it was enabled. It makes me wonder > what its for... How much are you paying for the Dallas DS1233D in real quantities? I've been really successful with a simple PNP transistor as a brownout device (ala one of the app notes) which costs about 7 cents US in real quantities, $0.18 for ten. There's been a long discussion about what the watchdog is for in the last few weeks... Look it up in the archive -- Lawrence Lile Download AutoCad blocks for electrical drafting at: http://members.sockets.net/~llile/index.htm