For low power parts, better use TI MSP430 family. It gets much lower Quiescent current and starting current than Microchip. Extremely useful for battery powered devices. Funny N. New Bedford, MA http://www.AuElectronics.selfip.com ----- Original Message ---- From: Robert Rolf To: Microcontroller discussion list - Public. Sent: Friday, November 30, 2007 10:17:55 AM Subject: Re: [PIC]: BOD Issue, was Re: [PIC] a/d sample acquisition during sleep Bob Axtell wrote: > Bob Axtell wrote: > >>Yes, BOD uses some power, but certainly is worth it to ensure proper >>startup. I have >>been burned a few times without it, especially remote sensors whose >>powerup schemes >>are suspected to be poor at times. >> >>--Bob A >> > > I might add that I have been unable to use the PIC10F series on remote > sensors because of > unreliable startup due to the lack of an internal BOD. I compared a > PIC12F629 with BOD > to a PIC10F200 without BOD, and a reliable startup is achieved 100% of > the time on the F629 > whereas the PIC10F200 reliably started up about 30% of the time. > > Microchip, I hope you are reading this. Yes, I hope they are. 16F877 DC specs: BOD reset current: typ 85uA, Max 200uA!! versus http://www.semicon.panasonic.co.jp/ds2/SAG00010AED.pdf MN13811-G Idd - 1uA! for VCC=5V A MUCH better part for low power users. Used to be carried by Digigkey, but no longer stocked. Pity, because I used them a LOT in my low power stuff. In other words, for really LOW power standby, you MUST use an EXTERNAL LVD device with better specs than the Microchip BOD. Anyone know of a better device or source for the MN13811 (now that Digikey has dropped the part)? Robert -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist