Post by thread:[PIC]: Do F877's get hot when programming?

I'm trying to build a F877 programmer but having limited success. How hot will this chip get during programming? I was barely able to keep my finger on the chip due to heat. Will I be able to scope the Oscillator and see it running if the unit works? Thanks, Kev -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

----- Original Message ----- From: "Kev" <KKloppKILLspamEROLS.COM> To: <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Sent: Friday, June 29, 2001 3:39 PM Subject: [PIC]: Do F877's get hot when programming? > I'm trying to build a F877 programmer but having limited success. > > How hot will this chip get during programming? I was barely able to keep my > finger on the chip due to heat. This is not a good thing. > Will I be able to scope the Oscillator and see it running if the unit works? Nope, the oscillator doesn't run during programming. > Thanks, > Kev Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

This has only ever happened to me if I put the chip in backwards. oops. -----Original Message----- From: Bob Ammerman To: PICLISTspam_OUTMITVMA.MIT.EDU Sent: 6/29/01 5:07 PM Subject: Re: [PIC]: Do F877's get hot when programming? ----- Original Message ----- From: "Kev" <@spam@KKloppKILLspamEROLS.COM> To: <KILLspamPICLISTKILLspamMITVMA.MIT.EDU> Sent: Friday, June 29, 2001 3:39 PM Subject: [PIC]: Do F877's get hot when programming? > I'm trying to build a F877 programmer but having limited success. > > How hot will this chip get during programming? I was barely able to keep my > finger on the chip due to heat. This is not a good thing. > Will I be able to scope the Oscillator and see it running if the unit works? Nope, the oscillator doesn't run during programming. > Thanks, > Kev Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body

I didn't have enough time to complete here... The cause for this for hot chips is usually Vdd, Vss, and Vpp on the wrong pins. In addition to the wrong chip orientation, it can also be caused by the wrong config in your programming software or a programmer that doesn't support a 16F877. {Original Message removed}

> How hot will this chip get during programming? I was barely able to keep my > finger on the chip due to heat. There is definitely something wrong. When I program an 877 with a Picstart Plus there is no noticeable temperature rise. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, TakeThisOuTolinEraseMEspam_OUTembedinc.com, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body