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'[PIC]: Do F877's get hot when programming?'
2001\06\29@153750 by Kev

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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

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2001\06\29@155019 by Nick Veys

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Shouldn't get hot at all, only time a chip has ever gotten hot
programming was when I had my software set incorrectly... Luckily it
didn't fry.

.....nickKILLspamspam@spam@veys.com | http://www.veys.com/nick


> {Original Message removed}

2001\06\29@171129 by Bob Ammerman

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----- Original Message -----
From: "Kev" <KKloppspamKILLspamEROLS.COM>
To: <.....PICLISTKILLspamspam.....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)

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2001\06\29@172941 by Hartung, Greg

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This has only ever happened to me if I put the chip in backwards.  oops.

-----Original Message-----
From: Bob Ammerman
To: PICLISTspamspam_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@KKloppKILLspamspamEROLS.COM>
To: <KILLspamPICLISTKILLspamspamMITVMA.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)

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2001\06\29@185046 by Hartung, Greg
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  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}

2001\06\29@201358 by Olin Lathrop

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> 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, TakeThisOuTolinEraseMEspamspam_OUTembedinc.com, http://www.embedinc.com

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