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ICD 3V PROBLEM

 
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JULIEN LAFFITTE



Joined: 28 Mar 2007
Posts: 20

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ICD 3V PROBLEM
PostPosted: Wed Mar 28, 2007 10:07 am     Reply with quote
Hello,
I use a PIC18LF2523 at 3V and i want to program him with ICD-U40.
The MCLR pin is connected to a 10K resistor to 3V (decoupled by a 100NF capacitor). B7 and B6 are only conected to the ICD.

The ICD not program all the time and when he is programming a lot of errors occur.

What's wrong??
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Mar 28, 2007 11:20 am     Reply with quote
Quote:
The MCLR pin is connected to a 10K resistor to 3V.

The CCS FAQ page says to use a 47K resistor:
http://www.ccsinfo.com/faq.php?page=icd_connection
However, that's for a 5v circuit. The equivalent resistor for a 3V
circuit would be 33K.

Read this thread. One person says that he had a 10K resistor
installed and it didn't work. He changed to 47K and it started working.
http://www.ccsinfo.com/forum/viewtopic.php?t=24925&highlight=10k+47k
kender



Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley

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Re: ICD 3V PROBLEM
PostPosted: Wed Mar 28, 2007 8:00 pm     Reply with quote
JULIEN LAFFITTE wrote:
decoupled by a 100NF capacitor

Remove the capacitor from MCLR too.
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