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ICD-U40 doesn't work

 
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Lorenzo



Joined: 23 Apr 2004
Posts: 14
Location: Pescara (Italy)

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ICD-U40 doesn't work
PostPosted: Mon Jun 21, 2004 12:53 am     Reply with quote
I have to program a 16LF648A with 3V power supply but
ICD-U40 rarely works.
With a supply voltage higher it works well.
Please help
Lorenzo
MGP



Joined: 11 Sep 2003
Posts: 57

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PostPosted: Wed Jun 23, 2004 4:28 pm     Reply with quote
You might check the spec sheet for the 16LF648A, but I think the chip needs ~4.5V to do a bulk erase. Since the ICD needs to do a bulk erase to load your program into the chip, it could be the problem. I know a lot of people have missed this in the specification for most of the 18F chips and it can bite you on a 3V design when you need to program the chip in-circuit.
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