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ICDU40 Example Diagram

 
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James Bolver
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ICDU40 Example Diagram
PostPosted: Mon Apr 11, 2005 11:07 pm     Reply with quote
Hello,

Does anyone have an example diagram with a pic and an icsp header ?

I'm confused. I have a 47k pullup from 5V but when I plug in to program isnt VDD seeing 13V as well (albeit through the resistor). I thought the max voltage for that was 7.5V ?

Is the 47k so high that any current coming through is so small it doesnt effect the pic ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 12, 2005 1:15 am     Reply with quote
Quote:

Does anyone have an example diagram with a pic and an icsp header ?

See the CCS faq on their ICD:
http://www.ccsinfo.com/faq/?45

Also for more details, see the Microchip ICD2 poster:
http://ww1.microchip.com/downloads/en/DeviceDoc/51265e.pdf

Quote:
Is the 47k so high that any current coming through is so small it doesn't affect the pic ?

That's right. The 13v has a 47K output impedance (in effect) going
to the PIC's Vdd pin. But the +5v regulator has an output impedance of
well under 1 ohm. The +5v supply wins.
James Bolver
Guest
PostPosted: Tue Apr 12, 2005 4:30 am     Reply with quote
I see.

I guess I did not understand that one would "win" over the other. That makes sense now. Thank You.
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Sun Feb 26, 2006 8:18 pm     Reply with quote
I have spoilt 3 pcs of ICD 2 now..I was using 1K to connected btween MCLR and VDD...

Is that the main reason?
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