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Is the VDD connection on ISCP header neccessary for ICD-40?

 
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blak3r



Joined: 11 Jan 2004
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Is the VDD connection on ISCP header neccessary for ICD-40?
PostPosted: Fri Jul 16, 2004 12:23 pm     Reply with quote

I have a small circuit with a small power supply that can only provide 10mA. Vdd on the circuit is 3.3V and my PIC is a 16LF628.

Since i have a ICD-40U which is self powered from the USB port. Is it okay to not connect the VDD Pin on a ICSP header?

Also, are there any other things i should know about since my operating voltage for all my ICs is 3.3V?
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Chas
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PostPosted: Fri Jul 16, 2004 1:06 pm     Reply with quote

Yes, you need to connect your Vdd to the ICD interface. It is used by the ICD for reference when it drives the MCLR line. Look at the post in this forum about about "different frequencies" which is a couple of lines below this one.
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PostPosted: Fri Jul 16, 2004 2:40 pm     Reply with quote

Hmm... So if VDD is operating at 3.3V then does it drive the MCLR line with a 3.3V logic level opposed to 5V?

Thanks
bdavis



Joined: 31 May 2004
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Location: Colorado Springs, CO

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PostPosted: Mon Aug 02, 2004 5:01 pm     Reply with quote

I think /MCLR is driven to 12 to 13 volts from the ICD when programming, not 5V or 3.3V.
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