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VDD on PICs

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camerart

Active Member
Hi,
Some PICs have 2x VDD and VSS PINs.

Is it ok to connect sets of PINs using a TRACK under the PIC instead of an individual external TRACK.

Camerart.
 

rjenkinsgb

Well-Known Member
Most Helpful Member
It's fine, just make sure you have adequate decoupling as close as possible to the PIC.
If anything, that can be more important to avoid problems.

Also, keeping power and ground close together under each IC helps reduce inductance so lowers noise more.
 

JonSea

Well-Known Member
Most Helpful Member
The important thing is that ALL power and ground pins be connected. They are not optional.
 

dknguyen

Well-Known Member
Most Helpful Member
I think he's been rather pessimistic, obviously you need something more on a 50W power amplifier, but for a processor you're be hard pushed to need something larger nearer the chip.
It is poorly worded. I think the author is just saying don't omit the seemingly vanishing, tiny capacitors.

Myself, I was talking about the number of tiny capacitors per power pin.
 
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