VDD on PICs

[camerart]

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.

 

[Pommie]

Why wouldn't it be OK?

Mike.

 

[camerart]

Why wouldn't it be OK?

Mike.

Hi M,
A question answered by another question
C.

 

[Ian Rogers]

Yes!!! That's how I do it.. AND!! the trace moves on and powers other devices as well..

 

[camerart]

Hi I,
That's what I've been doing, but wanted a second opinion, thanks.
C.

 

[rjenkinsgb]

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.

 

[dknguyen]

Sure hope so since that's what a powerplane is.

 

[JonSea]

The important thing is that ALL power and ground pins be connected. They are not optional.

 

[dknguyen]

The important thing is that ALL power and ground pins be connected. They are not optional.

Not to each other though.

 

[camerart]

Sure hope so since that's what a powerplane is.

Hi D,
Will you explain what you mean please?
C.

 

[dknguyen]

Hi D,
Will you explain what you mean please?
C.

You know how you dedicate a ground plane on a PCB is? A power plane is the same thing but for power.

 

[JonSea]

Not to each other though.

I thought that point kind of went without saying

 

[camerart]

You know how you dedicate a ground plane on a PCB is? A power plane is the same thing but for power.

Hi D,
Of course, rather obvious really.
C.

 

[camerart]

I thought that point kind of went without saying

Hi J,
In normal circumstance that's true, but with me it needs saying got it now.
C.

 

[JonSea]

You may find this a good guide to avoid common problems when using 16F or 18F PICs. It's based on reading many forum posts and observing comnon problems:

Commandments Fou Using PICs

 

[camerart]

You may find this a good guide to avoid common problems when using 16F or 18F PICs. It's based on reading many forum posts and observing comnon problems:

Commandments Fou Using PICs

Hi J,
I normally follow most of those commandments although I usually only have one 0.1uF Cap/PIC
Thanks, C.

 

[dknguyen]

Hi J,
I normally follow most of those commandments although I usually only have one 0.1uF Cap/PIC
Thanks, C.

That won't work on chips with more horsepower.

 

[camerart]

That won't work on chips with more horsepower.

Hi D,
Ok.
C.

 

[Nigel Goodwin]

Hi D,
Ok.
C.

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.

 

[dknguyen]

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.