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'[PIC] 16F287 power connections'
2012\05\21@031455 by Goran Hosinsky

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Must VDD and VSS be connected to both sides of the 40 pin 16F887 or is one side enough? VDD is on pin 11 and 32, VSS on 12 and 31.
Goran, Canary Island

2012\05\21@044603 by Jan-Erik Soderholm

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Hi.

All pins should be connected, that is what they are there for.
I thought the datasheet was clear on that point, maybe not. :-)

Jan-Erik.


Goran Hosinsky wrote 2012-05-21 09:14:
> Must VDD and VSS be connected to both sides of the 40 pin 16F887 or is
> one side enough? VDD is on pin 11 and 32, VSS on 12 and 31.
> Goran, Canary Island

2012\05\21@100044 by Electron

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At 09.14 2012.05.21, you wrote:
>Must VDD and VSS be connected to both sides of the 40 pin 16F887 or is
>one side enough? VDD is on pin 11 and 32, VSS on 12 and 31.

If we believe Microchip (and we only have good reasons to) You MUST connect all of them EVEN JUST FOR PROGRAMMING!

2012\05\21@104905 by Kerry Wentworth

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Electron wrote:
> At 09.14 2012.05.21, you wrote:
>  
>> Must VDD and VSS be connected to both sides of the 40 pin 16F887 or is
>> one side enough? VDD is on pin 11 and 32, VSS on 12 and 31.
>>    
>
> If we believe Microchip (and we only have good reasons to) You MUST connect all of them EVEN JUST FOR PROGRAMMING!
>
>   And if we believe our lying eyes, we will see that only 1 VDD and 1 VSS need to be connected!

Kerry

2012\05\21@105315 by Goran Hosinsky

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Thanks! I would say that the problem is not the datasheet but my reading of the 300+ pages.
Goran

On 2012-05-21 09:46, Jan-Erik Soderholm wrote:
{Quote hidden}

>> Goran, Canary Island

2012\05\21@120056 by Spehro Pefhany
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At 10:53 AM 5/21/2012, you wrote:
>Thanks! I would say that the problem is not the datasheet but my reading
>of the 300+ pages.
>Goran

I'm not sure it's in there anyhow. Certainly not in the 16F287 datasheet. ;-)

2012\05\21@120209 by Spehro Pefhany

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At 10:46 AM 5/21/2012, you wrote:
>Electron wrote:
> > At 09.14 2012.05.21, you wrote:
> >
> >> Must VDD and VSS be connected to both sides of the 40 pin 16F887 or is
> >> one side enough? VDD is on pin 11 and 32, VSS on 12 and 31.
> >>
> >
> > If we believe Microchip (and we only have good reasons to) You
> MUST connect all of them EVEN JUST FOR PROGRAMMING!
> >
> >
>And if we believe our lying eyes, we will see that only 1 VDD and 1 VSS
>need to be connected!
>
>Kerry

It's one of those things like running a PIC on a solderless breadboard with an external
crystal and without a ceramic bypass cap- it usually works, but probably compromises a few
things.

2012\05\21@161138 by Dwayne Reid

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At 08:46 AM 5/21/2012, Kerry Wentworth wrote:

> > If we believe Microchip (and we only have good reasons to) You
> MUST connect all of them EVEN JUST FOR PROGRAMMING!
> >
>And if we believe our lying eyes, we will see that only 1 VDD and 1
>VSS need to be connected!

Yeah - but its one of those things that can so easily bite you when you least expect it.

Great rule of thumb: if you want the highest-possible reliability, even when programming, do connect all Vss and Vdd pins to their proper nodes.

dwayne

-- Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2012\05\21@163524 by Kerry Wentworth

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Dwayne Reid wrote:
{Quote hidden}

Kerry

2012\05\21@173803 by IVP

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> both SHOULD be connected.  But they don't HAVE to be,
> which was the question

Distance of an I/O or OSC pin from Vss or Vdd could/will have
consequences won't it

2012\05\21@181610 by Kerry Wentworth

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IVP wrote:
>> both SHOULD be connected.  But they don't HAVE to be,
>> which was the question
>>    
>
> Distance of an I/O or OSC pin from Vss or Vdd could/will have
> consequences won't it ?
>   Possibly.  I don't know about the 16F287 in the subject line, but the question I answered was about the 16F887.  The 2 ground pins are connected together inside the chip, as are the 2 VDD pins.  So, how far is a VDD pin from the power supply?  1"?  3"?  10"?  And the 2nd VDD pin is another .3".  Does it really matter?  For that matter, if both are connected, it is possible the board will end up designed such that all other circuitry draws its power through the internal PIC connection.  That would also have an effect.  And 2 VSS pins would form a ground loop, also having an effect.

Good design must take many things into account.

Kerry

2012\05\22@174003 by Jim Franklin

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Ah, so you are the one who read it all then!
You must tell me what it says someday.

-Jim


-----Original Message-----
From: .....piclist-bouncesKILLspamspam@spam@mit.edu [piclist-bouncesspamKILLspammit.edu] On Behalf Of
Goran Hosinsky
Sent: 21 May 2012 15:53
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] 16F287 power connections

Thanks! I would say that the problem is not the datasheet but my reading of the 300+ pages.
Goran

On 2012-05-21 09:46, Jan-Erik Soderholm wrote:
{Quote hidden}

>> Goran, Canary Island

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