AVR-Chat

----- Original Message ----- 
From: "Randy Ledyard" <rll_groups@adelphia.net>
To: "AVR-Chat" <AVR-Chat@yahoogroups.com>
Sent: Saturday, May 13, 2006 7:29 PM
Subject: [AVR-Chat] Mega644 TQFP Package Pinout - Vcc/Gnd Question


> Hello
>
> I'm working on a board for a Mega644 in TQFP format.
>
> I was wondering if I need to connect all of the Vcc pins together? Are 
> they
> tied together internally in the chip? The same question applies to the Gnd
> pins as well.
>
> I looked in the Datasheet, using the search term "VCC" and found nothing 
> to
> help me there...
>
> By the way, I am aware of the AVCC and AGND issues/considerations - I just
> haven't worked with the TQFP package before, and need to know if all of 
> the
> Vcc pins are connected internally. I could measure it with a meter, but 
> I'd
> be afraid of possibly blowing the chip.
>

I always decouple each Vcc pin to the nearest Gnd pin, and distribute Vcc 
and Gnd with nice wide tracks to the capacitors. Don't depend on the 
internal connections, they brought the supplies out to different pins for a 
reason!

Leon 

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