Re: [avr-chat] AVRs with JTAG and without centre pad?

[Pertti Kellomäki]

Joerg Wunsch wrote:
> Pertti Kellomäki <address@hidden> wrote:
> > Otherwise, I guess I need to learn to deal with the centre pad.
> > I gather it is mainly a heat sink, so does placing some vias
> > under the component and soldering from the other side work?
>
> It's only present on the smallest packages available. 

Ok, thanks. Seems I was confused by the pinouts in Atmel's datasheets.
For example, the ATmega32A gives a single pinout for TQFP/MLF,
with a note saying "Bottompad should be soldered to ground", which
lead me to think that there is a centre pad on both packages.
The ATmega128 datasheet is more explicit: "The Pinout figure applies
to both TQFP and MLF packages. The bottom pad under the QFN/MLF
package should be soldered to ground."

Sorry for the confusion. The last time I did anything more
serious in electronics was in the 1980's, so I am still finding
my way around SMT components.
--
Pertti