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From: | Pertti Kellomäki |
Subject: | Re: [avr-chat] AVRs with JTAG and without centre pad? |
Date: | Sat, 07 Mar 2009 15:34:30 +0200 |
User-agent: | Thunderbird 2.0.0.19 (X11/20090105) |
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
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