Single-sided Arduino-Leonardo board

[CrossRoads]

Not getting what you think is the problem frank.

[fm]

The vinciDuino board is up and running beautifully:
- UART working
- USB working
- I2C operational
- ISP
- digital IO, well I've only tested D13.
- all supplies are good (external unregulated, USB, and UART).

Little picture from the vinciDuino board saying its first hello world!

[tormentor]

...

[Chagrin]

Not getting what you think is the problem frank.

The ATMega32U4 has a thermal pad on its underside.

Oddly the datasheet makes no reference to it whatsoever except for the footprint drawing which shows that it is present.

[CrossRoads]

http://www.atmel.com/Images/7766S.pdf
See sections 7.2 & 7.1.

The exposed pad only applies to the QFN44 (quad flat no-lead package) and not the TQFP44 (thin profile plastic quad flat package) as used on the previous post.