Go Down

Topic: Single-sided Arduino-Leonardo board (Read 5130 times) previous topic - next topic

CrossRoads

Not getting what you think is the problem frank.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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!
   


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.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Go Up