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Tiny Atmega644 Board

Created by
heathkit
Created on Dec 25, 2008
Featured on Dec 26, 2008

Here's a board I designed back in 2006. At the time, I was obsessed with making easy to use controller modules in the smallest packages possible. This control board should fit into a DIP44 socket.

Includes a nice LDO 5V regulator I found, and an onboard RS232 line converter. The line voltage RS232 pins and the power and ground pins are on a screw terminal header, and just about everything is brought out to the pins on the bottom. I tried to get as much IO as possible, but obviously there are some pins that didn't make it. Includes ISP header, and also has the watch crystal for RTC.

It's a pretty neat board, and it can be assembled by hand for about $20.

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Tiny Atmega644 Board by heathkit is licensed under the Attribution - Share Alike - Creative Commons license.

© 2008 by heathkit

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Here's the parts list, with Digikey part numbers:

296-9593-1-ND - IC DRVR/RCVR RS-232 1-CH 16-SSOP
576-1276 - IC REG LDO 500MA 5.0V LN SOT223
ATMEGA644-20AU-ND - IC AVR MCU FLASH 64K 44TQFP
PX200BCT-ND - RESONATR CERM W/CAP 20.00MHZ SMD
300-8341-1-ND - CRYSTAL 32.768 KHZ 6PF SMD
516-1436-1 - LED 469NM BLUE DIFF 1206
516-1444-1 - LED 520NM GREEN DIFF 1206
277-1275 - CONN TERM BLOCK 2.54MM 4POS
311-10.0KFCT-ND - RES 10.0K OHM 1/4W 1% 1206 SMD
311-470ECT-ND - RES 470 OHM 1/4W 5% 1206 SMD
PCC1901CT-ND - CAP .47UF 25V CERAMIC Y5V 1206
490-1775-1-ND - CAP CER .1UF 50V 10% X7R 1206

Tiny Atmega644 Board

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