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PCB files for the Adafruit ATtiny816 and ATtiny1616 Breakouts with seesaw - STEMMA QT / Qwiic.
Format is EagleCAD schematic and board layout
These breakout boards are a "three in one" product:
We primarily designed this board for our own use: it's a mini dev board that lets us design with the ATtiny816 just like we did for the ATSAMD09. With the 2021-2022 silicon shortage, we're adapting some of our SAMD09 designs to the ATTiny8xx series and wanted a quick minimal board to test code on.
Each breakout comes with the assembled and tested board, as well as some header strips. Each PCB is fairly minimal and contains:
The ATtiny816 and ATtiny1616 are identical in specifications except for storage space:
The ATtiny816 has 8KB flash, 512 bytes of RAM, 128 bytes of EEPROM
The ATtiny1616 has 16KB flash, 2KB of RAM, 256 bytes of EEPROM
Internal oscillator can run up to 20MHz
Internal hardware multiplier
Can run from 2V to 5V power/logic (check the datasheet for max speed at desired power)
3.3V regulator - by default we run at the Vin voltage, which can be 5V, but there's a solder jumper on the bottom if you'd like to select 3V logic.
Green power LED
Red indicator LED
Two STEMMA QT I2C connectors with 10K pullup resistors, connected to pins 8 and 9
These boards comes pre-programmed with seesaw peripheral code that will let it act as an "I2C to something" converter, basically a little I2C-controlled friend to do all the timing-sensitive things many microcontrollers and microcomputers are not good at.
For example, using these breakouts with the pre-burned seesaw firmware gives you
Of course, you can configure or reprogram the chip to however you want to use it - we like using SpenceKonde's megaTinyCore which brings Arduino peripheral support to this series of chips. To program the chip you will need a 'UPDI' programmer, which you can make with a USB-to-Serial cable and a single 4.7K or 10K resistor.
Please note: The boards do not come with a bootloader. If you want to do development on seesaw (e.g. changing the configuration) you need a separate UPDI programming setup! The firmware we put on is available as this example sketch, compiled using the megaTinyCore. We don't provide any support for custom builds of seesaw - we think this is cool and useful for the Maker community!
For more details including the documentation on how to use seesaw, libraries for Arduino/CircuitPython/Raspberry Pi Python, schematics, and more check out the Adafruit seesaw guide
Adafruit invests time and resources providing this open source design, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Designed by Limor Fried/Ladyada for Adafruit Industries.
Creative Commons Attribution/Share-Alike, all text above must be included in any redistribution. See license.txt for additional details.
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