Breakout/development board for ATtiny3216 and other 20-pin megaAVR ATtiny, Arduino compatibleDesigned by Azduino by Spence Konde in United States of America
Assembled board shown for reference only - this is the listing for the BARE BOARD Assembled boards with ATtiny3216 or ATtiny1606 are available my other listing This is a breakout board for the new ...Read More…
Assembled board shown for reference only - this is the listing for the BARE BOARD
This is a breakout board for the new ATtiny megaAVR x6 series - supports 3216, 1616, 816, 416, 1606, 806 - all the 20-pin megaAVR 1-series and 0-series ATtiny parts. These are highly capable and affordable ATtiny parts - prices are lower than most classic AVR ATtinys with the powerful megaAVR peripherals. These parts are fully compatible with Arduino using my megaTinyCore, too.
The new Rev. B boards featuring improved pin solder-bridge jumpers are now available. See the Documentation link for more detailed information on these new features and the full specs on these boards.
U1 ATtiny 3216, 1616, 816, 416, 1606 or 806
C1 1206 0.1uF Cap - decoupling
C2 1206 Output Cap for regulator and power supply filtering (4.7uF or as directed by regulator datasheet)
C3 (If using regulator) 1206 Input Cap for regulator (4.7uF or as directed by regulator datasheet)
C4 1206 0.1uF capacitor if using autoreset. With Rev. - or if not using autoreset, Do Not Use
R1 1206 470 ohm resistor - Series resistor for UPDI pin,
R2 1206 10k resistor if using autoreset. With Rev. - or if not using autoreset, Do Not Use
D1 SOD123 diode with band facing the regulator if using autoreset. If not using autoreset, Do Not Use
LED1 (optional) 1206 LED, this is connected to PA7 (Arduino pin 3)
R3 1206 resistor (ballast for LED - 2.2k ~ 220 ohm depending on how bright you like your LEDs - I use 1k)
U2 (optional) 1117-series or compatible voltage regulator in SOT-223 package (Recommended: LDL1117). If you plan to run directly off a battery (ex, a protected LiPo battery), but still want the PTC fuse protecting the power from battery, a 2512 0-ohm resistor can be soldered between the pads for the regulator tab and pin furthest from the fuse to jumper around the regulator; this will connect the fuse (and hence Vin header) directly to Vcc.
F1 (if using regulator, or jumpering across regulator as described above) 1206 PTC fuse (1A max recommended, can replace with jumper if you like to live dangerously or your power supply is already current limited)
Pin Header - 1x3 for UPDI header, 1x6 for FTDI serial header. 2 1x15 headers for the I/O pins - recommend normal square header for use with DuPont jumpers, or machined pin header for use with breadboard. All 0.1" pitch.
Power header (if using regulator) Your preferred 2-pin power connector, wires to in-line connector as appropriate for your application, 0.1" pitch.
Unlike other AVR microcontrollers, these new parts are programmed via a "UPDI" singlewire interface instead of the SPI-based ICSP protocol. You can easily use a standard Arduino Nano, Uno, or Pro Mini as a UPDI programmer, this is what we use and recommend - see the instructions here:
The order of the pins on the UPDI header is UPDI-Gnd-Vcc - this means that if the programmer is connected backwards, the board will not be damaged. The 4.7k resistor is on the breakout board; you do not need to (and should not) use another one.
megaTinyCore now supports the Optiboot bootloader for serial uploads (though you still need a UPDI programmer to bootload the board - our assembled boards are now available with optiboot preinstalled) - if you wish to use this with autoreset, you must bootload the board with an Optiboot board definition selected, with the UPDI pin configured as reset (note that this makes further UPDI programming impossible without an HV programmer), and then solder the two small contacts on the bottom of the board in order to enable autoreset (which would have blocked UPDI programming to bootload were it connected at that time). After that, it can be programmed with just a serial adapter (same 1x6-pin header as used on the Arduino Pro Mini and others).
More information on Optiboot and the megaavr ATTiny parts is available in the megaTinyCore documentation.
On Rev. - boards (no longer available), the reference designators are missing from the top silkscreen. Refer to images as reference; part locations are:
U1, U2 - obvious
2 1206 parts on either side of UPDI header - R3, LED1
2 1206 parts between UPDI header and U1 - (starting from UPDI header) R1, C1
2 1206 parts between regulator and Vin header (starting from edge of board) - F1, C2
1 1206 part on other side of regulator - C3
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