Assembled ATtiny3216, the new tinyAVR 1-series, 32k flash 2k ram, 17 I/O pins, DAC, Arduino supportDesigned by Azduino by Spence Konde in United States of America
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Convenient, minimalist development/breakout board for new ATtiny3216 (or 1606 while supplies last) Over the past several years, Microchip has been releasing parts with a new - and greatly enhanced ...Read More…
Over the past several years, Microchip has been releasing parts with a new - and greatly enhanced - set of peripheral. These use the familiar AVR instruction set and open source avr-gcc compiler used with the classic AVR microcontrollers, but with redesigned and more capable on-chip peripherals and highly competitive prices. The best known of these (among hobbyists, at least) is the ATmega4809, used on the Arduino Uno WiFi Rev.2 and Nano Every. However, there is also an the tinyAVR 0-series and 1-series microcontrollers featuring these new types of peripherals - and now with my megaTinyCore, there is full Arduino IDE support for these. megaTinyCore has been advancing rapidly, as we optimize flash usage, built-in functions, and the built-in libraries well beyond what was done for the original core for the ATmega4809 as used in the official Arduino boards mentioned above.
These breakout boards come equipped with your choice of 3.3v or 5v regulator (ZLDO1117 or LDL1117 depending on stock) so that it can be supplied with an external supply (minimum 1.3v higher than operating voltage) using the two pins in the lower left corner, an LED (on PA7, Arduino pin 3), and a UPDI programming header (with a resistor on the board). There is a 1x6 pin "FTDI"-style serial header on the bottom edge of the board. This board is available with or without autoreset support (the ones with autoreset support also have the breakaway mounting tabs). Pictures 1 and 3 show boards with autoreset support, pictures 2 and 4 show boards without autoreset support. Even on boards with autoreset support, it is only available when Optiboot is installed, which disables UPDI programming - as the same pin must be configured for either UPDI or Reset functionality - once this is loaded, the solder bridge on the back of the board must be closed. This process can be optionally done for you prior to shipping.
New Optiboot bootloader allows programming with just an external serial adapter (like an Arduino Pro Mini), making these parts easier to use than ever before!
All pins are broken out, and there are 3 Vcc and 3 Gnd pins available, plus the ones on the UPDI and Serial headers so even if you're not using breadboard, you can still easily connect power and ground for multiple external devices.
Board dimensions are 1.7" x 0.85"
The ATtiny1606 is the top-end 0-series part in the 20-pin package. The 0-series is intended for low cost applications, and cuts a few features. These have not sold well and will not be restocked.
In some of the pictures shown above, the boards are shown with pin header (not included) mounted on them. We recommend:
There are two approaches to programming these parts:
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. There is a resistor on the breakout board; you do not need to add another one. As of 4/30/2020, all 3216 boards with AutoReset support have a 470 ohm resistor. All older boards have 4.7k - this was determined to be unnecessary, and had only possible downsides compared to 470. Note that if a direct connection to the UPDI pin is needed, the pin on the edge of the board marked UPDI/RST is connected directly - only the one in the 3-pin header has the series resistor.
A typical development configuration might have the board connected to a serial port via the 6-pin serial header for serial debug, and to the UPDI programmer via the 3-pin header for uploading new code (as shown in the pictures)
As of megaTinyCore 1.1.2, the Optiboot bootloader is supported for all parts; this works with an external serial adapter (like the 6-pin ones used for the Arduino Pro Mini). Optiboot takes up 512b of flash for the bootloader. In addition to obliviating the need for a UPDI programmer to upload sketches, Optiboot allows you to use the same port for upload and serial monitor like a normal Arduino board. On the ATtiny412 and ATtiny402 parts, due to the limited memory, we do not recommend using Optiboot.
There are two general approaches to using Optiboot on these parts:
Without auto-reset, UPDI enabled. On all boards that do not support auto-reset, and on boards that do if this option is selected, the UPDI/Reset pin will be left as UPDI, and the board can be freely reprogrammed via UPDI. The version of the bootloader installed will be active for 8 seconds after power on, or after a WDT or software reset. So for example, to upload, you would verify sketch, unplug, plug back in, and then upload - or alternatively, you could adapt your sketch to trigger a software reset. UPDI programming will still be possible. Note that for these boards, you must use UPDI to "burn bootloader" with the non-optiboot board definition selected if you want to switch back to uploading sketches via UPDI
With auto-reset, no UPDI. On boards which do support auto-reset (if using optiboot), you may elect to order the board with or without that enabled. If it is, the bootloader will not run on power on; it will only run after a "hardware reset" - it will not run after a normal power on reset. Only after external (reset pin) or software reset; this mimics the behavior of a classic bootloader on (for example) an ATmega328p, and coupled with autoreset provides a very smooth user experience. Warning: This comes with a very large downside: if this option is chosen, you cannot reprogram the board via UPDI unless you use an "HV UPDI" programmer. The RST_EN solder bridge must also be disconnected prior to this.
A third approach is to upload sketches which all have a means of triggering a "software reset" from within the sketch, either from a pin interrupt (the existing autoreset parts could be wired to this pin). With other trigger mechanisms, this could be used in more advanced deployments, such as a device at the far end of a serial line, which resets in response to a specific command0). These schemes allow one to use the bootloader without powercycling the board while also permitting use of UPDI programming - however because they depend on the sketch, they are inherently more "brittle", and that UPDI programming option may become necessary to revive boards during development -in the event of bugs in the application. This method is beyond the scope of this product listing.
If purchased without the bootloader installed, if you later decide that you want it, you may install it using a UPDI by doing burn bootloader (if using autoreset and UPDI pin set as reset, the jumper on the back must be closed after bootloading); this pre-bootloading service is intended only as a convenience.
Boards with optiboot preinstalled are bootloaded at the time the order is received. All boards are set to 20-MHz derived clock speeds unless 16 MHz is requested, 4.2 sampled BOD, 3.3v boards are set to 10MHz (will also run at 5MHz) 2.6v sampled BOD. No-regulator boards are set to 20MHz/10MHz/5MHz, with BOD disabled to minimize idle power consumption. Because these are bootloaded on-demand, and since UPDI programming is disabled on autoreset boards, if you have different requirements (eg, 16MHz base clock to allow 16MHz/8MHz/4MHz speeds, or different BOD settings), this can be done, just list what you want in order comments.
More information on Optiboot and the tinyAVR 0/1-series parts is available in the megaTinyCore documentation.
The linear regulators offered can provide a regulated operating voltage provided Vin in at least 1.3v (ZLDO1117) higher than the operating voltage. These regulators are appropriate when your current requirements are relatively low, and you have access to a power supply with a voltage higher than the operating voltage (max 18v input) - maximum power dissipation, however, is only ~1.2W without adding heatsinks, (that is to say (Vin - Vout)*(current) < 1.2W) so the practical maximum current is much lower.
Example calculations of maximum current when using the regulator:
Vin=12v, Vout=5v. Vin-Vout=7V. 7V*I < 1.2W -> I < 1.2W/7V -> I < 170mA
Vin=7v, Vout=5v. Vin-Vout=2V. 2V*I < 1.2W -> I < 1.2W/2V -> I < 600mA
Only the Vin pin goes through the regulator - all other Vcc pins (including the UPDI and FTI headers) are connected directly to the Vcc rail - so if you have a 3.3v regulator, but connect a 5v serial adapter's 5v line to the board, the board will be running at 5v (this will not harm the board itself, as long as the voltage does not exceed 5.5v - but if you have 3.3V devices connected to it, those may be harmed, so if you have any of those connected, you must use a 3.3v serial adapter or power some other way, and not connect the 5v pin of the serial adapter (the data lines are fine, as serial adapters almost universally have a 1k~2.2k resistor in series with the TX and RX lines which will limit the current to a non-dangerous level, or disconnect the 3.3v devices from the board before connecting the 5v to the board's Vcc), whereas if you supply 5v to the Vin pin, the board will be running at 3.3v.
However - a regulator has a quiescent current that it draws to power itself (0.25mA~0.5mA for these regulators). Hence, if you are running on batteries and using power saving techniques, you want to avoid having a regulator on the board if possible. For example, if running off a LiPo/LiIon battery at 3.7~4.2v, you could set it to run at 10MHz, and use no regulator - approximate power use with a regulator (whether or not you power through the regulator or connect power direct to Vcc), the sleep mode power down current will be ~0.25mA (almost all from the regulator), whereas without the regulator, current in sleep mode power down will be ~0.1uA (0.0001mA) at room temperature - that is, for a project where the chip will spend most of it's time in sleep mode power down, the battery life may be 2,500 times longer without the regulator.
If powering from batteries w/out a regulator, you need to be careful not to connect external power directly to Vcc (including from a serial adapter or UPDI programmer) while the battery is connected.
On boards where there is no regulator, the PTC fuse is still present (in series with Vin), and the regulator is bypassed by a 0-ohm resistor, so you can still use the Vin pin power the board to get the benefit of overcurrent protection. See picture 3 for an example of what the "no regulator" looks like.
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