ATtiny861 version discontinued due to low demands and the fact that the 861 can be had in DIP package.

There is NEW VERSION (yes, a revision to a classic AVR board in 2023) coming soon. Actually, TWO, new versions, one like this only better, and the other using the QFN that can fit into a DIP-24N socket - and will do VUSB like a digispark pro, with the standard (not digispark's) pin numbers (because digispark's are poorly chosen)

Simple ATtiny167 breakout board

This is a simple development board for the Atmel/Microchip ATtiny167. It provides an ISP header for programming via ISP as well as decoupling capacitors, a voltage regulator, and a PTC fuse protecting the external power supply from a short. The ATtiny167 is supplied with Optiboot preloaded, allowing it to be programmed over serial (like an Arduino Pro Mini). It can be used as a standalone board with female dupont jumpers or header, and the pins pointing up, or with breadboard, by mounting the pins pointing down. For ease of connection w/out breadboard, four Vcc and Gnd pins are provided, instead of just one. If installing into breadboard, round/machined pin header is recommended, as the normal style of pin header is too large and deforms breadboard contacts, causing unreliable connections in the future.

Using the ATTinyCore Universal core available from my Github at https://github.com/SpenceKonde/ATTinyCore, ATtiny167 (and all other tinyAVRs with at least 4k of flash or a larger-flash version with 4k+ flash) can be used with the Arduino IDE. The ATtiny167 can be programmed over serial (like an Arduino Pro Mini) using optiboot, and both can be programmed with any ISP programmer (USBAsp recommended).

This board is sold ASSEMBLED, but without pins (as shown - color-coded pin sets will be available for the Rev. B version of the board.)

ATtiny 167 features

The ATtiny167 is an automotive entry in the classic ATTiny product line, with its headline feature being hardware support for LIN 2.1/1.3, and the accompanying current source for LIN node identification. LIN is a broadcast serial network protocol designed for automotive applications, and has been in widespread use since the early 2000's. The same peripheral can, with most of it's features turned off, function as a very powerful serial interface - it's ability to accurately generate baud rates was unmatched among classic AVR, being more akin to what the modern AVRs have on all UARTs. This part is uniquely notable for being the only classic tinyAVR to receive any sort of product changes other than EoL after the Microchip buyout: A new, much, much better QFN package was introduced around 2020. Sounds like it was very popular with influential customers, but the inexplicable choice of a 32-pin fine pitch package for a 20 pin part was understandably less popular, and apparently customer pressure was such that they actually lowered themselves to dusting off a classic AVR design and adding a package - a 4mm x 4mm 20 pin WQFN* package)

16k flash, 512b SRAM, 512b EEPROM 16 GPIO pins (15 excluding reset) Three PWM outputs LIN/UART with advanced baud rate generator Master/Slave SPI USI (allowing I2C or a second SPI bus using appropriate libraries) 11 single-ended ADC inputs 8 differential ADC pairs, with selectable gain of 8x or 20x On-chip Analog Comparator PCINT on every pin, plus INT0 and INT1 Operating frequency of 8 Mhz (internal), or up to 16MHz with external crystal. Assembled in the USA.

Note on pin mappings

There are three pin mappings in widespread use for these supported by ATTinyCore: Legacy, Digispark, and Standard. Standard is most efficient. Digispark is great if you're using a digispark board and hence want the numbers on it to mean something, but it is not an efficient pinout in terms of looking up things about pins. And the legacy is to make life easier on people stuck with code that used the old mapping, which was an inspired work of evil. The 2.0.0 version of the core will have a way to sidestep the stupidity of arduino numeric pin mappings, as that will be the first version that also has complete PIN_Pxn defines (eg, PIN_PA2). Even though the underlying mechanics are the same (a set of arduino pin numbers arbitrarily assigned to logical pins. By using PIN_Pxn constants, which are defined by all the pin mappings in ATTinyCore 2.0.0, you can write code that will work the same way regardless of the pin mapping selected.

• 4x4mm 0.5mm pitch WQFN20 - W = Very Very thin. The package names for QFN packages have nothing to do with the lead pitch - the same company sells parts in a 3mm x 3mm 0.4mm pitch VQFN20.