Power Pins:

  • Vin - this is the power pin. The ATtiny8x7 operates between 1.8V and 5.5V. However, we still included a 3.3V voltage regulator. You can power from 3.3V to 5V. It defaults to Vin voltage, which can be between 3.3V and 5V, or cut the jumper on the back and bridge the other pad to select 3.3V logic.
  • 3Vo - This is the 3.3V output from the voltage regulator. You can grab up to 100mA from this if you like.
  • GND - This is common ground for power and logic.
If you swap the jumper on the back to select 3.3V logic, the ATtiny should be kept at the (pre-programmed default) 10MHz and not set faster

I2C Pins / STEMMA QT:

  • SCL - This is the I2C clock pin. Connect to your microcontrollers I2C clock line. There is a 10K pullup on this pin to Vin.
  • SDA - This is the I2C data pin. Connect to your microcontrollers I2C data line. There is a 10K pullup on this pin to Vin.
  • STEMMA QT - These I2C connectors, located on each end of the board, have 10K pullup resistors. They allow you to connect to development boards with STEMMA QT connectors, or to other things, with various associated accessories.

seesaw GPIO Pins:

  • 0, 1, 2, 3, 20, 5, 6, 7, 8, 9, 12, 13, 14, 18, 19 - These are the 15 GPIO pins available.
Pins 15, 16 and 17 can NOT be used as GPIO pins with the seesaw firmware!

seesaw Interrupt Pins:

  • 15 - This pin can be set to pull low by the breakout to signal to your host microcontroller that an interrupt has occurred.

seesaw I2C Address Pins:

  • 16 / AD0 - This is the ADDR0 pin. Connect this to ground to increment the device's I2C address by 1.
  • 17 / AD1 - this is the ADDR1 pin. Connect this to ground to increment the device's I2C address by 2.

seesaw NeoPixel-Capable Pins:

  • 0, 1, 2, 3, 20, 5, 6, 7, 8, 9, 12, 13, 14, 18, 19 - Any GPIO pin can be a NeoPixel pin, however, you can only use one pin at a time. There is only one NeoPixel buffer, and therefore only one NeoPixel output. It can drive up to 60 pixels.

ADC Pins:

  • 0, 1, 2, 3, 6, 7, 18, 19, 20 - There are nine 10-bit ADC pins.

PWM Pins:

  • 0, 1, 9, 12, 13 - There are five 8-bit PWM output pins.

Programming Pins:

  • UPDI - This is the single-pin Unified Program and Debug Interface. This pin is for external programming or on-chip-debugging. It uses the reset pin on the ATtiny.
There is no reset on this breakout! It is used for the UPDI programming pin, and cannot be used to reset the board!

This guide was first published on Oct 20, 2021. It was last updated on 2021-10-20 12:04:17 -0400.

This page (Pinouts) was last updated on Nov 20, 2021.

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