# Adafruit High Voltage UPDI Friend - USB Serial UPDI Programmer

**Type:** Product page · **SKU:** ADA5893 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/adafruit-high-voltage-updi-friend-usb-serial-updi-programmer.html ([markdown](https://core-electronics.com.au/adafruit-high-voltage-updi-friend-usb-serial-updi-programmer.html.md))

UPDI stands for Unified Program and Debug Interface, but this board is so smol and cute that we will call it the Unusually Playful Device Interfacer and...

## Pricing

- **Price:** $18.95 (inc GST) — $17.23 AUD, exc GST
- **Quantity discounts:** 10+ $16.71 (exc GST) · 50+ $16.36 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## Description

**UPDI** stands for Unified Program and Debug Interface, but this board is so smol and cute that we will call it the **Unusually Playful Device Interfacer** and pat its head when it does a good job. It's designed to make programming modern ATtiny chips very easy because it has 3V or 5V power and logic select, power, and transmit indicator LEDs, and a quick cable for poking into a breadboard.

Unlike [Adafruit's simple UPDI version](https://core-electronics.com.au/adafruit-updi-friend-usb-serial-updi-programmer.html), this board is **HV** for **High Voltage** because it will let you send a quick 12V pulse to the UPDI right before programming. This is required for when the chip is configured to use the UPDI pin as a reset or GPIO. This board will also let you 'unbrick' any chip configured for HV usage, you can use it to reset the fuses for Low Voltage programming.

As for Adafruit's seesaw boards, Adafruit have been working a lot with [ATtiny816](https://core-electronics.com.au/adafruit-attiny816-breakout-with-seesaw-stemma-qt-qwiic.html), [ATtiny817](https://core-electronics.com.au/adafruit-attiny817-breakout-with-seesaw-stemma-qt-qwiic.html), and [ATtiny1616](https://core-electronics.com.au/adafruit-attiny1616-breakout-with-seesaw-stemma-qt-qwiic.html) chips lately. And Adafruit are often needing to program them with a [CP2102-based breakout](https://core-electronics.com.au/adafruit-cp2102n-friend-usb-to-serial-converter.html) with a [1K resistor soldered between the RX and TX pins](https://learn.adafruit.com/adafruit-attiny817-seesaw/advanced-reprogramming-with-updi). But Adafruit were hankering for a nicer programmer!

This UPDI High Voltage Friend makes programming such chips very easy:

- **Select between 3V or 5V power and logic** - the 3V regulator can source up to 500mA to run even big projects.
- **Internal 12V boost converter** with analog switch that will send a pulse to the UPDI line when the RTS pin is toggled low.
- **CH340E USB Serial** converter chip with cross-platform drivers
- **1K Loop-back Resistor** between RX and TX
- **USB Type C** for data and power connection to any computer
- **JST SH cable** included for quick plugging into a breadboard - you can get another [JST SH 3-pin cable with sockets](https://core-electronics.com.au/jst-sh-1mm-pitch-3-pin-to-socket-headers-cable-100mm-long.html) or with [pin header](https://core-electronics.com.au/jst-sh-compatible-1mm-pitch-3-pin-to-premium-male-headers-cable-100mm-long.html) here.
- **0.1" spaced breakout holes** for custom connections.
- **Green power OK LED**
- **Red serial activity LED**
- Inspired by this [open-source hardware design](https://github.com/wagiminator/AVR-Programmer/tree/master/SerialUPDI_HV_Programmer) from [Stefan Wagner](https://github.com/wagiminator)!
 
Adafruit use Arduino IDE with the megaTinyCore board support package installed; simply select "Serial UPDI" as the programmer type. Adafruit use 230Kbps, but 56Kbps is also good. In order to enable the high-voltage fuses settings, you'll need to edit boards.txt to remove the # comment tag on the “UPDI/RESET PIN CONFIGURATION” lines.

The Adafruit UPDI Friend is compatible with the full range of modern AVR microcontrollers that use the [Unified Program and Debug Interface (UPDI)](https://www.google.com/search?q=Unified+Program+and+Debug+Interface)

## Technical Details

Product Dimensions: 29.0mm x 17.7mm x 4.9mm / 1.1" x 0.7" x 0.2"

Product Weight: 2.5g / 0.1oz

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/A/D/ADA5893-1.jpg)