Updifier

Updi-Key

What is it?

Updi-Key is an inline adapter that transforms your favorite UPDI programmer into a HV UPDI programmer. Now you can easily enable UPDI mode, program and power-cycle your target MCU to explore additional features like using the UPDI pin for LUT0, AIN0, GPIO or Reset.

Why did you make it?

To provide a tool that allows easy access to the additional functions of the programming pin, which becomes more important in low pin count applications. To enhance your existing programming solution with a convenient low cost adapter.

What makes it special?

Unique, versatile, easy to use with the existing programming environment you're already familiar with.

• Converts any UPDI programmer to HV-UPDI
• Connects directly in-line with the MPLAB Snap In-Circuit Debugger (pins 2, 3, 4)
• Connects directly in-line with many ATtiny 0/1/2 development and breakout boards
• Provides standard 6-pin UPDI headers with pin 3 used for additional functions
• The 3-pin UPDI headers can be any combination of male/female or vertical/horizontal at each end
• Automatically provides target power-cycle with current limiting protection
• Directly compatible with any target voltage from 3V to 5V without reprogramming the device
• Host UPDI is inherently protected by using "break-before-make" signal transfer
• No power hungry resistor-diode host UPDI protection circuit required
• Built-in low noise, low EMI, low power 3-5VDC to 12VDC converter (25mA)
• Fast HV pulse timing similar to the Atmel Power Debugger
• Continuously monitors host UPDI signal and Re-Updify button on one pin for detecting stable or busy status of the UPDI signal and pushbutton status
• Green VTG-PC status LED and Orange HV pulse LED
• It seems fitting that the smallest MCU in the family (ATtiny202) operates the key

Updi-Key Digi-Key BOM

Schematic

Firmware Installation

1. Connect a UPDI programmer to J3 (Pin2 VTG to VCC, Pin3 PROG to UPDI, Pin6 to GND)

2. Install the latest version of megaTinyCore

3. Install the Updi-Key Firmware

   ● Click on the green "Clone or download" button, then select "Download ZIP".

   ● Unzip this file in a folder on your PC.

   ● In the Arduino IDE, open the sketch "UpdiKey.ino" in the "source\updikey" folder

   ● Use these board settings:

   

   ● Select "Burn Bootloader" then "Upload Using Programmer" from the Arduino IDE. Updi-Key is now ready to use.

Functional Description

High Voltage Programming Options

UPDI Host Pin Description

UPDI Target Pin Description

Green VTG LED:

This LED is connected to VTG-PC so it will be both power on indication and power-cycle indication.

Orange HV LED:

On power-up or just after the Re-Updify button is released, the orange HV LED will be on during the HV pulse and enable sequence.

Target Power:

VTG-PC: This pin is the output of the MIC2091 power switch that is optimized for 100mA over-current limiting and circuit protection.

VTG: This pin connects directly to your external power source.

Re-Updify:

This button is used just prior to re-programming when using "Auto Power Cycle and High Voltage Pulse" mode.