This Pololu USB-to-IC adapter functions as a bridge between IC devices and a PC or other USB host, enabling the USB host to serve as an IC controller and communicate with target devices on the IC bus. It supports bidirectional communication with clock stretching and IC clock speeds beyond 1000 kHz.

The adapter provides full galvanic isolation between the USB and IC sides, which prevents unexpected current flow between the USB host and the IC bus and protects the USB host from damaging voltages on the IC bus (the adapter would be damaged under such conditions, but those voltages would not be able to propagate through to the USB side).

The module features a USB-C connector. On the USB side, the adapter acts as a virtual serial port (CDC ACM), so it is recognised by major operating systems (e.g. Windows 10 and later, Linux, and macOS) without requiring any driver installation. This means the adapter can be used with any programming environment that allows writing and reading binary data from a serial port (see theusers guidefor documentation on the communication protocol).

We provide a Python library for the adapter to make it easy to get started in Python, and the firmware for the adapters STM32C071G8 microcontroller isopen sourcefor those who want to understand better how it works or customise the behaviour.

The IC side features a JST SH-style 4-pin connector that works with our4-pin JST SH-style cablesand is compatible with SparkFuns Qwiic and Adafruits STEMMA QT. It also brings the four IC pins out to 0.1-pitch through-holes that are compatible with standard 0.1male headersandfemale headers.

Note: This adapter does not deliver USB power to the IC side and instead requires target power to be supplied separately; an alternative adapter version is available that delivers isolated power to the target.

Connections

Specifications

• Size: 1.32 0.60 0.19
• Weight: 2.4g

Resources

• Pololu Isolated USB-to-IC Adapter Users Guide
• Pololu Isolated USB-to-IC Adapter repository
• Pololu Isolated USB-to-IC Adapter drivers for Windows (zip)
• Dimensions
• 3D Model
• Drill guide

Package Contents

• 1x Pololu Isolated USB-to-IC Adapter

USB-C and JST cables not included