NEW GUIDE: Adafruit ISO1540 Bidirectional I2C Isolator #AdafruitLearningSystem #Adafruit @adafruit
I2C bus controller on one side, I2C bus device on the other: you gotta keep em separated!
Sometimes you’ll find yourself with an I2C bus controller on one side, and an I2C bus device on the other and you gotta keep em (electrically) separated. Maybe because one is Earth-grounded, maybe because you’ve got some funky power monitoring setup, maybe you want to reduce noise.
Whatever it is, you can use the Adafruit ISO1540 Bidirectional I2C Isolator to add full electrical isolation between two sides of an I2C bus. The chip we use, the TI ISO1540 is fully bi-directional, supports up to 1 MHz clock rates, supports clock-stretching, works with 3 to 5V DC power or logic (separate on either side of course), with 2500 V-RMS isolation.
The Adafruit ISO1540 Bidirectional I2C Isolator guide covers everything you need to get started using your ISO1540. There’s an overview, a pinouts page and download resources for you to learn more about the chip and the breakout. If you picked up one of these excellent little breakouts, this guide is a great place to start!
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