Adafruit ISO1540 Bidirectional I2C Isolator
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.
Pinout
- VCC
Power pin for each side of the isolator. Adafruit states each isolated side must be powered separately.
Type · powerVoltage · 3 to 5 VDC on both isolated sides, source: Adafruit Learn pinouts - GND
Ground reference for each side of the isolator. Connect the reference ground on either side.
Type · ground - SCL
I2C clock line on either isolated side. Adafruit notes a 10K pullup to that side's VCC.
Type · signalVoltage · Pulled up to that side's VCC, source: Adafruit Learn pinouts - SDA
I2C data line on either isolated side. Adafruit notes a 10K pullup to that side's VCC.
Type · signalVoltage · Pulled up to that side's VCC, source: Adafruit Learn pinouts - STEMMA QT
STEMMA QT / Qwiic connectors on either side for I2C dev boards and accessories.
Start wiring
I2C · SPI · 3 to 5 VDC on both isolated sides, source: Adafruit Learn pinouts · Pulled up to that side's VCC, source: Adafruit Learn pinouts
Confirm the data interface matches your host board.
Module pins: VCC, GND, SCL, SDA. Schematik maps them to your board in the app.
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