ISO1540-based galvanic isolation breakout for I2C buses, providing bidirectional SDA/SCL isolation between controller and device sides. Used to separate earth-grounded, high-voltage, or noisy power domains from a microcontroller I2C bus.
Power pin for each side of the isolator. Adafruit states each isolated side must be powered separately.
Ground reference for each side of the isolator. Connect the reference ground on either side.
I2C clock line on either isolated side. Adafruit notes a 10K pullup to that side's VCC.
I2C data line on either isolated side. Adafruit notes a 10K pullup to that side's VCC.
STEMMA QT / Qwiic connectors on either side for I2C dev boards and accessories.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | Power pin for each side of the isolator. Adafruit states each isolated side must be powered separately. | 3 to 5 VDC on both isolated sides, source: Adafruit Learn pinouts |
| GND | Ground | Ground reference for each side of the isolator. Connect the reference ground on either side. | |
| SCL | I2C | I2C clock line on either isolated side. Adafruit notes a 10K pullup to that side's VCC. | Pulled up to that side's VCC, source: Adafruit Learn pinouts |
| SDA | I2C | I2C data line on either isolated side. Adafruit notes a 10K pullup to that side's VCC. | Pulled up to that side's VCC, source: Adafruit Learn pinouts |
| STEMMA QT | Unknown | STEMMA QT / Qwiic connectors on either side for I2C dev boards and accessories. | Carries side-specific VCC/GND plus SDA/SCL; exact cable side follows board connector, source: Adafruit Learn pinouts |
Power pin for each side of the isolator. Adafruit states each isolated side must be powered separately.
Ground reference for each side of the isolator. Connect the reference ground on either side.
I2C clock line on either isolated side. Adafruit notes a 10K pullup to that side's VCC.
I2C data line on either isolated side. Adafruit notes a 10K pullup to that side's VCC.
STEMMA QT / Qwiic connectors on either side for I2C dev boards and accessories.
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