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# PCA9536D i2c I/O expander
Requires a configured i2c bus
Example:
```yaml
pca9536d:
- id: my_pca
switch:
- platform: gpio
pin:
pca9536d: my_pca
number: 0
id: relay
binary_sensor:
- platform: gpio
pin:
pca9536d: my_pca
number: 1
id: button
```
# Optional parameters
`address:` defaults to 0x41