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[tca9555] Add interrupt_pin documentation #6430

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Merged
jesserockz merged 1 commit into from
Apr 10, 2026
+7 −1
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[tca9555] Add interrupt_pin documentation #6430

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8 changes: 7 additions & 1 deletion src/content/docs/components/tca9555.mdx
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Expand Up @@ -20,7 +20,8 @@ not work.
```yaml
# Example configuration entry
tca9555:
- id: 'TCA9555_hub'
- id: 'tca9555_hub'
interrupt_pin: GPIOXX

# Individual outputs
switch:
Expand All @@ -37,6 +38,11 @@ switch:
- **id** (**Required**, [ID](/guides/configuration-types#id)): The id to use for this TCA9555 component.
- **address** (*Optional*, int): The I²C address of the driver.
Defaults to `0x21`.
- **interrupt_pin** (*Optional*, [Pin Schema](/guides/configuration-types#pin-schema)): The pin connected to the
INT output of the TCA9555. When configured, the component becomes interrupt-driven instead of
polling — it only reads the chip when a pin actually changes state, significantly reducing I²C bus traffic
and CPU usage. The INT pin is active-low and open-drain, so an external or internal pull-up resistor is
required. Must be an internal GPIO pin (not another expander pin).

## Pin configuration variables

Expand Down