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84 lines
2.6 KiB
ReStructuredText
84 lines
2.6 KiB
ReStructuredText
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PCA9554 I/O Expander
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====================
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The PCA9554 component allows you to use PCA9554, PCA9554A or PCA9536 I/O expanders
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(`PCA9554 datasheet <https://www.ti.com/lit/ds/symlink/pca9554.pdf>`__,
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`PCA9554A datasheet <https://www.ti.com/lit/ds/symlink/pca9554a.pdf>`__,
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`PCA9536 datasheet <https://www.ti.com/lit/ds/symlink/pca9536.pdf>`__) in ESPHome.
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It uses :ref:`I²C Bus <i2c>` for communication.
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Once configured, you can use any of the 8 pins (PCA9554, PCA9554A) or 4 pins (PCA9536) as
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pins for your projects. Within ESPHome they emulate a real internal GPIO pin
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and can therefore be used with many of ESPHome's components such as the GPIO
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binary sensor or GPIO switch.
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The 7 bit I2C device address ranges are:
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PCA9554 : 0x20 to 0x27
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PCA9554A : 0x38 to 0x3F
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PCA9536 : 0x41
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For the PCA9554 and PCA9554A, the actual choice of the I2C device address depends on state of the 3 address pins.
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Please refer to the individual datasheets for further details.
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Up to eight PCA9554 and an additional eight PCA9554A devices can reside on the same I2C bus.
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Please note that only one PCA9536 device is allowed per I2C bus due to its fixed address.
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The PCA9554 and PCA9554A provide 8 bits of GPIO's (pin numbers 0-7)
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The PCA9536 provides 4 bits of GPIO's (pin numbers 0-3).
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Any option accepting a :ref:`Pin Schema <config-pin_schema>` can theoretically be used, but some more
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complicated components that do communication through this I/O expander will
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not work.
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.. code-block:: yaml
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# Example configuration entry
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pca9554:
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- id: 'pca9554a_device'
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address: 0x38
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# Individual outputs
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switch:
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- platform: gpio
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name: "PCF9554A Pin #0"
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pin:
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pca9554: pcf9554a_device
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# Use pin number 0
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number: 0
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# One of INPUT or OUTPUT
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mode:
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output: true
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inverted: false
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Configuration variables:
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************************
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- **id** (**Required**, :ref:`config-id`): The id to use for this PCF9554 component.
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- **address** (*Optional*, int): The I²C address of the driver.
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Defaults to ``0x20``.
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Pin configuration variables:
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****************************
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- **pca9554** (**Required**, :ref:`config-id`): The id of the PCA9554 component of the pin.
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- **number** (**Required**, int): The pin number.
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- **inverted** (*Optional*, boolean): If all read and written values
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should be treated as inverted. Defaults to ``false``.
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- **mode** (*Optional*, string): A pin mode to set for the pin at. One of ``INPUT`` or ``OUTPUT``.
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See Also
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--------
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- :ref:`i2c`
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- :doc:`switch/gpio`
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- :doc:`binary_sensor/gpio`
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- :apiref:`pca9554/pca9554.h`
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- :ghedit:`Edit`
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