mirror of
https://github.com/esphome/esphome-docs.git
synced 2024-11-05 09:20:08 +01:00
108 lines
3.7 KiB
ReStructuredText
108 lines
3.7 KiB
ReStructuredText
PCA9554 I/O Expander
|
|
====================
|
|
|
|
.. seo::
|
|
:description: Instructions for setting up PCA9554, PCA9554A, PCA9536 digital port expanders in ESPHome.
|
|
:image: ../images/pca9554a.jpg
|
|
|
|
|
|
The PCA9554 component allows you to use a variety of Texas Instrument I/O expanders in ESPHome using the
|
|
:ref:`I²C Bus <i2c>` for communication.
|
|
|
|
Devices tested as working with this component include **PCA9554**, **PCA9554A**, **PCA9536** and **PCA9535**.
|
|
Equivalent TI I/O expanders with the same command interface and up to 16 I/O pins such as the **TCA9554**
|
|
and **TCA9535** should also work.
|
|
|
|
|
|
.. figure:: ../images/pca9554a.jpg
|
|
:align: center
|
|
|
|
PCA9554A I/O Expander chip
|
|
|
|
Once configured, you can use any of the **16** (PCA9535), **8** (PCA9554, PCA9554A) or **4** (PCA9536) pins
|
|
within your projects. Within ESPHome they emulate a real internal GPIO pin
|
|
and can therefore be used with many of ESPHome's components such as the GPIO
|
|
binary sensor or GPIO switch.
|
|
|
|
.. note::
|
|
|
|
The 7 bit I²C device address ranges are:
|
|
|
|
- PCA9554 and PCA9535: ``0x20`` to ``0x27``
|
|
- PCA9554A: ``0x38`` to ``0x3F``
|
|
- PCA9536: ``0x41``
|
|
|
|
For the PCA9535, PCA9554 and PCA9554A, the actual choice of the I²C device address depends on state of the 3 address pins.
|
|
Please refer to the individual datasheets linked at the bottom of the page for further details to set the address.
|
|
|
|
Up to eight PCA9535 or PCA9554 and an additional eight PCA9554A devices can reside on the same I²C bus.
|
|
Please note that only one PCA9536 device is allowed per I²C bus due to its fixed address.
|
|
|
|
The PCA9535 provides 16 bits of GPIOs (pin numbers 0-15).
|
|
|
|
The PCA9554 and PCA9554A provide 8 bits of GPIOs (pin numbers 0-7).
|
|
|
|
The PCA9536 provides 4 bits of GPIOs (pin numbers 0-3).
|
|
|
|
Any option accepting a :ref:`Pin Schema <config-pin_schema>` can theoretically be used, but some more
|
|
complicated components that do communication through this I/O expander will not work.
|
|
|
|
.. code-block:: yaml
|
|
|
|
# Example configuration entry
|
|
pca9554:
|
|
- id: 'pca9554a_device'
|
|
address: 0x38
|
|
|
|
# Individual outputs
|
|
switch:
|
|
- platform: gpio
|
|
name: "PCF9554A Pin #0"
|
|
pin:
|
|
pca9554: pcf9554a_device
|
|
# Use pin number 0
|
|
number: 0
|
|
# One of INPUT or OUTPUT
|
|
mode:
|
|
output: true
|
|
inverted: false
|
|
|
|
|
|
Configuration variables:
|
|
************************
|
|
|
|
- **id** (**Required**, :ref:`config-id`): The id to use for this ``pca9554`` component.
|
|
- **address** (*Optional*, int): The I²C address of the driver.
|
|
Defaults to ``0x20``.
|
|
- **pin_count** (*Optional*, int): The number of bits implemented in the expander. Defaults to 8. This should be set
|
|
to 16 when using a PCA9535 and 4 when using a PCA95367.
|
|
|
|
.. note::
|
|
|
|
A PCA9535 will not work (even on the lower 8 bits) unless the **pin_count** is set to 16.
|
|
|
|
|
|
|
|
Pin configuration variables:
|
|
****************************
|
|
|
|
- **pca9554** (**Required**, :ref:`config-id`): The id of the ``pca9554`` component of the pin.
|
|
- **number** (**Required**, int): The pin number.
|
|
- **inverted** (*Optional*, boolean): If all read and written values
|
|
should be treated as inverted. Defaults to ``false``.
|
|
- **mode** (*Optional*, string): A pin mode to set for the pin at. One of ``INPUT`` or ``OUTPUT``.
|
|
|
|
|
|
See Also
|
|
--------
|
|
|
|
- :ref:`i2c`
|
|
- :doc:`switch/gpio`
|
|
- :doc:`binary_sensor/gpio`
|
|
- `PCA9554 datasheet <https://www.ti.com/lit/ds/symlink/pca9554.pdf>`__
|
|
- `PCA9554A datasheet <https://www.ti.com/lit/ds/symlink/pca9554a.pdf>`__
|
|
- `PCA9535 datasheet <https://www.ti.com/lit/ds/symlink/pca9535.pdf>`__
|
|
- `PCA9536 datasheet <https://www.ti.com/lit/ds/symlink/pca9536.pdf>`__
|
|
- :apiref:`pca9554/pca9554.h`
|
|
- :ghedit:`Edit`
|