diff --git a/components/pca9554.rst b/components/pca9554.rst
index fbeb69b14..0acc4db6a 100644
--- a/components/pca9554.rst
+++ b/components/pca9554.rst
@@ -6,16 +6,21 @@ PCA9554 I/O Expander
     :image: ../images/pca9554a.jpg
 
 
-The PCA9554 component allows you to use **PCA9554**, **PCA9554A** or **PCA9536** I/O expanders in ESPHome. 
-It uses :ref:`I²C Bus <i2c>` for communication.
+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 **8** pins (PCA9554, PCA9554A) or **4** pins (PCA9536) as
-pins for your projects. Within ESPHome they emulate a real internal GPIO pin
+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.
 
@@ -23,19 +28,21 @@ binary sensor or GPIO switch.
 
     The 7 bit I²C device address ranges are:
 
-    - PCA9554: ``0x20`` to ``0x27``
+    - PCA9554 and PCA9535: ``0x20`` to ``0x27``
     - PCA9554A: ``0x38`` to ``0x3F``
     - PCA9536: ``0x41``
 
-    For the PCA9554 and PCA9554A, the actual choice of the I²C device address depends on state of the 3 address pins.
+    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 PCA9554 and an additional eight PCA9554A devices can reside on the same I²C bus. 
+    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 PCA9554 and PCA9554A provide 8 bits of GPIO's (pin numbers 0-7).
+    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 GPIO's (pin numbers 0-3).
+    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.
@@ -67,6 +74,12 @@ 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.
 
 
 
@@ -88,6 +101,7 @@ See Also
 - :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`