Update pcf8574.rst (#2608)

* Update pcf8574.rst * Update components/pcf8574.rst Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com> Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
2023-01-21 20:50:58 +01:00 · 2023-01-21 20:50:58 +01:00 · dd5bc51973
parent 06925fe585
commit dd5bc51973
1 changed files with 3 additions and 0 deletions
--- a/components/pcf8574.rst
+++ b/components/pcf8574.rst
@ -55,6 +55,9 @@ Configuration variables:
  Defaults to ``0x21``.
 - **pcf8575** (*Optional*, boolean): Whether this is a 16-pin PCF8575. Defaults to ``false``.

+.. note::
+
+    If you use PCF8575, pin numbers are from 0 to 15, not 0 to 7 and 10 to 17 as datasheet states!

 Pin configuration variables:
 ****************************