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minor update readme.md

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Rob Tillaart 2024-01-06 15:24:53 +01:00
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libraries/PCF8575/README.md
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@ -25,6 +25,7 @@ Base address = 0x20 + 0..7 depending on address pins A0..A2.
| type | address-range | notes |
|:-----------|:--------------:|:-------------------------:|
| PCF8575 | 0x20 to 0x27 | same range as PCF8574 ! |
| PCF8575C | 0x20 to 0x27 | need pull up in input mode. See #36, to be verified.
So you can connect up to 8 PCF8575 on one I2C bus, giving access