Datasheet Change Due To Issue Discovered In MCP23017 Chip

[woolseyj]

I found out today that Microchip discovered an issue in their MCP23017 chip where under certain circumstances the I2C SDA signal may become corrupted when the chip’s GPA7 and/or GPB7 pins are used as inputs. For this reason, they updated the datasheet to reflect that those pins should only be used as outputs.

I'm hopeful that a silicon revision is in the works, but I wanted to alert the library maintainer in case they were unaware of the issue.

[blemasle]

Hi,

Sorry this notification slipped out of my mind. I was not aware of that issue, thanks.
I'll update the readme to include a warning regarding those pins.

Thanks again.