Derive PCF8574 16-pins from TCA9534, add atomic package options
This derives the PCF8574 IO expander from the pin-compatible TCA9534:
- https://www.ti.com/lit/ds/symlink/tca9534.pdf
- http://www.nxp.com/docs/en/data-sheet/PCF8574_PCF8574A.pdf
| TCA9534 | PCF8534 |
|---|---|
 |
 |
Also split up into the various options:
- -P DIP, addr 0b0100
- -AP DIP, addr 0b0111
- -T SOIC, addr 0b0100
- -AT SOIC, addr 0b0111
Edited by John Beard