investigate compatibility PCA954X family

[RobTillaart]

A derived tree of multiplexers.

• update library.properties + json
• update keywords.
• new base class?
• should PCA be an repo of its own?

[RobTillaart]

TCA9548 is a SWITCH, 8 channel, can select multiple channels

Not compatible => own library

• PCA9540 is a MUX, has an enable bit and uses binary coded channel selection.
• PCA9541 is a MUX, but a multi master, single slave. completely different
• PCA9542 is a MUX, has an enable bit and uses binary coded channel selection.
• PCA9544 is a MUX, has an enable bit and uses binary coded channel selection.
• PCA9547 is a MUX, has an enable bit and uses binary coded channel selection.
• PCA9549 is an 8 channel ON/OFF device, completely different

Compatible - with interrupt bits that need attention.

• PCA9543 is a SWITCH, 2 channel, compatible but has interrupt bits in mask.
• PCA9545 is a SWITCH, 4 channel, compatible but has interrupt bits in mask.

Compatible

• PCA9546 is a SWITCH, 4 channel code compatible
• PCA9548 is a SWITCH, 8 channel code compatible

So with some effort the PCA9543/45 can be supported too. Need to fin a way to handle the interrupts.

[RobTillaart]

Solved in 0.2.1

• supports now PCA9543/45/46/48 including interrupts.
• created new library for - https://github.com/RobTillaart/PCA9549