I am using PCF8885 touch sensors and I am curious about the addressing structure. Ao is fine I understand that. However when I look at the PCF8885 and pull back the I2C address it tells me that it is 0x21 and indeed when I look at Application Sheet UM10505 and look at the circuit diagram (page 10 of 17) I see two PCF8885's. Also looking at the downloaded code for that example project I see that one is addressed at 0x21 while the other (Slider) is addressed at 0x42?
How is this address change made. Is it through the config command? If a SoftReset is sent does it revert to its original address? Or do these addresses need to be set before the device is deployed into the circuit.