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PCF8885 Touch Sensor addressing

Question asked by Paul Buckman on Apr 15, 2019
Latest reply on Apr 16, 2019 by Tomas Vaverka


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.