The PCA9865 chip has an "All Call" address of 0x70. This is in addition to the configured address. Set the backpacks to address 0x71 or anything other than the default 0x70 to make the issue go away.
This guide was first published on Jun 26, 2016. It was last updated on Jun 26, 2016.
This page (FAQ) was last updated on Apr 22, 2021.
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