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FXOS8700 changes between production and preproduction

Question asked by Michael Andersen on Feb 27, 2017

In my circuit, for some reason or another, the FXOS8700 will change address from 0x1e to 0x4e and the WHOAMI register will change from 0xc7 to 0xc4. It then stays like that until the entire system is power cycled.


Please can someone tell me why the chip is doing this? 


In my circuit, reserved pins 3 and 13 are grounded as per the datasheet. N/C pin 15 is not connected. I presume this is some internal functionality that end customers are not supposed to see (some kind of debug mode or whatever). What triggers it?