Hello, To use address 1001 001 please make sure that pin1, ADDR, of the second device is connected to VDD. The first device, seems to be correctly have pin1 connected to GND. Please make sure this is correct Page 31 on the datasheet demonstartes a quickstart guide as to how to communicate with the device and write to the deseried registers. note that the first 7-bit sent from the master to the slave is the device address, follwed by the 8 being a read/write indicator. (high/low respectively) Regards, Cynthia
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