I am wanting to change some of the configuration parameters contained in registers in the Allegro Microsystems ACS71020. I am using an I2C version of the IC. Here is the datasheet: https://www.allegromicro.com/-/media/Files/Datasheets/ACS71020-Datasheet.ashx . In particular, I would like to set a specific I2C address for the chip and disable the default analog voltage input selection approach to choosing the I2C address so I can use those pins for other purposes. The datasheet suggests that I should be able to permanently make such a change by updating register 0x0F/0x1F.
I am able to read data from registers but I have been unable to write to any register including register 0x0F. The wire.endTransmission() call terminates successfully but on reading back the register, nothing has changed. I am clearly missing something. There are ECC codes for these registers. Is that something I have to set?
I can post a sample program if someone has the patience to look at it.
Update: Problem solved. See comments to Umar's answer below.
Thanks for the help.