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LP87745-Q1: Change REG_OV_CONF Register (Offset = 29h) from default value to custom value

Swapnil
Intellectual 550 points
Part Number: LP87745-Q1
Other Parts Discussed in Thread: IWR6843,

Hello Community,

I am using LP87745-Q1 with IWR6843 on custom board. I could read and write into this PMIC register. I could change voltage values by unlocking registers first by writing 0x9B into REGISTER_LOCK Register (0xA).

I am trying to change the default configuration of REG_OV_CONF Register from 0xEE to other custom value, but after SPI transfer I get CPU reset error. 

I am transferring below data:

txBufSPI[0] = 0x29;
txBufSPI[1] = 0x0;
txBufSPI[2] = 0x0;

Not sure why CPU reset is coming after SPI transfer.

"C674X_0: Power Failure on Target CPU"

Thanks and Regards,

Neil

  • +1
    TI__Expert 4985 points

    Hi Neil,

    The device has configuration CRC enabled and therefore any changes done to the registers will cause an CRC error. For initial debugging it is OK to mask CONFIG_CRC_MASK interrupt but for the final application the CRC value should be recalculated.

    Refer to the datasheet section 8.12.2 CRC Protection for Configuration Registers for recalculating the CRC.

    BR,

    Samuli