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LMH6881: SPI Command Field

Stephen Strong
Prodigy 90 points
Part Number: LMH6881

The datasheet says that there is a 8 bit SPI command field consisting of a read/write bit, 3 bits reserved, and a 4 bit address field, but it does not explain the command field.  For the read/write bit, is 0=read or is 0=write.  For the address field, it does not say if I should program the address bits to 0100 if i want to send to register 3, or should it be 0011.  There are only 4 total registers, so it could go either way on the address.

  • 0
    TI__Genius 16725 points
    Hi,

    I have confirmed that the address bits are in binary. So a register 3 should be at address 0011. I am reaching out to someone who worked on this part to find out about the read and write bits. I realized this datasheet is very ambiguous on a lot more in the programming section. I have queued the datasheet to be updated so that it can be more clear in the future.

    Thanks!
    -Karan
  • 0 in reply to Karan Kotadia
    TI__Genius 16725 points
    Hello,

    I have the confirmed answer.
    The 4 bit address field for register 3 should be interpreted as 0011, since this is in hexadecimal format. Also, the write bit is logic 0 and the read bit is logic 1.

    Thanks!
    -Karan