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ADS131A02: What is the value of the device ID n the READY response?

David Crocker
Prodigy 20 points
Part Number: ADS131A02
Other Parts Discussed in Thread: ADS131A04

Tool/software:

I am implementing a driver for the ADS131SA02. I need to check whether the device is present and ready. The datasheet says I should send a NULL command and expect a response in the next transaction of 0xFFdd where dd is the hardware device ID, However, the datasheet does not specify the value of the hardware device ID. What value should I check for? Checking just that the most significant byte is 0xFF is insufficient, because in this design the SPI MISO line is pulled high when the device is not present on the SPI bus.

  • 0
    TI__Mastermind 40705 points

    Hi David,

    Welcome to the TI E2E community.

    Please see the highlighted description from the datasheet. For ADS131A02, the 'DD' is 02h. For ADS131A04, the 'DD' is 04h. 

    BR,

    Dale

  • 0 in reply to Dale Li
    Prodigy 20 points

    Thanks,that answers my question. The datasheet is confusing by referring to this byte as the "hardware device ID" in table 14 but failing to define or mention that term elsewhere in the datasheet. Now I see that in section 9.5.3.6.1 it refers to this byte as the channel count instead.