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Original question:

ADS131A02: SPI Driver example code

ADS131A02: Reset sequence : how to read/get "READY" status response

Takumi Suzuki1
Mastermind 8610 points
Part Number: ADS131A02
Other Parts Discussed in Thread: ADS131A04

Hi,

Let me ask you a basic question about "Reset" sequence.

As you know, after issuing RESET command, we need to  wait "READY" status (FFxx).

I do not undrstand well about how to get/know "READY" status.

Do I need to issue "NULL" command to get "READY" information? (DOUT port read, Fig 69 : datasheet page 50)

If yes and if the ADC is not ready, what data will be output to DOUT port? (Of course, in case ADC is ready, the data is "FFxx"".)

Sorry for my basic question and thank you in advance for your support.

Best Regards,

  • 0
    TI__Guru* 97875 points

    Takumi-san,

    I believe that once the device completes reset, the response should be the READY response from the first command. I think that a NULL command would get the same response READY response after the first 4.5ms. Before this period, the response of the device would be undetermined.

    The READY response should come out with the next command clocked into the device. For example, I had seen this result from a previous test from the ADS131A04. this is the READY response caught with the UNLOCK command, when the previous command was RESET:

    You can see that the FF0400 comes out with the 24 bits clocked in for the 065500 UNLOCK command.

    Joseph Wu

  • 0 in reply to Joseph Wu
    Mastermind 8610 points

    Hi Joseph-san,

    Thank you so much for your reply!

    I understood.

    Best Regards,