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ADS131A04: Configuration question

Ryker She
Intellectual 2720 points
Part Number: ADS131A04

Tool/software:

Hi expert,

My customer is evaluating ADS131A04 currently and there are 2 questions as below, please help to confirm. Thanks a lot.

  • Customer want to configure the ADS131A04 as a host and DSP as a slave. Therefore, if the DSP only can configure the ADS131A04 initialization when ADS131A04 (as a host) sending data to DSP?
  • If the CS pin would pull down when the ADS131A04 is configured as asynchronous slave mode? And DSP can't pull CS pin up when the ADS131A04 is in asynchronous slave mode?

Best Regards,

Ryker

  • 0
    TI__Mastermind 47451 points

    Hi Ryker She,

    Can you please respond to my question in the Notes section of the Thread Tracking Toolkit?

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Intellectual 2720 points

    Hi Bryan,

    I have replied your question in the notes. Please help to confirm my above question. Thanks.

    Besides, for the second question of CS pin, R&D found the CS pin would pull down when the ADS131A04 is configured as asynchronous slave mode and DSP can't pull CS pin up. As below waveform shows, the CS signal would pull down after it keep high level voltage about 0.48us. Is it normal and how to fix it if it is abnormal.

    BR,

    Ryker

  • 0 in reply to Ryker She
    TI__Mastermind 47451 points

    Hi Ryker She,

    In Asynchronous Interrupt Mode, CS is an input from the host (controller) to the ADC. In other words, the ADC does not control CS.

    In this mode, you use DRDY as an interrupt to the controller to know when new data is ready to be read from the ADC

    To use synchronous master mode, where the ADC is the master, connect the ADC to the controller using the diagram below. Note that CS is connected to the /DONE signal on the ADC, and that DRDY is connected to the CS on the host SPI peripheral. The ADC sends SCLKs as discussed in the datasheet, I highlighted the correct section below

    -Bryan