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ADS131A04: ADS131A04 Master Mode

HR AHMD
Prodigy 145 points
Part Number: ADS131A04


Hi, 

I will use the ADS131A04 on synchronous master mode. Previously i worked on it with the Asynchronous Interrupt Mode, so on every interrupiton of DRDY, the MCU send a null cmd to recieve a sample for every channel. 

So in master mode is there no need to send null commands to  the ADS131A04 for recieving data, or we have to send null commands for channels to recieve samples even in master mode. 

Best Regards. 

  • 0
    TI__Guru* 98195 points

    Hi,

    Thanks for the comment. I think it is more common to use the asynchronous interrupt mode to control the device and get data from the ADC. However, you can use synchronous master mode as you describe to get data from the device. Generally, I see synchronous master mode used in a daisy chain system of several ADS131A04 devices.

    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 145 points

    Joseph, 

    Thanks for your reply, but you have'nt give me a clear anwser to my question : 

    In master mode, should we send null commands to receive channel samples each time, or will ADS13aA04 send samples continuously and we are not supposed to send commands to receive samples?

    Thanks.

    Best regards. 

  • 0 in reply to HR AHMD
    TI__Guru* 98195 points

    Hi,



    I'm sorry, I thought your post was just a comment. I didn't see your question.

    In synchronous slave mode, you wouldn't send a command to retrieve the data. After the device is configured, it acts as the SPI master. When the conversion completes, the device uses the /DRDY as the /CS to the microcontroller which is acting as the slave. Then the device also send out the DOUT and SCLKs so that the microcontroller receives the data. You can see this in figure 63 of the datasheet.



    This way, you don't send null commands to receive the data.


    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 145 points

    Thanks Joseph, that's anwered clearly my question. 

    Best Regards.