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ADS1282-SP: Pulse SYNC mode / SPI

Steve Widener
Genius 10145 points
Part Number: ADS1282-SP
Other Parts Discussed in Thread: ADS1282

       I had some questions about the ADS1282-SP.

  1. There was a pin called sync. I saw that there are 2 modes of operation, pulse sync mode and continuous sync mode. If we use pulse sync mode, is this signal used to start conversion?
  2. I didn’t see any pins for a chip select in the SPI port. If we operate in pulse sync mode, can this be used as something similar to chip select? We are looking to share the DIN, DOUT and SCLK with other devices and wanted to ensure that the ADS1282-SP would be able to share too otherwise we would need a separate SPI port for it.
  • +1
    TI__Mastermind 40860 points

    Hi Steve,

    1.  Yes, the SYNC pin in pulse sync mode can be used to start a conversion.

    2.  Unfortunately no, the SPI port is always active.  DOUT is always driven high or low (even in standby), and any SCLK activity will clock data on the DIN pin.  These parts basically require a dedicated interface to the processor.  SCLK, SYNC, DIN, /RESET can be shared with multiple ADS1282 devices, but each device requires a separate DOUT connection, and SCLK should only be active when reading/writing data to the ADS1282.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    TI__Genius 10145 points

    Do we have to use the sync pin to start conversion, or will it continuously output data and we just need to read the DRDY pin to know when its ready for reading?

  • +1 in reply to Steve Widener
    TI__Mastermind 40860 points

    Hi Steve,

    No you do not.  On power-up default, the device is in Read Data Continuous mode and you only need to monitor the /DRDY line for data readback.  However, if not using the SYNC pin, then you should connect it HIGH, so that you can use the SYNC command to resynchronize the ADC.

    Regards,
    Keith