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ADS1296: START pin on ADS1296 sampling chip

Jonathan M
Prodigy 10 points
Part Number: ADS1296
Other Parts Discussed in Thread: ADS1299

Hello,

My team is planning on starting the ADS1296 chip using the start command.

If the start command is successful, will the pin labeled as "START" on the ADS go high?

Our START pin is currently floating and we're not starting it through the pin.

Thanks,

Jonathan

  • 0
    TI__Mastermind 19815 points

    Hi,

    The START opcode/command and START pin may not 100% associate, so 

    "When using the START opcode to begin conversions, hold the START pin low."

    AND

    "Tie the START pin low to control conversions by command."

    "When the START opcode is sent to the device, keep the START pin low until the STOP command is issued."

    ------------------------------------

    datasheet doesn't suggest floating START pin.

    Thanks

  • 0 in reply to ChienChun Yang
    Prodigy 10 points

    Here is the design we are using. This is from OpenBCI called Cyton, it uses the ADS1299. Due to supply issues we could only get our hands on the ADS1296. We have the whole board assembled and everything is working except for communication between the ADS and our micro-controller. We are trying to figure out why the ADS1296 is not currently operational. We have verified the wiring is consistent with the diagram shown. Any advice as to how to get the ADS operational or determining the problem would be greatly appreciated.

  • 0 in reply to Jonathan M
    TI__Mastermind 19815 points

    Hi,

    First of all, how is the START pin or START command issue discussed earlier?

    ----------------------------------------------------

    What do you mean by "We have the whole board assembled and everything is work except for communication between the ADS and our micro-controller. "

    And, as you mentioned " it uses the ADS1299. " and "we could only get our hands on the ADS1296."

    FYI,  ADS1299 and ADS1296 are not 100% compatible device so whatever works for ADS1299 may not work for ADS1299, that could include communication.

    ----------------------------------------------------------

    May I ask which firmware code do you use?  What was that firmware developed for?  E.g. Was that firmware code developed for ADS1299 or ADS1296?

    Thanks