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ADS1220: inhibit conversion during initial configuration

O'Mellin
Expert 6005 points
Part Number: ADS1220

Team,

Customer of mine is triggering unwanted single shot conversion during initial ADS1220 configuration. As per the pseudo code it looks like it's possible to not waste the time in reading those unwanted conversion result.

How do you suggest reset time is minimized by inihibiting or avoiding conversion triggers when writing to configuration registers?

thanks

  • 0
    TI__Guru** 113765 points

    Hi O'Mellin,

    The ADS1220 will restart a conversion on a register configuration change and that is just the way the part works so that the conversion result will always reflect the most current configuration.  As you mentioned you do not need to read the conversion result and it can be ignored.  If the customer wants to start a conversion at a different time, then the START/SYNC command can be issued that will start or restart the conversion (if the conversion is in process).

    So you cannot avoid triggering the conversion when writing the register, but you can ignore the result, or START/SYNC a new conversion while the triggered conversion is taking place. 

    I'm not totally clear about what you are asking regarding 'how do you suggest reset time is minimized'.  Does this refer to power-up reset time?  Or a change of configuration?  As I have just stated, following change of configuration the conversion result is restarted.  It can be used, ignored, or a conversion can be restarted using the START/SYNC command.

    On ADS1220 power up, the ADS1220 will take one conversion and go to a low power state.  You do not have to wait for the initial conversion to complete before writing the configuration or sending a command.  Even though the pseudo code shows issuing the RESET command, you are not required to do so.  What should be followed is the power-supply ramp rate shown in section 10.2 on page 73 of the datasheet.  In 10.1 it states to 'wait approximately 50us after all supplies are stabilized before communicating with the device to allow the power-up reset process to complete.'

    Best regards,

    Bob B