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ADS1115 - required timing after changing mux and pga settings

Thomas Weber
Intellectual 680 points
Other Parts Discussed in Thread: ADS1115

What are the required times after changing the mux and the pga.

When will the next result in single conversion mode be available.

I want to convert 2 channels every 8 ms (125 Hz)

The i2c speed is 400 kHz.

In the data sheet I found nothing about delays after changing the configuration.

My sequence is:

ads1115: configure mux AIN0-AIN1, pga 2.048 V

ads1115: start conversion

ads1115: read result

ads1115: configure mux AIN2-AIN3, pga 4.096 V

ads1115: start conversion

ads1115: read result

process the data

wait for next round

  • 0
    TI__Guru** 113765 points

    Hi Thomas,

    The actual startup time in single shot mode is not very long with respect to the data rate (approximately 20us).  You will probably find that the internal oscillator will vary enough that the actual data rate can be with +/-10% of the selected data rate and this is probably a bigger factor to consider.

    You could set the data rate to 475 or 860 sps to shorten the acquistion and still have some extra time for startup and communication.

    Best regards,

    Bob B