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ADS1015-Q1: Question of ADC conversion at one-singleshot command

Lee, Sam
Expert 4965 points
Part Number: ADS1015-Q1
Other Parts Discussed in Thread: ADS7950, ADS7142-Q1

Hi team,

A customer reviews ADS1015-Q1 for two single ended key inputs, but the ADC conversion time between these two inputs should be short, not to lose the input by the sequential conversion time when the keys are pressed at the same time.


So, does ADS1015-Q1 support two converstions sequentially at a time with one-singleshot command?

Otherwise, does it need each command per each key input? In that case, ADS1015-Q1 is not available for this application. Can you recommend an appropriate ADC?

Thanks,

Sam Lee

  • 0
    TI__Guru* 92655 points

    Sam,


    The ADS1015-Q1 does not operate in this way. You need to send a single-shot command and configuration for each conversion data you want. This would be four I2C bytes for each transaction: I2C address, configuration register pointer, and two bytes for the configuration.

    If you need something that can be programmed to read through a set of inputs, you might want to look at the ADS7950. However, it uses SPI instead of I2C. I don't normally support this device, so you may want to read through it carefully to see if it operates the way you want it to.


    Joseph Wu

  • 0 in reply to Joseph Wu
    TI__Expert 4965 points

    Joseph,

    Thank you for your advice. For ADS7950, they need a ADC device which has roughend leadframe. It doesn't seem that ADS7950 supports it.

    Can you review one more if ADS7142-Q1 will be okay for the application (two analog inputs (3.3V), single-ended)?

    Thanks,

    Sam Lee 

  • 0 in reply to Lee, Sam
    TI__Guru* 92655 points

    Sam,

    Based on what I know, it looks like the ADS7142-Q1 can read the data in a sequence. However, I don't know this device very well either. I'll point this post to my colleague, Cynthia to see if she has any other input to this. In the mean time, can you give some more information about this application? What data rate is the customer looking for? What are they measuring? What input voltages are they expecting?

    Joseph Wu