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ADS7828: ADC sampling value reading method

Jimmy Lai
Expert 6845 points
Part Number: ADS7828

Dear Team,

We have information on the method of reading the specified register to obtain the voltage value through i2c. Can you explain in detail what register we read to obtain the current voltage value, or what driver do we use to obtain the current voltage value?

Many Thanks,

Jimmy

  • 0
    TI__Mastermind 22950 points

    Hi Jimmy,

    Data can only be read after a conversion has been initiated. Page 12 of the data sheet describes this in more detail. 

    Regards,

    Aaron Estrada

  • 0 in reply to Aaron Estrada
    TI__Expert 6845 points

    Hi Aaron,

    We appreciated your great support!

    1. Is there any software tool that has been made to read the voltage data directly under the OS?

    2. I saw the following instructions from an ads7828 file, but after I mounted the lm75 and lm-sensors drivers and executed sensors-detect, I could only see the i2c address of ads7828, but did not identify the chip type, and then executed sensors to read the sensor Data, there is no information from ads7828, what steps did I do wrong?

    Many Thanks,

    Jimmy

  • 0 in reply to Jimmy Lai
    TI__Mastermind 22950 points

    Hi Jimmy, 

    Linux support is very limited at the time and this driver was written by a 3rd party. Unfortunately, I am not a Linux expert as well. However, if you able to probe the SDA and SCL lines with an oscilloscope? Seeing what commands are being sent when you expect a read to be performed would be very helpful to ensure the proper commands are actually sent. 

    Regards,
    Aaron