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ADS1114: ADS1114

Abid Hussain
Prodigy 10 points
Part Number: ADS1114


I am using ADS1114 in my project and I am facing a problem. When I write the value 0x8a03 to the config register and when I read it back the value is not same. Check the log printout below. 


00> 0:3:19 writing value, 0x8a03 to register 0x01. 

00> 0:3:19 config register, read value is 0xa03

And here is the I2C analyzer printout.

 

Why the write and read value is not same?

  • +1
    TI__Guru** 113765 points

    Hi Abid Hussain,

    Welcome to the E2E forum!  You are actually getting back what you should expect. Bit 15 (most significant bit) is the operation status (OS) bit.  When you write a '1' to this bit when the ADS1114 is in single-shot conversion mode, a conversion will begin.  When reading this bit the conversion status will be indicated with a '0' indicating that a conversion is in process and a '1' indicating the device is not currently performing a conversion.

    I did notice that the first set of sequences appeared correctly with the proper I2C START and STOP signaling being issued.  But later on there was a series of transmission that did not include the proper START, repeated START or STOP conditions.  Make sure that you follow the I2C protocol for communication properly.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 10 points

    Hi Bob Benjamin, 

    Thanks for the response. 

    Bob Benjamin said:
    When reading this bit the conversion status will be indicated with a '0' indicating that a conversion is in process and a '1' indicating the device is not currently performing a conversion.

    Got it, I did not notice this in the datasheet earlier. I went through the datasheet again and found this point. 

    Bob Benjamin said:
    I did notice that the first set of sequences appeared correctly with the proper I2C START and STOP signaling being issued.  But later on there was a series of transmission that did not include the proper START, repeated START or STOP conditions. 

    Can you please point it out, where exactly it is happening.

    Thanks again.

  • 0 in reply to Abid Hussain
    TI__Guru** 113765 points

    Hi Abid Hussain,

    After a second look I misinterpreted the data previously.  It does look ok to me now.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 10 points

    Hi Bob Benjamin,

    Thanks, I got my results.