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AFE11612-SEP: Alarm Pin Function

Dhir Gandhi
Prodigy 190 points
Part Number: AFE11612-SEP

Tool/software:

Hello,
I would like to better understand the internal circuitry related to the Alarm Pin function in the ADC. The datasheet does not provide a complete block diagram showing the signal path up to the Alarm Pin when an ADC channel goes out of range. Could you please provide more details on this functionality?

In particular, I am interested in:

  1. How the threshold voltage reference is established in hardware.

  2. The accuracy of this reference once it is set.

  3. Would this provide similar accuracy and reliability as an external comparator circuit?
  • 0
    TI__Genius 10310 points

    Hi Dhir,

    I've asked the design team your questions. I'll let you know their responses.

    Thanks,
    Erin

  • 0 in reply to Erin Bowrie
    TI__Genius 10310 points

    Hi Dhir,

    The comparison is done against the two codes - the threshold code you put in the register vs the ADC code. The accuracy in this case is solely based on the ADC measurements, and that accuracy you can find in the electrical characteristics. 

    Thanks,
    Erin

  • 0 in reply to Erin Bowrie
    Prodigy 190 points

    Hello Erin,

    Thanks for the clarification.

    From what I understood, in the threshold register, I am setting the ADC reading in raw bits, and they are directly compared with the adc measurement register values, please correct me if I am wrong.

    Also, I plan to use the ADC in manual trigger mode. Could you please let me know if the ALARM pin will work even if I don't trigger the ADC to read the channels.

    Lastly, I want to understand how is the ALARM pin operated after the register bit. Is it directly OR ed with other 4 channels and given to the Alarm pin, or is there any other circuitery in between.