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Why did not well operates local and two remote temperature sensors of AMC7812?

Seung Joon Lee
Prodigy 80 points
Other Parts Discussed in Thread: AMC7812

Hi,

I tested AMC7812 with PIC32, but the local and two remote temperature sensor have odd operation.

When the AMC7812 is in external reference mode, these temperature sensors work well.

But ADC-n-data-register has reference voltage value, when ADC channel are open. 

And in internal reference mode, local temperature data register have 255.875, D1 and D2 temperature data register has value of -50 ~ -70 range.

Besides, ADC value is fluctuated by unknown issues.

Does anybody have same problem?

Best Regards,

Seung Joon Lee

  • 0
    TI__Genius 11750 points

    Howdy Seung,

    For the ADC channels, I have provided an explanation in another post:

    http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/315801/1098791.aspx#1098791

    Regarding the temperature data with the internal reference, can you verify the following:

    • ADC-REF-INT Register  is set to '1' to enable the internal ADC reference buffer
    • Compensation capacitor of 4.7uF or greater connected from ADC-REF-IN to GND.
    • A 100pF to 10nF capacitor is also recommended between the reference output and GND for noise filtering.

    It may just be that the internal ADC reference buffer is not set.

    Best Regards,

    Matt

  • 0 in reply to Matthew Sauceda
    Prodigy 80 points

    Howdy Mattew,

    Thank you for reply.

    As adding capacitor for noise filtering, I can solve the problem.

    Best Regards,

    Seung joon Lee