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AMC7836EVM: Question about AMC7836EVM alarm operation

Jade Goo
Intellectual 1940 points
Part Number: AMC7836EVM

Hi Team,

I have a question about AMC7836EVM alarm operation.

I followed below sequece for alarm operation.

(1) High Limit set to 1V

(2) Write Settings

(3) Insert 2V to ADC16

(4) Read Alarms

I could see below tripped message.

However, when I repeat "Read Alarm" again, "No Alarm" message.

It looks like auto clear after read alarm and required time delay for next tripped message.

Please confirm my understanding is correct.

Also how can reduce delay between tripped message?

Thank you.

Best Regards,

Jade

  • 0
    TI__Genius 11750 points
    Howdy Jade,

    You are correct, reading the status registers clears the alarm status bits. The alarm bit can only be cleared by reading it's Alarm Status register after the event is resolved, or by hardware reset, software reset, or power-on reset. Additionally, all "alarm status bits are cleared when reading the Alarm Status registers, and all these bits are reasserted if the out-of-limit condition still exists after the next conversion cycle". Most of this information can be found on page 61 of the datasheet.

    When the "Read Alarm" button is pressed, the GUI reads the previously described register, which clears the alarm bit.

    Most of the delay comes from the GUI, as it uses Labview to write/read from the PC to the SDM-USB-DIG. The SDM-USB-DIG includes a microcontroller that is responsible for direct SPI communication with the AMC7836EVM. For faster response, you can directly connect a microcontroller to the AMC7836EVM device without a PC interface.

    Hope this information helps,

    Best Regards,
    Matt