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AFE031: Standalone usage of AFE031

Caglar Cihan
Expert 6235 points
Part Number: AFE031
Other Parts Discussed in Thread: OPA564

Dear Team,

 

My customer has been using AFE031 on their PLC designs. They have now a new project on which they need to inject a sinusoidal waveform only to detect line faults. They do not want to use a companion MCU for this task. Is it possible to use AFE031 standalone by only writing “1” to PA-OUT register through SPI connection?

 

Best Regards,

 

Caglar

  • 0
    TI__Expert 5830 points
    Hello Caglar,

    It is possible to use the PA on board the AFE031 as standalone. The REF1 block that is used for biasing the PA to mid-supply will need to be enabled as well as the PA to output the signal. Bare in mind that the PA is in an internal fixed inverting gain 6.5 V/V.

    Best regards,

    Errol Leon
    Texas Instruments
    Precision Amplifier Applications
  • 0 in reply to Errol Leon6
    TI__Expert 6235 points

    Hi Errol,

     

    Based on your comments, I understood that PA needs to be set to “1” in Enable1 register at 0x01 address.

    My customer does not want to use any MCU at all in this board, so they will not be able to set this bit through SPI.

    Is there anyway to use AFE031 in fully standalone mode, just injecting a sinusoadial waveform into the line?

     

    I have one more question regarding the receiving end of this application.

    They would like to understand if there is a mis-soldering on the SPI pins of AFE031. How does host MCU handle the situation if it cannot connect through SPI, or if there is a problem in SPI communication?

    If there is a problem in communication, does the code keep pinging or does it goes into error mode after first trial?

     

    Best Regards,

     

    Caglar

  • 0 in reply to Caglar Cihan
    TI__Expert 5830 points

    Hello Caglar,

    The only way to configure the AFE031 to be usable is with an MCU.  If you cannot write to the registers,  you will not be able to use the AFE031 because all the sub-blocks inside the AFE031 are disabled which is the default values of the "Enable 1 Register".  If a stand alone PA is what you are looking for I would recommend OPA564 which is similar specs to the PA in the AFE031. 

    I am not sure I understand what is meant by a "mis-soldering of the SPI pins of AFE031".  Could you elaborate a little more on this issue?

    Best regards,

    Errol

     

  • 0 in reply to Errol Leon6
    TI__Expert 6235 points

    Hi Errol,

    Let me rephrase it; how the stack handles the situation if there is a missing connection on SPI lines to AFE031? Does it keep trying connect, or go into latch mode?

    Best Regards,

    Caglar

  • 0 in reply to Caglar Cihan
    TI__Expert 5830 points

    Hello Caglar,

    Sorry for the late reply,  I was on international business travel and sick leave.  The answer to the AFE031 SPI question is that it will keep trying to connect.

    Best,

    Errol