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AWRL1432: What does its GPADC do?

GC H
Prodigy 10 points
Part Number: AWRL1432

Tool/software:

HELLO

As for the description of GPADC1 and GPADC2 in the datasheet, it is mentioned in the datasheet that these are two analog to digital converters that can be customized by users, but it is also mentioned that these are special ADCs set for the temperature sensor inside the 1432. May I ask whether these two ADCs can be used as ADCs in ordinary MCU? Detect the voltage in the circuit.

If you can, please answer this question from both software and hardware perspectives.

Thanks

  • 0
    TI__Genius 12986 points

    Hello,

    Thanks for reaching out on E2E regarding the AWRL1432's GPADCs. The GPADCs are used primarily for RF monitoring, but they can be controlled by TI firmware running inside the FEC subsystem and can be accessed for external voltage monitoring purposes via MMWave APIs routed to the FEC subsystem. These MMWave APIs - specifically MMWave_enableGPADC and MMWave_readGPADC - make calls down into the DFP layer to configure and measure signals. The DFP allows configuring the settling time (number of ADC samples to skip) and number of consecutive samples to take. 

    The GPADCs input can be accessed via a BGA pins M6 (GPADC1) and L6 (GPADC2). This can be found under Section 6.1 Pin Diagrams of the datasheet.

    You can find a software implementation for reading the GPADCs by looking for the dpc.c for the mmWave demo or Motion and Presence Detection demo and searching for the "MMWave_readGPADC" function. The dpc.c file can be found under <MMWAVE_LSDK_INSTALL_DIR>/examples/mmw_demo/mmwave_demo/source/dpc and <MMWAVE_LSDK_INSTALL_DIR>/examples/mmw_demo/motion_and_presence_detection/source/dpc.

    Let me know if you have any other questions.

    Regards,

    Kristien

  • 0 in reply to Kristien Everett
    Prodigy 10 points

    HELLO

    I have learned that GPADC can be used to monitor external voltage. We must use this 1432 to ensure the stable operation of the antenna. Is GPADC always serving the antenna during the operation of the antenna? If the GPADC is already used in the antenna operation, can both ADCs be used to monitor the external voltage? If so, will the use of the two in parallel affect the sampling of both or one of them?

    Or can we use GPADC to monitor the external voltage only when the antenna is out of action?

    Thank you for your answer.

  • 0 in reply to GC H
    TI__Genius 12986 points

    Hello,

    Let me check with some other engineers who might have more details on this. Please give me two days.

    Regards,

    Kristien

  • 0 in reply to Kristien Everett
    Prodigy 10 points

    Hello,

    Is there an answer to my question? Maybe you are very busy, I just want to confirm that my problem is still being dealt with. This project will be reported to the client soon, so I hope you can spare time to reply,

    Regards.

  • 0 in reply to GC H
    TI__Genius 12986 points

    Hello,

    Yes, another engineer should reply within the next day or two.

    Thank you for your patience,

    Kristien