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Original question:

AWR1243BOOST: Cascade AWR1243BOOST for radar imaging

AWR1243BOOST: Abnormal power supply for MSP430F5529LP and AWR1243

huangyaohui
Intellectual 520 points
Part Number: AWR1243BOOST
Other Parts Discussed in Thread: AWR1243

Hello ,TI team:

I'm working for  MSP430F5529LP connecting  AWR1243BOOST. I find that if I connect HOSTINT of AWR1243 with any pin of MSP430, when I power AWR1243 lonely, MSP430 also powered. When I power the MSP430, the AWR1243 also powered. In my test, the led is flashing when msp430 was powered .

And  I think the HOSTINT is the signal pin instead of the power pin. Please tell me why the question happenes. I also want to know whether the situation prevent the two modules from managing their own power.

  • 0
    TI__Mastermind 30355 points

    Hello,

    The HOST_INTR is pulled to GND on the EVM by a 10k pulldown resistor. It is only driven high by the AWR when the device is trying to get the attention of a SPI host.

    I do not think the HOST_INTR is powering the MSP430. Can you provide a block diagram showing exactly how you have connected everything?

    Regards,

    Adrian

  • 0 in reply to aozer
    Intellectual 520 points

    Hello, Adrian

    This is my connec diagram.

    In the diagram, the PGOOD? ,PMIC_Enable? and NERROUT? have not yet been connected.

    When I  only power the AWR1243, the SPI_CS, SPI_MOSI, SPI_MISO, HOSTINT and Nreset are high level. And I disconnect the HOSTINT, the situation is normal. The MSP430 dosen't work.

    When I only connect the HOSTINT, the MSP430 also be powered. Is there a possibility that MSP430 is powered because the P2.6 occurs current flow backward by HOSTINT?

  • 0 in reply to huangyaohui
    TI__Mastermind 30355 points

    hello,

    What is the signal on the MSP430 that the HOST_INT is connected to? 

    Regards,

    Adrian

  • 0 in reply to aozer
    Intellectual 520 points

    HOST_INT is connected with P2.6 of MSP430. The table of pin function is follow:

    I also tried to change the connection between HOST_INT and P2.6 to HOST_INT and P2.3. But it doesn't  have effect.

  • 0 in reply to huangyaohui
    TI__Mastermind 30355 points

    Hello,

    It just doesn't make sense that the HOST_INTR is driving the power of the MSP430. You can probe all of the pins you have connected and see what voltage they are at. The HOST_INTR should be pulled to GND by default unless the AWR device is expecting to receive a command from the host SPI. 

    I think you need to spend some time to debug your breadboard connections and understand the connections you are making to the MSP430 EVM. This does not sound like there is any issue with the mmWave EVM itself.

    Regards,

    Adrian