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AWR2243: 4 pcs Cascaded, power supply for master first, then power for slave?

Simon wang
Intellectual 410 points
Part Number: AWR2243

Hello team,

    I am designing cascaded radar based on 4 pcs AWR2243, confirm two thing:

1.  I choose LP87524P to supply AWR2243 as demo of TI recommend, from mmWave-Radar-Interface-Control.pdf, we need to supply master chip first, then supply slave, that means I have to use one pcs LP87524P+one pcs LDO(supply 3.3V IO) to supply master AWR2243(1.0V+1.2V+1.8V supply first, then 3.3V IO), then open two LP87524P+one pcs LDO to supply other 3 pcs slave chip, is it right? 

2. SPI protocal of AWR2243: protocal version ------4bit, how can I write this information, could you give explanation?  Page11 of mmWave-Radar-Interface-Control.pdf

  • 0
    TI__Mastermind 31680 points

    Hello Simon,

    Our Hardware expert will review your concern and get back to you early next week.

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Intellectual 410 points

    Dear Ishita

       Thanks! soft reminder: have your hardware expert review the two questions? could you give your great suggestions?

  • 0 in reply to Simon wang
    TI__Guru 58035 points

    Hello Simon,

    1) On the power supply, you can provide the supply to the master and slave devices simultaneously, that is not an issue. But the nRESET release (from the host processor) of the master should be done first and the slave device nRESET should be released only after the master device has been configured as master. Please refer to the mmwave DFP example code for reference.

    2) The protocol version is set within the mmwaveLink library. Once you use the mmwaveLink the low level configurations are taken care of within the library. Please refer to the mmwave DFP package for details.

    Regards,
    Vivek  

  • 0 in reply to Vivek Dham
    Intellectual 410 points

    Dear Vivek,

        thanks! but from the instruction of mmWave-Radar-Interface-Control.pdf, power supply for mater first, then slave. FYI! From my understanding you gives, I only release nReset of master, then configure master AWR2243, then release nRESET of slave, then configure slave, is it right?

  • 0 in reply to Simon wang
    TI__Guru 58035 points

    Hello Simon,

    The sequence in the ICD refers to the software sequence and in that context the "power up" means issuing of the rlDEvicePoweron() command in the mmwave LInk , which basically releases the nRESET of the AWR device.

    So yes, just releasing the nRESET of the master first and then slave is sufficient.

    Regards,
    Vivek