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AWR1843: PA LDO and RF LDO configuration

Tunc Ozdemir
Prodigy 20 points
Part Number: AWR1843

Hello,

I have designed a custom board with AWR1843. I connected the Vout_PA pins to the VIN_RF2 as shown in the evaluation board. I am supplying 1V to the VIN_RF1 and VIN_RF2 pins from an extarnal LDO just like the evaluation board. My concern is when I turn the device on for the first time what will be the default configuration for the RFLDO BYPASS_EN bits. I understand from the Interface Control Document, I am supposed to set them as 1, 1 to bypass the LDO and disable the PA_LDO. I am concerned if they start up on the wrong setting it may damage the board.

  1. What are the default configurations for the RFLDO BYPASS_EN bits?
  2. If they are set as 0 on start-up, how should I power the device for the first time to flash the memory?
  3. When the board starts up in SOP mode set for flashing what is the behavior of the LDO?

Thanks in advance, hope my questions were clear.

  • +1
    TI__Guru 58035 points

    Hello Tunc,

    These LDOs are turned ON only at RFinit() API, prior to that these LDOs are disabled. So you need not worry about the power up time configuration. Since you would be setting the configuration using the  RF_LDO BYPASS_EN before you call the RFinit() API, that should be sufficient. 

    Regards,
    Vivek