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AWR1642: Any API or register to know internal LDO status? (bypass mode or non-bypass mode)

James Austrial
Expert 4090 points
Part Number: AWR1642

Hi,

We're using LP87524J+LC Filter solution.

From SW side, we use rlRfSetLdoByassConfig() to set internal LDO as bypass mode.

Everything works fine and board is working well now.

The question I have is: Is there any API or register know internal LDO status? (We need to know it's in bypass mode or in non-bypass mode)

I've checked Datasheet, TRM and DFP documents. I found nothing.

  • 0
    TI__Guru 69960 points
    Hello James,
    When you call rlRfSetLdoByassConfig() [ldoBypassEnable=1] API with apropriate parameter then BSS will do the requested action (LDA Bypass).
    So you can rely on API call and it's return value (0: success) to confirm that LDO-bypass is set in the device.

    There is no other way to get LDO bypass status.

    Do you feel that LDO bypass is not come in effect after calling rlRfSetLdoByassConfig API?


    Regards,
    Jitendra
  • 0 in reply to Jitendra Gupta
    TI__Expert 4090 points
    Do you feel that LDO bypass is not come in effect after calling rlRfSetLdoByassConfig API?
    => I'm not able to answer it. The rlRfSetLdoByassConfig() API return value is success and board is working fine.
    Base on the result, I do believe the LDO bypass is working. However, there's no solid evidence to backup my statement.

    That's why I'm seeking a API or register to show LDO status.

    Mmm... Maybe we can think from other side, if RF power input is 1.0V but LDO bypass mode is disable. (1.3V expected) What happens? Will the board still work?

    If it doesn't work, that's pretty good and it's also an indirect evidence and we can close the thread.
  • 0 in reply to James Austrial
    TI__Guru 69960 points
    Hi James,
    If API returns '0', means success and BSS has applied the requested setting.
    And if power input is 1v but LDO bypass mode is disable then you will lot of performance degradation (Tx power, chirp performance etc.) which you won't see if LDO bypass is enable with 1v power input.


    Regards,
    Jitendra
  • 0 in reply to Jitendra Gupta
    TI__Expert 4090 points
    Perfect!! This is a way to verify it.
    This answered the question and I closed the thread