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CC1350: Do I need to set the SET_CCFG_SIZE_AND_DIS_FLAGS_DIS_TCXO when using TCXO?

Egil Anonsen
Prodigy 160 points
Part Number: CC1350


Hi TI people!

First of all I must say you make really great products, and the Simplelink software you provide sure is top notch :)

However I have a question:

In our design we're using a TCXO, and in ccfg.c there's an option called SET_CCFG_SIZE_AND_DIS_FLAGS_DIS_TCXO.

When this is set to 0, the startup code in setup_rom.c will set the DDI_0_XOSC:XOSCHFCTL.BYPASS, which I assume bypasses the XOSC_HF.

In our code we currently don't enable this mode, and things seem to work ok, so what exactly does bypassing the XOSC_HF do?

Is it a pure power saving or is it something functional too? I guess you would recommend setting this CCFG flag whenever we use a TCXO?

Regards,

Egil

  • 0
    TI__Guru**** 317180 points
    In the xosc module it is possible to bypass the xosc core. The core is not needed when using a TCXO and this flag turn it off and therefore gives a small current save.

    The functionality with TCXO will be the same regardless of setting of SET_CCFG_SIZE_AND_DIS_FLAGS_DIS_TCXO.