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Original question:

CCS/CC2652R: CC2652R SDK

CC2652R: External regulator mode, VDDS_DCDC and DCDC_SW connections

Costantino Santoni
Prodigy 120 points
Part Number: CC2652R
Other Parts Discussed in Thread: CC2650, CC2642R, CC2640R2F, CC2652P, CC2640,

I would like to know if I could apply the design in the pdf page below:

CC2650EM-4XS-Ext-Reg_2_0_0_Schematic.pdf

taken from a cc2650 application example using an external regulator, or if I should change those two pins' value in order to make it work properly on a cc2652r device.

I'm referring to the connections with ground of the pins VDDS_DCDC and DCDC_SW.

Thanks for the attention.

  • 0
    TI__Genius 11810 points

    Hi, 

    Yes. CC2652R is now supporting external regulator mode. You must connect VDDS_DCDC and DCDC_SW as in the reference design. This is also described here: http://www.ti.com/lit/pdf/swra640

    -Simon

  • 0 in reply to Simon J
    Prodigy 120 points

    sorry but the link you provide does not work.

    please could you confirm that in external regulator mode VDDS_DCDC and DCDC_SW must be connected to ground?

  • 0 in reply to Costantino Santoni
    TI__Genius 11810 points

    Stange, let me check why the app note is not online anymore. 

    Yes, you must connect VDDS_DCDC and DCDC_SW to ground.

    -Simon

  • 0 in reply to Simon J
    Prodigy 120 points

    "Yes, you must connect VDDS_DCDC and DCDC_SW to ground?"

     


    No, I do not have to; I would just like to know what is the best pin configuration for the cc2652r in case of an external regulator mode.

    What this cc26xx family pdf suggests me is to put them to ground, similarly to the reference design I posted at my first question:

    (source: page 42 of )

    however when I open another pdf about the specific device cc2652r, it tells me to:

    (source: page 9 of )

    in case of non utilization of the DCDC converter pins  such as my external regulator mode case.

    That's why I would like a confirmation about the right configuration of those two specific pins.

    Thank you for the attention

  • 0 in reply to Costantino Santoni
    TI__Genius 11810 points

    Hey, 

    First, sorry for the typo in the previous post - the question mark should not have been there since it was not a question from my end. 

    To use external regulator you have to connect VDDS_DCDC to gnd, this way the power management circuit will know that CC26xx is operating in external regulator mode and it is no need to use the internal DCDC. DCDC_SW should be connected to gnd to avoid any unintentional leakage since the DCDC is not operating. 

    Since external regulator mode has not yet been officially supported on CC26x2, the DS does not reflect this mode of operation. However, we will support this mode and the datasheet will be updated very soon. Until then, please refer to the CC26x0 documentation. 

    Thanks,
    Simon

  • 0 in reply to Simon J
    Prodigy 120 points

    I see. Thank you for the answer. It's useful and complete.

    Have a good day,

    Costantino

  • 0 in reply to Simon J
    Prodigy 120 points

    "To use external regulator you have to connect VDDS_DCDC to gnd, this way the power management circuit will know that CC26xx is operating in external regulator mode and it is no need to use the internal DCDC. DCDC_SW should be connected to gnd to avoid any unintentional leakage since the DCDC is not operating."

     


    Simon, may I ask a confirmation that this concept can be applied also to a cc2642?

  • 0 in reply to Costantino Santoni
    TI__Genius 11810 points

    Yes, this applies to CC2640, CC2650, CC2640R2F, CC2642R, CC2652R, CC2652P, CC2652RB. 

    -Simon