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CC2640R2F: Power consumption comparison between external regulator mode (1.8V) and "normal operation" (3.3V) for CC2640

Al Wang
Prodigy 60 points
Part Number: CC2640R2F

Hello, 

For CC2640R2F or CC26xx family uC, there are two modes of power operation, namley "normal operation" mode (3.3V), where an internal LDO is also used as VDDR, and external regulator mode, where external 1.8V regulator is used for all supplies, VDDS/VDD2-3/VDDR. Do you guys know of any data or table in regard to advantages in power consumption for either mode? I understand that actual consumption may depends on multiple factors. But a ballpark comparison would be a quite informative.

Many thanks!

Albert

  • 0
    TI__Guru**** 171034 points

    Albert,

    Thanks for your inquiry. Indeed the datasheet tables show the operation in DCDC and LDO modes (Figures 8-10 and 8-11) which still have these peripherals still powered. The transition between the DCDC and LDO is around 2.1V.

    You can use these graphs to compare with the measurements performed on the application note Using the Wireless SimpleLink CC26xx in External Regulator Mode With the TPS62740 (SWRA498)

    Hope this helps,

    Rafael

  • 0 in reply to desouza
    Prodigy 60 points

    Hi, Rafael,

    Thank you for kind response and the application note. It does look like the two modes have quite similar power consumptions excluding quiescent current of external regulator. But for normal operation mode using internal DCDC and LDO,  is it okay to supply main VDDS to be equal to VDD2-3, say, 1.8-1.9V? Is it adquate for internal DCDC and LDO?

    Also in the application note, all the power consumption plots are versus "Supply Voltage." I assume the supply voltage means VDDS in the context, currect?

    Many thanks!

    Albert 

  • 0 in reply to Al Wang
    TI__Guru**** 171034 points

    Albert,

    Al Wang said:
    It does look like the two modes have quite similar power consumptions excluding quiescent current of external regulator.

    You are correct. The internal regulator requires some minimal power to operate.

    Al Wang said:
    is it okay to supply main VDDS to be equal to VDD2-3, say, 1.8-1.9V?

    I am not sure I fully understand your question - perhaps there was a typo. The device has three VDDS pins and two VDDR pins. All the VDDS pins can range from 1.8 to 3.8V and in normal operation the transition between the DCDC and GLDO occurs transparently.

    Al Wang said:
    I assume the supply voltage means VDDS in the context, currect?

    You are correct.

    Regards,

    Rafael