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CC2640R2F: Hardware questions

Ritika Agarwal
Prodigy 20 points

Part Number: CC2640R2F

These are hardware questions related to CC2640R2F device

-          What are the pros/cons of using internal LDO vs internal DCDC vs external regulator?

-          Why is the standby current higher with external oscillator compared to internal one?

-          What are the pros/cons of using external oscillator vs internal RC oscillator? What is the purpose of 2 oscillators on chip?

-           Since the memory size of the device is quite limited, is there any external low power memory that you guys can recommend for use?

  • 0
    TI__Guru** 106705 points
    Hi Ritika,

    1) Using the DCDC regulator will give lower current consumption. At 3 V the consumption is about 50% higher without the DCDC. Refer to the typical characteristics section in the datasheet for details.
    2) This is due to the nature of the oscillator design and the current required to drive the crystal. Note that in a BLE connection using the internal 32 kHz RC oscillator will increase the current consumption due to reduced accuracy.
    3) Basically accuracy as described above.
    4) You can refer to the LaunchPad reference design for example.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Prodigy 20 points

    HI Friedrik,

    Thanks for your answers. 

    1. So using DCDC regulator vs LDO will give us increased efficiency, but what are pros/cons of using internal DCDC vs external regulator?

  • 0 in reply to Ritika Agarwal
    TI__Guru** 106705 points
    Hi Ritika,

    External regulator can give you a wider voltage range, but it requires more components (the regulator IC itself for example). Here is an application note about it: www.ti.com/.../swra498

    Cheers,
    Fredrik