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CC2640: Current consumption for different advertising intervals

Mujahid Abbas
Expert 2860 points
Part Number: CC2640

Hello,

We have to choose TI cc2640 or Nordic nrf51 chip for our new project. I have done Analysis of the current consumption for cc2640 using different advertising intervals and got almost the same results as calculated from TI power consumption calculator.

The Nordic power consumption calculator shows less current consumption for nrf51 using the same advertising intervals.

I got following is the comparison:

Current Consumption Comparison

Advertising interval (ms) Current (mA) from TI Calculator
for cc2640		 Current (mA) from Nordic calculator
 for NRF51
152.5 0.14669 0.092
211.25 0.10624 0.067
318.75 0.07082 0.045
417.5 0.05436 0.035
546.25 0.04183 0.027
760 0.03041 0.020
852.5 0.02725 0.018
1022.5 0.02292 0.016
1285 0.01849 0.013

Is this difference is realistic why Nordic is consuming less power then TI?

As our product is power critical we want to save energy as much as possible. Is it possible to go below these values of current for cc2640 ?

Waiting for your kind reply.


Regards

  • 0
    TI__Guru** 105180 points
    Hello,

    I can't comment on the nRF51 values since this device is not sold by TI. Have you done actual measurements on both platforms and considered MCU processing capability/efficiency, range/link budget, throughput, etc. Note that TI quotes total MCU current consumption for ADV/connection states whereas some vendors only list the radio current consumption in their respective data sheets. Again, I can't comment specifically on this device but you can do a side-by-side evaluation with actual dev kits.

    Best wishes
  • 0 in reply to JXS
    Expert 2860 points

    Hello JXS,

    Thanks for your reply. I have done actual measurements on cc2640 and results are close enough to what calculator give. Is there any possibility to go further down (by putting the device to shutdown for some time and again adv after some time) then these values of current ?

    Regards

    MAbbas

  • 0 in reply to Mujahid Abbas
    TI__Guru** 105180 points
    HI MAbbas,

    What else are you doing in your system beyond ADV? Do you use connections?

    Shutdown requires a full boot so you would need to use the power analyzer to compare energy consumption for different ADV intervals.

    Best wishes
  • 0
    Expert 2225 points
    Hi mabbas,
    This comparison is hard to find the correct result. It depends on many reasons
    + The way the ble stack work. I worked on TI and Nordic. The way they work is completely different.
    + Components on the boards. The reference design of TI and nordic are different.
    + The cost of IC.
    ...