NRF52840 power consumption using only DC/DC of REG1

[Sebastian]

Hi All,

I have a question about NRF52840 power consumption. It is not very clear from the datasheet what is the power consumption if I'd like to use only one of the DC/DC converters (i.e REG1).

The scenario is the following: I supply 3V regulated on VDD and I enable the DC/DC of REG1.

Is the MCU power consumption the one mentioned in page 19 of the objective specification as IDDFlash/MHZ = 56uA/MHZ

and the radio as mentioned in page 288 as

ITX,0dbm,DCDC = 4.9mA

OR the power consumption is different and if so what is it?

Thank you for your answers.

[Petter Myhre]

It should be REG1 only as long as nothing else is stated, so ITX,0dBM,DCDC,5V,REG0HIGH is with REG0, while ITX,0dBM,DCDC is with REG1 only. I agree that this is a bit unclear, hopefully it is clearer when final version of the PS is out.

So with 3V, DCDC and REG1 only you can look at

IDDFLASHCACHEDCDC 3.6mA for the CPU

and

ITX,0dBM,DCDC 4.9mA for the radio current consumption when transmitting.

IDDFLASHDCDC/MHz is just 3.6mA / 64MHz = 56uA/MHz.

[Sebastian]

Thanks Petter. A Nordic engineer has been assigned to this. So let's see what they will say. 

[Petter Myhre]

I am a Nordic engineer.

[Sebastian]

Sorry for the very late reply Petter. I lost the email notification and just now managed to read your answer. 

Thank you very much. This can be closed now.