NRF52833 DCDC OUPUT CURRENT

[zuhaib]

WHAT IS THE MAXIMUM  OUTPUT CURRENT OF DCDC IN NRF52833 OUTPUT IN HIGH VOLTAGE AND NORMAL VOLTAGE MODE?

I AM POWERING UP TWO SENSORS WITH IT THAT USES CURRENT IN MICRO AMPS .

I AM NOT USING ANY EXTERNAL LDO FOR MY CIRCUIT I AM USING ONLY INTERNAL DCDC OF THE NRF52833 .

[Jared]

Hi,

External supply is not supported by the nRF52833. However, nRF52840 supports external supply and has a limit of 25 mA(depending on TX power).

regards

Jared 

[zuhaib]

can we please also know what will be the output if we use normal voltage mode 

in high voltage mode it is configurable. what about normal voltage mode

and also plz let me know will the gpio be also on this level ?

[Jared]

Hi,

DC/DC current will vary depending on the workload of the CPU. The device is not built for external supply so you shouldn't connect anything else on the DCDC pins. The GPIO high voltage level is always equal to VDD. 

regards

Jared 

[zuhaib]

will voltage also vary of this dcdc i am connecting it with a battery 3 to 4.2 volt

[nRF5xFanboy]

Hi Zuhaib,

I doubt the MCU internal LDO & DC/DC buck regulator is designed to drive external peripherals.
I think it is for the MCU itself.  Althoug the nrf52833 has the DCC pin as output.
This also explain the absence of technical information about the max. current of the DCC pin in the documentation of the MCU.

The gpio pin max current is written in the nrf52833 documentation (see the Nordic infocenter)

Best regards, 
    nRF5xFanBoy

[Jared]

Yes, it will vary depending on the state of the regulator,

regards

Jared