NRF52833 DCDC OUPUT CURRENT

RE: NRF52833 DCDC OUPUT CURRENT

Jared — Mon, 22 Aug 2022 11:19:31 GMT

To be precise, in High Voltage Mode, VDD will be equal to the output of REG0. The ouput of REG0 can be adjusted by writing to the REGOUT0 register in the UICR. If you set the output of REG0 to 2V4 then VDD will also be 2V4 and so will the GPIO high voltage.

[quote user="zuhaib"]i did not understand what do you mean by state of the regulator [/quote]

I was referring to the REG1 regulator.

regards

Jared

RE: NRF52833 DCDC OUPUT CURRENT

zuhaib — Mon, 22 Aug 2022 10:58:27 GMT

i did not understand what do you mean by state of the regulator

if i am supplying vddh with 3.7-4.2 volt battery and set the output level to 2.3vdd

gpio level also be the 2.3vdd right?

my 2.3 volt wont stable?

RE: NRF52833 DCDC OUPUT CURRENT

nRF5xFanboy — Mon, 22 Aug 2022 10:48:11 GMT

Hi Zuhaib,

https://infocenter.nordicsemi.com/pdf/nRF52833_PS_v1.5.pdf

See the chapter 5 for the information of power management.

and for the GPIO
see chapter "6.8.3.1 GPIO Electrical Specification"

Best regards,
nRF5xFanBoy

RE: NRF52833 DCDC OUPUT CURRENT

Jared — Mon, 22 Aug 2022 10:36:38 GMT

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

regards

Jared

RE: NRF52833 DCDC OUPUT CURRENT

nRF5xFanboy — Mon, 22 Aug 2022 09:28:35 GMT

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

RE: NRF52833 DCDC OUPUT CURRENT

zuhaib — Mon, 22 Aug 2022 09:27:48 GMT

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

RE: NRF52833 DCDC OUPUT CURRENT

Jared — Mon, 22 Aug 2022 09:26:30 GMT

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

RE: NRF52833 DCDC OUPUT CURRENT

zuhaib — Mon, 22 Aug 2022 09:19:31 GMT

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 ?

RE: NRF52833 DCDC OUPUT CURRENT

Jared — Mon, 22 Aug 2022 09:17:15 GMT

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