Current consumption of the nRF52 Development Board at 1,8V

RE: Current consumption of the nRF52 Development Board at 1,8V

Heiner — Fri, 30 Aug 2019 17:11:05 GMT

[quote userid="13562" url="~/f/nordic-q-a/51608/current-consumption-of-the-nrf52-development-board-at-1-8v/207192"]The DK is not really intended to be run at 1.8V[/quote]

That makes sense.

Thank you for the detailed description.

RE: Current consumption of the nRF52 Development Board at 1,8V

haakonsh — Fri, 30 Aug 2019 14:53:02 GMT

[quote user="Heiner"]I'll just estimate the runtime with the power I measured at 3.3V then.[/quote]

The efficiency of the DCDC converter probably drops by 5% or something, so add that to your power estimation.

[quote user="Heiner"]Do you know what is causing the current draw in particular? Is it the MCU used for debugging?[/quote]

The debugger MCU, power supply circuits for buttons and leds, the on-board flash, etc.

The DK is not really intended to be run at 1.8V.

RE: Current consumption of the nRF52 Development Board at 1,8V

Heiner — Fri, 30 Aug 2019 14:12:48 GMT

Hi Haakonsh,

thank you for the quick answer.

My guess was also that the DC/DC is less efficient at 1.8V, but not this much.

I'll just estimate the runtime with the power I measured at 3.3V then.

Do you know what is causing the current draw in particular? Is it the MCU used for debugging?

Best,

Heiner

RE: Current consumption of the nRF52 Development Board at 1,8V

haakonsh — Fri, 30 Aug 2019 09:34:43 GMT

It's the DK and it's power supply. The nRF52 itself will behave just as you predict, a slightly higher current consumption due to the law of energy conservation and the lower efficiency of the DCDC converter at 1.8V.