NRF52840 module power consumption changes with different vref values

RE: NRF52840 module power consumption changes with different vref values

noy_e — Tue, 25 Jun 2024 15:27:34 GMT

Yes that was the issue. Thank you very much!

Noy

RE: NRF52840 module power consumption changes with different vref values

Stanley — Tue, 25 Jun 2024 07:08:19 GMT

Hi Noy,

The problem should be the input voltage of VDDH. The voltage difference between VDDH and VDD must be at least 0.3V.

Thanks,

Stanley

RE: NRF52840 module power consumption changes with different vref values

Håkon Alseth — Tue, 18 Jun 2024 12:08:46 GMT

Hi,

Is VDDH 3.3V or greater?

If not, there will be issues, as per the description here: https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=5_0_0_4_2_0_0#unique_809995893

When you say nothing is connected, does this also mean the UART? TXD is pulled to VDD, which can draw excessive current.

Kind regards,

Håkon

RE: NRF52840 module power consumption changes with different vref values

noy_e — Tue, 18 Jun 2024 11:08:59 GMT

Yes that's correct. nothing is connected to the board, and when I set REGOUT to 3.0V (instead of 1.8V) the power consumption increases to around 50uA.

Thank you,

Noy

RE: NRF52840 module power consumption changes with different vref values

Håkon Alseth — Tue, 18 Jun 2024 09:10:22 GMT

Hi,

[quote user="noy_e"]Sorry I was wrong, I tested it when nothing was connected to the gpios and still got the same results.[/quote]

Sorry, I'm not quite sure I follow. Do you mean that there's nothing connected to your board, and you still get a higher consumption?

Kind regards,

Håkon

RE: NRF52840 module power consumption changes with different vref values

noy_e — Tue, 18 Jun 2024 05:46:49 GMT

Hi,

Sorry I was wrong, I tested it when nothing was connected to the gpios and still got the same results.

RE: NRF52840 module power consumption changes with different vref values

Håkon Alseth — Mon, 17 Jun 2024 08:33:25 GMT

Hi,

What else do you have connected other than I2C? Have you tried using zephyr/samples/basic/blinky (with CONFIG_SERIAL=n) to see if this also has the same current consumption problem?

Kind regards,

Håkon

RE: NRF52840 module power consumption changes with different vref values

noy_e — Mon, 17 Jun 2024 05:33:25 GMT

There are GPIO's that are connected to voltage nets as should be.

there is I2C that has pull up to 3.3V, which means that for 1.8V vRef should have higher leak current.

RE: NRF52840 module power consumption changes with different vref values

Håkon Alseth — Thu, 13 Jun 2024 14:11:50 GMT

Hi,

Is there anything connected to the GPIOs, for instance over I2C or similar?

If you connect voltage nets that differ, you will leak current through those nets.

Kind regards,

Håkon