Running my nRF52840 DK from a Li-Po

RE: Running my nRF52840 DK from a Li-Po

Naeem Maroof — Mon, 16 Oct 2023 12:12:49 GMT

Hello,

I am not sure if it is okay or not, but as per our documentation the SW9 should be in Li-Po position if we want to use the power from J6/P27 (Li-po battery), and then as the high voltage regulator is used, the VDD_nRF voltage can be set by the firmware of the SoC.

RE: Running my nRF52840 DK from a Li-Po

swood — Fri, 13 Oct 2023 15:23:51 GMT

Thank you, Naeem! It works when I don't put SW9 in the Li-Po position. Is this okay, instead of changing the value on the UICR (something something control register?)?

RE: Running my nRF52840 DK from a Li-Po

Naeem Maroof — Fri, 13 Oct 2023 15:18:39 GMT

Hello,

Thank you for your patience.

Li-po is to be connected to J6 connector. It should be chaged, but as you are checking voltage from P27, and it is 3.8V, doesn't look like any charging issue.

SW9 should be in li-on position and then we turn on the DK using SW8.

The nRF52840DK has a 5V boost regulator. It gives a stable output from Li-Po (J6) connectors.

The nRF52840 SoC has a high voltage buck regulator that can support up to 5 V input. When the SW9 in in li-po position, the high voltage regulator of the SoC is supplied directly from the Li-Po batter (J6). REGOUT0 register in the UICR contains the value for Output Voltage from REG0 regulator (high-voltage regulator) stage. Its default value is 1.8V.

BR, Naeem

RE: Running my nRF52840 DK from a Li-Po

Naeem Maroof — Thu, 12 Oct 2023 07:56:31 GMT

Hi Steph,

I have been assigned this ticket, and I will look into it and will respond to you accordingly.

Thank you for being patient.

BR, Naeem