Unsure about nPM2100 power consumption

RE: Unsure about nPM2100 power consumption

Simonr — Wed, 17 Jun 2026 07:48:59 GMT

These should be grounded to avoid noise to and from the unconnected I2C pins. The design checklist is downloadable here: https://docs.nordicsemi.com/r/bundle/pdf_design_checklist/page/pdf/design_checklist/design_checklist.html

Best regards,

Simon

RE: Unsure about nPM2100 power consumption

Daniel Dakhno — Tue, 16 Jun 2026 09:21:37 GMT

Oh no, I keep on forgetting about grounding the I2C pins. Is the chip going to read random data when the pins are left floating?

RE: Unsure about nPM2100 power consumption

Simonr — Tue, 16 Jun 2026 08:58:52 GMT

Hi Daniel

This looks better and corresponds to the reference. The traces not connected to anything here can be entirely removed, and the SCL/SDA pins should still be connected to GND if they're not in use.

Best regards,

Simon

RE: Unsure about nPM2100 power consumption

Daniel Dakhno — Sat, 13 Jun 2026 00:12:38 GMT

I understand, thanks.

Attached is my second attempt, hopefully with a higher chance of success...devzone.nordicsemi.com/.../npm2100_5F00_caaa_5F00_config1.zip

RE: Unsure about nPM2100 power consumption

Simonr — Mon, 01 Jun 2026 12:55:50 GMT

Please follow the PCB layout guidelines and reference circuitry here and copy it as closely as you can and we'll do a full review of your board afterwards.

Best regards,

Simon

RE: Unsure about nPM2100 power consumption

Daniel Dakhno — Mon, 01 Jun 2026 07:58:13 GMT

Hey,

thanks for your feedback!

Apart from the I2C pins, could you please point me at where I deviated from the reference design?

Cheers!

RE: Unsure about nPM2100 power consumption

Simonr — Mon, 01 Jun 2026 07:22:22 GMT

From looking at your PCB, it seems like you haven't followed the reference design for the nPM2100 here exactly, so we strongly recommend that you take another swing at the PCB layout where you follow the reference design guidelines from the datasheet as closely as possible.

Also, make sure there is a design checklist, where for example SCL / SDA should be connected to GND if not used.

Best regards,

Simon

RE: Unsure about nPM2100 power consumption

Daniel Dakhno — Sun, 31 May 2026 22:39:30 GMT

Hello,

thanks a lot for the reply!

I have attached the KiCad files of my PCB, I'd be grateful for a review!

Cheers!devzone.nordicsemi.com/.../battery_5F00_ic.zip

RE: Unsure about nPM2100 power consumption

Simonr — Fri, 29 May 2026 11:43:36 GMT

1 & 4. The PPK2 is not good at powering nPM2100. This is a known issue. See nPM2100 FAQ Frequently asked questions for the nPM2100 PMIC - Blogs - Nordic Blog - Nordic DevZone for reference.

2. You can use nPM2100 without configuring I2C, as basically just a boost converter with pin configured output voltage.

3. We have efficiency and performance plots in the datasheet with different supply voltage levels you can refer to.

If you can upload schematics and gerber files of the PCB layout that would be helpful for us, as it's hard to say something for certain based on the description you shared here.

Best regards,

Simon