nPM1300 setup review with nRF5340

RE: nPM1300 setup review with nRF5340

Elfving — Mon, 16 Jun 2025 06:16:49 GMT

Could point. If this is only happening to a single board it could be a soldering issue.

I got some input from the relevant team here:

SHPHLD pin should not be connected directly to the nRF53 device, as this has a pull-up to VSYS/VBAT and can cause leakage. You normally connect this pin to a button or open-drain circuit. The PMIC will also reset if SHPHLD is pulled low for 10 seconds.
VBUS and VBUS_OUT seem to be missing capacitors as well.

Though none of these typically affect TWI communciation.

Maybe trying another board would be an idea.

Regards,

Elfving

RE: nPM1300 setup review with nRF5340

frogrammer — Fri, 13 Jun 2025 15:40:33 GMT

No i haven‘t checked but i tried to follow a setup which i have mentioned in the post description and later i have modified because i do not have enough space or i do not need it, i have shared that schematics in the comments.

I could try soldering another board, note: i do reflow soldering by myself and from the looks of it from outside it looks good, also it does give me 3.3v power. So i am assuming either my schematics is wrong or soldering shorts, i could take a look at it after any experts review.

RE: nPM1300 setup review with nRF5340

Elfving — Fri, 13 Jun 2025 13:50:04 GMT

I see. I'll ask the relevant team if they have any suggestions, and let you know once I hear from them.

Have you had the schematics reviewed by anyone from Nordic before btw (or before this ticket got created)?

Regards,

Elfving

RE: nPM1300 setup review with nRF5340

frogrammer — Wed, 11 Jun 2025 15:02:39 GMT

Yes, i am using ncs 2.6.1

I have exact setup as above comment as you can see where i have 4.7k ohm as a pull up resistor. I get 3.3v from VDD comming out from Vout2.

I have two other sensors on the i2c bus, i can view those properly.

RE: nPM1300 setup review with nRF5340

Elfving — Wed, 11 Jun 2025 14:26:37 GMT

Hi, Jared is currently busy, but I'll take over this case in the meantime.

You should be able to find the nPM1300 on your board, 0x6b is correct. Typical issues would be lack of pull resistors on the I2C lines, or VDDIO voltage mismatch.

Are you using NCS btw?

Regards,

Elfving

RE: nPM1300 setup review with nRF5340

frogrammer — Thu, 05 Jun 2025 07:14:41 GMT

Jared Hi, I have soldered this board, and immediately searched i2c devices on the board, i could find my other two sensors, but i couldn’t find nPM1300 i2c address on the search, which is supposed to be 0x6b? !, Although, According to the configuration i get 3.3 volts from the nPM1300 chip. Mind you i didn’t put any code or setup for the nPM1300 yet. Wasn’t it supposed to show atleast the i2c address so that i can control it?. ( I dont have any advanced debugging tool to view scl sda lines )

This were my updated schematic for the board :

RE: nPM1300 setup review with nRF5340

Jared — Wed, 07 May 2025 10:07:57 GMT

Hi,

[quote user=""]

I want 3.3V for the device and sensor systems, possibility of reducing it to another lower value using I2C.

[/quote]

GPIO voltage of nRF5340 follows VDD when the device is configured in high voltage mode. This voltage is configurable by writing to the VREGHVOUT register.

Voltage of the nPM1300 digital interface is set by VDDIO.

[quote user=""]I want to control the nPM1300 without any Buttons, possibly putting nPM1300 in Hibernation mode/Reset using nRF5340 BLE?[/quote]

Most of the features of the PMIC is configurable trough the I2C interface.

Host software can reset the device by writing the TASKSWRESET bit in register TASKSWRESET on page 125. As a consequence, a power cycle is performed. A reset is not possible in Ship or Hibernate mode

The device enters Ship mode through register TASKENTERSHIPMODE on page 120. Register SHPHLDCONFIG on page 120 configures the SHPHLD button press time, and register TASKSHPHLDCFGSTROBE on page 120 applies the configured value.

The device enters Hibernate mode through register TASKENTERHIBERNATE on page 119. The host software must wait until EVENTSVBUSIN0SET on page 138 to ensure VBUS is disconnected and discharged before writing to the register.

[quote user=""]from the datasheet of nRF5340 page 769 ''When supplying power from a USB source only, VBUS must be connected to VDDH if USB is to be used.'' , but i will have battery as well, so in that case when USB is not there, VDDH is connected to VBUS, is that okay?[/quote]

This sentence is referring to if you are supplying VBUS on the nRF5340 directly from a USB source. From your schematic you are supplying VBUS into the PMIC which again is supplying the nRF with VDD either from the battery or USB.

RE: nPM1300 setup review with nRF5340

helsing — Thu, 24 Apr 2025 13:44:16 GMT

Hi frogrammer, we will review the questions and get back to you in a few days.