nPM1100 questions and observations

RE: nPM1100 questions and observations

DBT — Thu, 06 Feb 2025 14:00:23 GMT

I just received an email today stating "There is a new Product Change Notice 213 for nPM1300, in which the battery detection functionality has been removed and is no longer required to initiate charging. This functionality has been removed from the nPM1300 Product Specification v1.2.
The improved revision of the nPM1300 fixes erratas from nPM1300 Revision 1 Errata v1.2." so it sounds like this issue might be addressed in nPM1300

RE: nPM1100 questions and observations

Bendik Heiskel — Thu, 06 Feb 2025 09:14:46 GMT

Hi,

Not sure what happened to this ticket, but I update with an answer(better late than never).

During the battery detection the VBAT pin will be raised to above 2.1V, if the battery is under 2.1V the 1uF capacitor on the VBAT pin will keep the voltage on the VBAT pin long enough for the charging to start.

Without the capacitor the VBAT voltage will drop to 0V after the battery detection and trigger over discharge protection immediately resulting in the charger not starting.

If you have any more questions please open a new ticket.

Best regards,

Bendik

RE: nPM1100 questions and observations

DBT — Mon, 03 Feb 2025 13:55:21 GMT

No, I didn't get answers beyond what is here, but at that point we had decided not to pursue nPM1100 further. I would suggest you look at the nPM1300, nPM2100 and nPM6001 as well to see which would be best for your application, and then get an EK board to try it out before designing it in.

RE: nPM1100 questions and observations

Ecic2002 — Sun, 02 Feb 2025 05:28:17 GMT

We are currently evaluating the nPM1100 for a new design. Did you ever receive an update from Nordic regarding this issue?

RE: nPM1100 questions and observations

DBT — Tue, 31 May 2022 15:16:56 GMT

Please clarify the "battery detection phase" behavior.

Assuming the cell voltage and pack voltage are >=2.8V, charging will start as expected.

If cell voltage = 2.1V (pack voltage = 0V) the battery detection phase will apply some minimal charge current to the battery, see the 2.1V and continue charging?

If cell voltage < 2.1V (let's say its 1.5V) (pack voltage = 0V) the battery detection phase will apply some minimal charge current to the battery, see the 1.5V and disable charging?

RE: nPM1100 questions and observations

Bendik Heiskel — Mon, 30 May 2022 14:09:58 GMT

Hi again,

Sorry for the delay.

[quote user=""]Is it correct that if our battery gets into this state, the nPM1100 will never charge it? [/quote]

There is a battery detection phase at the beginning of the charge, this should rise the voltage on VBAT pin above 2.8V to trigger the protection and close the protection device.

[quote user=""] Is there some reason these pins should not be changed dynamically? [/quote]

Changing these pins dynamically may have an effect. But there is no guarantee changing these after power-on reset won't introduce unwanted behavior.

[quote user=""]4. POR: Datasheet section "3.3 Power-on reset (POR) and brownout reset (BOR)" states "VBATPOR has a minimum and maximum range. To ensure the device exits reset, the voltage should be above the maximum of the parameter." but Table 15 only gives a typical value of VBATpor, not max/min values.[/quote]

The maximum value for VBATPOR is 2.8V

Best regards,

Bendik

RE: nPM1100 questions and observations

Bendik Heiskel — Wed, 11 May 2022 11:26:32 GMT

Hi,

I have asked internal for clarification on this and will update you.

Best regards,

Bendik