nPM1100 questions and observations

RE: nPM1100 questions and observations

user25696 — 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

user104202 — 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

user104202 — Wed, 11 May 2022 11:26:32 GMT

Hi,

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

Best regards,

Bendik