BQ24195: REGN and PMID definitions

Hi,

1. REGN is internal LDO regulator. PM100mV ID is the direct power input for the charger.

2. 100mV or 300mV is referenced to VREG (REG04[7:2]).

Thanks,

Ning.

Hi Ning,

Thanks for responding!

I should have asked differently and I apologize for any confusion.

1) What do the letters stand for? Example: POR stands for Power On Reset

2) I was really asking multiple questions here so please allow me to clarify:

2.1.a  "When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle." ¹

2.1.b "When a full battery voltage is discharged below recharge threshold (REG04[0]), the bq24195L, bq24195 automatically starts another charging cycle." ²

The term “full battery” is what’s throwing me off and of the two statements here, the second statement, while self contradicting, makes more sense that the first sentence. My rationale for saying this is that, referring to 2.1.a, a "full battery" will have a voltage around 4.1 to 4.2 V and never fall below the VRECHG threshold, therefore it shouldn’t be referred to as a “full battery”.

The statement in 2.1.b again uses the phrase “full battery”, but this time adds the fact that the battery has been “discharged”, however it says that when the battery voltage drops below the VRECHG threshold another charging cycle is initiated. You stated that VRECHG threshold (100 mV or 300 mV) is referenced to VREG (REG04[7:2]). This means if VREG is set to 4.208 V (default) and VRECHG is set to 100 mV (default) the recharge cycle will initiate when the battery voltage drops below 4.108.

VREG (4.208 V) - VRECHG (100 mV) = 4.108 V therefore VRECHG can’t be referenced to VREG or to GND as I stated in my original query.

2.1) The PCM on my battery has an Overdischarge threshold of 2.50 V and I want my battery recharge cycle to initiate at 3.0 V so how do I achieve this?

2.2) Does or can the phrase “full battery” mean something other than a battery that is full?  Please note this is just a confusing/irritating point for me considering my background in Metrology where accuracy and precision are the order of the day.

References are within Datasheet SLUSB97A

¹ section 5 the last sentence of the 4^th

² section 8.3.3.1 the last sentence of the paragraph under the bullets

Thanks Much,

Vernon