BQ27542-G1: The difference between capacity commands

Ross Lee

Part Number: BQ27542-G1

When I use the BQ27542 chip, I'm a bit confused about the following capacity commands. Is there any document/article that clarifies the differences between these commands?

NomAvailableCapacity()

FullAvailableCapacity()

RemainingCapacity()

FullChargeCapacity()

FullChargeCapacityFiltered()

FullChargeCapacityUnfiltered()

RemainingCapacityUnfiltered()

RemainingCapacityFiltered()

over 2 years ago

0 Wyatt Keller over 2 years ago

TI__Guru** 102355 points

Hello Ross,

Please see the TRM, in the introduction (6.1 Introduction) there is an explanation for NomAvailableCapacity() and FullAvailableCapacity().

RemnaingCapacity() is the remaining capacity that the gauge expects with the given load select.

FullChargeCapacity() is the full charge capacity given the specific temperature and the learned Qmax and load select.

Filtered and unfiltered are just the value before and after the smoothing engine is used on the data.

Any of the documentation regarding impedance track will help with the understanding of how the gauging parameters are calculated, like https://e2echina.ti.com/cfs-file/__key/telligent-evolution-components-attachments/00-24-00-00-00-00-02-91/Theory-and-Implementation-of-Impedance-Track-Battery-Fuel_2D00_Gauging-Algorithm.pdf

and https://www.ti.com/lit/wp/slpy002/slpy002.pdf

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ27542-G1: The difference between capacity commands