BQ2084DBTG4 datasheet(10/69 Pages) TI

Part #	BQ2084DBTG4

Description	SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

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Main Gas-Gauge Registers

bq2084-V143

SLUS732 – SEPTEMBER 2006

Figure 1. bq2084-V143 Gas Gauging Operational Overview

The bq2084-V143 accumulates a measure of charge and discharge currents and estimates self-discharge of the

battery. The bq2084-V143 compensates the charge current measurement for temperature and state-of-charge of

the battery. The bq2084-V143 also adjusts the self-discharge estimation based on temperature.

The main charge counter RemainingCapacity() (RM) represents the available capacity or energy in the battery at

any given time. The bq2084-V143 adjusts RM for charge, self-discharge, and other compensation factors. The

information in the RM register is accessible through the SMBus interface and is also represented through the

LED display.

The FullChargeCapacity() (FCC) register represents the last measured learned full discharge of the battery. It is

used as the battery full-charge reference for relative capacity indication. The bq2084-V143 updates FCC after

the battery undergoes a qualified discharge from nearly full to a low battery level. FCC is accessible through the

SMBus interface.

The Discharge Count Register (DCR) is a non-accessible register that tracks discharge of the battery. The

bq2084-V143 uses the DCR register to update the FCC register if the battery undergoes a qualified discharge

from nearly full to a low battery level. In this way, the bq2084-V143 learns the true discharge capacity of the

battery under system-use conditions.

RemainingCapacity() (RM)

RM represents the remaining capacity in the battery. The bq2084-V143 computes RM in units of either mAh or

10 mWh depending on the selected mode. See Battery Mode() (0x03) for units configuration. RM counts up

during charge to a maximum value of FullChargeCapacity() (FCC) and down during discharge and

self-discharge to a minimum of 0. In addition to charge and self-discharge compensation, the bq2084-V143

calibrates RM at three low-battery-voltage thresholds, EDV2, EDV1, and EDV0 and three programmable

midrange thresholds VOC25, VOC50, and VOC75. This provides a voltage-based calibration to the RM counter.

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