BQ2084-V133 Datasheet, PDF (9/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V133
www.ti.com
SLUS640A – JUNE 2005 – REVISED JUNE 2005
FUNCTIONAL DESCRIPTION (continued)
Table 1. Data Flash Settings for Internal or External Temperature Sensor (continued)
LABEL
TS Const2 A2
TS Const3 A1
TS Const4 A0
Min Temp AD
Max Temp
LOCATION
Dec (Hex)
166/7 (0xb7/8)
168/9 (0xb9/a)
170/1 (0xbb/c)
172/3 (0xbd/e)
174/5 (0xbf/c0)
INTERNAL TEMP
SENSOR SETTING
Dec (Hex)
0 (0x0000)
–11136 (0xd480)
5734 (0x1666)
0 (0x0000)
5734 (0x1666)
EXTERNAL TEMP SENSOR SETTING
(Semitec 103AT)
Dec (Hex)
20848 (0x5170)
–7537 (0xe28f)
4012 (0x0fac)
0 (0x000)
4012 (0x0fac)
GAS GAUGE OPERATION
General
The operational overview in Figure 1 illustrates the gas gauge operation of the bq2084-V133. Table 3 describes
the bq2084-V133 registers.
Figure 1. bq2084-V133 Gas Gauging Operational Overview
The bq2084-V133 accumulates a measure of charge and discharge currents and estimates self-discharge of the
battery. The bq2084-V133 compensates the charge current measurement for temperature and state-of-charge of
the battery. The bq2084-V133 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-V133 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.
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