BQ2084-V140_14 Datasheet, PDF (9/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

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LABEL
Misc. Config
TS Const1 A3
TS Const2 A2
TS Const3 A1
TS Const4 A0
Min Temp AD
Max Temp
bq2084-V140
SLUS664B – JULY 2005 – REVISED AUGUST 2006
FUNCTIONAL DESCRIPTION (continued)
Table 1. Data Flash Settings for Internal or External Temperature Sensor
LOCATION
Dec (Hex)
42 (0x2a)
164/5 (0xb5/6)
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)
Bit 7 = 1
0 (0x0000)
0 (0x0000)
–11136 (0xd480)
5734 (0x1666)
0 (0x0000)
5734 (0x1666)
EXTERNAL TEMP SENSOR SETTING
(Semitec 103AT)
Dec (Hex)
Bit 7 = 0
–28285 (0x9183)
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-V140. Table 3 describes
the bq2084-V140 registers.
Figure 1. bq2084-V140 Gas Gauging Operational Overview
The bq2084-V140 accumulates a measure of charge and discharge currents and estimates self-discharge of the
battery. The bq2084-V140 compensates the charge current measurement for temperature and state-of-charge of
the battery. The bq2084-V140 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-V140 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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