BQ2060SS Datasheet, PDF (8/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

bq2060
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
Table 1. Example VCELL1–VCELL4 Divider and Input Range
VOLTAGE INPUT
VCELL₄
VCELL₃
VCELL₂
VCELL₁
VOLTAGE DIVISION RATIO
16
16
8
8
FULL-SCALE INPUT
(V)
20
20
10
10
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Table 2. SRC Input Range
SENSE RESISTOR (Ω)
0.02
0.03
0.05
0.10
FULL-SCALE INPUT
(A)
±12.5
±8.3
±5.0
±2.5
Temperature
The TS input of the bq2060 with an NTC thermistor measures the battery temperature as shown in Figure 5. The
bq2060 reports temperature in Temperature(). THON may be used to connect the bias source to the thermistor
when the bq2060 samples the TS input. THON is high impedance for 60 ms when the temperature is measured,
and driven low otherwise.
GAS GAUGE OPERATION
General
The operational overview in Figure 6 illustrates the gas gauge operation of the bq2060. Table 3 describes the
bq2060 registers.
The bq2060 accumulates a measure of charge and discharge currents and estimates self-discharge of the
battery. The bq2060 compensates the charge current measurement for temperature and state-of-charge of the
battery. The bq2060 also adjusts the self-discharge estimation based on temperature.
Figure 6. bq2060 Operational Overview
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