BQ2063_15 Datasheet, PDF (45/60 Pages) Texas Instruments – SBS v1.1-COMPLIANT Li-ION GAS-GAUGE IC

Not Recommended For New Designs
bq2063
SBS v1.1ĆCOMPLIANT LiĆION GASĆGAUGE IC
WITH PROTECTOR INTERFACE
SLUS468E− MAY 2001 − REVISED APRIL 2002
PROGRAMMING INFORMATION
EDV thresholds and near full percentage (continued)
The bq2063 updates FCC if a qualified discharge occurs from a near-full threshold of FCC − NFW, until EDV2
condition is reached. The desired near-full threshold window, NFW (mAh), is programmed in Near Full in EE
0x55.
Near
Full
+
NFW
2
(8)
EVD discharge rate and temperature compensation
If EDV compensation is enabled, the bq2063 calculates battery voltage to determine EDV0, EDV1, and EDV2
thresholds as a function of battery capacity, temperature, and discharge load. The general equation for EDV0,
EDV1, and EDV2 calculation is
EDV0,1,2 = EMF • FBL - | ILOAD | • R0 • FTZ
(9)
Where:
EMF is a no-load battery voltage higher than the highest EDV threshold computed. EMF is programmed in
mV in EMF/EDV1 EE 0x74-0x75.
ILOAD is the current discharge load magnitude.
FBL is the factor that adjusts the EDV voltage for battery capacity and temperature to match the no-load
characteristics of the battery.
FBL = f ( C0, C + C1, T )
(10)
Where:
C (either 0%, 3%, or Battery Low % for EDV0, EDV1, and EDV2, respectively) and C0 are the capacity-
related EDV adjustment factors. C0 is programmed in EDV C0 Factor/EDV2 EE 0x78−79. C1 is the desired
residual battery capacity remaining at EDV0 (RM = 0). The C1 factor is stored in EDV C1 Factor EE 0x06.
T is the current temperature in °K.
R0 • FTZ represents the resistance of the battery as a function of temperature and capacity.
FTZ = f ( R1 , T0, T, C + C1, TC)
(11)
R0 is the first order rate dependency factor stored in EDV R0 Factor EE 0x7a-0x7b.
T is the current temperature; C is the battery capacity relating to EDV0, EDV1, and EDV2.
R1 adjusts the variation of impedance with battery capacity. R1 is programmed in EDV R1 Rate Factor EE
0x7c-0x7d.
T0 adjusts the variation of impedance with battery temperature). T0 is programmed in EDV T0 Rate Factor EE
0x76-0x77.
TC adjusts the variation of impedance for cold temperatures (T < 23°C). TC is programmed in EDV TC EE 0x07.
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