BQ2063_15 Datasheet, PDF (47/60 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
self-discharge rate
The nominal self-discharge rate, %PERDAY (% per day), is programmed in an 8-bit value Self-Discharge Rate
EE 0x53 by the following relation:
Self-Discharge
Rate
+
256–
52.73
%PERDAY
(12)
light load estimate
The amount of light load current in mA, ILEAK, used for compensation is stored in Light Load Estimate in EE
0x64 as follows:
Light
Discharge
Current
+
ILEAK •
45
1024
(13)
ILEAK is between 0.044 and 11.2 mA.
charge efficiency
The bq2063 applies the efficiency factor, EFF%, to all charge added to the battery. EFF% is encoded in Charge
Efficiency EE 0x4d according to equation 16:
Charge Efficiency + (EFF% • 2.56–1)
(14)
battery electronics load
The amount of internal battery electronics load estimate in µA, BEL, is stored in Pack Load Estimate EE 0x1c
as follows;
Pack Load Estimate = 0.364 • BEL
charging voltage
The 16-bit value, Charging Voltage EE 0x0a-0x0b programs the ChargingVoltage( ) value broadcast to a Smart
Charger. It is also sets the base value for determining overvoltage conditions during charging and voltage
compliance during a constant-voltage charging methodology. It is stored in mV.
overvoltage
The 8-bit value, Overvoltage Margin EE 0x48, sets the limit over ChargingVoltage( ) that is to be considered
as an overvoltage charge-suspension condition. The voltage in mV above the ChargingVoltage( ), VOVM, that
should trigger a charge suspend is encoded in Overvoltage Margin as follows:
Overvoltage
Margin
+
VOVM
16
(15)
VOVM is between 0 and 4080 mV.
charging current
ChargingCurrent( ) values are either broadcast to a Level 2 Smart Battery Charger or read from the bq2063 by
a Level 3 Smart Battery Charger. The bq2063 sets the value of ChargingCurrent( ), depending on the charge
requirements and charge conditions of the pack.
When fast charge is allowed, the bq2063 sets ChargingCurrent( ) to the rate programmed in Fast Charging
Current EE 0x1a-0x1b. Fast Charging Current is stored in mA.
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