BQ2083-V1P3 Datasheet, PDF (19/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

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bq2083-V1P3
SLVS508 − OCTOBER 2003
D When Miscellaneous Configuration (0x2a) bit 5 AC is set, and the AFE has failed at least AFE Fail Times (DF
0xd3, d4)
The bq2083−V1P3 checks the programming of the AFE registers at a period determined by AFE Check Time DF
0xe4. The units of the check period are seconds unless the bq2083−V1P3 is in sleep mode, in which case the period
is AFE Check Time x Sleep Current Time (DF 0xe7). If the data is not correct, the bq2083−V1P3 increments an
internal counter.
The CVOV flag in PackStatus() (0x2f) is set in any of the following ways:
D Voltage() ≥ ChargingVoltage() + OverVoltageMargin (DF 0x5a and 0x5b)
D AverageCurrent() ≥ FastCurrent + OvercurrentMargin (DF 0x5c and 0x5d)
D Any cell voltage ≥ CellOverVoltage (DF 0x60 and 0x61)
D The BatteryStatus() Over temperature bit is set
An example circuit using the SAFE output to blow a fuse is shown in Figure 5.
VCC
FUSE
Cell 4
BAT+
1 MΩ
0.1 µF
BSS84
SAFE
100 kΩ
1 MΩ
2N7002
Figure 5. Example SAFE Circuit Implementation
Low-Power Modes
The bq2083−V1P3 enters sleep mode when the charge and discharge current is less than the threshold programmed
in Sleep Current Threshold DF 0xe5, the SMBus lines are low for at least 2 s, and bit 4 of Misc. Configuration DF
0x2a is set to zero. The bq2083−V1P3 wakes up periodically to monitor voltage and temperature and to apply
self-discharge adjustment. The sleep period is set in Sleep Timer DF 0xe7. The bq2083−V1P3 wakes up at a period
set by Sleep Current Time DF 0xe6 to measure current. The bq2083−V1P3 comes out of sleep when the SMBus
lines go high or if the current is greater than Sleep Current Threshold. A rising edge on SMBC or SMBD restores the
bq2083−V1P3 to the full operating mode.
Reset Conditions
On power-up the entire IC is reset and data is loaded from Data Flash to configure the SBS Data and the system.
On a partial reset (loss of VCC but RBI holds RAM valid) then a limited number of actions are taken.
These actions are the following:
D The AFE registers are rewritten.
D PackStatus() VDQ flag is cleared (the proposed change is not to clear VDQ).
D PackStatus() EDV2 flag is cleared.
D BatteryStatus() DISCHARGING flag is cleared.
D The charger and alarm broadcast period is set to 10 seconds between broadcasts.
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