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| BQ24230 Datasheet, PDF (22/33 Pages) Texas Instruments – USB-FRIENDLY LITHIUM-ION BATTERY CHARGER AND POWER-PATH MANAGEMENT IC | |||
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bq24230
bq24232
SLUS821A â OCTOBER 2008 â REVISED DECEMBER 2008 .......................................................................................................................................... www.ti.com
PRECHARGE
THERMAL
REGULATION
CC FAST
CHARGE
CV TAPER
DONE
VO(REG)
IO(CHG)
Battery Voltage
Battery Current
V(LOWV)
I(PRECHG)
I(TERM)
HI-z
TJ(REG)
IC Junction Temperature, TJ
Figure 30.
BATTERY PACK TEMPERATURE MONITORING
The bq2423x features an external battery pack temperature monitoring input. The TS input connects to the NTC
resistor in the battery pack to monitor battery temperature and prevent dangerous overtemperature conditions.
During charging, INTC is sourced to TS and the voltage at TS is continuously monitored. If, at any time, the
voltage at TS is outside of the operating range (VCOLD to VHOT), charging is suspended. The timers maintain their
values but suspend counting. When the voltage measured at TS returns to within the operation window, charging
is resumed and the timers continue counting. When charging is suspended due to a battery pack temperature
fault, the CHG pin remains low and continues to indicate charging.
For the bq24230, battery pack temperature sensing is disabled when termination is disabled (TD = High) and the
voltage at TS is greater than VDIS(TS). The battery pack temperature monitoring is disabled in all devices by
connecting a 10-k⦠resistor from TS to VSS.
22
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): bq24230 bq24232
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