Datasheet

PRECHARGE CCFAST
CHARGE
CVTAPER DONETHERMAL
REGULATION
BatteryVoltage
BatteryCurrent
HI-z
ICJunctionTemperature,T
J
V
O(REG)
I
O(CHG)
V
(LOWV)
I
(PRECHG)
I
(TERM)
T
J(REG)
bq24230
bq24232
www.ti.com SLUS821E –OCTOBER 2008–REVISED JANUARY 2014
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, I
NTC
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 (V
COLD
to V
HOT
), 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 V
DIS(TS)
. The battery pack temperature monitoring is disabled in all devices by
connecting a 10-kΩ resistor from TS to VSS.
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Product Folder Links: bq24230 bq24232