bq24296
bq24297
SLUSBP6A –SEPTEMBER 2013–REVISED OCTOBER 2013
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When the TS fault occurs, the fault register REG09[2:0] indicates the actual condition on each TS pin and an INT
is asserted to the host. The STAT pin indicates the fault when charging is suspended.
TEMPERATURE RANGE
TEMPERATURE RANGE TO
INITIATE CHARGE
DURING A CHARGE CYCLE
VREF
VREF
CHARGE SUSPENDED
CHARGE SUSPENDED
VLTF
VLTF
VLTFH
VLTFH
CHARGE at full C
CHARGE at full C
VHTF
VTCO
CHARGE SUSPENDED
CHARGE SUSPENDED
AGND
AGND
Figure 31. TS Pin Thermistor Sense Thresholds in Charge Mode
Temperature Range to
Boost
VREF
Boost Disable
V
BCOLDx
(-
10ºC / 20ºC)
Boost Enable
V
BHOTx
(55ºC / 60ºC / 65ºC)
Boost Disable
AGND
Figure 32. TS Pin thermistor Sense Thresholds in Boost Mode
Assuming a 103AT NTC thermistor is used on the battery pack Figure 31, the value RT1 and RT2 can be
determined by using the following equation:
æ
ç
è
ö
÷
ø
1
1
VVREF ´RTHCOLD ´RTHHOT
´
-
VLTF VTCO
RT2 =
æ
ç
è
ö
æ
ç
è
ö
VVREF
VVREF
RTHHOT
´
-1 - RTH
´
-1
÷
÷
COLD
VTCO
VLTF
ø
ø
VVREF
-1
VLTF
RT1=
1
1
+
RT2 RTHCOLD
(1)
Select 0°C to 45°C range for Li-ion or Li-polymer battery,
RTHCOLD = 27.28 kΩ
RTHHOT = 4.911 kΩ
30
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