BQ24196_17 Datasheet, PDF (19/50 Pages) Texas Instruments – I2C Controlled 2.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

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REGN
bq24196
TS
bq24196
SLUSB98A – OCTOBER 2012 – REVISED DECEMBER 2014
RT1
RT2
RTH
103AT
Figure 14. TS Resistor Network
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.
VREF
TEMPERATURE RANGE TO
INITIATE CHARGE
TEMPERATURE RANGE
DURING A CHARGE CYCLE
VREF
CHARGE SUSPENDED
V_LTF
CHARGE SUSPENDED
V_LTF
V_LTFH
V_LTFH
CHARGE at full C
CHARGE at full C
V_HTF
AGND
CHARGE SUSPENDED
CHARGE SUSPENDED
Figure 15. TS Pin Thermistor Sense Thresholds
V_TCO
AGND
Assuming a 103AT NTC thermistor is used on the battery pack, the value RT1 and RT2 can be determined by
using the following equations:
RT2 =
V_VREF
´ RTH_COLD
´ RTH_HOT
´
æ
ç
è
1
V_LTF
-
1
V_TCO
ö
÷
ø
RTH_HOT
´
æ
ç
V_VREF
è ^VTCO
-
ö
1_÷
ø
-
RTH_COLD
´
æ
ç
è
V_VREF
V_LTF
-
ö
1_÷
ø
V_{VREF - 1}
RT1 =
V_LTF
1₊ 1
RT2 RTH_COLD
(1)
Select 0°C to 45°C range for Li-ion or Li-polymer battery,
RTH_COLD = 27.28 kΩ
RTH_HOT = 4.911 kΩ
RT1 = 5.52 kΩ
RT2 = 31.23 kΩ
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