Datasheet

VREF COLD HOT
LTF TCO
VREF VREF
HOT COLD
TCO LTF
VREF
LTF
COLD
1 1
V RTH RTH
V V
RT2
V V
RTH 1 RTH 1
V V
V
1
V
RT1
1 1
RT2 RTH
æ ö
´ ´ ´ -
ç ÷
è ø
=
æ ö
æ ö
´ - - ´ -
ç ÷
ç ÷
è ø
è ø
-
=
+
TEMPERATURE RANGE TO
INITIATE CHARGE
TEMPERATURE RANGE
DURING A CHARGE CYCLE
CHARGE SUSPENDED
CHARGE SUSPENDED
VREF VREF
V
LTF
CHARGE at full C CHARGE at full C
V
HTF
V
TCO
CHARGE SUSPENDED
CHARGE SUSPENDED
AGND
AGND
V
LTFH
V
LTFH
V
LTF
REGN
TS
RT2
RT1
RTH
103AT
bq2419x
bq24190, bq24192
bq24192I, bq24193
SLUSAW5A –JANUARY 2012–REVISED OCTOBER 2012 www.ti.com
Figure 30. 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.
Figure 31. TS Pin Thermistor Sense Thresholds
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:
(2)
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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Product Folder Links: bq24190 bq24192 bq24192I bq24193