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| BQ2057DGKR Datasheet, PDF (13/24 Pages) Texas Instruments – ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO CELL LITHIUM-POLYMER | |||
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APPLICATION INFORMATION
bq2057, bq2057C
bq2057T, bq2057W
SLUS025F â MAY 2001 â REVISED JULY 2002
battery temperature monitoring (continued)
For PTC Thermistors
Ç Ç 5
RT1 + 3
RTH RTC
RTH * RTC
(5)
ƪ ƫ RT2 +
5
Ç2
RTH RTC
RTHÇâÇ7 RTCÇ
(6)
Where R(TC) is the cold temperature resistance and R(TH) is the hot temperature resistance of thermistor, as
specified by the thermistor manufacturer.
RT1 or RT2 can be omitted If only one temperature (hot or cold) setting is required. Applying a voltage between
the V(TS1) and V(TS2) thresholds to pin TS disables the temperature-sensing feature.
DC+
RSNS
BAT+
DC+
BAT+
RT1
DCâ
RT2
bq2057
SNS
COMP
BAT
CC
VCC
VSS
TS
STAT
High-Side Current Sensing
BATâ
Thermistor
DCâ
bq2057
SNS
COMP
BAT
CC
VCC
VSS
TS
STAT
RT1
Thermistor
RT2
BATâ
RSNS
Low-Side Current Sensing
Figure 9. Temperature Sensing Circuits
Temperature Fault
VCC
V(TS2)
Normal Temperature Range
Temperature Fault
V(TS1)
VSS
Figure 10. bq2057 TS Input Thresholds
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