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參數(shù)資料
| 型號： | UB2012AG-S08-R |
| 廠商： | UNISONIC TECHNOLOGIES CO LTD |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | HALOGEN FREE, SOP-8 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 315K |
| 代理商： | UB2012AG-S08-R |
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
11 of 17
www.unisonic.com.tw
QW-R121-018 .b
APPLICATION INFORMATION(Cont.)
BATTERY TEMPERATURE MONITORING
The UTC UB2012 continuously monitors temperature by measuring the voltage between the TS and VSS pins.
A negative- or a positive-temperature coefficient thermistor (NTC, PTC) and an external voltage divider typically
develop this voltage. (See Figure 9.) The UTC UB2012 compares this voltage against its internal V(TS1) and V(TS2)
thresholds to determine if charging is allowed. (See Figure 10.) The temperature sensing circuit is immune to any
fluctuation in VCC, since both the external voltage divider and the internal thresholds (V(TS1) and V(TS2) ) are
referenced to VCC.
The resistor values of R(T1) and R(T2) are calculated by the following equations:
For NTC Thermistors:
)
R
(
×
3
R
×
R
×
5
=
R
TH
TC
TH
1
T
-
(3)
)]
R
×
7
(
-
)
R
×
2
[(
R
×
R
×
5
=
R
TH
TC
TH
2
T
(4)
For PTC Thermistors:
)
R
(
×
3
R
×
R
×
5
=
R
TC
TH
TC
TH
1
T
-
(5)
)]
R
×
7
(
-
)
R
×
2
[(
R
×
R
×
5
=
R
TC
TH
TC
TH
2
T
(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.
UTC
UB2012
SNS
BAT
VCC
TS
STAT
VSS
CC
COMP
BAT-
BAT+
RSNS
DC+
DC-
RT1
RT2
Thermistor
Figure 7. Temperature Sensing Circuits
Figure 8. UTC UB2012 TS Input Thresholds
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