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參數資料
| 型號： | AT1457 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 1-CELL LITHIUM AND LITHIUM POLYMER CHARGE MANAGEMENT IC |
| 中文描述： | 1節鋰和鋰聚合物充電管理IC |
| 文件頁數： | 10/12頁 |
| 文件大小： | 287K |
| 代理商： | AT1457 |
AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879 Email:
service@aimtron.com.tw
10
3. Battery Temperature Monitor
The AT1457 continuously monitors temperature by measuring the voltage between
the TS and VSS pins. A negative or a positive temperature coefficient thermistor
(NTC or PTC) and external voltage divider typically develop this voltage. The
AT1457 compares this voltage against its internal VTS1 and VTS2 threshold to
determine if charging is allowed.
The resistor value of RT1 and RT2 ars calculated by the following equations:
For NTC Thermistor
For PTC Thermistor
RTC is the cold temperature resistance and RTH is the hot temperature resistance of
thermistor.
(
) (
)
[
]
TH
TC
TC
T
TH
×
7
TC
×
TC
TH
T
R
R
R
×
R
R
R
R
5
R
R
R
×
=
×
×
×
=
2
)
(
3
5
2
1
(
)
[
]
TC
TH
TC
×
TH
T
TC
×
7
TH
×
TC
TH
T
R
R
R
R
R
R
R
5
R
R
R
×
=
×
×
×
=
2
)
(
3
5
2
1
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