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參數(shù)資料
| 型號(hào)： | LM27CIM5X-ZHJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SOT-23, 【3∑C Accurate, 120∑C-150∑C Factory Preset Thermostat |
| 中文描述： | DIGITAL TEMP SENSOR-SINGLE TRIP POINT, 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | PLASTIC, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大?。?/td> | 586K |
| 代理商： | LM27CIM5X-ZHJ |
LM27
SOT-23, ±3C Accurate, 120C-150C Factory Preset
Thermostat
General Description
The LM27 is a precision, single digital-output, low-power
thermostat comprised of an internal reference, DAC, tem-
perature sensor and comparator. Utilizing factory program-
ming, it can be manufactured with different trip points as well
as different digital output functionality. The trip point (T
OS)
can be preset at the factory to any temperature in the range
of +120C to +150C in 1C increments. The LM27 has one
digital output (OS/OS/US/US), one digital input (HYST) and
one analog output (V
TEMP). The digital output stage can be
preset as either open-drain or push-pull. In addition, it can be
factory programmed to be active HIGH or LOW. The digital
output can be factory programmed to indicate an over tem-
perature shutdown event (OS or OS) or an under tempera-
ture shutdown event (US or US). When preset as an over-
temperature shutdown (OS) it will go LOW to indicate that
the die temperature is over the internally preset T
OS and go
HIGH when the temperature goes below (T
OS–THYST). Simi-
larly, when preprogrammed as an undertemperature shut-
down (US) it will go HIGH to indicate that the temperature is
below T
US and go LOW when the temperature is above
(T
US+THYST). The typical hysteresis, THYST, can be set to
2C or 10C and is controlled by the state of the HYST pin. A
V
TEMP analog output provides a voltage that is proportional
to temperature and has a 10.7mV/C output slope.
Currently, there are several standard parts available, see
ordering information for details. For other part options, con-
tact a National Semiconductor Distributor or Sales Repre-
sentative for information on minimum order qualification. The
LM27 is currently available in a 5-lead SOT-23 package.
Applications
n
Microprocessor Thermal Management
n
n
Portable Battery Powered Systems
n
Fan Control
n
Industrial Process Control
n
HVAC Systems
n
Electronic System Protection
Features
n
Internal comparator with pin selectable 2C or 10C
hysteresis
n
No external components required
n
Open-drain or push-pull digital output; supports CMOS
logic levels
n
Internal temperature sensor with V
TEMP output pin
n
V
TEMP output allows after-assembly system testing
n
Internal voltage reference and DAC for trip-point setting
n
Currently available in 5-pin SOT-23 plastic package
n
Excellent power supply noise rejection
Key Specifications
j Power Supply Voltage
2.7V to 5.5V
j Power Supply Current
40A(max)
15A(typ)
j Hysteresis Temperature
2C or 10C(typ)
j Temperature Trip Point Accuracy
±3C (max)
LM27CIM5-2HJ Simplified Block Diagram and Connection Diagram
20030701
The LM27CIM5-2HJ has a fixed trip point of 140C.
For other trip point and output function availability,
please see ordering information or contact National Semiconductor.
September 2006
LM27
SOT
-23,
±
3C
Accurate,
120C-150C
Factory
Preset
Thermostat
2006 National Semiconductor Corporation
DS200307
www.national.com
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