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AD22105AR 参数 Datasheet PDF下载

AD22105AR图片预览
型号: AD22105AR
PDF下载: 下载PDF文件 查看货源
内容描述: 低电压,电阻可编程恒温开关 [Low Voltage, Resistor Programmable Thermostatic Switch]
分类和应用: 开关传感器换能器温度传感器输出元件
文件页数/大小: 8 页 / 265 K
品牌: AD [ ANALOG DEVICES ]
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a
FEATURES
User-Programmable Temperature Setpoint
2.0 C Setpoint Accuracy
4.0 C Preset Hysteresis
Wide Supply Range (+2.7 V dc to +7.0 V dc)
Wide Temperature Range (–40 C to +150 C)
Low Power Dissipation (230 W @ 3.3 V)
APPLICATIONS
Industrial Process Control
Thermal Control Systems
CPU Monitoring (i.e., Pentium)
Computer Thermal Management Circuits
Fan Control
Handheld/Portable Electronic Equipment
Low Voltage, Resistor Programmable
Thermostatic Switch
AD22105
FUNCTIONAL BLOCK DIAGRAM
AD22105
200kΩ
R
PULL–UP
1
8
NC
OUT
2
SET–
POINT
3
7
V
S
GND
6
R
SET
NC
4
TEMPERATURE
SENSOR
5
NC
GENERAL DESCRIPTION
The AD22105 is a solid state thermostatic switch. Requiring
only one external programming resistor, the AD22105 can be set
to switch accurately at any temperature in the wide operating
range of –40°C to +150°C. Using a novel circuit architecture,
the AD22105 asserts an open collector output when the ambient
temperature exceeds the user-programmed setpoint temperature.
The AD22105 has approximately 4°C of hysteresis which prevents
rapid thermal on/off cycling.
The AD22105 is designed to operate on a single power supply
voltage from +2.7 V to +7.0 V facilitating operation in battery
powered applications as well as in industrial control systems.
Because of low power dissipation (230
µW
@ 3.3 V), self-
heating errors are minimized and battery life is maximized.
An optional internal 200 kΩ pull-up resistor is included to
facilitate driving light loads such as CMOS inputs.
Alternatively, a low power LED indicator may be driven directly.
+2.7V TO +7.0V
8
7
6
5
AD22105
TOP VIEW
R
SET
1
OUT
2
3
4
Figure 1. Typical Application Circuit
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703