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AD22105 Datasheet

Thermostatic Switch

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Data Sheet
Low Voltage, Resistor-Programmable,
Thermostatic Switch
AD22105
FEATURES
User-programmable temperature setpoint
±2.0°C maximum ambient setpoint accuracy
4.1°C typical hysteresis
Wide supply range: 2.7 V to 7.0 V
Wide temperature range: −40°C to +150°C
Low power dissipation
APPLICATIONS
Industrial process control
Thermal control systems
CPU monitoring
Computer thermal management circuits
Fan control
Handheld/portable electronic equipment
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 −40°C to +150°C
wide operating range. 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 and off cycling.
The AD22105 operates 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 at 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 complementary metal–oxide
semiconductor (CMOS) inputs.
Alternatively, a low power light emitting diode (LED) indicator
can be driven directly.
FUNCTIONAL BLOCK DIAGRAM
RPULL–UP 1
AD22105
200kΩ
8 NC
OUT 2
GND 3
NC 4
SET-
POINT
TEMPERATURE
SENSOR
7 VS
6 RSET
5 NC
Figure 1.
Rev. A
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rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1996–2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD22105 Datasheet

Thermostatic Switch

No Preview Available !

AD22105
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 8
The Setpoint Resistor ................................................................... 8
REVISION HISTORY
10/2018—Rev. 0 to Rev. A
Update Format ....................................................................Universal
Changes to Features Section............................................................ 1
Changed Product Description Section to Theory of Operation
Section................................................................................................ 8
Changed Application Hint Section to Applications Information
Section.............................................................................................. 10
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
1/1996—Revision 0: Initial Version
Data Sheet
Effect of Resistor Tolerance and Thermal Drift on Setpoint
Accuracy .........................................................................................8
Hysteresis and Self Heating..........................................................9
Output Section...............................................................................9
Mounting Considerations ............................................................9
Thermal Environment Effects .....................................................9
Using the AD22105 as a Cooling Setpoint Detector ................9
Applications Information .............................................................. 10
Electromagnetic Interference (EMI) Suppression ................. 10
Leakage at the RSET Pin............................................................... 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
Rev. A | Page 2 of 11


Part Number AD22105
Description Thermostatic Switch
Maker Analog Devices
Total Page 11 Pages
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