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AD22105AR Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD22105AR
Szczegółowy opis  Low Voltage, Resistor Programmable Thermostatic Switch
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Strona internetowa  http://www.analog.com
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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.
a
Low Voltage, Resistor Programmable
Thermostatic Switch
AD22105
© 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
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
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 k
Ω pull-up resistor is included to
facilitate driving light loads such as CMOS inputs.
Alternatively, a low power LED indicator may be driven directly.
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.
FUNCTIONAL BLOCK DIAGRAM
1
2
3
4
8
7
6
5
NC
VS
RSET
NC
RPULL–UP
OUT
GND
NC
TEMPERATURE
SENSOR
200k
SET–
POINT
AD22105
12
3
4
8
7
65
OUT
+2.7V TO +7.0V
RSET
AD22105
TOP VIEW
Figure 1. Typical Application Circuit


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