Low Voltage, Resistor Programmable
a
Thermostatic Switch
AD22105
FEATURES
FUNCTIONAL BLOCK DIAGRAM
User-Programmable Temperature Setpoint
2.08C Setpoint Accuracy
4.08C Preset Hysteresis AD22105
Wide Supply Range (+2.7 V dc to +7.0 V dc)
200k
Wide Temperature Range (408C to +1508C) R
8
PULLUP 1 NC
Low Power Dissipation (230 mW @ 3.3 V)
V
OUT
APPLICATIONS 2 7 S
Industrial Process Control
SET
POINT
Thermal Control Systems
GND R
3 6 SET
CPU Monitoring (i.e., Pentium)
Computer Thermal Management Circuits
TEMPERATURE
NC
NC
4 5
Fan Control SENSOR
Handheld/Portable Electronic Equipment
GENERAL DESCRIPTION
The AD22105 is designed to operate on a single power supply
The AD22105 is a solid state thermostatic switch. Requiring
voltage from +2.7 V to +7.0 V facilitating operation in battery
only one external programming resistor, the AD22105 can be set
powered applications as well as in industrial control systems.
to switch accurately at any temperature in the wide operating
Because of low power dissipation (230 W @ 3.3 V), self-
range of 40C to +150C. Using a novel circuit architecture,
heating errors are minimized and battery life is maximized.
the AD22105 asserts an open collector output when the ambient
An optional internal 200 k pull-up resistor is included to
temperature exceeds the user-programmed setpoint temperature.
facilitate driving light loads such as CMOS inputs.
The AD22105 has approximately 4C of hysteresis which prevents
Alternatively, a low power LED indicator may be driven directly.
rapid thermal on/off cycling.
+2.7V TO +7.0V
8 7 65
AD22105
R
SET
TOP VIEW
12 4
3
OUT
Figure 1. Typical Application Circuit
REV. 0
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reliable. However, no responsibility is assumed by Analog Devices for its
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which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-8703AD22105* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
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AD22105: Single-Supply Sensor Interface Amplifier Data
Sheet
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