Low Voltage, Resistor-Programmable,
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
Industrial process control
Thermal control systems
Computer thermal management circuits
Handheld/portable electronic equipment
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
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