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）， selfheating errors are minimized and battery life is maximized. An optional internal 200 k? pull-up resistor is included to facilitate driving light loads such as CMOS inputs. Alternatively， a low power LED indicator may be driven directly.