LM66 - National Semiconductor

LM66 Dual Output Internally Preset Thermostat

The LM66 is a precision low power thermostat. Two stable temperature trip points (VT1 and VT2) are generated by dividing down the LM66 1.250V bandgap voltage reference using a resistors divider network. The LM66 has two digital outputs. OUT1 goes LOW when the temperature exceeds T1 and goes HIGH when the the temperature goes below (T1–THYST). Similarly, OUT2.

Features

n n n n n Digital outputs support TTL logic levels Internal temperature sensor 2 internal comparators with hysteresis Internal voltage reference Currently available in 8-pin SO plastic package Key Specifications n Power Supply Voltage n Power Supply Current n VREF n Hysteresis Temperature n Internal Temperature Sensor Output Voltage (+6.20 mV/˚C x T) +400 mV ± 3˚C (max) n Temperature Trip Point Accuracy n T1 set point +73˚C n T2 set point +82˚C 2.7V to 10V 250 µA (max) 1.250V ± 1.4% (max) 5˚C Applications n n n n n n n Microprocessor Thermal Management Appliances Portable Battery Powered 3.0.