Battery_powered_wall_thermostat

Published:2009/7/24 2:49:00 Author:Jessie | From:SeekIC

Fig. 13-29 This circuit shows a battery-powered thermostat using an LTC1041.Temperature is sensed using a thermistor connected in a bridge with a potentiometer to set the desired temperature. However, the bridge is not driven from the battery but from pin 7 on the LTC1041. Pin 7 is the pulsed power (Vpp) output and turns on only while the LTC is sampling the inputs, thus keeping average power drain extremely low. A lithium battery will run the circuit for at least 10 years. A 2N6660 power MOSFET in a diode bridge switches the conventional 26 Vac heater-control circuitry. The 2N6660 requires no current from the battery. Linear Technology Linear Applications Handbook 1990 p AN23-6.



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