APPLICATION NOTE 67

Applying and Using the DS1620 in Temperature Control Applications


Abstract: The DS1620 digital thermometer and thermostat provides three thermostat outputs (THIGH, TLOW and TCOM) that can be used to control a fan or heater. There are two user-programmable thresholds (TH and TL) that control the three outputs. When the measured temperature exceeds TH, THIGH is driven high. When the measured temperature falls below TL, TLOW is driven high. The TCOM output is driven high when the temperature exceeds TH, and it remains high until the temperature falls below TL. The threshold settings are stored in nonvolatile EEPROM, so that TH and TL can be programmed prior to installation for standalone thermostat operation.