Part # LM27 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM27 SOT-23, ±3°C Accurate, 120°C-150°C Factory Preset Thermostat

Part Details:

LM27 September 2006 SOT LM27 -23, SOT-23, ±3°C Accurate, 120°C-150°C Factory Preset ± Thermostat 3°C General Description Applications Accurate, The LM27 is a precision, single digital-output, low-power n Microprocessor Thermal Management thermostat comprised of an internal reference, DAC, tem- n Appliances perature sensor and comparator. Utilizing factory program- n Portable Battery Powered Systems ming, it can be manufactured with different trip points as well n Fan Control as different digital output functionality. The trip point (T ) OS n Industrial Process Control can be preset at the factory to any temperature in the range n HVAC Systems of +120°C to +150°C in 1°C increments. The LM27 has one 120°C-150°C digital output (OS/OS/US/US), one digital input (HYST) and n Electronic System Protection one analog output (V ). The digital output stage can be TEMP preset as either open-drain or push-pull. In addition, it can be Features factory programmed to be active HIGH or LOW. The digital n Internal comparator with pin selectable 2°C or 10°C output can be factory programmed to indicate an over tem- hysteresis perature shutdown event (OS or OS) or an under tempera- n No external components required ture shutdown event (US or US). When preset as an over- n Open-drain or push-pull digital output; supports CMOS temperature shutdown (OS) it will go LOW to indicate that logic levels the die temperature is over the internally preset T and go OS n Internal temperature sensor with V output pin Factory HIGH when the temperature goes below (T ­T ). Simi- TEMP

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LM27.pdf Datasheet