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LM26CIM5-KLA Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM26CIM5-KLA Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
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1 / 9 page  LM26 SOT-23, ±3˚C Accurate, Factory Preset Thermostat General Description The LM26 is a precision, single digital-output, low-power thermostat comprised of an internal reference, DAC, tem- perature sensor and comparator. Utilizing factory program- ming, it can be manufactured with different trip points as well as different digital output functionality. The trip point (T OS) can be preset at the factory to any temperature in the range of −55˚C to +110˚C in 1˚C increments. The LM26 has one digital output (OS/OS/US/US), one digital input (HYST) and one analog output (V TEMP). The digital output stage can be preset as either open-drain or push-pull. In addition, it can be factory programmed to be active HIGH or LOW. The digital output can be factory programmed to indicate an over tem- perature shutdown event (OS or OS) or an under tempera- ture shutdown event (US or US). When preset as an over- temperature shutdown (OS) it will go LOW to indicate that the die temperature is over the internally preset T OS and go HIGH when the temperature goes below (T OS–THYST). Simi- larly, when preprogrammed as an undertemperature shut- down (US) it will go HIGH to indicate that the temperature is below T US and go LOW when the temperature is above (T US+THYST). The typical hysteresis, THYST, can be set to 2˚C or 10˚C and is controlled by the state of the HYST pin. A V TEMP analog output provides a voltage that is proportional to temperature and has a −10.82mV/˚C output slope. Available parts are detailed in the ordering information. For other part options, contact a National Semiconductor Dis- tributor or Sales Representative for information on minimum order qualification. The LM26 is currently available in a 5-lead SOT-23 package. Applications n Microprocessor Thermal Management n Appliances n Portable Battery Powered Systems n Fan Control n Industrial Process Control n HVAC Systems n Remote Temperature Sensing n Electronic System Protection Features n Internal comparator with pin programmable 2˚C or 10˚C hysteresis n No external components required n Open Drain or push-pull digital output; supports CMOS logic levels n Internal temperature sensor with V TEMP output pin n V TEMP output allows after-assembly system testing n Internal voltage reference and DAC for trip-point setting n Currently available in 5-pin SOT-23 plastic package n Excellent power supply noise rejection Key Specifications j Power Supply Voltage 2.7V to 5.5V j Power Supply Current 40µA(max) 20µA(typ) j Hysteresis Temperature 2˚C or 10˚C(typ) Temperature Trip Point Accuracy Temperature Range LM26CIM −55˚C to +110˚C ±3˚C (max) +120˚C ±4˚C (max) LM26CIM5-TPA Simplified Block Diagram and Connection Diagram 10132301 The LM26CIM5-TPA has a fixed trip point of 85˚C. For other trip point and output function availability, please see ordering information or contact National Semiconductor. March 2005 © 2005 National Semiconductor Corporation DS101323 www.national.com |
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