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LM57 - Resistor-Programmable Temperature Switch And Analog Temperature Sensor

General Description

The LM57 is a precision, dual-output, temperature switch with integrated analog temperature sensor.

The trip temperature (TTRIP) is programmable by using two external 1% resistors.

Key Features

  • Trip temperature set by external resistors.
  • External resistor tolerance contributes zero error.
  • Push-pull and open-drain temperature switch outputs.
  • Wide operating temperature and trip-temperature range of.
  • 50°C to 150°C.
  • Very linear analog VTEMP temperature sensor output.
  • Analog and digital outputs are short-circuit protected.
  • TRIP-TEST pin allows in-system testing.
  • Latching function for the digital outputs.
  • Very small 2.5 mm by 2.5 mm 8-Pin.

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Datasheet Details

Part number LM57
Manufacturer National Semiconductor Corporation
File Size 329.47 KB
Description Resistor-Programmable Temperature Switch And Analog Temperature Sensor
Datasheet download datasheet LM57 Datasheet

Full PDF Text Transcription for LM57 (Reference)

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LM57 Resistor-Programmable Temperature Switch and Analog Temperature Sensor LM57 February 9, 2010 Resistor-Programmable Temperature Switch and Analog Temperature Sensor G...

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sistor-Programmable Temperature Switch and Analog Temperature Sensor General Description The LM57 is a precision, dual-output, temperature switch with integrated analog temperature sensor. The trip temperature (TTRIP) is programmable by using two external 1% resistors. Using extremely small packaged resistors (0.5 mm x 1 mm), the LM57 can be programmed to any of 256 trip temperatures while consuming very little board space. The VTEMP output delivers an analog output voltage which is proportional with a negative temperature coefficient (NTC) to the measured temperature. Built-in temperature hysteresis (THYST) keeps the outp