LM57 Datasheet PDF - National Semiconductor Corporation Resistor-Programmable Temperature Switch And Analog Temperature Sensor Specs

LM57 - Resistor-Programmable Temperature Switch And Analog Temperature Sensor

Datasheet Summary

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.

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.

Datasheet Details

Part number	LM57
Manufacturer	National Semiconductor Corporation
File Size	329.47 KB
Description	Resistor-Programmable Temperature Switch And Analog Temperature Sensor
Datasheet	LM57 Datasheet
Additional preview pages of the LM57 datasheet.

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Full PDF Text Transcription

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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 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 output stable in an environment of thermal oscillation.

Published: Jul 13, 2009 |