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LM57

Texas Instruments
Part Number LM57
Manufacturer Texas Instruments
Description Resistor-Programmable Temperature Switch and Analog Temperature Sensor
Published May 19, 2023
Detailed Description Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM57 SNIS152E – MAY 2009 – REV...
Datasheet PDF File LM57 PDF File

LM57
LM57

Overview
Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM57 SNIS152E – MAY 2009 – REVISED JULY 2015 LM57 Resistor-Programmable Temperature Switch and Analog Temperature Sensor 1 Features •1 See LM57-Q1 Data Sheet for AEC-Q100 Grade 1/Grade 0/Grade 0 Extended (Qualified and Manufactured on an Automotive Grade Flow) • Trip Temperature Set by External Resistors with Accuracy of ±1.
7°C or ±2.
3°C from −40°C to +150°C • Resistor Tolerance Contributes Zero Error • Push-Pull and Open-Drain Switch Outputs • Wide Operating Temperature Range of −50°C to 150°C • Very Linear Analog VTEMP Temp Sensor Output with ±0.
8°C or ±1.
3°C Accuracy from −50°C to +150°C • Short-Circuit Protected Analog and Digital Outputs • Latching Function for Digital Outputs • TRIP-TEST Pin Allows In-System Testing • Low Power Minimizes Self-Heating to Under 0.
02°C 2 Applications • Factory Automation • Industrial • Automotive • Down Hole • Avionics • Telecom Infrastructure LM57 Overtemperature Alarm VDD Supply (+2.
4V to +5.
5V) 3 Description The LM57 device is a precision, dual-output, temperature switch with analog temperature sensor output for wide temperature industrial applications.
The trip temperature (TTRIP) is selected from 256 possible values in the range of –40°C to 150°C.
The VTEMP is a class AB analog voltage output that is proportional to temperature with a programmable negative temperature coefficient (NTC).
Two external 1% resistors set the TTRIP and VTEMP slope.
The digital and analog outputs enable protection and monitoring of system thermal events.
Built-in thermal hysteresis (THYST) prevents the digital outputs from oscillating.
The TOVER and TOVER digital outputs will assert when the die temperature exceeds TTRIP and will de-assert when the temperature falls below a temperature equal to TTRIP minus THYST.
TOVER is active-high with a push-pull structure.
TOVER is active-low with an open-drain structure.
Tying TOVER to TRIP-TEST will latch the output a...


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