±0.7°C Temperature Sensor with Resistor-Programmable Temperature Switch

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Product details

Parameters

SetPoint type Resistor Programmable SetPoint value (deg C) -40 to 150 Operating temperature range (C) -50 to 150 Accuracy over temp range (Max) (C) 1.5 Sensor gain (mV/Deg C) -5.2 to -12.9 Output type Open Drain, Push Pull Supply voltage (Min) (V) 2.4 Supply voltage (Max) (V) 5.5 Supply current (Typ) (uA) 24 Comparator channels (#) 1 Features Built-in hysteresis Rating Catalog Interface type Analog output, Switch open-in-new Find other Temperature switches

Package | Pins | Size

TSSOP (PW) 8 19 mm² 3 x 6.4 WSON (NGR) 8 6 mm² 2.5 x 2.5 open-in-new Find other Temperature switches

Features

  • See LM57-Q1 datasheet 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 and Trip-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 -40°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
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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 after it trips. The output can be cleared by forcing TRIP-TEST low. Driving the TRIP-TEST high will assert the digital outputs. A processor can check the state of TOVER or TOVER, confirming they changed to an active state. This allows for in-situ verification that the comparator and output circuitry are functional after system assembly. When TRIP-TEST is high, the trip-level reference voltage appears at the VTEMP pin. The system could then use this voltage to calculate the threshold of the LM57.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet LM57 Resistor-Programmable Temperature Switch and Analog Temperature Sensor datasheet (Rev. E) Jul. 15, 2015
Technical articles How to choose the right thermistor for your temperature sensing application Feb. 12, 2020
Technical articles How to enable thermal safety for automotive infotainment and cluster systems Oct. 15, 2019
Technical articles Driving industrial innovation with small-size sensors Sep. 12, 2019
Technical articles How sensor technology is evolving to meet cold chain needs Jun. 18, 2018
User guides LM57EVM Evaluation Module (EVM) User's Guide Sep. 11, 2013
Application notes AN-1984 LM57 Temperature Switch vs Thermistors (Rev. C) May 01, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
99
Description

The Texas Instruments LM57EVM evaluation module helps designers evaluate the operation and performance of the LM57 Resistor-Programmable Temperature Switch and Analog Temperature Sensor.

Features
  • 8 pin header brings all package pins out for ease of characterization and testing
  • The board is user-friendly, and has access to the temp sensor output pins
  • Allow to set 256 possible trip points by inserting two external axial resistors on the Rsense2A and Rsense2B socket

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 8 View options
WSON (NGR) 8 View options

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