±0.7°C Temperature Sensor with Resistor-Programmable Temperature Switch - LM57

LM57 (ACTIVE)

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

 

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.

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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Parametrics Compare all products in Temperature Switches / Thermostats

 
Operating Temperature Range (C)
Accuracy Over Temp Range (Max) (C)
Sensor Gain (mV/Deg C)
SetPoint Value (deg C)
SetPoint Type
Output Type
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Typ) (uA)
# Comparators
Features
Rating
Package Group
Package Size: mm2:W x L (PKG)
Interface
LM57 LM26LV LM56 TMP300 TMP708 TMP709
-50 to 150    0 to 150    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
1.5    2.3    3    2    3    3   
-5.2 to -12.9    -5.1 to -12.8    6.2    10       
-40 to 150    Range (0 to 150)
50, 60, 65, 70
75, 80, 85, 90
95, 100, 105, 110
115, 120, 125, 130
135, 140, 145, 150   
-40 to 125    -40 to 125    0 to 125    0 to 125   
Resistor Programmable    Factory Programmed    Resistor Programmable    Resistor Programmable    Resistor Programmable    Resistor Programmable   
Open Drain
Push Pull   
Open Drain
Push Pull   
Open Drain    Open Drain    Open Drain    Open Drain   
2.4    1.6    2.7    1.8    2.7    2.7   
5.5    5.5    10    18    5.5    5.5   
24    8    230    110    40    40   
1    1    2    1    1    1   
Built-in Hysteresis
Hysteresis (5°C or 10°C)
Temperature Sensor and Switch
Trip Test   
Built-in Hysteresis
Hysteresis (5°C)
Temperature Sensor and Switch
Trip Test   
Built-in Hysteresis
Hysteresis (5°C)
Temperature Sensor and Switch   
Hysteresis (5°C or 10°C)
Pin-Selectable Hysteresis
Temperature Sensor and Switch   
Hysteresis (10°C or 30°C)
Pin-Selectable Hysteresis   
Hysteresis (2°C or 10°C)
Pin-Selectable Hysteresis   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
TSSOP
WSON   
WSON    SOIC
VSSOP   
SC70
SOT-23   
SOT-23    SOT-23   
8TSSOP: 19 mm2: 6.4 x 3(TSSOP)
See datasheet (WSON)   
See datasheet (WSON)    8SOIC: 29 mm2: 6 x 4.9(SOIC)
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
6SC70: 4 mm2: 2.1 x 2(SC70)
6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
Analog Output
Switch   
Analog Output
Switch   
Analog Output
Switch   
Analog Output
Switch   
Switch    Switch   

Other qualified versions of LM57

Version Part Number Definition
Automotive LM57-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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