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  • LM57-Q1 Resistor-Programmable Temperature Switch and Analog Temperature Sensor

    • SNIS191A July   2015  – July 2015 LM57-Q1

      PRODUCTION DATA.  

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  • LM57-Q1 Resistor-Programmable Temperature Switch and Analog Temperature Sensor
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Device Comparison Table
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 LM57-Q1 VTEMP Temperature-to-Voltage Transfer Function
        1. 7.3.1.1 LM57-Q1 VTEMP Voltage-to-Temperature Equations
      2. 7.3.2 RSENSE
      3. 7.3.3 Resistor Selection
      4. 7.3.4 TOVER and TOVER Digital Outputs
        1. 7.3.4.1 TOVER and TOVER Noise Immunity
      5. 7.3.5 Trip Test Digital Input
      6. 7.3.6 VTEMP Analog Temperature Sensor Output
        1. 7.3.6.1 VTEMP Noise Considerations
        2. 7.3.6.2 VTEMP Capacitive Loads
        3. 7.3.6.3 VTEMP Voltage Shift
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 ADC Input Considerations
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Selection of RSENSE Resistors
      3. 8.2.3 Application Curves
      4. 8.2.4 Grounding of the TRIP TEST Pin
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Temperature Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • PW|8
    • MPDS568
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • snis191a_oa
  • snis191a_pm
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DATA SHEET

LM57-Q1 Resistor-Programmable Temperature Switch and Analog Temperature Sensor

1 Features

  • Qualified for Automotive Applications, for Commercial Device See LM57 Data Sheet
  • AEC-Q100 Qualified with the Following Results:
    • Temperature Grade 0 Extended: −50°C to +160°C with Excursions up to 170°C Operating Temperature Range
    • Temperature Grade 0: −50°C to +150°C Operating Temperature Range
    • Temperature Grade 1: −50°C to +125°C Operating Temperature Range
    • HBM ESD Component Classification Level 2
    • CDM ESD Component Classification Level C5
  • Trip Temperature Set by External Resistors with
    Accuracy of ±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 160°C
  • Very Linear Analog VTEMP Temp Sensor Output
    with ±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

  • Automotive
  • Down Hole and Avionics

3 Description

The LM57-Q1 device is a precision, dual-output, temperature switch with analog temperature sensor output for wide temperature applications such as automotive grade. The trip temperature (TTRIP) is selected from 256 possible values in the range of –40°C to 160°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-Q1.

Device Information (1)(2)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM57 -Q1 TSSOP (8) 3.00 mm × 6.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.
  2. For device comparison see Device Comparison Table.

LM57-Q1 Overtemperature Alarm

LM57-Q1 30080576.gif

Temperature Transfer Function

LM57-Q1 C101_SNIS191.png

4 Device Comparison Table

ORDER NUMBER PACKAGE GRADE (TEMP RANGE) VTEMP ACCURACY TRIP POINT ACCURACY HYSTERESIS
LM57BISD-5, LM57BISDX-5(1) WSON/SD/NGR/DFN (8) Commercial (-50°C to 150°C) ±0.8°C ±1.5°C 5°C
LM57BISD-10, LM57BISDX-10(1) WSON/SD/NGR/DFN (8) Commercial (-50°C to 150°C) ±0.8°C ±1.5°C 10°C
LM57CISD-5, LM57CISD-5(1) WSON/SD/NGR/DFN (8) Commercial (-50°C to 150°C) ±1.3°C ±2.3°C 5°C
LM57CISD-10, LM57CISDX-10(1) WSON/SD/NGR/DFN (8) Commercial (-50°C to 150°C) ±1.3°C ±2.3°C 10°C
LM57FPW, LM57FPWR(1) PW/TSSOP (8) Commercial (-50°C to 150°C) ±1.3°C ±2.3°C 5°C
LM57TPW, LM57TPWR(1) PW/TSSOP (8) Commercial (-50°C to 150°C) ±1.3°C ±2.3°C 10°C
LM57FSPWQ1, LM57FSPWRQ1 PW/TSSOP (8) Automotive Grade 0 Extended (-50°C to 160°C) ±1.3°C ±2.3°C 5°C
LM57TSPWQ1, LM57TSPWRQ1 PW/TSSOP (8) Automotive Grade 0 Extended (-50°C to 160°C) ±1.3°C ±2.3°C 10°C
LM57FEPWQ1, LM57FEPWRQ1 PW/TSSOP (8) Automotive Grade 0 Standard (-50°C to 150°C) ±1.3°C ±2.3°C 5°C
LM57TEPWQ1, LM57TEPWRQ1 PW/TSSOP (8) Automotive Grade 0 Standard (-50°C to 150°C) ±1.3°C ±2.3°C 10°C
LM57FQPWQ1, LM57FQPWRQ1 PW/TSSOP (8) Automotive Grade 1 Standard (-50°C to 125°C) ±1.3°C ±2.3°C 5°C
LM57TQPWQ1, LM57TQPWRQ1 PW/TSSOP (8) Automotive Grade 1 Standard (-50°C to 125°C) ±1.3°C ±2.3°C 10°C
(1) For Commercial grade device complete datasheet see LM57.

5 Pin Configuration and Functions

TSSOP/PW Package
8-Pin
Top View
LM57-Q1 30080501.gif

Pin Functions

PIN TYPE EQUIVALENT CIRCUIT DESCRIPTION
NAME NO.
GND 1 Ground — Power supply ground
SENSE1 2 — LM57-Q1 SNIS188_RSENSE_ESD.gif Trip-point resistor sense. One of two sense pins which selects the temperature at which TOVER and TOVER will assert.
SENSE2 3 — LM57-Q1 SNIS188_RSENSE_ESD.gif Trip-point resistor sense. One of two sense pins which selects the temperature at which TOVER and TOVER will assert.
VDD 4 Power Supply voltage
TRIP
TEST		 5 Digital Input LM57-Q1 30080538.gif TRIP TEST pin. Active High input.
If TRIP TEST = 0 (default), then the VTEMP output has the analog temperature sensor output voltage.
If TRIP TEST = 1, then TOVER and TOVER outputs are asserted and VTEMP = VTRIP, the temperature trip voltage.
Tie this pin to ground if not used.
TOVER 6 Digital Output LM57-Q1 30080521.gif Overtemperature switch output
Active low, open-drain (see LM57-Q1 VTEMP Voltage-to-Temperature Equations regarding required pullup resistor.)
Asserted when the measured temperature exceeds the Trip Point Temperature or if TRIP TEST = 1
This pin may be left open if not used.
TOVER 7 Digital Output LM57-Q1 30080520.gif Overtemperature switch output
Active high, push-pull
Asserted when the measured temperature exceeds the trip point temperature or if TRIP TEST = 1
This pin may be left open if not used.
VTEMP 8 Analog Output LM57-Q1 30080539.gif VTEMP analog voltage output
If TRIP TEST = 0, then VTEMP = VTS, temperature sensor output voltage
If TRIP TEST = 1, then VTEMP = VTRIP, temperature trip voltage
This pin may be left open if not used.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)(2)
MIN MAX UNIT
Supply voltage −0.3 6 V
Voltage at TOVER −0.3 6 V
Voltage at TOVER , VTEMP, TRIP-TEST, SENSE1, and SENSE2 −0.3 (VDD + 0.3 V) V
Current at any pin 5 mA
Storage temperature for LM57FSPWQ1 and LM57TSPWQ1 −65 175 °C
Storage temperature for all LM57-Q1 except LM57FSPWQ1 and LM57TSPWQ1 −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Soldering process must comply with Reflow Temperature Profile specifications. Refer to www.ti.com/packaging.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per AEC Q100-002 (1) ±2000 V
Charged-device model (CDM), per AEC Q100-011 ±750
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

6.3 Recommended Operating Conditions

MIN NOM MAX UNIT
FOR ALL PARTS GRADE 0 AND GRADE 1 EXCEPT GRADE 0 EXTENDED (LM57FSPWQ1 and LM57TSPWQ1)
Supply voltage 2.4 5.5 V
Free air temperature range (TMIN ≤ TA ≤ TMAX) LM57FEPWQ1, and LM57TEPWQ1 −50 150 °C
LM57FQPWQ1, LM57TQPWQ1 -50 125 °C
GRADE 0 EXTENDED (LM57FSPWQ1 AND LM57TSPWQ1)
Supply voltage 2.4 5.5 V
Free air temperature range (TMIN ≤ TA ≤ TMAX) Temperature Profile for LM57-Q1 Automotive Grade 0 Extended High Temperature Operational Life Test (HTOL) - Hours of Operation: (1) −50 170 °C
   1700 hours at TJ = TC = 160°C
   10 hours at TJ = TC = 170°C
(1) Except for HTOL testing, which was conducted as described, all other testing was to AEC-Q100 Grade 0 flow. Full details on reliability testing are available upon request.

6.4 Thermal Information

THERMAL METRIC (1) LM57-Q1 UNIT
PW (TSSOP)
8 PINS
RθJA Junction-to-ambient thermal resistance 183 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 66 °C/W
RθJB Junction-to-board thermal resistance 111 °C/W
ψJT Junction-to-top characterization parameter 8 °C/W
ψJB Junction-to-board characterization parameter 110 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance — °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

Unless otherwise noted, these specifications apply for VDD = 2.4 to 5.5 V and over free air temperature range. These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in Table 1.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
TRIP POINT ACCURACY FOR ALL LM57-Q1 EXCEPT LM57FSPWQ1 AND LM57TSPWQ1
Trip Point Accuracy
(Includes 1% set-resistor tolerance) 		J2 TA = −41°C to 52°C VDD = 2.4 V to 5.5 V ±2.3 °C
J3 TA = 52°C to 97°C VDD = 2.4 V to 5.5 V ±2.3 °C
J4 TA = 97°C to 119°C VDD = 2.4 V to 5.5 V ±2.3 °C
J5 TA = 119°C to free air temperature max VDD = 2.4 V to 5.5 V ±2.3 °C
TRIP POINT ACCURACY FOR LM57-Q1 AUTOMOTIVE GRADE 0 EXTENDED (LM57FSPWQ1 and LM57TSPWQ1)
Trip point accuracy
(Includes 1% set-resistor tolerance) 		J2 TA = −41°C to 52°C VDD = 2.4 V to 5.5 V ±2.3 °C
J3 TA = 52°C to 97°C
J4 TA = 97°C to 119°C
J5 TA = 119°C to 160°C
J5 TA = 150°C to 160°C VDD = 2.4 V to 5.5 V ±2.5
VTEMP ANALOG TEMPERATURE SENSOR OUTPUT ACCURACY FOR ALL LM57-Q1 EXCEPT LM57FSPWQ1 and LM57TSPWQ1
VTEMP Accuracy
(These stated accuracy limits are with reference to the values in Table 1, LM57-Q1 VTEMP Temperature-to-Voltage.) 		J2 TA = −50°C to free air temperature max VDD = 2.4 V to 5.5 V ±1.3 °C
J3 TA = −50°C to free air temperature max VDD = 2.4 V to 5.5 V ±1.3 °C
J4 TA = 20°C to 50°C VDD = 2.4 V to 5.5 V ±1.3 °C
TA = 0°C to free air temperature max VDD = 2.7 V to 5.5 V ±1.3
TA = −50°C to 0°C VDD = 3.1 V to 5.5 V ±1.3
J5 TA = 60°C to free air temperature max VDD = 2.4 V to 5.5 V ±1.3 °C
TA = 20°C to 50°C VDD = 2.9 V to 5.5 V ±1.3
TA = 0°C to free air temperature max VDD = 3.2 V to 5.5 V ±1.3
TA = −50°C to 0°C VDD = 4 V to 5.5 V ±1.3
VTEMP ANALOG TEMPERATURE SENSOR OUTPUT ACCURACY FOR LM57-Q1 AUTOMOTIVE GRADE 0 EXTENDED (LM57FSPWQ1 and LM57TSPWQ1)
VTEMP accuracy
(These stated accuracy limits are with reference to the values in Table 1, LM57-Q1 VTEMP temperature-to-voltage.) 		J2 TA = 150°C to 160°C VDD = 2.4 V to 5.5 V ±1.5 °C
TA = –50°C to 150°C ±1.3
J3 TA = 150°C to 160°C VDD = 2.4 V to 5.5 V ±1.5 °C
TA = –50°C to 150°C ±1.3
J4 TA = 20°C to 50°C VDD = 2.4 V to 5.5 V ±1.3 °C
TA = 0°C to 150°C VDD = 2.7 V to 5.5 V ±1.3
TA = 150°C to 160°C ±1.5
TA = –50°C to 0°C VDD = 3.1 V to 5.5 V ±1.3
J5 TA = 150°C to 160°C VDD = 2.4 V to 5.5 V ±1.5 °C
TA = 60°C to 150°C ±1.3
TA = 20°C to 50°C VDD = 2.9 V to 5.5 V ±1.3
TA = 0°C to 150°C VDD = 3.2 V to 5.5 V ±1.3
TA = –50°C to 0°C VDD = 4 V to 5.5 V ±1.3
OTHER TEMPERATURE SENSOR SPECIFICATIONS
VTEMP sensor gain J2: −50°C to 52°C −5.166 mV/°C
J3: 52°C to 97°C −7.752
J4: 97°C to 119°C −10.339
J5: 119°C to 160°C −12.924
Line regulation DC: supply-to-VTEMP(1) Temp = 90°C 0.18 mV
58 μV/V
−84 dB
Load regulation: VTEMP output (4) Source ≤ 240 µA, (VDD – VTEMP) ≥ 200 mV; TA = −50°C to 150°C −1 mV
Sink ≤ 300 µA, VTEMP ≥ 360 mV; TA = −50°C to 150°C 1
Source or sink = 100 µA; TA = −50°C to 150°C 1 Ω
Maximum Load capacitance: VTEMP output No output series resistor required; (See VTEMP Capacitive Loads) 1100 pF
IS Supply current: quiescent (2) for all LM57-Q1 for TA ≤ 150°C 24 28 µA
TA = 150°C to 160°C for LM57FSPWQ1 and LM57TSPWQ1 24 29 µA
TA = 170°C for LM57FSPWQ1 and LM57TSPWQ1 26 µA
TRIP-TEST INPUT
VIH Logic 1 threshold voltage VDD – 0.5 V
VIL Logic 0 threshold voltage 0.5 V
IIH Logic 1 input current 1.4 3 µA
IIL Logic 0 input leakage current (3) TA = −50°C to 150°C 0.001 1 µA
TOVER (PUSH-PULL, ACTIVE-HIGH) OUTPUT
VOH Logic 1 push-pull output voltage Source ≤ 600 µA VDD – 0.2 V
Source ≤ 1.2 mA VDD – 0.45
VOL Logic 0 output voltage Sink ≤ 600 µA 0.2 V
Sink ≤ 1.2 mA 0.45
TOVER (OPEN-DRAIN, ACTIVE-LOW) OUTPUT
VOL Logic 0 output voltage Sink ≤ 600 µA 0.2 V
Sink ≤1.2 mA 0.45
IOH Logic 1 output leakage current (3) Temperature = 30°C; 0.001 1 µA
HYSTERESIS
THYST Hysteresis temperature 5°C hysteresis option (all LM57F for TA ≤ 150°C) 4.7 5 5.4 °C
10°C hysteresis option (all LM57T for TA ≤ 150°C) 9.6 10 10.6 °C
5°C hysteresis option (LM57FSPWQ1); TA = 150°C to 160°C 4.6 5 5.4 °C
10°C hysteresis option (LM57TSPWQ1); TA = 150°C to 160°C 9.4 10 10.6 °C
(1) Line regulation (DC) is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest supply voltage. The typical DC line regulation specification does not include the output voltage shift discussed in VTEMP Voltage Shift.
(2) Supply current refers to the quiescent current of the LM57-Q1 only and does not include any load current
(3) This current is leakage current only and is therefore highest at high temperatures. Prototype test indicate that the leakage is well below 1 μA over the full temperature range. This 1 μA specification reflects the limitations of measuring leakage at room temperature. For this reason only, the leakage current is not specified at a lower value.
(4) Source currents are flowing out of the LM57-Q1. Sink currents are flowing into the LM57-Q1. Load Regulation is calculated by measuring VTEMP at 0 μA and subtracting the value with the conditions specified.

6.6 Switching Characteristics

Unless otherwise noted, these specifications apply for VDD = 2.4 to 5.5 V over the free air temperature range.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tEN Maximum time from power on to digital output enabled 1.5 ms
tVTEMP Maximum time from power on to analog temperature (VTEMP) valid 1.5 ms
LM57-Q1 30080550.gifFigure 1. Definition of tEN
LM57-Q1 30080551.gifFigure 2. Definition of tVTEMP

6.7 Typical Characteristics

LM57-Q1 30080569.gif
Figure 3. Supply Current vs Supply Voltage
LM57-Q1 30080567.gif
Figure 5. Load Regulation: Change In VTEMP vs Source Current Overhead Is Vdd-Vtemp
LM57-Q1 30080572.gif
Figure 7. Line Regulation: VTEMP vs Supply Voltage
LM57-Q1 30080525.gif
Figure 9. Start-Up Response
LM57-Q1 C102_SNIS191.png
Conditions: J2, VDD=5V
Figure 11. J2 Accuracy Specification Over Temperature
LM57-Q1 30080570.gif
Figure 4. Supply Current vs Temperature
LM57-Q1 30080568.gif
Figure 6. Load Regulation: Change In VTEMP vs Sink Current
LM57-Q1 30080526.gif
Figure 8. Line Regulation: Hysteresis vs Supply Voltage 30°C
LM57-Q1 30080527.gif
Figure 10. Hysteresis vs Temperature

 
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