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LMT70

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0.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin

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Data sheet

LMT70

ACTIVE
Data sheet Order now

Product details

Local sensor accuracy (Max) (+/- C) 0.1 Operating temperature range (C) -55 to 150 Supply voltage (Min) (V) 2 Supply voltage (Max) (V) 5.5 Supply current (Max) (uA) 12 Interface type Analog output Sensor gain (mV/Deg C) -5.19 Rating Catalog
Local sensor accuracy (Max) (+/- C) 0.1 Operating temperature range (C) -55 to 150 Supply voltage (Min) (V) 2 Supply voltage (Max) (V) 5.5 Supply current (Max) (uA) 12 Interface type Analog output Sensor gain (mV/Deg C) -5.19 Rating Catalog
DSBGA (YFQ) 4 0 mm² .924 x .924
  • Accuracy:
    • ±0.05°C (typ) or ±0.13°C (max) from 20°C to 42°C
    • ±0.2°C (max) from -20°C to 90°C
    • ±0.23°C (max) from 90°C to 110°C
    • ±0.36°C (max) from -55°C to 150°C
  • Wide Temperature Range: −55°C to 150°C
  • Matching of Two Adjacent LMT70A on Tape and Reel: 0.1°C (max) at 30°C
  • Very Linear Analog Temperature Sensor with Output Enable Pin
  • NTC Output Slope: -5.19 mV/°C
  • Output On/Off Switch with RDS on < 80 Ω
  • Wide Power Supply Range: 2.0 V to 5.5 V
  • Low Power Supply Current: 9.2 µA (typ)12 µA (max)
  • Ultra Small 0.88 mm by 0.88 mm 4-bump WLCSP (DSBGA) Package

All trademarks are the property of their respective owners.

  • Accuracy:
    • ±0.05°C (typ) or ±0.13°C (max) from 20°C to 42°C
    • ±0.2°C (max) from -20°C to 90°C
    • ±0.23°C (max) from 90°C to 110°C
    • ±0.36°C (max) from -55°C to 150°C
  • Wide Temperature Range: −55°C to 150°C
  • Matching of Two Adjacent LMT70A on Tape and Reel: 0.1°C (max) at 30°C
  • Very Linear Analog Temperature Sensor with Output Enable Pin
  • NTC Output Slope: -5.19 mV/°C
  • Output On/Off Switch with RDS on < 80 Ω
  • Wide Power Supply Range: 2.0 V to 5.5 V
  • Low Power Supply Current: 9.2 µA (typ)12 µA (max)
  • Ultra Small 0.88 mm by 0.88 mm 4-bump WLCSP (DSBGA) Package

All trademarks are the property of their respective owners.

The LMT70 is an ultra-small, high-precision, low-power CMOS analog temperature sensor with an output enable pin. Applications for the LMT70 include virtually any type of temperature sensing where cost-effective, high precision and low-power are required, such as Internet of Things (IoT) sensor nodes, medical thermometers, high-precision instrumentation and battery powered devices. The LMT70 is also a great replacement for RTD and precision NTC/PTC thermistors.

Its output enable pin allows multiple LMT70s to share one ADC channel, thus simplifying ADC calibration and reducing the overall system cost for precision temperature sensing. The LMT70 also has a linear and low impedance output allowing seamless interface to an off-the-shelf MCU/ADC. Dissipating less than 36µW, the LMT70 has ultra-low self-heating supporting its high-precision over a wide temperature range.

The LMT70A provides unparalleled temperature matching performance of 0.1°C (max) for two adjacent LMT70A's picked from the same tape and reel. Therefore, the LMT70A is an ideal solution for energy metering applications requiring heat transfer calculations.

The LMT70 is an ultra-small, high-precision, low-power CMOS analog temperature sensor with an output enable pin. Applications for the LMT70 include virtually any type of temperature sensing where cost-effective, high precision and low-power are required, such as Internet of Things (IoT) sensor nodes, medical thermometers, high-precision instrumentation and battery powered devices. The LMT70 is also a great replacement for RTD and precision NTC/PTC thermistors.

Its output enable pin allows multiple LMT70s to share one ADC channel, thus simplifying ADC calibration and reducing the overall system cost for precision temperature sensing. The LMT70 also has a linear and low impedance output allowing seamless interface to an off-the-shelf MCU/ADC. Dissipating less than 36µW, the LMT70 has ultra-low self-heating supporting its high-precision over a wide temperature range.

The LMT70A provides unparalleled temperature matching performance of 0.1°C (max) for two adjacent LMT70A's picked from the same tape and reel. Therefore, the LMT70A is an ideal solution for energy metering applications requiring heat transfer calculations.
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Technical documentation

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Type Title Date
* Data sheet LMT70, LMT70A ±0.05°C Precision Analog Temperature Sensor, RTD and Precision NTC Thermistor IC datasheet (Rev. A) PDF | HTML 11 May 2015
Application note Ultra-Small, Precision Analog Temperature Sensor Measurement With ADC (Rev. A) 24 Aug 2021
Technical article How to design an infrared thermometer quickly 07 Apr 2020
Technical article How to choose the right thermistor for your temperature sensing application 13 Feb 2020
Technical article How to enable thermal safety for automotive infotainment and cluster systems 15 Oct 2019
Technical article Driving industrial innovation with small-size sensors 12 Sep 2019
Application note Temperature sensors: PCB guidelines for surface mount devices (Rev. A) 18 Jan 2019
Application note Wearable Temp-Sensing Layout Considerations Optimized for Thermal Response (Rev. B) 23 Oct 2018
Application note Design Considerations for Measuring Ambient Air Temperature (Rev. B) 10 Sep 2018

Design & development

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

Evaluation board

LMT70EVM — LMT70 Evaluation Module Precise Analog Output Temperature Sensor with Output Enable

The LMT70EVM allows users to evaluate the performance of the LMT70 temperature sensor. The EVM comes in a USB stick form factor package with an onboard MSP430F5528 microcontroller that interfaces with both the USB port and the LMT70 device. The EVM also comes with perforated slots that the user can (...)

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Support software

LMT70EVM Installer v1.4.0.0 (Rev. B)

SNIC010B.ZIP (166291 KB)
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Simulation model

LMT70 TINA-TI Spice Model

SNIM007.ZIP (9 KB) - TINA-TI Spice Model
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Simulation model

LMT70 TINA-TI Reference Design

SNIM008.TSC (1774 KB) - TINA-TI Reference Design
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Reference designs

TIDA-01576 — High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC

This reference design accurately measures 16-channel AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range. This range covers protection and measurement requirements (including sampling requirements as per IEC 61850-9-2), which simplifies system design and improves (...)
Schematic: PDF
Reference designs

TIDA-010019 — RTD replacement for cold junction compensation reference design in a temperature sensor

Temperature-sensing applications that use a thermocouple (TC) require an accurate local temperature sensor to achieve high accuracy. Solutions for design challenges such as cold-junction compensation (CJC) or including an ultra-low power TC analog front-end are highlighted and addressed in this (...)
Schematic: PDF
Reference designs

TIDA-01214 — Isolated, High-Accuracy Analog Input Module Reference Design Using 16-Bit ADC and Digital Isolator

This reference design provides accurate measurements of AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range, covering protection and measurement range (including sampling requirements of IEC 61850-9-2), simplifying system design and improving trip time (...)
Schematic: PDF
Reference designs

TIDA-00721 — Passive NFC Temperature Patch Reference Design

TIDA-00721 is a complete reference design for accurate temperature measurements using a passive NFC tag in a flexible patch form factor. The system offers temperature readings from tag to a NFC receiver such as a NFC enabled smartphone. The high accuracy temperature sensor (LMT70) is interfaced (...)
Schematic: PDF
Reference designs

TIDA-00824 — Human Skin Temperature Sensing for Wearable Applications Reference Design

TIDA-00824 features LMT70 analog temperature sensor for measuring human skin temperature. This reference design shows how to mechanically mount the temperature sensor for best thermal conductivity. Signal path considerations on how to achieve greater than 0.1°C accuracy is also discussed in (...)
Schematic: PDF
Reference designs

TIDA-00452 — Temperature Sensor for Wearable Devices Reference Design

This reference design demonstrates temperature sensing aimed at the wearables market. LMT70 temperature sensor is ideal for wearable devices due to its 0.13°C temperature accuracy at human body temperatures. Its small form WCSP package allows it to be heated up quickly and have a fast thermal (...)
Schematic: PDF
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DSBGA (YFQ) 4 View options

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