±0.1°C ultra-small, high-precision, low-power CMOS analog temperature sensor

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Product details

Parameters

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 open-in-new Find other Analog temperature sensors

Package | Pins | Size

DSBGA (YFQ) 4 0 mm² .924 x .924 open-in-new Find other Analog temperature sensors

Features

  • 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

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Description

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

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
49
Description

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 (...)

Features
  1. Evaluate LMT70 analog temperature sensor performance
  2. Perforated slots to break apart LMT70 device from MSP430 microcontroller
  3. EVM comes in a USB stick form factor
  4. Easy to use GUI
DEVELOPMENT KITS Download
document-generic User guide
Description

Step 1: Buy the BOOSTXL-CAPKEYPAD BoosterPack + CAPTIVATE-PGMR bundle
Step 2: Download and install the CapTIvate Design Center
Step 3: Follow the out-of-box experience instructions

The BOOSTXL-CAPKEYPAD is an easy-to-use evaluation module (EVM) for the MSP430FR2522 capacitive touch sensing (...)

Features
  • MSP430FR2522 MSP430 MCU with CapTIvate technology
  • 40-pin BoosterPack standard leveraging the LaunchPad ecosystem
  • CapTIvate programming header for interfacing with CAPTIVATE-PGMR
  • 12 touch button numeric keypad with proximity sensor
  • Integrated LP3943 LED driver for backlighting
DEVELOPMENT KITS Download
document-generic User guide
29.99
Description

To get started developing with this LaunchPad:
Step 1: Buy the MSP-EXP432P4111 LaunchPad
Step 2: Download the MSP432 SDK
Step 3: Complete the Out-of-Box experience and take the SimpleLink Academy trainings

The SimpleLink™ MSP432P4111 LaunchPad™ development kit enables you to develop (...)

Features
  • SimpleLInk MSP432P4111 32-bit Arm Cortex M4F MCU
  • 40 pin LaunchPad standard leveraging the BoosterPack ecosystem
  • On-Board XDS-110 emulator featuring EnergyTrace+ technology
  • On-Board Segmented LCD Display
  • 2 user buttons and 2 LEDs for user interaction

Software development

SUPPORT SOFTWARE Download
SNIC010B.ZIP (166291 KB)

Design tools & simulation

SIMULATION MODELS Download
SNIM007.ZIP (9 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNIM008.TSC (1774 KB) - TINA-TI Reference Design

Reference designs

REFERENCE DESIGNS Download
High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC
TIDA-01576 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
RTD replacement for cold junction compensation reference design in a temperature sensor
TIDA-010019 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated, High-Accuracy Analog Input Module Reference Design Using 16-Bit ADC and Digital Isolator
TIDA-01214 — 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 performance (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Passive NFC Temperature Patch Reference Design
TIDA-00721 — 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 with (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Human Skin Temperature Sensing for Wearable Applications Reference Design
TIDA-00824 TIDA-00824 features the LMT70 analog temperature sensor for measuring human skin temperature. This TI design features 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Temperature Sensor for Wearable Devices Reference Design
TIDA-00452 This TI Design is to demonstrate temperature sensoring aimed at the wearables market. The LMT70 temperature sensor is ideal for wearable devices due to its 0.13C temperature accuracy at human body temperatures. Its small form WCSP package allows it to be heated up quickly and thus have a fast (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 4 View options

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