Support software
LMT70
0.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin
Data sheet
LMT70
- 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.
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Technical documentation
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View all 8 | 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 | PDF | HTML | 07 Apr 2020 | |
| 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 | ||
| Technical article | Real-time temperature sensing with dual-mode connectivity | PDF | HTML | 03 Nov 2016 | |
| Technical article | Tips and tricks for human body temperature measurement with analog temperature sen | PDF | HTML | 08 Sep 2015 |
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 (...)
User guide: PDF
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 (...)
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 (...)
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 (...)
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 (...)
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 (...)
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFQ) | 4 | Ultra Librarian |
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