LMT70--temperature sensor

The LMT70 is an ultra-small, high-precision, low-power complementary metal-oxide semiconductor (CMOS) analog temperature sensor with an output enable pin. The LMT70 is suitable for nearly all high-precision, low-power, cost-effective temperature sensing applications, such as Internet of Things (IoT) sensor nodes, medical thermometers, high-precision instrumentation and battery-operated equipment. The LMT70 is also an ideal replacement for RTDs and high-precision NTC/PTC thermistors.

Multiple LMT70s can use the output enable pin to share an analog-to-digital converter (ADC) channel, simplifying the ADC calibration process and reducing the overall cost of precision temperature sensing systems. The LMT70 also features a linear low-impedance output that enables seamless interfacing with off-the-shelf microcontrollers (MCUs)/ADCs. The LMT70's heat dissipation is less than 36µW, and this ultra-low self-heating allows it to maintain high accuracy over a wide temperature range.

LMT70A has excellent temperature matching performance. The temperature of two adjacent LMT70A taken out from the same tape and reel can differ by up to 0.1°C. Therefore, the LMT70A is an ideal solution for energy metering applications where heat transfer needs to be calculated.

• 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 (maximum) from 90°C to 110°C
  • ±0.36°C (max) from -55°C to 150°C
• Wide temperature range: −55°C to 150°C
• Temperature matching of two adjacent LMT70A in tape and reel packaging: 0.1°C (maximum) at 30°C
• Ultra-linear analog temperature sensor with output enable pin
• Negative Temperature Coefficient (NTC) Output Slope: -5.19mV/°C
•  Output on/off switch when R DS on < 80Ω
• Wide power range: 2.0V to 5.5V
• Low supply current: 9.2µA (typ) 12µA (maximum)
• Ultra-small 0.88mm x 0.88mm 4-bump WLCSP (DSBGA) package

application

• Internet of Things (IoT) sensor nodes
• Industrial Resistive Temperature Detector (RTD) (Class AA) or Precision NTC/Positive Temperature Coefficient (PTC) Thermistor Replacement
• Medical/Fitness Equipment
• medical thermometer
• human body temperature monitor
• Metering temperature compensation