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PDF SMT172 Data sheet ( Hoja de datos )
| Número de pieza | SMT172 | |
| Descripción | High Accuracy Temperature Sensor | |
| Fabricantes | SMARTEC | |
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DATASHEET
SMT172
last update
juni 21, 2016
reference
page
1/9
Features and Highlights
World’s most energy efficient temperature sensor
0.36µJ/measurement (TA=25°C, 3.3V)
Wide temperature range: -45°C to 130°C
Wide supply voltage range: 2.7V to 5.5V
High accuracy: ±0.25°C (-10°C to 100°C TO18)
±0.1°C (-20°C to 60°C, TO18)
Extreme low noise: 0.0002°C
Ultra-low current (60µA active or 220nA average)
Excellent long term stability
Direct interface with Microcontroller (MCU)
Wide range of package options
Application
Ultra-low power applications: wearable electronics, wireless sensor networks
Medical applications: body temperature monitoring
Instrumentation: (Bio)chemical analysis, precision equipment
Environmental monitoring (indoor/outdoor)
Industrial applications: process monitoring/controlling
Introduction
The SMT172 is an ultra-low power, high-precision temperature sensor that combines the ease of use with the
world’s leading performance over a wide temperature range. Using the most recent advances in the silicon
temperature sensing technology, the SMT172 has applied some really sophisticated IC design techniques as
well as high-precision calibration methods, to achieve an absolute inaccuracy of less than ±0.1°C in the range
of -20°C to 60°C
The SMT172 operates with a supply voltage from 2.7V to 5.5V. The typical active current of only 60µA, the
high speed conversion over 4000 outputs per second (at room temperature) and an extremely low noise
makes this sensor the most energy efficient temperature sensor in the world (0.36µJ/measurement).
The SMT172 has a pulse width modulated (PWM) output signal, where the duty cycle is proportional to the
measured temperature. This makes it possible that the sensor can directly interface to a MCU without using
an Analog-to-Digital Converter (ADC). Today, the hardware Timer in a MCU to read our PWM signal has
become available almost universally, fast in speed and low in cost. Therefore, it is extremely easy for any user
to get started with this sensor and achieve a very quick time to market.
1 page  
DATASHEET
SMT172
last update
juni 21, 2016
reference
page
5/9
Sensor noise
Each semiconductor product generates noise, also the SMT172 sensor. The lower limit of the noise is
determined by the flicker noise of the sensor, where further averaging will no longer reduce it. So the
measured noise of the sensor mainly depends on the measurement time. The noise of the sensor is about
0.002°C when measuring over 3.6ms (8 periods, 5V). When measuring over about 1s the sensor noise is
reduced to <0.0002°C.
Package induced error
When applying high stress package materials, extra errors will occur and therefore system designers should
be aware of this effect. The TO-18 package has the minimum package induced errors. All other packages can
have a slightly bigger error on top of the error in the specifications but based on the recent measurements on
the plastic versions TO92, SOIC, SOT223 and TO220 the error will be less than ±0.35°C (-10°C to 100°C)
and ±1°C over the temperature range of -45°C to 130°C.
Long-term drift
This drift strongly depends on the operating condition. The measured hysteresis in a thermal cycle (TO-18
packaged samples) is less than ±0.02°C over the whole temperature range. Even at extreme condition (TO-18
samples heated up to 200°C for 48 hours), the drift is still less than ±0.05°C over the whole temperature range
(-45°C to 130°C). At room temperature (22ºC), the output drift is less than 5.8mK over 365 days.
Typical Performance Characteristics
SMT172
Maximum Error Limit
SMT172
Maximum Error Limit
Accuracy vs. Temperature (TO18 VCC=5V)
Normalized Error vs. Supply Voltage
Supply Current vs. Temperature
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