描述 Description

The SMT172-92 is an ultra-low power, high precision temperature sensor in 3 pin TO-220 package. It combines ease of use with world's leading performance over wide temperature range. Using most recent advances in 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 range of -20°C to 60°C. The high speed conversion over 4000 outputs per second (at room temperature) and an extremely low noise makes this sensor most energy efficient temperature sensor in world (0.36μJ/measurement). The SMT172 has PWM output signal where duty cycle is proportional to measured temperature. This makes it possible that sensor can directly interface to a MCU without using an ADC.

特性 Features

·Wide temperature range from -45°C to 130°C
·Wide supply voltage range from 2.7V to 5.5V
·Extreme low noise of 0.0002°C
·Average current of 220nA at TA = 25°C, VCC = 3.3V (one measurement per second)
·Excellent long term stability and direct interface with microcontroller (MCU)
·Active current of 60μA at TA = 25°C, VCC = 3.3V (no load at the output pin)
·Power down current of 0μA when controlling with VCC pin
·Accuracy ±0.25°C (-20°C to 80°C), ±1°C (-45°C to 130°C) and 0.8°C (-45°C to 130°C)
·Output duty cycle of 0.93 at -45°C to 130°C
·Output frequency of 7KHz and output impedance of 100 ohm

應(yīng)用 Application

傳感與儀器, 醫(yī)用, 工業(yè)