The SMT172-TO223 is an ultra-low power, fully calibrated, high accuracy digital sensor. Using the most recent advances in silicon temperature sensing technology, the SMT172 has applied sophisticated IC design techniques and high-precision calibration methods, to achieve an overall accuracy of 0.1ºC in the range of -20ºC to 100ºC (-4ºF to 212ºF) and an accuracy of 0.4ºC from -45ºC to -20ºC and 100ºC to 135ºC. Measuring the SMT172 sensor requires only one digital pin.
* Overall accuracy 0.25ºC in the temperature range of -20ºC to 80ºC. (SMT172-223)
* For better accuracy us the SMT172-TO18 factory calibrated ± 0.04ºC at ~25ºC room temperature
* Accuracy of 0.8ºC from -45ºC to -20ºC and from 100ºC to 135ºC
* Noise less then 0.0001ºC
* Full temperature range from -45ºC to -135ºC (-49ºF to 275ºF)
* PWM output is easy to read by the a microprocessor.
* PWM signal is proportional to the temperature.
* Supply voltage 3V, 3.3V, 5V (Voltage range from +2.7V to +5.5V).
* 3 pin sensor, requires only one digital pin. ( Vcc, Gnd, PWM output ).
For quick evaluation of these sensors we have evaluation boards with USB interface. The SMTAS04USB can measure up to 4 x SMT172 temperature sensors and the SMTAS08USB can measures up to 8 sensors with an accuracy of 0.1ºC in the temperature range of -10ºC to 100ºC with a resolution of 0.0015 C. The board and sensors are powered from the USB port or an external DC power supply. The board uses an ARM Cortex-M3 STM32F103 to read the temperature sensors and output the measured temperature Celsius value and the PWM signal in HEX on the USB interface.
Click here to download the datasheet for this product.
