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SMT172 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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SMT172 Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 9 page DATASHEET SMT172 last update maart 20, 2017 reference V14 page 3 Absolute Maximum Rating TA=25°C. All voltages are referenced to GND, unless otherwise noted. Power supply voltage -0.5V to 7V Output pin load 50mA Operating temperature range -55°C 1 to 135°C Storage temperature range -60°C to 150°C ESD protection (HBM) 2000V Junction temperature 200°C Soldering temperature (SOIC, SOT) 260°C (10s) 1: For the accuracy over the temperature range from -55°C to -45°C and from 130°C to 135°C, contact Smartec BV. Output Signal According to tradition, the Smartec temperature sensors have a duty cycle (PWM) output that can be directly interfaced with a microcontroller without the use of extra components. The output is a square wave with a well-defined temperature-dependent duty cycle. In general, the duty cycle of the output signal is defined by a linear equation: = . + . × where DC = Valid Duty Cycle T = Temperature in °C A simple calculation shows that, i.e. at 0°C, DC=0.32 (32%); at 130°C, DC=0.931 (93.1%). The temperature is derived from the measured duty cycle by: = . . = 212.77 × − 68.085 The frequency of the sensor output varies with the temperature and the supply voltage, but it does not contain temperature information. Only the duty cycle contains temperature information in accordance to the formula given above. A higher accuracy can be achieved when a second order formula is used, an accuracy of ±0.1°C can be achieved in the range of -20°C to 60°C. Valid Duty Cycle A valid duty cycle in equation (1) is defined as the average of individual duty cycles from 8 consequent output periods. This is due to the internal working principle of the SMT172 sensor. In order to eliminate the error caused by component mismatching, DEM (Dynamic Element Matching) has been applied in SMT172. A complete DEM cycle consists 8 periods. There might be large variation between each individual period, and this variation changes from sensor to sensor, but the averaged value of 8 consequent periods (valid duty cycle) is very stable and precise. |
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