SMT-160-30-220 SMARTEC, SMT-160-30-220 Datasheet - Page 4

• Manufacturer Part Number: SMT-160-30-220
• Description: IC, TEMP SENSOR, TO-220-3, 160
• Manufacturer: SMARTEC

Specifications of SMT-160-30-220

• Ic Output Type: Voltage
• Sensing Accuracy Range: ± 1.7°C
• Supply Current: 200µA
• Supply Voltage Range: 4.75V To 7.2V
• Sensor Case Style: TO-220
• No. Of Pins: 3
• Operating Temperature Max: 130°C
• Operating: RoHS Compliant
• Temperature Sensing Range: -45°C To +130°C
• Rohs Compliant: Yes

SMT16030
Version 7/2005
SMARTEC B.V, Delpratsingel 26
4811 AP Breda, The Netherlands
Product description
The SMT160-30 is a three terminal integrated temperature sensor, with a duty-cycle output.
Two terminals are used for the power supply of 5 Volts and the third terminal carries the
output signal. A duty cycle modulated output is used because this output is interpretable by a
micro-processor without A-D converter, while the analogue information is still available.
The SMT160-30 (TO18 model) has an overall accuracy of 0.7 °C in the range from -30 C to
+100 °C and an accuracy of 1.2 °C from -45 to +130 °C. This makes the sensor especially
useful in all applications where "human" (climate control, food processing etc.) conditions are
to be controlled. Due to its very high resolution (< 0.005K) this sensor is especially suited for
applications where very accurate measurements are needed.
The CMOS output of the sensor can handle cable length up to 20 meters. This makes the
SMT160-30 very useful in remote sensing and control applications.
Understanding the specifications
It is important to understand the meaning of the various specifications and their effects on
accuracy. The SMT160-30 is basically a bipolar temperature sensor, with accurate electronics
to convert the sensor signal into a duty cycle. During production the devices are calibrated.
The output signal
The output is a square wave with a well-defined temperature-dependent duty cycle. The duty
cycle of the output signal is linearly related to the temperature according to the equation:
A simple calculation shows that - for instance- at 0 °C:
D.C.= 0.320 or 32.0 % and at 130 °C
D.C.= 0.931 or 93.1 %
cycle contains temperature information in accordance to the formula given above. The
output signal may show low frequency jitter or drift. Therefore most oscilloscopes and
counters are not suited for verifying the accuracy of these sensors. The temperature
information contained in the duty-cycle value, however, is guaranteed to be accurate
within the values specified for each model (housing).
In the output frequency of the sensor there is no temperature information, only the duty
D.C. = duty cycle
t = Temperature in °C
D.C. = 0.320+0.00470*t
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