SMT-160-30-220 SMARTEC, SMT-160-30-220 Datasheet - Page 7

• 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
NOTE:
The above mentioned error is NOT related to the intrinsic accuracy of the sensor. It just
tells us what happens to the accuracy (standard deviation) of the measurement of a
digital signal, when that signal is being sampled by a microcontroller.
About noise protection and how to prevent damage caused by a wrong
power supply polarity.
The Smartec SMT16030 is based on a free running oscillator. Periodic spikes on the power
supply line may make the oscillator synchronise, resulting in a false temperature reading. To
overcome this problem it is advised to put a filter in the power supply line of the sensor. It is
suggested to use a low pass RC filter as given below. An additional advantage also is the
power supply polarity protection of the sensor. The resistor of 220 Ohm limits the current
through the sensor to about 25 mA. At this current the sensor will survive a possible wrong
power supply polarity. The software can detect the presence of the output signal and therefore
a proper connection of the sensor. See below for a suggested diagram.
For more information about how to measure duty cycles by means of a microcontroller, please
refer to our application notes, available for download at our website WWW.SMARTEC.NL.
Power line noise filtering and polarity damage protection
+5 V.
Gnd
R = 220
C= 0.1 – 1 µF.
- 7 –
OUT
SMT16030
WWW.SMARTEC.NL
Tel: [phone]