Temperature sensor
Specification sheet
SMT 160-30
Contents
1.Introduction
page 3
2. Smart temperature sensor page 4
3. Pin-out and housing
page 6
4. Product discription
page 7
5. Specifications
page 8
6. Understanding the specifications
page 9
7. General operation
page 11
1. Introduction
The Smartec temperature sensor is a sophisticated full silicon temperature sensor with a
digital output. The one wire (duty cycle) output can be connected to all kind of micro-
controllers directly without the need of A/D conversion. The temperature range is
45 C to 150 C. The sensor is available in various housing like T018, T092, T0220
and for high volume production in SOIC.
2. Smart temperature sensor
Most important features
* No A-D converter necessary
* Absolute accuracy .7 C
* Linear output within .2 C
* Output fully digital interpretable
* Output fully analogue interpretable
* Calibrated on chip.
* TTL, CMOS compatible
* Temperature range 175 C (-45 to +130 C)
* Dir ectly connectable to data input of micro processor
* Easy multiplexing when using more sensors to one micro processor
* Low power consumption (< 1 mW)
Typical applications
* Heater systems
* Air conditioners
* Climatizing units
* Washing machines
* Overheating protection
* Appliances
Product highlights
1. The SMART TEMPERATURE SENSOR represents a significant totally new
development in transducer technology. Its new on-chip interface responds to the
progressively stringent demands of both the consumer and industrial electronics
sectors for a temperature sensor directly connectable to microprocessor input and
thus capable of direct and reliable communication with microprocessors.
2 The SMART TEMPERATURE SENSOR features a duty-cycle modulated square
waveoutput voltage with linear response to temperatures in the -45 C to +130 C
range to an accuracy of better than 1.2 C. In the range from -30 to +100 C the
linearity is better than 0.2 C. (TO18)
3.
The SMART TEMPERATURE SENSOR is calibrated during test and burn-in of
the chip. The integral modulator ensures that the sensor unit can communicate
effectively with low-cost processors without the need of (onboard) A-D convertors.
4 The SMART TEMPERATURE SENSOR combines digital output and on-chip
calibration to ensure major cost reductions and performance-related advantages.
5.
Direct connection of the sensor output to the microprocessor input reduces the
number of components and terminals to a minimum, cutting costs and boosting
reliability.
6.
In applications where more sensors are used, easy multiplexing can be obtained by
using more micro processor inputs or by using simple and cheap digital
multiplexers.
7. Since the sensor requires no subsequent calibration, optimal cost savings are
recorded both during manufacturing and in the course of after-sales servicing.
6.1 mm
Pin 1
1.27 mm
C
3. Pin-out and housing
SO8L housing
HEC housing
pin 1
Output
pin 2
+V
cc
pin 3
GND
TO-92 housing TO-18 housing TO-220 housing
bottom view
1 2 3
1
2
3
1 3 2
8.5 mm
2.5 mm
2
3
1
Pin 1 +V
Pin 7 GND
Pin 8 Out
C = 100 nF
(between Vcc and GND)
4. 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.
The C-mos 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.
Parameters
Value
unit
Supply voltage
4.75 - 7
V
Supply current
max 200
A
Short circuit protection
infinite (within supply
voltage range)
-
Operating temperature
range
-45 to +130
C
Storage temperature
-50 to +150
C
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