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SMT16030 DIGITAL TEMPERATURE SENSOR
November 14, 2010
reference
smt16030n
page
1/8
Features
•
•
•
•
•
•
•
•
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Absolute accuracy ± 0.7 °C
Linear output within 0.2 °C
Resolution better then 0.005 °C
Duty Cycle output
Calibrated on chip
TTL, CMOS compatible
Temperature range 175 °C (-45 to +130 °C)
Directly connectable to data input of microprocessor
Easy multiplexing of multiple sensors
Typical applications
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•
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Heater systems
Measuring instruments
Washing machines
Overheating protection
Appliances
Aerospace applications
Introduction
The Smartec temperature sensor is a sophisticated full silicon
temperature sensor with a digital output. The one wire output (duty-
cycle modulated) can be directly connected to all kinds of micro-
controllers without the need of A/D conversion. The temperature range
is –45 °C to 150 °C. The high resolution (< 0.005 °C) makes the sensor
useful for high precision applications. The sensor is available in
various housings like T018, T092, T0220 and for high volume production
in SOIC. Special housing can be manufactured on request.
Product highlights
The SMART TEMPERATURE SENSOR features a duty-cycle modulated square
wave output voltage with linear response to temperatures in the -45 °C
to +130 °C range. The absolute accuracy is better than 1.2 °C. In the
range from -30 to +100 °C absolute accuracy is better than 0.7 °C,
while the linearity is better than 0.2 °C (Model TO18).
The SMART TEMPERATURE SENSOR is calibrated during test and burn-in of
the chip. The integrated modulator ensures the sensor unit can
communicate effectively with low-cost microcontrollers without the need
of (onboard) A/D converters or an Xtal controlled oscillator.
The SMART TEMPERATURE SENSOR combines digital output and on-chip
calibration to ensure major cost reductions and performance-related
advantages.
In applications where multiple sensors are used, easy multiplexing can
be obtained by using a corresponding number of microprocessor inputs or
by using low cost digital multiplexers.
Since the sensor requires no subsequent calibration, optimal cost
savings are recorded both during manufacturing and in the course of
after-sales servicing.
last update
November 14, 2010
SMT16030
reference
smt16030n
page
2/7
Pin-out and housing.
SOIC-8
5.08
Pin 1
Pin 1
Pin 7
+V
GND
Out
TO92
TO18
2
1
3
TO220
3.85 6.1
Pin 8
All Sizes in mm.
Bottom
view
1 3 2
metal backplate =
GND
1 2 3
Pin 5
0.41 1.27
1
2
Output
+ Vcc
3
HEMP housing
GND
C = 100 nF
Pin 1
Pin 2
Pin 3
Output
+ Vcc
GND
C
2
3
1
2.5
mm
(between Vcc and GND)
8.5
mm
last update
November 14, 2010
SMT16030
reference
smt16030n
page
3/7
Specifications
TO18
TO92
max
7.2
200
-
130
0.7
1.2
0.2
0.1
0.1
0.05
TO220
1
HEC
max
*
*
*
1.5
1.5
1.0
*
0.2
-
SOIC-8
max
*
*
*
1
1.5
1.0
*
0.05
0.05
Parameters
Supply voltage
2
Supply current
temperature
range
3
Total accuracy
4
min
4.75
160
-45
-30 + 100
°C
-45 + 130
°C
typ
5
max
*
*
*
1.2
2
0.4
*
0.2
-
Max
*
*
*
1.7
1.7
0.5
*
0.2
-
Units
V.
µA.
°C
°C
°C
°C
°C/V
°C
°C
Non linearity
5
Supply voltage sensitivity
Repeatability
Long term Drift
Operating
temperature
Storage
temperature
-45
-50
130
150
*
*
*
*
*
*
*
*
°C
°C
Output
- duty cycle
- frequency
- noise
- impedance
- short circuit
1
=0.320+0.00470*t ( t=temperature
in C)
-
4
0.005
*
*
*
*
*
*
*
*
*
*
*
Khz
°C
Ohm
200
*
infinite maximum current
applied 40 mA
1
2
3
4
5
* All not mentioned specifications are the same as for TO18
Case connected to ground
The SMT 30-160-18 can be used from -65 to +160 °C for a short period
without physical damage to the device. The specified accuracy applies
only to the rated performance temperature range.
Total accuracy includes all errors.
Applicable from -30 to +100 °C
last update
November 14, 2010
SMT16030
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.
reference
smt16030n
page
4/7
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:
D.C. = 0.320+0.00470*t
D.C. = duty cycle
t = Temperature in °C
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 %
In the output frequency of the sensor there is no temperature
information, only the duty 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).
Total accuracy
The mentioned equation is the nominal one. The maximum deviation from
the nominal equation is defined as total accuracy. With temperatures
above 100 °C the accuracy decreases.
last update
November 14, 2010
SMT16030
reference
smt16030n
page
5/7
Non linearity
Non-linearity as it applies to the SMT160-30 is the deviation from the
best-fit straight line over the whole temperature range. For the
temperature range of -30 °C to +100 °C the non-linearity is less than
0.2 °C (TO18).
Long-term drift
This drift strongly depends on the operating condition. At room
temperature the drift is very low (< 0.05 °C). However at higher
temperatures the drift will be worse, mainly because of changes in
mechanical stress. This drift is partly irreversible and causes non-
ideal repeatability and long-term effects. At temperatures above 100 °C
(but in the operating range) a long-term drift better than 0.1 °C is to
be expected.
Noise
The resolution is better than 0.005 °C. The standard deviation of the
noise level (measured over a 20 ms. period) is below this 0.005 °C
.
Time constants
The time constant of the sensor is measured under different
circumstances.
To compare this with other types of sensors the same kind of
measurements were done. The time constant is defined as the time
required to reach 63% of an instantaneous temperature change.
The figures mentioned below are difficult to measure; an accuracy of
around 5 % is a reasonable estimation. These figures only apply to the
sensor built in a TO-18 housing and not the TO-92, the TO220 nor the
naked chip. The values found only depend on the physical parameters of
the measurement setup.
Condition
mounted in an alu block of a certain
temperature (mean value of different measurements)
in a bath filled with oil that was stirred
(mean value of different measurements)
Moving air with a speed of about 3 m/s
- without heatsink
- with heatsink
Non moving air
-without heatsink
-with heatsink
timeconstant
(s) (TO18)
0.6
1.4
13.5
5
60
100
Overview of time constants in different conditions
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