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기능 Low Cost/ Current Output Temperature Transducer
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TMP17FS 데이터시트, 핀배열, 회로
a
FEATURES
Operating Temperature Range: ؊40؇C to ؉105؇C
Single Supply Operation: ؉4 V to ؉30 V
Excellent Repeatability and Stability
High Level Output: 1 A/K
Monolithic IC: Temperature In/Current Out
Minimal Self-Heating Errors
APPLICATIONS
Appliance Temperature Sensor
Automotive Temperature Measurement and Control
HVAC System Monitoring
Industrial Temperature Control
Thermocouple Cold Junction Compensation
GENERAL DESCRIPTION
The TMP17 is a monolithic integrated circuit temperature
transducer that provides an output current proportional to
absolute temperature. For a wide range of supply voltages the
transducer acts as a high impedance temperature dependent
current source of 1 µA/K. Improved design and laser wafer
trimming of the IC’s thin-film resistors allows the TMP17 to
achieve absolute accuracy levels and nonlinearity errors
previously unattainable at a comparable price.
The TMP17 can be employed in applications between Ϫ40°C
to ϩ105°C where conventional temperature sensors (i.e.,
thermistor, RTD, thermocouple, diode) are currently being
used. Expensive linearization circuitry, precision voltage
references, bridge components, resistance measuring circuitry
and cold junction compensation are not required with the
TMP17.
378
343
1µA/K
273
248
45 25 0
70
TEMPERATURE – C
105 125
Figure 1. Transfer Characteristic
Low Cost, Current Output
Temperature Transducer
TMP17*
FUNCTIONAL DIAGRAM
NC NC
V NC
V NC
NC NC
PACKAGE DIAGRAM
SO-8
NC 1
8 NC
V2
7 NC
TOP VIEW
V 3 (Not to Scale) 6 NC
NC 4
5 NC
NC = NO CONNECT
The TMP17 is available in a low cost SO-8 surface-mount
package.
PRODUCT HIGHLIGHTS
1. A wide operating temperature range (Ϫ40°C to ϩ105°C)
and highly linear output make the TMP17 an ideal substi-
tute for older, more limited sensor technologies (i.e., therm-
istors, RTDs, diodes, thermocouples).
2. The TMP17 is electrically rugged; supply irregularities and
variations or reverse voltages up to 20 V will not damage
the device.
3. Because the TMP17 is a temperature dependent current
source, it is immune to voltage noise pickup and IR drops in
the signal leads when used remotely.
4. The high output impedance of the TMP17 provides greater
than 0.5°C/V rejection of supply voltage drift and ripple.
5. Laser wafer trimming and temperature testing insures that
TMP17 units are easily interchangeable.
6. Initial system accuracy will not degrade significantly over
time. The TMP17 has proven long term performance and
repeatability advantages inherent in integrated circuit design
and construction.
*Protected by U.S. Patent No. 4,123,698
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703




TMP17FS pdf, 반도체, 판매, 대치품
TMP17
THEORY OF OPERATION
The TMP17 uses a fundamental property of silicon transistors
to realize its temperature proportional output. If two identical
transistors are operated at a constant ratio of collector current
densities, r, then the difference in base-emitter voltages will be
(kT/q)(ln r). Since both k, Boltzmann’s constant, and q, the
charge of an electron, are constant, the resulting voltage is
directly Proportional To Absolute Temperature (PTAT). In the
TMP17 this difference voltage is converted to a PTAT current
by low temperature coefficient thin film resistors. This PTAT
current is then used to force the total output current to be
proportional to degrees Kelvin. The result is a current source
with an output equal to a scale factor times the temperature (K)
of the sensor. A typical V-I plot of the circuit at 125°C and the
temperature extremes is shown in Figure 6.
Factory trimming of the scale factor to 1 µA/K is accomplished
at the wafer level by adjusting the TMP17’s temperature
reading so it corresponds to the actual temperature. During
laser trimming the IC is at a temperature within a few degrees of
ϩ25°C and is powered by a 5 V supply. The device is then
packaged and automatically temperature tested to specification.
FACTORS AFFECTING TMP17 SYSTEM PRECISION
The accuracy limits given on the Specifications page for the
TMP17 make it easy to apply in a variety of diverse applica-
tions. To calculate a total error budget in a given system it is
important to correctly interpret the accuracy specifications, non-
linearity errors, the response of the circuit to supply voltage
variations and the effect of the surrounding thermal environ-
ment. As with other electronic designs external component
selection will have a major effect on accuracy.
0.2
0.1
TYPICAL NONLINEARITY
0
0.1
0.2
40 25
0 25
TEMPERATURE – C
70
105
Figure 8. Nonlinearity Error (TMP17)
TRIMMING FOR HIGHER ACCURACY
Calibration error at ϩ25°C can be removed with a single
temperature trim. Figure 9 shows how to adjust the TMP17’s
scale factor in the basic voltage output circuit.
+V
TMP17
R
100
950
VOUT = 1mV/K
CALIBRATION ERROR, ABSOLUTE ACCURACY AND
NONLINEARITY SPECIFICATIONS
Two primary limits of error are given for the TMP17 such that
the correct grade for any given application can easily be chosen
for the overall level of accuracy required. They are the calibra-
tion accuracy at ϩ25°C, and the error over temperature from
Ϫ40°C to ϩ105°C. These specifications correspond to the
actual error the user would see if the current output of a
TMP17 were converted to a voltage with a precision resistor.
Note that the maximum error at room temperature or over an
extended range, including the boiling point of water, can be
directly read from the specifications table. The error limits are a
combination of initial error, scale factor variation and non-
linearity deviation from the ideal 1 µA/K output. Figure 2
graphically depicts the guaranteed limits of accuracy for a
TMP17GS.
The TMP17 has a highly linear output in comparison to older
technology sensors (i.e., thermistors, RTDs and thermo-
couples), thus a nonlinearity error specification is separated
from the absolute accuracy given over temperature. As a
maximum deviation from a best-fit straight line this specification
represents the only error that cannot be trimmed out. Figure 8
is a plot of typical TMP17 nonlinearity over the full rated
temperature range.
Figure 9. Basic Voltage Output (Single Temperature Trim)
To trim the circuit the temperature must be measured by a
reference sensor and the value of R should be adjusted so the
output (VOUT) corresponds to 1 mV/K. Note that the trim
procedure should be implemented as close as possible to the
temperature highest accuracy is desired for. In most applications
if a single temperature trim is desired it can be implemented
where the TMP17 current-to-output voltage conversion takes
place (e.g., output resistor, offset to an op amp). Figure 10
illustrates the effect on total error when using this technique.
1.0
ACCURACY
WITHOUT TRIM
0.5
0
AFTER SINGLE
TEMPERATURE
CALIBRATION
0.5
1.0
40 25
25
TEMPERATURE – C
105
Figure 10. Effect of Scale Factor Trim on Accuracy
–4– REV. 0

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TMP17FS 전자부품, 판매, 대치품
TMP17
A variable temperature controlling thermostat can easily be built
using the TMP17 in the circuit of Figure 18.
+15V
10V
TMP17
10k
C
REF01E
RHIGH
62.7k
RSET
10k
AD790
COMPARATOR
RHYST
RPULL-UP
TEMP > SETPOINT
OUTPUT HIGH
TEMP < SETPOINT
OUTPUT LOW
RLOW
27.3k
(OPTIONAL)
C
control which row of sensors are being measured. The maxi-
mum number of TMP17s which can be used is the product of
the number of channels of the decoder and mux.
An example circuit controlling 80 TMP17s is shown in Figure
20. A 7-bit digital word is all that is required to select one of
the sensors. The enable input of the multiplexer turns all the
sensors off for minimum dissipation while idling.
COLUMN
SELECT
+15V
4028 BCD TO DECIMAL DECODER
ROW
SELECT
VOUT
10k
Figure 18. Variable Temperature Thermostat
RHIGH and RLOW determine the limits of temperature controlled
by the potentiometer RSET. The circuit shown operates over the
temperature range Ϫ25°C to ϩ105°C. The reference maintains
a constant set point voltage and insures that approximately 7 V
appears across the sensor. If it is necessary to guardband for
extraneous noise, hysteresis can be added by tying a resistor
from the output to the ungrounded end of RLOW.
Multiple remote temperatures can be measured using several
TMP17s with a CMOS multiplexer or a series of 5 V logic gates
because of the device’s current-mode output and supply-voltage
compliance range. The on-resistance of a FET switch or output
impedance of a gate will not affect the accuracy, as long as 4 V
is maintained across the transducer. Muxes and logic driving
circuits should be chosen to minimize leakage current related
errors. Figure 19 illustrates a locally controlled mux switching
the signal current from several remote TMP17s. CMOS or TTL
gates can also be used to switch the TMP17 supply voltages,
with the multiplexed signal being transmitted over a single
twisted pair to the load.
+15V
–15V
T8
T2
T1
REMOTE
TMP17s
AD7501
D
S1 E D
CR
S2 O I
DV
S8
EE
RR
/
TTL DTL TO
CMOS I/O
VOUT
10k
EN
CHANNEL
SELECT
+15V
–15V
80 – TMP17s
EN
Figure 20. Matrix Multiplexer
To convert the TMP17 output to °C or °F a single inexpensive
reference and op amp can be used as shown in Figure 21.
Although this circuit is similar to the two temperature trim
circuit shown in Figure 11, two important differences exist.
First, the gain resistor is fixed alleviating the need for an
elevated temperature trim. Acceptable accuracy can be achieved
by choosing an inexpensive resistor with the correct tolerance.
Second, the TMP17 calibration error can be trimmed out at a
known convenient temperature (i.e., room temperature) with a
single pot adjustment. This step is independent of the gain
selection.
+5V
REF43
2.5V
ROFFSET
R RCAL
ROFFSET/RGAIN
RGAIN
OP196
ROFFSET
C 9.1k
F 9.8k
RGAIN
100k
180k
VOUT = 100mV/(oC OR oF)
TMP17
V–
Figure 21. Celsius or Fahrenheit Thermometer
Figure 19. Remote Temperature Multiplexing
To minimize the number of muxes required when a large
number of TMP17s are being used, the circuit can be config-
ured in a matrix. That is, a decoder can be used to switch the
supply voltage to a column of TMP17s while a mux is used to
REV. 0
–7–

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TMP17FS

Low Cost/ Current Output Temperature Transducer

Analog Devices
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