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TMP17GS Fiches technique(PDF) 7 Page - Analog Devices

No de pièce TMP17GS
Description  Low Cost, Current Output Temperature Transducer
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

TMP17GS Fiches technique(HTML) 7 Page - Analog Devices

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TMP17
REV. 0
–7–
A variable temperature controlling thermostat can easily be built
using the TMP17 in the circuit of Figure 18.
TMP17
10k
RHYST
RPULL-UP
+15V
AD790
COMPARATOR
(OPTIONAL)
C
RHIGH
62.7k
RSET
10k
C
TEMP > SETPOINT
OUTPUT HIGH
TEMP < SETPOINT
OUTPUT LOW
RLOW
27.3k
REF01E
10V
Figure 18. Variable Temperature Thermostat
R
HIGH and RLOW determine the limits of temperature controlled
by the potentiometer R
SET. The circuit shown operates over the
temperature range
25
°C to 105°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 R
LOW.
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.
AD7501
D
E
C
O
D
E
R
/
D
R
I
V
E
R
T8
T2
T1
REMOTE
TMP17s
S1
S2
S8
EN
TTL DTL TO
CMOS I/O
CHANNEL
SELECT
+15V
–15V
VOUT
10k
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
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.
+15V
COLUMN
SELECT
4028 BCD TO DECIMAL DECODER
ROW
SELECT
EN
+15V
–15V
80 – TMP17s
10k
VOUT
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.
R
ROFFSET/RGAIN
OP196
VOUT = 100mV/(
oC OR oF)
+5V
REF43
V–
C
F
≈ 9.1kΩ
≈ 9.8kΩ
100k
180k
RGAIN
ROFFSET
TMP17
RCAL
2.5V
RGAIN
ROFFSET
Figure 21. Celsius or Fahrenheit Thermometer


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