Analog Devices TMP35 36 37 d Datasheet
Low Voltage Temperature Sensors
FEATURES
Low voltage operation (2.7 V to 5.5 V)
Calibrated directly in °C
10 mV/°C scale factor (20 mV/°C on TMP37)
±2°C accuracy over temperature (typ)
±0.5°C linearity (typ)
Stable with large capacitive loads
Specified −40°C to +125°C, operation to +150°C
Less than 50 µA quiescent current
Shutdown current 0.5 µA max
Low self-heating
APPLICATIONS
Environmental control systems
Thermal protection
Industrial process control
Fire alarms
Power system monitors
CPU thermal management
GENERAL DESCRIPTION
The TMP35, TMP36, and TMP37 are low voltage, precision,
centigrade temperature sensors. They provide a voltage output
that is linearly proportional to the Celsius (centigrade) temperature. The TMP35/TMP36/TMP37 do not require any external
calibration to provide typical accuracies of ±1°C at +25°C and
±2°C over the −40°C to +125°C temperature range.
The low output impedance of the TMP35/TMP36/TMP37 and
its linear output and precise calibration simplify interfacing to
temperature control circuitry and A/D converters. All three
devices are intended for single-supply operation from 2.7 V to
5.5 V maximum. The supply current runs well below 50 µA,
providing very low self-heating—less than 0.1°C in still air. In
addition, a shutdown function is provided to cut the supply
current to less than 0.5 µA.
The TMP35 is functionally compatible with the LM35/LM45
and provides a 250 mV output at 25°C. The TMP35 reads
temperatures from 10°C to 125°C. The TMP36 is specified from
−40°C to +125°C, provides a 750 mV output at 25°C, and
operates to 125°C from a single 2.7 V supply. The TMP36 is
functionally compatible with the LM50. Both the TMP35 and
TMP36 have an output scale factor of 10 mV/°C. The TMP37 is
intended for applications over the range 5°C to 100°C and
TMP35/TMP36/TMP37
FUNCTIONAL BLOCK DIAGRAM
VS (2.7V TO 5.5V)
SHUTDOWN
PIN CONFIGURATIONS
V
1
OUT
+V
2
S
3
NC
NC = NO CONNECT
1
V
OUT
2
NC
3
NC
4
GND
NC = NO CONNECT
PIN 1, +V
provides an output scale factor of 20 mV/°C. The TMP37
provides a 500 mV output at 25°C. Operation extends to 150°C
with reduced accuracy for all devices when operating from a
5 V supply.
The TMP35/TMP36/TMP37 are available in low cost 3-lead
TO-92, SOIC-8, and 5-lead SOT-23 surface-mount packages.
TMP35/
TMP36/
TMP37
Figure 1.
GND
5
TOP VIEW
(Not to Scale)
4
SHUTDOWN
Figure 2. RT-5 (SOT-23)
8
+V
S
7
TOP VIEW
(Not to Scale)
NC
6
NC
SHUTDOWN
5
Figure 3. RN-8 (SOIC )
2
1 3
BOTTOM VIEW
(Not to Scale)
; PIN 2, V
S
; PIN 3, GND
OUT
Figure 4. TO-92
V
OUT
00337-004
00337-001
00337-002
00337-003
Rev. D
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However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
www.analog.com
TMP35/TMP36/TMP37
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Typical Performance Characteristics ............................................. 5
Functional Description .................................................................... 8
Applications....................................................................................... 9
Shutdown Operation.................................................................... 9
Mounting Considerations ........................................................... 9
Thermal Environment Effects .................................................... 9
Basic Temperature Sensor Connections.................................. 10
Fahrenheit Thermometers ........................................................ 10
Average and Differential Temperature Measurement........... 12
REVISION HISTORY
3/05—Rev. C to Rev. D
Updated Format..................................................................Universal
Changes to Specifications................................................................ 3
Additions to Absolute Maximum Ratings..................................... 4
Updated Outline Dimensions....................................................... 19
Changes to Ordering Guide.......................................................... 19
Microprocessor Interrupt Generator....................................... 13
Thermocouple Signal Conditioning with Cold-Junction
Compensation
Using TMP3x Sensors in Remote Locations .......................... 15
Temperature to 4–20 mA Loop Transmitter .......................... 15
Temperature to Frequency Converter ..................................... 16
Driving Long Cables or Heavy Capacitive Loads.................. 17
Commentary on Long-Term Stability..................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 19
10/02—Rev. B to Rev. C
Deleted text from Commentary on Long-Term Stability section
........................................................................................................... 13
Update OUTLINE DIMENSIONS............................................... 14
9/01—Rev. A to Rev. B
............................................................................. 14
Rev. D | Page 2 of 20
TMP35/TMP36/TMP37
SPECIFICATIONS
VS = 2.7 V to 5.5 V, –40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 1.
Parameter
ACCURACY
TMP35/TMP36/TMP37F TA = 25°C ±1 ±2 °C
TMP35/TMP36/TMP37G TA = 25°C ±1 ±3 °C
TMP35/TMP36/TMP37F Over rated temperature ±2 ±3 °C
TMP35/TMP36/TMP37G Over rated temperature ±2 ±4 °C
Scale Factor, TMP35 10°C ≤ TA ≤ +125°C 10 mV/°C
Scale Factor, TMP36 –40°C ≤ TA ≤+125°C 10 mV/°C
Scale Factor, TMP37 5°C ≤ TA ≤ 85°C 20 mV/°C
5°C ≤ TA ≤ 100°C 20 mV/°C
3.0 V ≤ VS ≤ 5.5 V
Load Regulation 0 µA ≤ IL ≤ 50 µA
–40°C ≤ TA ≤ +105°C 6 20 m°C/µA
–105°C ≤ TA ≤ +125°C 25 60 m°C/µA
Power Supply Rejection Ratio PSRR TA = 25°C 30 100 m°C/V
3.0 V ≤ VS ≤ 5.5 V 50 m°C/V
Linearity 0.5 °C
Long-Term Stability TA = 150°C for 1 kHz 0.4 °C
SHUTDOWN
Logic High Input Voltage V
Logic Low Input Voltage V
OUTPUT
TMP35 Output Voltage TA = 25°C 250 mV
TMP36 Output Voltage TA = 25°C 750 mV
TMP37 Output Voltage TA = 25°C 500 mV
Output Voltage Range 100 2000 mV
Output Load Current I
Short-Circuit Current I
Capacitive Load Driving C
Device Turn-On Time Output within ±1°C 100 kΩ||100 pF load2 0.5 1 ms
POWER SUPPLY
Supply Range V
Supply Current ISY (ON) Unloaded 50 µA
Supply Current (Shutdown) ISY (OFF) Unloaded 0.01 0.5 µA
1
Does not consider errors caused by self-heating.
2
Guaranteed but not tested.
1
Symbol Conditions Min Typ Max Unit
IH
IL
L
SC
L
S
VS = 2.7 V 1.8 V
VS = 5.5 V 400 mV
0 50 µA
Note 2 250 µA
No oscillations
2
1000 10000 pF
2.7 5.5 V
Rev. D | Page 3 of 20
TMP35/TMP36/TMP37
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage 7 V
Shutdown Pin
Output Pin
Operating Temperature Range
Die Junction Temperature 175°C
Storage Temperature Range
IR Reflow Soldering
Peak Temperature 220°C (0°C/5°C)
Time at Peak Temperature 10 s to 20 s
Ramp-up Rate 3°C/s max
Ramp-down Rate
Time 25°C to Peak Temperature 6 mins max
IR Reflow Soldering—Pb-free
Package
Peak Temperature 260°C (0°C)
Time at Peak Temperature 20 s to 40 s
Ramp-up Rate 3°C/s max
Ramp-down Rate
Time 25°C to Peak Temperature 8 min max
1
Digital inputs are protected; however, permanent damage might occur
on unprotected units from high energy electrostatic fields. Keep units in
conductive foam or packaging at all times until ready to use. Use proper
antistatic handling procedures.
2
Remove power before inserting or removing units from their sockets.
1, 2
Rating
SHUTDOWN
GND ≤
GND ≤ V
OUT
≤ V
−55°C to +150°C
−65°C to +160°C
−6°C/s max
−6°C/s max
S
≤ V
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
S
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Package Type
θ
JA
θ
JC
Unit
1
TO-92 (T9 Suffix) 162 120 °C/W
SOIC-8 (S Suffix) 158 43 °C/W
SOT-23 (RT Suffix) 300 180 °C/W
1
θJA is specified for device in socket (worst-case conditions).
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. D | Page 4 of 20
TMP35/TMP36/TMP37
TYPICAL PERFORMANCE CHARACTERISTICS
50
0.4
40
30
20
LOAD REG (m°C/µA)
10
0
–50
0 50 100 150
TEMPERATURE (°C)
Figure 5. Load Regulation vs. Temperature (m°C/µA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
OUTPUT VOLTAGE (V)
0.4
0.2
a. TMP35
b. TMP36
c. TMP37
= 3V
V
S
0
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
Figure 6. Output Voltage vs. Temperature
5
4
3
a
2
1
0
–1
–2
ACCURACY ERROR (°C)
–3
–4
–5
0 20 40 60 80 100 120 140
a. MAXIMUM LIMIT (G GRADE)
b. TYPICAL ACCURACY ERROR
c. MINIMUM LIMIT (G GRADE)
b
c
TEMPERATURE (°C)
Figure 7. Accuracy Error vs. Temperature
V+ = 3V TO 5.5V, NO LOAD
0.3
0.2
0.1
POWER SUPPLY REJECTION (°C/V)
00337-005
0
–50 125–25 0 25 50 75 100
TEMPERATURE (°C)
00337-009
Figure 8. Power Supply Rejection vs. Temperature
100.000
c
b
a
00337-007
31.600
10.000
3.160
1.000
0.320
0.100
POWER SUPPLY REJECTION (°C/V)
0.032
0.010
20 100k100 1k 10k
FREQUENCY (Hz)
00337-010
Figure 9. Power Supply Rejection vs. Frequency
5
MINIMUM SUPPLY VOLTAGE REQUIRED TO MEET
DATA SHEET SPECIFICATION
4
NO LOAD
3
b
00337-008
2
1
MINIMUM SUPPLY VOLTAGE (V)
a. TMP35/TMP36
b. TMP37
0
–50 125–25 0 25 50 75 100
TEMPERATURE (°C)
a
00337-011
Figure 10. Minimum Supply Voltage vs. Temperature
Rev. D | Page 5 of 20
TMP35/TMP36/TMP37
60
a. V+ = 5V
50
40
30
SUPPLY CURRENT (µA)
20
b. V+ = 3V
NO LOAD
400
300
s)
µ
a
b
200
RESPONSE TIME (
100
= V+ AND SHUTDOWN PINS
HIGH TO LOW (3V TO 0V)
= V+ AND SHUTDOWN PINS
LOW TO HIGH (0V TO 3V)
V
SETTLES WITHIN ±1°C
OUT
10
–50 125–25 0 25 50 75 100
TEMPERATURE (°C)
Figure 11. Supply Current vs. Temperature
50
TA = 25°C, NO LOAD
40
30
20
SUPPLY CURRENT (µA)
10
0
07123 456
SUPPLY VOLTAGE (V)
Figure 12. Supply Current vs. Supply Voltage
50
a. V+ = 5V
b. V+ = 3V
40
NO LOAD
30
20
SUPPLY CURRENT (nA)
10
0
–50 125–25
25 50 75
0
TEMPERATURE (°C)
a
100
Figure 13. Supply Current vs. Temperature (Shutdown = 0 V)
00337-012
Figure 14. V
0
–50 125–25 0 25 50 75
Response Time for V+ Power-Up/Power-Down vs. Temperature
OUT
TEMPERATURE (°C)
100
00337-015
400
= SHUTDOWN PIN
HIGH TO LOW (3V TO 0V)
300
s)
µ
200
RESPONSE TIME (
8
00337-013
100
0
–50 125–25 0 25 50 75
Figure 15. V
Response Time for Shutdown Pin vs. Temperature
OUT
TEMPERATURE (°C)
= SHUTDOWN PIN
LOW TO HIGH (0V TO 3V)
V
SETTLES WITHIN ±1°C
OUT
100
00337-016
1.0
0.8
0.6
0.4
0.2
0
1.0
0.8
OUTPUT VOLTAGE (V)
0.6
0.4
b
00337-014
0.2
0
–50 2500 10050 150 200 300 350 400 450
Figure 16. V
OUT
TA = 25°C
V+ = 3V
SHUTDOWN =
SIGNAL
TA = 25°C
V+ AND SHUTDOWN =
SIGNAL
TIME (µs)
Response Time to Shutdown and V+ Pins vs. Time
00337-017
Rev. D | Page 6 of 20
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