V
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/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 ADCs. 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.
TMP35/TMP36/TMP37
FUNCTIONAL BLOCK DIAGRAM
+
(2.7V TO 5.5V)
S
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
The TMP37 is intended for applications over the range of 5°C
to 100°C and 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, 8-lead SOIC_N, and 5-lead SOT-23 surface-mount
packages.
TMP35/
TMP36/
TMP37
Figure 1.
GND
5
TOP VIEW
(Not to Scale)
4
SHUTDOWN
Figure 2. RJ-5 (SOT-23)
8
+V
S
7
TOP VIEW
(Not to Scale)
NC
6
NC
SHUTDOWN
5
Figure 3. R-8 (SOIC_N)
2
1 3
BOTTOM VIEW
(Not to Scale)
; PIN 2, V
S
; PIN 3, GND
OUT
Figure 4. T-3 (TO-92)
V
OUT
00337-004
00337-001
00337-002
00337-003
Rev. E
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©1996–2008 Analog Devices, Inc. All rights reserved.
TMP35/TMP36/TMP37
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution .................................................................................. 4
Typical Performance Characteristics ............................................. 5
Functional Description .................................................................... 8
Applications Information ................................................................ 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
Microprocessor Interrupt Generator ....................................... 13
Thermocouple Signal Conditioning with Cold-Junction
Compensation ............................................................................. 14
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
REVISION HISTORY
8/08—Rev. D to Rev. E
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
3/05—Rev. C to Rev. D
Updated Format .................................................................. Universal
Changes to Specifications ................................................................ 3
Additions to Absolute Maximum Ratings ..................................... 4
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
10/02—Rev. B to Rev. C
Changes to Specifications ................................................................. 3
Deleted Text from Commentary on Long-Term Stability
Section .............................................................................................. 13
Updated Outline Dimensions ....................................................... 14
9/01—Rev. A to Rev. B
Edits to Specifications ....................................................................... 2
Addition of New Figure 1 ................................................................. 2
Deletion of Wafer Test Limits Section ............................................ 3
6/97—Rev. 0 to Rev. A
3/96—Revision 0: Initial Version
Rev. E | 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.
Parameter1 Symbol Test Conditions/Comments Min Typ Max Unit
ACCURACY
TMP35/TMP36/TMP37 (F Grade) TA = 25°C ±1 ±2 °C
TMP35/TMP36/TMP37 (G Grade) TA = 25°C ±1 ±3 °C
TMP35/TMP36/TMP37 (F Grade) Over rated temperature ±2 ±3 °C
TMP35/TMP36/TMP37 (G Grade) 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 VIH VS = 2.7 V 1.8 V
Logic Low Input Voltage VIL VS = 5.5 V 400 mV
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 IL 0 50 μA
Short-Circuit Current ISC Note 2 250 μA
Capacitive Load Driving CL
Device Turn-On Time
POWER SUPPLY
Supply Range VS 2.7 5.5 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.
No oscillations
Output within ±1°C, 100 kΩ||100 pF load
2
1000 10000 pF
2
0.5 1 ms
Rev. E | Page 3 of 20
TMP35/TMP36/TMP37
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
1, 2
Rating
Supply Voltage 7 V
Shutdown Pin
Output Pin GND ≤ V
GND ≤ SHUTDOWN
≤ +VS
OUT
Operating Temperature Range −55°C to +150°C
Die Junction Temperature 175°C
Storage Temperature Range −65°C to +160°C
IR Reflow Soldering
Peak Temperature 220°C (0°C/5°C)
Time at Peak Temperature Range 10 sec to 20 sec
Ramp-Up Rate 3°C/sec
Ramp-Down Rate −6°C/sec
Time 25°C to Peak Temperature 6 min
IR Reflow Soldering—Pb-Free Package
Peak Temperature 260°C (0°C)
Time at Peak Temperature Range 20 sec to 40 sec
Ramp-Up Rate 3°C/sec
Ramp-Down Rate −6°C/sec
Time 25°C to Peak Temperature 8 min
1
Digital inputs are protected; however, permanent damage can 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.
≤ +VS
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
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.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device in
socket.
Table 3. Thermal Resistance
Package Type θJA θ
Unit
JC
TO-92 (T-3) 162 120 °C/W
SOIC_N (R-8) 158 43 °C/W
SOT-23 (RJ-5) 300 180 °C/W
ESD CAUTION
Rev. E | Page 4 of 20
TMP35/TMP36/TMP37
TYPICAL PERFORMANCE CHARACTERISTICS
50
40
30
20
0.4
+VS = 3V TO 5.5V, NO LOAD
0.3
0.2
LOAD REGULAT ION (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 VOL TAGE (V)
0.4
0.2
a. TMP35
b. TMP36
c. TMP37
+V
= 3V
S
0
–50 –25 0 25 50 75 100 125
TEMPERATURE ( °C)
Figure 6. Output Voltage vs. Temperature
0.1
POWER SUPPLY REJECTI ON (°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
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
00337-008
Rev. E | Page 5 of 20
5
MINIMUM SUPPLY VOLTAGE REQUIRED TO MEET
DATA SHEET SPECIFICATION
4
NO LOAD
3
2
1
MINIMUM SUPPLY VOLTAGE (V)
a. TMP35/TMP36
b. TMP37
0
–50 125–25 0 25 50 75 100
TEMPERATURE (°C)
Figure 10. Minimum Supply Voltage vs. Temperature
b
a
00337-011
TMP35/TMP36/TMP37
60
a. +VS = 5V
b. +V
= 3V
50
40
30
SUPPLY CURRENT (µA)
20
S
NO LOAD
a
b
400
300
200
RESPONSE TIME (µs)
100
= +VS AND SHUTDOWN PINS
HIGH TO LOW (3V TO 0V)
= +VS AND SHUTDOWN PI NS
LOW TO HIGH (0V TO 3V)
SETTLES WITHIN ±1°C
V
OUT
10
–50 125–250 255075100
TEMPERATURE ( °C)
Figure 11. Supply Current vs. Temperature
50
TA = 25°C, NO LOAD
40
A)
μ
30
20
SUPPLY CURRENT (
10
0
07123 456
SUPPLY VOLTAGE (V)
Figure 12. Supply Current vs. Supply Voltage
50
a. +VS= 5V
b. +V
= 3V
S
NO LOA D
25 50 75
0
TEMPERATURE ( °C)
a
SUPPLY CURRENT (nA)
40
30
20
10
0
–50 125–25
Figure 13. Supply Current vs. Temperature (Shutdown = 0 V)
100
00337-012
0
–50 125–250255075
Figure 14. V
Response Time for +VS Power-Up/Power-Down vs.
OUT
TEMPERATURE (° C)
100
00337-015
Temperature
400
= SHUTDOWN PIN
HIGH TO LOW (3V TO 0V)
300
200
RESPONSE T IME (µs)
100
00337-013
8
b
00337-014
0
–50 125–25 0 25 50 75
Figure 15. V
1.0
0.8
0.6
0.4
0.2
1.0
0.8
OUTPUT VOLTAGE (V)
0.6
0.4
0.2
Figure 16. V
Response Time for
OUT
TA = 25°C
+V
SHUTDOWN =
SIGNAL
0
TA = 25°C
+V
AND SHUTDOWN =
S
0
–50 2500 10050 150 200 300 350 400 450
Response Time to
OUT
= SHUTDOWN PI N
LOW TO HIGH (0V TO 3V)
SETTLES WITHIN ±1°C
V
OUT
TEMPERATURE (°C)
SHUTDOWN
= 3V
S
SIGNAL
TIME (µs)
SHUTDOWN
100
00337-016
Pin vs. Temperature
00337-017
Pin and +VS Pin vs. Time
Rev. E | Page 6 of 20
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