Low Voltage Temperature Sensors
TMP35/TMP36/TMP37
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
Qualified for automotive applications
FUNCTIONAL BLOCK DIAGRAM
+V
S
(2.7V TO 5.5V)
SHUTDOWN
TMP35/
TMP36/
TMP37
V
OUT
Figure 1.
PIN CONFIGURATIONS
V
OUT
+V
S
NC
1
2
3
TOP VIEW
(Not to Scale)
00337-002
00337-003
APPLICATIONS
Environmental control systems
Thermal protection
Industrial process control
Fire alarms
Power system monitors
CPU thermal management
5 GND
4 SHUTDOWN
NC = NO CONNECT
Figure 2. RJ-5 (SOT-23)
V
OUT
1
NC 2
8 +V
S
GENERAL DESCRIPTION
The TMP35/TMP36/TMP37 are low voltage, precision centi-
grade 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 maxi-
mum. 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.
7 NC
TOP VIEW
NC 3 (Not to Scale) 6 NC
GND 4
5 SHUTDOWN
NC = NO CONNECT
Figure 3. R-8 (SOIC_N)
1
2
3
BOTTOM VIEW
(Not to Scale)
00337-004
PIN 1, +V
S
; PIN 2, V
OUT
; PIN 3, GND
Figure 4. T-3 (TO-92)
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.
Rev. F
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 ©1996–2010 Analog Devices, Inc. All rights reserved.
00337-001
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
Automotive Products ................................................................. 20
REVISION HISTORY
11/10—Rev. E to Rev. F
Changes to Features.......................................................................... 1
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
Added Automotive Products Section .......................................... 20
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. F | Page 2 of 20
TMP35/TMP36/TMP37
SPECIFICATIONS
V
S
= 2.7 V to 5.5 V, −40°C ≤ T
A
≤ +125°C, unless otherwise noted.
Table 1.
Parameter
1
ACCURACY
TMP35/TMP36/TMP37 (F Grade)
TMP35/TMP36/TMP37 (G Grade)
TMP35/TMP36/TMP37 (F Grade)
TMP35/TMP36/TMP37 (G Grade)
Scale Factor, TMP35
Scale Factor, TMP36
Scale Factor, TMP37
Symbol
Test Conditions/Comments
T
A
= 25°C
T
A
= 25°C
Over rated temperature
Over rated temperature
10°C ≤ T
A
≤ 125°C
−40°C ≤ T
A
≤ +125°C
5°C ≤ T
A
≤ 85°C
5°C ≤ T
A
≤ 100°C
3.0 V ≤ V
S
≤ 5.5 V
0 μA ≤ I
L
≤ 50 μA
−40°C ≤ T
A
≤ +105°C
−105°C ≤ T
A
≤ +125°C
T
A
= 25°C
3.0 V ≤ V
S
≤ 5.5 V
T
A
= 150°C for 1 kHz
V
IH
V
IL
V
S
= 2.7 V
V
S
= 5.5 V
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
I
L
I
SC
C
L
100
0
Note 2
No oscillations
2
Output within ±1°C, 100 kΩ||100 pF load
2
1000
10000
0.5
1.8
400
250
750
500
2000
50
250
1
5.5
50
0.5
Min
Typ
±1
±1
±2
±2
10
10
20
20
Max
±2
±3
±3
±4
Unit
°C
°C
°C
°C
mV/°C
mV/°C
mV/°C
mV/°C
Load Regulation
Power Supply Rejection Ratio
Linearity
Long-Term Stability
SHUTDOWN
Logic High Input Voltage
Logic Low Input Voltage
OUTPUT
TMP35 Output Voltage
TMP36 Output Voltage
TMP37 Output Voltage
Output Voltage Range
Output Load Current
Short-Circuit Current
Capacitive Load Driving
Device Turn-On Time
POWER SUPPLY
Supply Range
Supply Current
Supply Current (Shutdown)
1
2
PSRR
6
25
30
50
0.5
0.4
20
60
100
m°C/μA
m°C/μA
m°C/V
m°C/V
°C
°C
V
mV
mV
mV
mV
mV
μA
μA
pF
ms
V
μA
μA
V
S
I
SY
(ON)
I
SY
(OFF)
2.7
Unloaded
Unloaded
0.01
Does not consider errors caused by self-heating.
Guaranteed but not tested.
Rev. F | Page 3 of 20
TMP35/TMP36/TMP37
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
1, 2
Supply Voltage
Shutdown Pin
Output Pin
Operating Temperature Range
Die Junction Temperature
Storage Temperature Range
IR Reflow Soldering
Peak Temperature
Time at Peak Temperature Range
Ramp-Up Rate
Ramp-Down Rate
Time 25°C to Peak Temperature
IR Reflow Soldering—Pb-Free Package
Peak Temperature
Time at Peak Temperature Range
Ramp-Up Rate
Ramp-Down Rate
Time 25°C to Peak Temperature
1
Rating
7V
GND ≤ SHUTDOWN ≤ +V
S
GND ≤ V
OUT
≤ +V
S
−55°C to +150°C
175°C
−65°C to +160°C
220°C (0°C/5°C)
10 sec to 20 sec
3°C/sec
−6°C/sec
6 min
260°C (0°C)
20 sec to 40 sec
3°C/sec
−6°C/sec
8 min
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
θ
JA
is specified for the worst-case conditions, that is, a device in
socket.
Table 3. Thermal Resistance
Package Type
TO-92 (T-3)
SOIC_N (R-8)
SOT-23 (RJ-5)
θ
JA
162
158
300
θ
JC
120
43
180
Unit
°C/W
°C/W
°C/W
ESD CAUTION
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.
Rev. F | Page 4 of 20
TMP35/TMP36/TMP37
TYPICAL PERFORMANCE CHARACTERISTICS
50
0.4
+V
S
= 3V TO 5.5V, NO LOAD
0.3
LOAD REGULATION (m°C/µA)
40
30
POWER SUPPLY REJECTION (°C/V)
0.2
20
0.1
00337-009
10
00337-005
0
–50
0
50
TEMPERATURE (°C)
100
150
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
125
Figure 5. Load Regulation vs. Temperature (m°C/μA)
Figure 8. Power Supply Rejection vs. Temperature
2.0
1.8
1.6
POWER SUPPLY REJECTION (°C/V)
a. TMP35
b. TMP36
c. TMP37
+V
S
= 3V
100.000
31.600
10.000
3.160
1.000
0.320
0.100
00337-010
c
OUTPUT VOLTAGE (V)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
125
00337-007
b
a
0.032
0.010
20
100
1k
FREQUENCY (Hz)
10k
100k
Figure 6. Output Voltage vs. Temperature
Figure 9. Power Supply Rejection vs. Frequency
5
4
MINIMUM SUPPLY VOLTAGE (V)
5
MINIMUM SUPPLY VOLTAGE REQUIRED TO MEET
DATA SHEET SPECIFICATION
NO LOAD
3
b
2
3
ACCURACY ERROR (°C)
4
2
1
0
–1
–2
–3
a
a. MAXIMUM LIMIT (G GRADE)
b. TYPICAL ACCURACY ERROR
c. MINIMUM LIMIT (G GRADE)
b
a
1
00337-011
–4
–5
0
20
40
c
60
80
100
TEMPERATURE (°C)
120
140
00337-008
a. TMP35/TMP36
b. TMP37
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
125
Figure 7. Accuracy Error vs. Temperature
Figure 10. Minimum Supply Voltage vs. Temperature
Rev. F | Page 5 of 20
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