Analog Devices TMP37GT9, TMP37GS, TMP37GRT, TMP35FT9, TMP35FS Datasheet

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REV. B
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a
TMP35/TMP36/TMP37
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Fax: 781/326-8703 © Analog Devices, Inc., 2001
Low Voltage Temperature Sensors

FUNCTIONAL BLOCK DIAGRAM

+V
s
(2.7V to 5.5V)
V
OUT
SHUTDOWN
TMP35/
TMP36/
TMP37

PACKAGE TYPES AVAILABLE

RT-5 (SOT-23)
1
2
3
5
4
TOP VIEW
(Not to Scale)
NC = NO CONNECT
V
OUT
SHUTDOWN
GND
NC
+V
S
SO-8
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
NC = NO CONNECT
V
OUT
SHUTDOWN
NC
NC
+V
S
NC
NC
GND
TO-92
1 3
2
BOTTOM VIEW
(Not to Scale)
PIN 1, +V
s
; PIN 2, V
OUT
; PIN 3, GND

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)
2C Accuracy Over Temperature (Typ)
0.5C Linearity (Typ)
Stable with Large Capacitive Loads
Specified –40C to +125C, Operation to +150C
Less than 50 A Quiescent Current
Shutdown Current 0.5 A Max
Low Self-Heating

APPLICATIONS

Environmental Control Systems
Thermal Protection
Industrial Process Control
Fire Alarms
Power System Monitors
CPU Thermal Management

PRODUCT 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. 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 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 tempera-
tures 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 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 all available in low cost 3-pin
TO-92, and SO-8 and 5-pin SOT-23 surface mount packages.
REV. B
–2–
TMP35/TMP36/TMP37–SPECIFICATIONS
1
(V
S
= 2.7 V to 5.5 V, –40C T
A
+125C unless
otherwise noted)
Parameter Symbol Conditions Min Typ Max Unit
ACCURACY
TMP35/TMP36/TMP37F T
A
= 25°C ±1 ±2 °C
TMP35/TMP36/TMP37G T
A
= 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 T
A
125°C 10 9.8/10.2 mV/°C
Scale Factor, TMP36 –40°C T
A
+125°C 10 9.8/10.2 mV/°C
Scale Factor, TMP37 5°C T
A
85°C 20 19.6/20.4 mV/°C
5°C T
A
100°C 20 19.6/20.4 mV/°C
3.0 V +V
S
5.5 V
Load Regulation 0 µA I
L
50 µA
–40°C T
A
+105°C620m°C/µA
–105°C T
A
+125°C2560m°C/µA
Power Supply Rejection Ratio PSRR T
A
= 25°C 30 100 m°C/V
3.0 V +V
S
5.5 V 50 m°C/V
Linearity 0.5 °C
Long-Term Stability T
A
= +150°C for 1 kHrs 0.4 °C
SHUTDOWN
Logic High Input Voltage V
IH
V
S
= 2.7 V 1.8 V
Logic Low Input Voltage V
IL
V
S
= 5.5 V 400 mV
OUTPUT
TMP35 Output Voltage T
A
= 25°C 250 mV
TMP36 Output Voltage T
A
= 25°C 750 mV
TMP37 Output Voltage T
A
= 25°C 500 mV
Output Voltage Range 100 2000 mV
Output Load Current I
L
050µA
Short-Circuit Current I
SC
Note 2 250 µA
Capacitive Load Driving C
L
No Oscillations
2
1000 10000 pF
Device Turn-On Time Output within ±1°C 0.5 1 ms
100 k100 pF Load
2
POWER SUPPLY
Supply Range +V
S
2.7 5.5 V
Supply Current I
SY (ON)
Unloaded 50 µA
Supply Current (Shutdown) I
SY (OFF)
Unloaded 0.01 0.5 µA
NOTES
1
Does not consider errors caused by self-heating.
2
Guaranteed but not tested.
3
See Figure 1.
Specifications subject to change without notice.
TEMPERATURE – C
–50
LOAD REG – mC/A
0 50 100 150
50
30
20
10
0
40
Figure 1. Load Reg vs. Temperature (m
°
C/
µ
A)
REV. B
TMP35/TMP36/TMP37
3

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Shutdown Pin . . . . . . . . . . . . . . GND
SHUTDOWN +V
S
Output Pin . . . . . . . . . . . . . . . . . . . . . . GND V
OUT
+V
S
Operating Temperature Range . . . . . . . . . . –55°C to +150°C
Dice Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 175°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +160°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . 300°C
*CAUTION
1. Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; functional operation
at or above this specification is not implied. Exposure to the above maximum
rating conditions for extended periods may affect device reliability.
2. Digital inputs are protected; however, permanent damage may 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.
3. Remove power before inserting or removing units from their sockets.
Package Type
JA
JC
Units
TO-92 (T9 Suffix) 162 120 °C/W
SO-8 (S Suffix) 158 43 °C/W
SOT-23 (RT Suffix) 300 180 °C/W
θ
JA
is specified for device in socket (worst-case conditions).

ORDERING GUIDE

Accuracy Linear
at 25C Operating Package
Model (C max) Temperature Range Options
1
TMP35FT9 ±2.0 10°C to 125°C TO-92
TMP35GT9 ±3.0 10°C to 125°C TO-92
TMP35FS ±2.0 10°C to 125°C SO-8
TMP35GS ± 3.0 10°C to 125°C SO-8
TMP35GRT
2
±3.0 10°C to 125°C RT-5
TMP36FT9 ±2.0 –40°C to +125°C TO-92
TMP36GT9 ±3.0 –40°C to +125°C TO-92
TMP36FS ±2.0 –40°C to +125°C SO-8
TMP36GS ± 3.0 –40°C to +125°C SO-8
TMP36GRT
2
±3.0 –40°C to +125°C RT-5
TMP37FT9 ±2.0 5°C to 100°C TO-92
TMP37GT9 ±3.0 5°C to 100°C TO-92
TMP37FS ±2.0 5°C to 100°C SO-8
TMP37GS ± 3.0 5°C to 100°C SO-8
TMP37GRT
2
±3.0 5°C to 100°C RT-5
NOTES
1
SO = Small Outline; RT = Plastic Surface Mount; TO = Plastic.
2
Consult factory for availability.

FUNCTIONAL DESCRIPTION

An equivalent circuit for the TMP3x family of micropower,
centigrade temperature sensors is shown in Figure 2. At the
heart of the temperature sensor is a bandgap core, which is
comprised of transistors Q1 and Q2, biased by Q3 to approxi-
mately 8 µA. The bandgap core operates both Q1 and Q2 at the
same collector current level; however, since the emitter area of
Q1 is 10 times that of Q2, Q1’s V
BE
and Q2’s V
BE
are not equal
by the following relationship:
V
BE
=V
T
× ln
A
E,Q1
A
E,Q2
SHDN
+V
OUT
+V
S
3X
25A
2X
Q2
1X
R1
R2
R3
7.5A
Q3
2X
GND
Q4
Q1
10X
6X
Figure 2. Temperature Sensor Simplified
Equivalent Circuit
Resistors R1 and R2 are used to scale this result to produce the
output voltage transfer characteristic of each temperature sensor
and, simultaneously, R2 and R3 are used to scale Q1s V
BE
as
an offset term in V
OUT
. Table I summarizes the differences
between the three temperature sensors output characteristics:
Table I. TMP3x Output Characteristics
Offset Output Voltage Output Voltage
Sensor Voltage (V) Scaling (mV/C) @ 25C
TMP35 0 10 250 mV
TMP36 0.5 10 750 mV
TMP37 0 20 500 mV
The output voltage of the temperature sensor is available at the
emitter of Q4, which buffers the bandgap core and provides load
current drive. Q4s current gain, working with the available base
current drive from the previous stage, sets the short-circuit
current limit of these devices to 250 µA.
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
the TMP35/TMP36/TMP37 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.
WARNING!
ESD SENSITIVE DEVICE
REV. B
TMP35/TMP36/TMP37
4
TEMPERATURE C
1.4
0
1.2
1.0
0.8
0.6
0.4
0.2
1.6
1.8
2.0
50 25 0 25 50 75 100 125
OUTPUT VOLTAGE V
a
b
c
a. TMP35
b. TMP36
c. TMP37
V
S
= 3V
TPC 1. Output Voltage vs. Temperature
a. MAXIMUM LIMIT ( G GRADE )
b. TYPICAL ACCURACY ERROR
c. MINIMUM LIMIT ( G GRADE )
TEMPERATURE C
2
5
1
0
1
2
3
4
3
4
5
0 20 40 60 80 100 120 140
a
b
c
ACCURACY ERROR C
TPC 2. Accuracy Error vs. Temperature
TEMPERATURE C
0.4
0.3
0
50 12525 0 25 50 75 100
0.2
0.1
POWER SUPPLY REJECTION C/V
V+ = 3V to 5.5V, NO LOAD
TPC 3. Power Supply Rejection vs. Temperature
FREQUENCY Hz
100
0.01
20 100k100 1k 10k
31.6
10
3.16
1
0.32
0.1
0.032
POWER SUPPLY REJECTION C/V
TPC 4. Power Supply Rejection vs. Frequency
TEMPERATURE C
4
3
0
2
1
5
50 12525 0 25 50 75 100
MINIMUM SUPPLY VOLTAGE V
b
a
MINIMUM SUPPLY VOLTAGE REQUIRED TO MEET
DATA SHEET SPECIFICATION
NO LOAD
a. TMP35/ TMP36
b. TMP37
TPC 5. Minimum Supply Voltage vs. Temperature
SUPPLY CURRENT A
TEMPERATURE C
50
40
10
30
20
60
50 12525 0 25 50 75 100
NO LOAD
b
a
a. V+ = 5V
b. V+ = 3V
TPC 6. Supply Current vs. Temperature
Typical Performance Characteristics
REV. B
TMP35/TMP36/TMP37
5
SUPPLY VOLTAGE V
40
30
0
20
10
50
07123456
SUPPLY CURRENT A
T
A
= 25°C, NO LOAD
8
TPC 7. Supply Current vs. Supply Voltage
TEMPERATURE C
40
30
0
20
10
50
50 12525 0 25 50 75
100
a. V+ = 5V
b. V+ = 3V
NO LOAD
a
b
SUPPLY CURRENT nA
TPC 8. Supply Current vs. Temperature (Shutdown = 0 V)
TEMPERATURE C
400
300
0
200
100
50 12525 0 25 50 75
100
= V+ AND SHUTDOWN PINS
LOW TO HIGH (0V TO 3V)
V
OUT
SETTLES WITHIN ±1°C
= V+ AND SHUTDOWN PINS
HIGH TO LOW (3V TO 0V)
RESPONSE TIME s
TPC 9. V
OUT
Response Time for V+ Power-Up/Power-
Down vs. Temperature
TEMPERATURE C
400
300
0
200
100
50 12525 0 25 50 75
100
= SHUTDOWN PIN
HIGH TO LOW (3V TO 0V)
= SHUTDOWN PIN
LOW TO HIGH (0V TO 3V)
V
OUT
SETTLES WITHIN ±1°C
RESPONSE TIME s
TPC 10. V
OUT
Response Time for Shutdown Pin vs.
Temperature
TIME
µ
s
0
1.0
0.8
0.6
0.4
0.2
50 2500 10050 150 200 300 350 400 450
OUTPUT VOLTAGE Volts
0
1.0
0.8
0.6
0.4
0.2
V+ = 3V
SHUTDOWN =
SIGNAL
T
A
= 25°C
V+ AND SHUTDOWN =
T
A
= 25°C
SIGNAL
TPC 11. V
OUT
Response Time to Shutdown and V+
Pins vs. Time
TIME sec
70
0
60
50
40
30
20
10
80
90
100
110
0
100
200 300 400 500 600
a
b
c
V
IN
= 3V, 5V
PERCENT OF CHANGE %
a. TMP35 SOIC SOLDERED TO 0.5" x 0.3" Cu PCB
b. TMP36 SOIC SOLDERED TO 0.6" x 0.4" Cu PCB
c. TMP35 TO-92 IN SOCKET SOLDERED TO
1" x 0.4" Cu PCB
TPC 12. Thermal Response Time in Still Air
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