aTS51
L
OW
-V
OLTAGE
SOT-23
T
EMPERATURE
S
ENSOR WITH
H
IGH
O
UTPUT
D
RIVE
New Release Specification
General Description
The aTS51 is a high-precision CMOS temperature
sensor that provides a cost-effective solution for
applications requiring high-accuracy low-power
temperature monitoring. The aTS51 is ideally suited for
applications requiring high drive current. The aTS51
output voltage ramp is extremely linear and has a
slope of 10mV/°C. With a supply voltage of 2.7V to
6V, the aTS51 is accurate to ±1°C over a temperature
range of
−40°C
to 125°C and has a typical room
temperature accuracy of ±0.5°C. Reducing the supply
voltage to 2.7V does not change the negative and
positive temperature extremes. As well, the aTS51
does not require external calibration. Calibration of
each device is performed at the factory.
P
RODUCT
S
PECIFICATION
Pin Configuration
SOT- 23 3-lead
V
DD
1
aTS51
V
OUT
2
3
GND
actual part marking below
Features
•
•
•
•
•
•
•
•
•
•
Precision Calibrated to ±1°C at 25°C
Low Output Impedance for 1mA Load
Temperature Range: -40°C to 125°C
Extremely Linear Output Ramp: 10mV/°C
Output Ramp is Calibrated to Degrees Celsius
Accuracy (°C)
4
3
2
1
0
-1
-2
-3
-4
-50
-40
Accuracy vs Temperature
V
DD
=+5V
Low Operating Current:
≤
130μA
Low Self Heating: 0.2°C Typical in Still Air
Operating Voltage Range: +2.7V to +6V
Uses a Single Positive Supply
Non-linearity:
≤
0.8°C
upper spec limit
lower spec limit
0
25
Applications
•
•
•
•
•
•
•
•
•
•
Mobile Phones
Mobile Communications Terminals
Computers
Battery Management
FAX Machines/Printers/Copiers
Portable Medical Instruments
HVAC
Power Supply Modules
Disk Drives
Automotive Control Circuits
50
100
125
Temperature (°C)
Ordering Information
Part Number
aTS51S3
y – year, w - week
Package
3-Pin SOT-23
Temperature Range
-40˚C to +125˚C
Part Marking
AByw
How Supplied
3000 units on T&R
© Andigilog, Inc. 2003
www.andigilog.com
70A03203-003
aTS51
Absolute Maximum Ratings
1
Parameter
Supply Voltage
Output Voltage
Continuous Current, any terminal
Storage Temperature Range
ESD
2
Human Body Model
Machine Model
Thermal Resistance -
θ
JA
Lead
Temp
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
+7V
V
DD
+ 0.5V
15mA
-60°C to +150°C
2000V
250V
336°C/W
215°C
220°C
Notes:
1. Absolute maximum ratings are limits beyond
which operation may cause permanent damage to
the device. These are stress ratings only;
functional operation at or above these limits is not
implied.
2. Human Body Model: 100pF capacitor discharged
through a 1.5kΩ resistor into each pin. Machine
Model: 200pF capacitor discharged directly into
each pin.
3. These specifications are guaranteed only for the
test conditions listed.
Recommended Operating Ratings
Symbol
V
DD
V
OUT
T
A
Parameter
Supply Voltage
Output Voltage
Operating Temperature Range
Min
+2.7
0
-40
Max
+6
V
DD
+125
Units
V
V
°C
Electrical Characteristics
3
Limits apply for -40°C
≤
T
A
≤
+125°C and V
D D
= + 5.0V unless otherwise noted.
Parameter
Accuracy
4
Symbol
Conditions
T
A
=+25°C
T
A
=-40°C (T
MIN
)
T
A
=+125°C (T
MAX
)
Min
-1
-3
-3
Typ
±0.5
±1
±1
±0.8
Max
+1
+3
+3
130
Units
°C
°C
°C
°C
μA
mA
mA
mV/°C
mV
°C
Non-linearity
5
Supply Current – Output floating
Output Sink Capability
Average Output Slope
(Sensor Gain)
Room Temperature Output
Voltage
Self Heating
7
6
6
I
DD
I
OL
I
OH
A
OUT
V
OUT25
T
A
=+25°C
+2.7V < V
DD
< +6V
+2.7V < V
DD
< +6V
1
1
10
T
A
=+25°C
SOT-23
750
0.21840
Output Source Capability
Notes:
4. Accuracy (expressed in °C) = Difference between calculated output voltage and measured output voltage.
Calculated output voltage = 10mV/°C multiplied by device’s case temperature at specified conditions of
temperature, voltage and power supply.
5. Non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight
line, over the device’s rated temperature range.
6. Lowest output current should be targeted; higher currents result in more self-heating of the device.
7. Max Self Heating =
θ
JA
x (V
DD
x I
DD
). Assumes a capacitive load.
© Andigilog, Inc. 2003
-2-
www.andigilog.com
70A03203-004
aTS51
V
OUT
(mV)
1750
1500
750
500
100
-50 -40
-25
0
25
50
75
100
125
Temperature (ºC)
Temp (ºC) = (V
OUT
– 500mV) / 10mV/ºC
Figure 1. aTS51 Output Voltage vs. Temperature
Mounting
The aTS51 can be easily mounted by gluing or
cementing it to a surface. In this case, its temperature
will be within about 0.2°C of the temperature of the
surface it is attached to if the ambient air temperature
is almost the same as the surface temperature. If the
air temperature is much higher or lower than the
surface temperature, the actual temperature of the
aTS51 die will be at an intermediate temperature
between the surface temperature and the air
temperature.
To ensure good thermal conductivity, the backside of
the aTS51 die is directly attached to the GND pin. The
lands and traces to the aTS51 will, of course, be part of
the printed circuit board, which is the object whose
temperature is being measured. These printed circuit
board lands and traces will not cause the aTS51’s
temperature to deviate from the desired temperature.
Alternatively, the aTS51 can be mounted inside a
sealed-end metal tube, and can then be dipped into a
bath or screwed into a threaded hole in a tank. As
with any IC, the aTS51 and accompanying wiring and
circuits must be kept insulated and dry to avoid
leakage and corrosion. This is especially true if the
circuit may operate at cold temperatures where
condensation can occur. Printed-circuit coatings and
varnishes such as Humiseal and epoxy paint or dips
can be used to ensure that moisture cannot corrode
the aTS51 or its connections.
NOTE: When taking advantage of the high current drive capability of the aTS51 while
driving resistive loads, it is necessary to apply the appropriate thermal mounting
techniques as described above. Failure to do so will result in a loss of accuracy due to
increased self heating.
© Andigilog, Inc. 2003
-3-
www.andigilog.com
70A03203-004
aTS51
Typical Performance Characteristics
V
DD
=+5V
4
3
Accuracy (°C)
2
1
0
-1
-2
-3
-4
-50
-40
upper spec limit
lower spec limit
0
25
50
100
125
Temperature (°C)
Figure 2. aTS51 Accuracy Range vs Temperature
130
120
110
100
90
V
DD
= +5V
I
DD
( mA)
I
DD
(µA)
80
70
60
50
40
30
20
10
0
-50
-25
0
25
50
75
100
125
Temperature (°C)
Figure 3. aTS51 Current vs Temperature
© Andigilog, Inc. 2003
-4-
www.andigilog.com
70A03203-004
aTS51
Typical Applications
5V
3.9K
V
Temp
U1
100K
FB
1μF
10K
U2
ENABLE
+
Adjustable
Shunt Voltage
Reference
IN
Serial
REF Analog-to-Digital
Converter
1.75V
U3
CLOCK
aTS51
SERIAL
DATA OUT
Figure 4. Serial Output Temperature to Digital Converter (Full Scale = +125˚C)
5V
30K
aTS51
U1
V
Temp
IN
8
PARALLEL
DATA
OUTPUT
_
U2
5K
1μF
15K
+
1.75V
V
REF
Parallel Output
Analog-to-Digital
Converter
INTR
U3
CS
RD
WR
Figure 5. Parallel Output Temperature to Digital Converter (Full Scale = +125˚C)
© Andigilog, Inc. 2003
-5-
www.andigilog.com
70A03203-004
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