Preliminary Specification
Andigilog, Inc. 2003
www.andigilog.com
70A03206-001
Preliminary Specification subject to change without notice
L
OW
-V
OLTAGE
U
LTRA
-L
OW
-P
OWER
T
EMPERATURE
S
ENSOR WITH
H
IGH
O
UTPUT
D
RIVE
aTS21
P
RODUCT
S
PECIFICATION
General Description
The aTS21 is a high precision silicon integrated circuit
temperature sensor. Improved accuracy relative to it's
industry counterparts the aTS21 maintains an
accuracy of 1C over a temperature range of
-
40C
to 125C. At 25C (room temperature) the accuracy is
calibrated to typically better than 0.5C (V
OUT
=
1569.7mV). This calibration is done during probe and
guaranteed on each device. The aTS21 also maintains
one of the lowest power consumption requirement in
the industry and therefore reduces any inaccuracies
due to self-heating. The device maintains all these
specifications over an operating voltage range of 2.7 to
6 volts.
The aTS21 has the same functionality as the aTS20
but with higher output drive for more demanding
applications.
Features
= Precision Calibrated to 1C at 25C
= Low Operating Current:
15
A
= Temperature Range: -40C to 125C
= Linear Output Ramp: -11.77mV/C
= Output Ramp is Calibrated to Degrees Celsius
= Low Self Heating: 0.02C Typical in Still Air
= Operating Voltage Range: +2.7V to +6V
= Uses a Single Positive Supply
= Non-linearity:
0.8
C
Applications
= Cellular Telephones
= Computers
= Battery Management
= FAX Machines/Printers/Copiers
= Portable Medical Instruments
= HVAC
= Power Supply Modules
= Disk Drives
= Appliances
Pin Configuration
5
3
4
1
2
SC70 5 -lead
aTS21
V
DD
GND
NC
GND
V
OUT
5
3
4
1
2
SC70 5 -lead
V
DD
GND
NC
GND
V
OUT
5
3
4
1
2
SC70 5 -lead
aTS21
V
DD
GND
NC
GND
V
OUT
5
3
4
1
2
SC70 5 -lead
V
DD
GND
NC
GND
V
OUT
actual part marking below
Accuracy vs Temperature
Ordering Information
Part Number
Package
Temperature Range
Part Marking
How Supplied
aTS21F5 5-Pin
SC-70 -40C to +125C
Fyw
3000 units on T&R
y year, w - week
-50
0
50
100
Temperature (C)
A
c
cu
ra
cy (
C)
V
DD
=+3V
lower spec limit
-4
-3
-2
-1
0
1
2
3
upper spec limit
-40
25
125
4
-50
0
50
100
Temperature (C)
A
c
cu
ra
cy (
C)
V
DD
=+3V
lower spec limit
-4
-3
-2
-1
0
1
2
3
upper spec limit
-40
25
125
4
-
2
-
Andigilog, Inc. 2003
www.andigilog.com
70A03206-001
Preliminary Specification subject to change without notice
aTS21
Absolute Maximum Ratings
1
Notes:
1. Absolute maximum ratings are limits beyond
which operation may cause permanent damage to
the device. These are stress ratings only;
functional operations at or above these limits is
not implied.
2. Human Body Model: 100pF capacitor discharged
through a 1.5k
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 Parameter Min
Max
Units
V
DD
Supply
Voltage
+2.7 +6
V
V
OUT
Output
Voltage
0
V
DD
V
T
A
Operating Temperature Range
-40
+125
C
Electrical Characteristics
3
Limits apply for -40C
T
A
+125C and V
D D
= + 3.0V unless otherwise noted.
Parameter Symbol
Conditions
Min
Typ
Max
Units
Accuracy
4
T
A
=+25C
T
A
=-40C
(T
MIN
)
T
A
=+125C (T
MAX
)
-1
-3
-3
0.5
1
1
+1
+3
+3
C
C
C
Non-linearity
5
0.8
C
Supply Current - Output floating
I
DD
T
A
=+25C
-40C
T
A
+125C
9
11
15
A
Output Sink Capability
6
I
OL
+2.7V < V
DD
< +6V
25
A
Output Source Capability
6
I
OH
+2.7V < V
DD
< +6V
200
A
Average Output Slope
(Sensor Gain)
A
OUT
-11.77
mV/C
Room Temp Output Voltage
V
OUT25
T
A
=0C
1836.9
mV
Self Heating
7
SC-70-5
0.02483
C
Notes:
4. Accuracy (expressed in C) = Difference between calculated output voltage and measured output voltage.
Calculated output voltage = -11.77mV/C multiplied by device's case temperature at specified conditions of
temperature, voltage and power supply plus an offset of 1863.9mV at 0C.
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 =
JA
x (V
DD
x I
DD
). Assumes a capacitive load.
Parameter Rating
Supply Voltage
+7V
Output Voltage
V
DD
+ 0.5V
Output Current
-100/+10 A
Storage Temperature Range
-60
C to +150
C
Human Body Model
2000V
ESD
2
Machine Model
250V
Thermal Resistance -
JA
331C
/W
Vapor Phase (60 sec)
215C
Lead
Temp
Infrared (15 sec)
220C
-
3
-
Andigilog, Inc. 2003
www.andigilog.com
70A03206-001
Preliminary Specification subject to change without notice
aTS21
25
50
75
100
125
-25
-50 -40
0
1500
100
V
OUT
(mV)
Temperature (C)
Temp (C) = (V
OUT
1863.9mV) / -11.77mV/C
2000
500
1000
25
50
75
100
125
-25
-50 -40
0
1500
100
V
OUT
(mV)
Temperature (C)
Temp (C) = (V
OUT
1863.9mV) / -11.77mV/C
2000
500
1000
2334.7
-40
1863.9
0
1569.7
25
686.9
100
392.7
125
V
OUT
(mV)
Temp
(
C)
2334.7
-40
1863.9
0
1569.7
25
686.9
100
392.7
125
V
OUT
(mV)
Temp
(
C)
Figure 1. aTS21 Output Voltage vs. Temperature
Mounting
The aTS21 can be easily mounted by gluing or
cementing it to a surface. In this case, its temperature
will be within about 0.02C 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
aTS21 die will be at an intermediate temperature
between the surface temperature and the air
temperature.
To ensure good thermal conductivity, the backside of
the aTS21 die is directly attached to the GND pin. The
lands and traces to the aTS21 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 aTS21's
temperature to deviate from the desired temperature.
Alternatively, the aTS21 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 aTS21 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 aTS21 or its connections.
- 4 -
Andigilog, Inc. 2003
www.andigilog.com
70A03206-001
Preliminary Specification subject to change without notice
aTS21
Typical Performance Characteristics
-50
0
50
100
Temperature (C)
A
ccu
r
a
cy
(
C
)
V
DD
=+3V
lower spec limit
-4
-3
-2
-1
0
1
2
3
upper spec limit
-40
25
125
4
-50
0
50
100
Temperature (C)
A
ccu
r
a
cy
(
C
)
V
DD
=+3V
lower spec limit
-4
-3
-2
-1
0
1
2
3
upper spec limit
-40
25
125
4
Figure 2. aTS21 Accuracy Range vs Temperature
I
DD
( m
A
)
-50
-25
0
25
50
75
100
125
Temperature (C)
I
DD
( m
A
)
-50
-25
0
25
50
75
100
125
Temperature (C)
I
DD
( m
A
)
-25
0
25
50
75
100
125
-25
0
25
50
75
100
125
Temperature (C)
V
DD
=+3V
V
DD
=+3V
V
DD
=+3V
6
7
8
9
10
11
12
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
-50
-50
0
1
2
3
4
5
13
14
15
16
I
DD
( m
A
)
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (C)
I
DD
( m
A
)
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (C)
I
DD
( m
A
)
-25
0
25
50
75
100
125
-25
0
25
50
75
100
125
Temperature (C)
V
DD
=+3V
V
DD
=+3V
V
DD
=+3V
V
DD
=+3V
V
DD
=+3V
V
DD
=+3V
6
7
8
9
10
11
12
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
-50
-50
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
0
1
2
3
4
5
13
14
15
16
6
7
8
9
10
11
12
-50
-50
0
1
2
3
4
5
13
14
15
16
Figure 3. aTS21 Current vs Temperature
- 5 -
Andigilog, Inc. 2003
www.andigilog.com
70A03206-001
Preliminary Specification subject to change without notice
aTS21
Typical Applications
Figure 4. Serial Output Temperature to Digital Converter (Full Scale = +125C)
Figure 5. Parallel Output Temperature to Digital Converter (Full Scale = +125C)
IN
10K
100K
1
F
FB
1.75V
REF
3.9K
SERIAL
DATA OUT
CLOCK
ENABLE
aTS21
5V
V
Temp
U1
U2
U3
Serial
Analog-to-Digital
Converter
Adjustable
Shunt Voltage
Reference
+
5V
WR
5K
30K
IN
V
REF
1.75V
15K
1
F
+
_
PARALLEL
DATA
OUTPUT
INTR
CS
RD
8
V
Temp
Parallel Output
Analog-to-Digital
Converter
aTS21
U1
U3
U2
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