New Release Specification
Andigilog, Inc. 2003
www.andigilog.com
70A03201-001
L
OW
-V
OLTAGE
U
LTRA
-L
OW
-P
OWER
T
EMPERATURE
S
ENSOR
aTS20
P
RODUCT
S
PECIFICATION
General Description
The aTS20 is a precision CMOS temperature sensor
that provides a cost-effective solution for space-
constrained applications. The output voltage ramp of
the aTS20 has a negative slope of -11.77mV/C. With
a supply voltage of 2.4V to 6V, the aTS20 is accurate
to
1C at 25C, and to
3C over the range of
-
40C
to 125C. Reducing the supply voltage to 2.4V does
not change the negative and positive temperature
extremes. As well, the aTS20 does not require
external calibration. Calibration of each device is
performed at the factory.
Features
= Extremely Low Power
= Precision Calibrated to 1C at 25C
= Ultra Low Operating Current :
10.5
A
= Temperature Range: -55C to 130C
= Linear Output Ramp: -11.77mV/C
= Output Ramp is Calibrated to Degrees Celsius
= Low Self Heating: 0.01C typical in still air
= Uses a Single Positive Supply
= Operating Voltage Range: +2.4V to +6V
= 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
aTS20
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
aTS20
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
aTS20F5 5-Pin
SC-70 -55C to +130C
Ayw
3000 units on T&R
y year, w - week
-50
0
50
100
Temperature (C)
A
c
c
u
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
c
u
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
70A03201-001
aTS20
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 operation 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
+2.4 +6
V
V
OUT
Output
Voltage
0
V
DD
V
T
A
Operating Temperature Range
-55
+130
C
Electrical Characteristics
3
Limits apply for -55C
T
A
+130C 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
)
-2
-3
-3
1
2
2
+2
+3
+3
C
C
C
Non-linearity
5
1
C
Supply Current - Output floating
I
DD
T
A
= +25C
-55C
T
A
+130C
7.5
5
9
10.5
12
A
Output Sink Capability
6
I
OL
V
DD
= +3V
20
A
Output Source Capability
6
I
OH
V
DD
= +3V
1
A
Average Output Slope
(Sensor Gain)
A
OUT
-11.77
mV/C
Output Voltage
V
OUT
T
A
=0C
+1863.9
mV
Capacitive Load
7
C
L
0
1000
pF
Self Heating
8
SC-70-5
0.01043
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. Higher capacitive loads may be driven by the output in a static mode, but it may require a delay time before initial
read at power up to allow charging of the capacitor.
8. 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
-20/+1 A
Storage Temperature Range
-60C to +150C
Human Body Model
2000V
ESD
3
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
70A03201-001
aTS20
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. aTS20 Output Voltage vs. Temperature
Mounting
The aTS20 can be easily mounted by gluing or
cementing it to a surface. In this case, its temperature
will be within about 0.01C 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 aTS20 die will
be at an intermediate temperature between the surface
temperature and the air temperature.
To ensure good thermal conductivity, the backside of the
aTS20 die is directly attached to the GND pin. The lands
and traces to the aTS20 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 aTS20's
temperature to deviate from the desired temperature.
Alternatively, the aTS20 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 aTS20 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 aTS20 or its connections.
- 4 -
Andigilog, Inc. 2003
www.andigilog.com
70A03201-001
aTS20
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. aTS20 Accuracy Range vs Temperature
I
DD
( m
A
)
6
7
8
9
10
11
12
-50
-25
0
25
50
75
100
125
Temperature (C)
V
DD
=+3V
0
1
2
3
4
5
I
DD
( m
A
)
6
7
8
9
10
11
12
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (C)
V
DD
=+3V
0
1
2
3
4
5
Figure 3. aTS Current vs Temperature
- 5 -
Andigilog, Inc. 2003
www.andigilog.com
70A03201-001
aTS20
Typical Applications
Note: The full scale of the A-to-D Converter will typically be limited to +125C simply by the number of bits available in the conversion.
The aTS20 would still be capable of its full output swing.
Figure 4. Serial Output Temperature to Digital Converter
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
aTS20
3V
V
Temp
Serial
Analog-to-Digital
Converter
Adjustable
Shunt Voltage
Reference
+
3V
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
aTS20
PDF 
ZIP