Rev.1.1
LOW-VOLTAGE C-MOS
HIGH-PRECISION TEMPERATURE SENSOR IC
S-8120AMP
The S-8120AMP is a high-precision temperature sensor IC that outputs
voltage with a temperature coefficient of -8.5mV/°C and a temperature
accuracy of ± 2.5°C. A temperature sensor, a constant current circuit
and an operational amplifier are integrated on a single chip to be able
to operate at 2.4V. The operating temperature ranges from -40°C to
+100°C. The S-8120AMP is superior in linearity over conventional
temperature sensors like thermistors. It can be applied to an ever
expanding wide range of applications that call for high-precision
thermal control.
n Features
n Block Diagram
l Temperature accuracy : ± 2.5°C ( -30°C to +100°C)
l Linear Output Voltage : -8.5mV/°C
Ta = - 30°C : 1.823 V typ.
Ta = +30°C : 1.326 V typ.
Ta = + 100°C : 0.718 V typ.
l Nonlinearity : ± 0.5 % typ. ( -20°C to +80°C )
l Vss standard output
l Low voltage operation : Vdd min. = 2.4 V
l Low current consumption : Idd typ. = 4.5µA ( +25°C)
l Small plastic package ( SOT23-3 )
+
−
3
V dd
2
V out
1
V ss
Temperature sensor
n Pin Assignment
SOT 23 - 3
3
2
1
1. Vss
2. Vout
3. Vdd
( Top view )
Seiko Instruments Inc.
1
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR IC
S-8120AMP
n Absolute Maximum Ratings
Item
Power supply voltage
(Vss=0.0V)
Output voltage
Operating temperature
Storage temperature
Symbol
Vdd
Ratings
6.5
Unit
V
Vout
Topr
Tstg
Vss to Vdd
-40 to +100
-55 to +125
V
°C
°C
Item
Power supply voltage
(Vss=0.0V)
Symbol
Vdd
Condition
Min.
2.4
Output voltage
Vout
Temperature sensitivity
Nonlinearity
Operating temperature
Current consumption
Vse
NL
Topr
Idd
Ta = - 30°C
Ta = + 30°C
Ta = + 100°C
- 30 ≤ Ta ≤ + 100°C
- 20 ≤ Ta ≤ + 80°C
1.802
1.305
0.697
- 8.78

- 40

n Electrical characteristics
Ta = + 25°C
Seiko Instruments Inc.
( - 40°C ≤ Ta ≤ +100°C, Vdd=5V)
Typ.
Max.
Unit
6.0
V

1.823
1.326
0.718
- 8.50
± 0.5

4.5
1.844
1.347
0.739
- 8.22

+ 100
10.0
V
V
V
mV/°C
%
V
µA
2
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120AMP
n Definition of terms
Output voltage Vout
1. Output voltage ( Vout )
Output voltage Vout is defined as the voltage
between measured pin-2 and Vss.
Vout is linearly proportional to ambient
temperature.
S-8120AMP is tested for Vout at -30°C,+30°C
and +100°C.
max.
min.
-30°C
0°C
+30°C
Ambient temperature Ta
+100°C
2. Temperature sensitivity ( Vse )
Output voltage Vout
Temperature sensitivity Vse is defined as the
average slope of the Vout versus Ta curve
using
the following formula.
Vse =
Vout(-30)
{Vout(+100) - Vout(-30)}
130
slope : Temperature sensitivity
Vout(+100) : Output voltage at
Ta=+100°C
Vout( - 30) : Output voltage at Ta= - 30°C
Vout(+100)
-30°C
3. Nonlinearity
0°C
+30°C
Ambient temperature Ta
+100°C
NL
Output voltage Vout
Nonlinearity NL is defined as the deviation
of the Vout versus Ta curve from the best-fit
straight line over the device’s rated
temperature range.
a
Vout(-20)
Vout vs. Ta curve
a
NL = × 100
b
a
b
a
a : The maximum deviation of the Vout
vs.
Ta curve from the best-fit straight line
between - 20°C and +80°C.
b : The difference of the output voltage
between - 20°C and +80°C.
Best-fit
straight line
Vout(+80)
−20°C 0°C
Ambient temperature Ta
Seiko Instruments Inc.
+80°C
3
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120AMP
n Load conditions
Load capacitance : CL ≤ 100p F
Load resistance : RL ≥ 500k Ω
(Note : Do NOT connect a pull-up resistor to Vout pin.)
C L ≤ 100 p F
R L ≥ 500 k Ω
pin-2
S-8120AMP
V out
Seiko Instruments Inc.
CL
RL
4
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120AMP
n Typical performance characteristics
Ambient temperature (Ta) - Output voltage (Vout)
Accuracy - Temperature
2000
TYP
MIN
MAX
1800
1600
Output
Voltage
Vout [mV] 1400
Ambient
Temperature
Ta’ - Ta [°C]
1200
1000
800
600
-40
-20
0
20
40
60
Temperature Ta [°C]
80
100
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-40
-20
0
20
40
60
80
100
Ambient temperature Ta [°C]
Ambient Temperature (Ta) - Current consumption (Idd typ.)
10
1400
9
1300
8
Current
consumption
Idd[µA]
TYP
MAX
MIN
Typical heat response from 25°C air into 100°C air
1200
7
5
1100
Output
Voltage
Vout [mV] 1000
4
900
6
3
800
2
700
1
0
-40
600
-20
0
20
40
60
80
Ambient temperature Ta [°C]
100
0
Power supply voltage (Vdd) - Output voltage (Vout typ.)
30
60
90
Time [sec]
120
150
180
Power supply voltage (Vdd) - Output voltage (Vout typ.)
1342
1915
Ta=+30°C
Ta=-40°C
1914
1341
1913
Output
Voltage
Vout [mV]
1340
Output
Voltage
Vout [mV]
1912
1339
1911
1338
1910
1337
2
3
4
5
Power supply voltage Vdd [V]
6
2
Power supply voltage (Vdd) - Output voltage (Vout typ.)
3
4
5
Power supply voltage Vdd [V]
[‚u]
6
Power supply voltage (Vdd) - Current consumption (Idd typ.)
734
10
Ta=+100°C
Ta=+30°C
9
733
8
7
Output
Voltage
Vout [mV]
732
Output
Voltage
Vout [mV]
731
6
5
4
3
730
2
1
729
2
3
4
5
Power supply voltage Vdd [V]
6
0
Seiko Instruments Inc.
2
3
4
5
Power supply voltage Vdd [V]
6
5
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120AMP
Start up response
Ta=25°C, CL=100pF, RL=10MΩ
V dd
( = 6V )
2V/div
GND
V out
1V/div
GND
50 µ sec/div
Ta=25°C, CL=100pF, RL=10MΩ
V dd
( = 2.4V )
2V/div
GND
V out
1V/div
GND
50 µ sec/div
Seiko Instruments Inc.
6
MP003-A 990531
SOT-23-3
Unit:mm
Dimensions
2.9
0.2
0.25
1
2.8 +0.2
-0.6
1.5
2
0.95
3
0.16 +0.1
-0.05
0.1
1.9
0.2
1.1±0.1
1.3max.
0.4±0.1
0
0.1
Taping Specifications
1.5
+0.1
-0.05
2.0±0.1
Reel Specifications
1 reel holds 3000 ICs.
4.0±0.1
12.5max.
1.1±0.1
4.0±0.1
0.25±0.05
1.6±0.1
2.85±0.2
9.0±0.3
T2
Winding core
21±0.5
φ13±0.2
2±0.2
(60°)
Feed direction
(60°)
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•
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The information herein is subject to change without notice.
Seiko Instruments Inc. is not responsible for any problems caused by circuits or other diagrams
described herein whose industrial properties, patents or other rights belong to third parties. The
application circuit examples explain typical applications of the products, and do not guarantee any
mass-production design.
When the products described herein include Strategic Products (or Service) subject to regulations,
they should not be exported without authorization from the appropriate governmental authorities.
The products described herein cannot be used as part of any device or equipment which influences
the human body, such as physical exercise equipment, medical equipment, security system, gas
equipment, vehicle or airplane, without prior written permission of Seiko Instruments Inc.