Contents
Features.............................................................. 1
Block Diagram..................................................... 1
Pin Assignment ................................................... 1
Dimensions ......................................................... 2
Absolute Maximum Ratings................................. 2
Electrical characteristics...................................... 2
Definition of Terms.............................................. 3
Load conditions ................................................... 4
Typical performance characteristics .................... 5
Frequently Asked Questions................................ 7
S-8120AMP ver.1.00
Seiko Instruments Inc.
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.
Features
Block Diagram
Temperature accuracy :
±
2.5
°
C ( -30
°
C to +100
°
C)
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.
Nonlinearity :
±
0.5 % typ. ( -20
°
C to +80
°
C )
Vss standard output
Low voltage operation : Vdd min. = 2.4 V
Low current consumption : Idd typ. = 4.5
µ
A ( +25
°
C)
Small plastic package ( SOT23-3 )
Pin Assignment
SOT 23 - 3
2
3
1
1. Vss
2. Vout
3. Vdd
( Top view )
Temperature sensor
+
-
V dd
3
V out
2
V ss
1
S-8120AMP ver.1.00
Seiko Instruments Inc.
2
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR IC
S-8120AMP
Dimensions
SOT23-3
2.9(3.1 max.)
2
3
1
0.25
1.5
0.4
±
0.1
2.8
+0.2
-0.6
0.16
+0.1
-0.06
0.95
±
0.1
0.95
±
0.1
1
±
0.1
0.0 min.
1.3 max.
1.9
±
0.2
Unit : mm
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Power supply voltage
(Vss=0.0V)
Vdd
6.5
V
Output voltage
Vout
Vss to Vdd
V
Operating temperature
Topr
-40 to +100
°
C
Storage temperature
Tstg
-55 to +125
°
C
Electrical characteristics
( - 40
°
C
Ta
+100
°
C, Vdd=5V)
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Power supply voltage
(Vss=0.0V)
Vdd
2.4
6.0
V
Ta = - 30
°
C
1.802
1.823
1.844
V
Output voltage
Vout
Ta = + 30
°
C
1.305
1.326
1.347
V
Ta = + 100
°
C
0.697
0.718
0.739
V
Temperature sensitivity
Vse
- 30
Ta
+ 100
°
C
- 8.78
- 8.50
- 8.22
mV/
°
C
Nonlinearity
NL
- 20
Ta
+ 80
°
C
±
0.5
%
Operating temperature
Topr
- 40
+ 100
V
Current consumption
Idd
Ta = + 25
°
C
4.5
10.0
µ
A
S-8120AMP ver.1.00
Seiko Instruments Inc.
3
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120AMP
Definition of terms
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.
2. Temperature sensitivity ( Vse )
Temperature sensitivity Vse is defined as the
average slope of the Vout versus Ta curve
using
the following formula.
{
Vout(+100) - Vout(-30)
}
130
Vse =
Vout(+100) : Output voltage at
Ta=+100
°
C
Vout( - 30) : Output voltage at Ta= - 30
°
C
3. Nonlinearity NL
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
b
×
100
NL =
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.
Output voltage Vout
0
°
C
+100
°
C
max.
min.
+30
°
C
Ambient temperature Ta
-30
°
C
Vout(-30)
Vout(+100)
slope : Temperature sensitivity
Output voltage Vout
0
°
C
+100
°
C
+30
°
C
-30
°
C
Ambient temperature Ta
Output voltage Vout
a
Vout(-20)
b
a
a
Vout(+80)
Vout vs. Ta curve
Best-fit
straight line
Ambient temperature Ta
0
°
C
+80
°
C
-
20
°
C
S-8120AMP ver.1.00
Seiko Instruments Inc.
4
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120AMP
Load conditions
Load capacitance : C
L
100p F
Load resistance
: R
L
500k
(Note : Do NOT connect a pull-up resistor to Vout pin.)
S-8120AMP
V out
R L
C L
C L
100 p F
R L
500 k
pin-2
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