Contents
Features .............................................................. 1
Block Diagram ..................................................... 1
Pin Assignment ................................................... 1
Absolute Maximum Ratings ................................. 2
Electrical characteristics ...................................... 2
Definition of Terms .............................................. 3
Load conditions ................................................... 4
Typical performance characteristics .................... 5
Dimensions.......................................................... 7
Seiko Instruments Inc.
1
LOW-VOLTAGE C-MOS
HIGH-PRECISION TEMPERATURE SENSOR IC
S-8120ANP
The S-8120AMP is a ultra-small packaged 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
·
Temperature accuracy :
±
2.5
°
C ( -30
°
C
+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
+80
°
C )
·
Vss standard output
·
Low voltage operation : Vdd min. = 2.4 V
·
Low current consumption : Idd typ. = 4.5
µ
A (+25
°
C)
·
Ultra-small plastic package ( SC-82AB )
n
Pin Assignment
SC-82AB
( Top view )
Temperature sensor
+
-
Vdd
1
Vout
4
Vss
2
N.C.
3
2
1
3
4
1. Vdd
2. Vss
3. N.C.
4. Vout
Rev.1.1
S-8120ANP ver.1.1
Seiko Instruments Inc.
2
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR IC
S-8120ANP
n
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Power supply Voltage
(Vss=0.0V)
Vdd
6.5
V
Output voltage
Vout
Vss
Vdd
V
Operating temperature
Topr
-40
+100
°
C
Storage temperature
Tstg
-55
+125
°
C
n
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-8120ANP ver.1.1
Seiko Instruments Inc.
3
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120ANP
n
Definition of terms
1. Output voltage ( Vout )
Output voltage Vout is defined as the voltage
between measured pin-4 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.
Vse
Vout
Vout
=
+
-
-
{
(
)
(
)}
1 0 0
3 0
1 3 0
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.
NL
a
b
=
~100
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.
Vout(-30)
Vout(+100)
0
°
C
+100
°
C
+30
°
slope : Temperature sensitivity
-30
°
C
Output voltage Vout
Ambient temperature Ta
Output voltage Vout
Ambient temperature Ta
a
Vout(-20)
b
a
a
Vout(+80)
0
°
C
+80
°
C
Vout vs. Ta curve
Best-fit
straight line
-20
°
C
Output voltage Vout
0
°
C
+100
°
C
max
.
min.
+30
°
C
Ambient temperature Ta
-30
°
C
S-8120ANP ver.1.1
Seiko Instruments Inc.
4
LOW-VOLTAGE C-MOS HIGH-PRECISION TEMPERATURE SENSOR
S-8120ANP
n
Load conditions
Load capacitance : C
L
100pF
Load resistance
: R
L
500k
(Note : Do NOT connect a pull-up resistor to Vout pin.)
S-8120ANP
Vout
R
L
C
L
C
L
100pF
R
L
500k
pin-4
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