ETC MLX90247_07

MLX90247 family
Discrete Infrared Thermopile Detectors
Features and Benefits
Solid state thermopile sensor
On-chip thermistor for ambient temperature compensation
High reliability and long-term stability
Low cost, small size
Ordering Information
Suffix
T a
P a rt N o
MLX90247
P a c k a g e c o d e
SF (TO-39)
E (-40C to +85C)
T y p e
D SA
D e s c r ip t io n
La r g e a p e r t u r e t h e r m o p i l e d e t e c t o r w i t h o n-c h i p P T C t h e r m i s t o r ,
f l o a t i ng t h e r m o p i l e o u t p u t s . 3. 5 m m a p e r t u r e
Notice: In case sensor is used in automotive applications, Melexis must be informed.
Applications
Automotive contactless temperature sensing.
IR thermometers
Gas analysis equipment
Occupancy detection
1. Functional Diagram
60 kOhm
1 Out IR+
40 uV/K
3 Out IR-
Thermopile
2 Rsense
24 kOhm
4
PTC
Socket
3901090247
Rev. 004
VSS
2. Description
At the heart of the MLX90247 thermopile sensors is a
silicon die with a central micromachined membrane
surrounded by a bulk silicon edge. The hot junctions of the
thermopile are positioned near the center of the membrane
and the cold junctions are located above the bulk silicon
edge. Infrared irradiation of the low thermal conductivity
membrane creates a temperature difference between the
membrane and the surrounding bulk silicon. The resulting
thermopile voltage is a function of the temperature
difference between the object and the sensor.
Measurement of the absolute temperature of the object is
possible by relating the thermopile signal to the
temperature of the sensor. The exact temperature of the
sensor is measured by a PTC thermistor integrated in the
bulk silicon edge. No supply voltage is needed for the
thermopile.
The sensor and thermistor can be used independently of
each other if desired, as the thermopile potential is floating.
Page 1 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
Table of contents
1.
FUNCTIONAL DIAGRAM..........................................................................................................1
2.
DESCRIPTION..........................................................................................................................1
3.
GLOSSARY OF TERMS ...........................................................................................................3
4.
PIN DEFINITIONS AND DESCRIPTIONS .................................................................................3
5.
MLX90247 SPECIFICATIONS...................................................................................................4
6.
ABSOLUTE MAXIMUM RATINGS ............................................................................................5
7.
UNIQUE FEATURES.................................................................................................................5
8.
APPLICATIONS INFORMATION ..............................................................................................6
9.
RELIABILITY INFORMATION...................................................................................................7
10.
ESD PRECAUTIONS ................................................................................................................7
11.
PACKAGE INFORMATION.......................................................................................................7
12.
DISCLAIMER ............................................................................................................................9
3901090247
Rev. 004
Page 2 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
3. Glossary of Terms
IR: Infrared. Every object emits infrared radiation in relation to its temperature. This effect can be used to
measure the temperature without the need for physical contact.
PTC: On-chip thermistor which resistance increases with rising temperature (Positive Thermal Coefficient)
tbb: Black body (object temperature)
ta: Ambient (die) temperature
4. Pin Definitions and Descriptions
TO-39 package - connections
1
P in
1
2
4
2
3
4
Sy m b o l
D e s c r ip t io n
R s e ns
T h e r m i s t o r - a m b i e nt ( d i e ) t e m p e r a t u r e s e ns o r
O u tIr+
O u tIrVs s
I nf r a r e d T h e r m o p i l e p o s i t i v e o u t p u t
I nf r a r e d T h e r m o p i l e ne g a t i v e o u t p u t
T h e r m i s t o r g r o u nd / c a s e p o t e nt i a l
3
Top view = pins down
3901090247
Rev. 004
Page 3 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
5. MLX90247 Specifications
Operating temperature range: Ta = -40 to 85 ˚C unless otherwise noted
P a ra m e te r
T y p ic a l
Se ns i t i v e A r e a
W a v e l e ng t h r a ng e
1. 2 x 1. 2
m m
12
V/W
5 .5 …
D C m e m b r a ne r e s p o ns i t i v i t y
Se ns i t i v i t y ( A l p h a )
4. 28
T h e r m o p ile o u t p u t v o lt a g e
U n it s
15
±25 % x
µ m
V/K4
T a = 25 ˚ C T b b = 6 0˚ C
F u ll F O V
µ V
T a = 26 ˚ C T b b = 27 ˚ C, F u l l F O V
D e g
5 0% t h e r m o p i l e s i g na l
> 7 0
%
7 . 5 µ m < λ < 13. 5 µ m
6 0
kΩ
T a = 25 ˚ C
N E P
2. 6
nW / √H z
R MS, T a = 25 ˚ C
T h e r m o p i l e r e s i s t a nc e t e m p c o
0. 1
W i nd o w a p e r t u r e s i z e
F ie ld o f v ie w
46
10-13
C o n d it io n
2
±25 %
3. 5
8 8
Sp e c t r a l s e ns i t i v i t y
< 1
T h e r m o p i l e R e s i s t a nc e
N o is e
32
T i m e c o ns t a nt
P T C v a l u e R ( 25 ° C)
P T C T C1
nV / √H z
m s
24 ±3 0 %
kΩ
16
+ 8 00
W i t h s t a nd E SD v o l t a g e
%
30
6 5 00 ±20 %
P T C T C2
m m
- 7 000
%/˚C
p p m /˚ C
0< λ < 5 µ m
R MS, T a = 25 ˚ C
T a = 25 ˚ C
p p m /˚ C2
V
V
NOTE: The thermistor resistance can be calculated using following expresion:
[
R(T ) = R(25o C ) 1 + TC1 (T − 25o C ) + TC2 (T − 25o C )2
]
Thermopile output voltage is:
Vir = Alpha .[ (To4) – (Ta4) ]
where To is the measured object temperature, both To and Ta are in Kelvins
Note: When measuring resistances with an ohm meter, please take care that the internal protection
diodes, as indicated in the functional diagram below, are always reverse biased.
3901090247
Rev. 004
Page 4 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
Internal schematics
6. Absolute Maximum Ratings
P a ra m e te r
St o r a g e T e m p e r a t u r e R a ng e
A p p lie d D Cv o lt a g e
V a l ue
U n it s
R e m a rk
-0. 5 ÷ 12
V
P i ns 1 a nd 3 t o g r o u nd ( p i n4)
-5 5 ÷ 15 0
°C
A p p lie d D Cv o lt a g e
-0. 5 ÷ 12
V
P i n 2 t o g r o u nd ( p i n4)
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolutemaximum-rated conditions for extended periods may affect device reliability.
7. Unique features
-
Fully CMOS compatible process
High reliability
Suitable for automotive applications
Thermistor integrated in silicon edge of the sensor: closest possible sensing of sensor
temperature
3901090247
Rev. 004
Page 5 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
8. Applications information
The output voltage of the thermopile is positive when the object is at higher temperature than the sensor;
it is negative when the object is at lower temperature than the sensor. As the output voltage can become
positive as well as negative, the sensor has to be connected to a differential amplifier that can accept both
positive and negative input signals. The figure below shows a solution using the MLX90313 infrared
sensor interface chip, which accepts common mode input voltages in the range [-0.1V;Vdd-3V]
IR+
IRRsens
VSS
MLX90247
VDD
5V
IRINP
C3
IRINN
TEMPOUT
TEMPOUT
TINP
IROUT
TINN
MLX90313
IROUT
CS
SCLK
DIN
DOUT
CS
SCLK
SDI
SDO
REL1
CREF
VSS
REL
VREFP
VREF
VSS/GND
R3
MLX90601KZA-CKA
MLX90601KZA-CKD
MLX90601KZA-CLA
R3 = 100kΩ
C3 = 10µF
The figure below shows a typical application with the AD8628 low-offset low-drift differential opamp from
Analog Devices. The AD8628 has single voltage supply, and can only accept positive common mode
input signals. Vref sets the output offset (output voltage when To=Ta).
100kΩ
100Ω
5V
+
Vref
3901090247
Rev. 004
60kΩ
AD8628
MLX90247DSA
Vthermopile
Page 6 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
9. Reliability Information
Melexis Infrared sensors are sealed to withstand a fine and gross leak test according MIL 883 Method
1014 (Seal)/ JEDEC-STD-22 Test Method A 109 (Hermeticity).
For more information on manufacturability / solderability see quality page at our website:
http://www.melexis.com/
Please contact Melexis for specific information using MLX90247 sensors in automotive applications.
10.
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
11.
Package information
Housing specifications
T O -39 s p e c i f i c a t i o ns
Me t a l c a p
W e ld e d
F i l l i ng g a s
N itr o g e n
T O 39 h e a d e r
Marking
P a rt N o
MLX90247
T y p e
D SA
A u P la te d
P a c k a g e C o d e
SF ( T O -39) , 3, 5 m m
MLX90247 B P T C F O XXXZ Z
M a r k in g
X X X - la s t d ig it s o f lo t n u m b e r
Z Z –w a fe r n u m b e r
Y Y W W – d a t e c o d e w it h Y Y - y e a r , W W - w e e k o f a s s e m b ly
3901090247
Rev. 004
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Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
Position of membrane in housing
Package Outline
3901090247
Rev. 004
Page 8 of 9
Data Sheet
Oct/07
MLX90247 family
Discrete Infrared Thermopile Detectors
12.
Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in
its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore,
prior to designing this product into a system, it is necessary to check with Melexis for current information.
This product is intended for use in normal commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional
processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury,
property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or
use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow
out of Melexis’ rendering of technical or other services.
© 2006 Melexis NV. All rights reserved.
For the latest version of this document, go to our website at:
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
Phone: +32 13 67 04 95
E-mail: [email protected]
All other locations:
Phone: +1 603 223 2362
E-mail: [email protected]
ISO/TS 16949 and ISO14001 Certified
3901090247
Rev. 004
Page 9 of 9
Data Sheet
Oct/07