LA0152CS Ambient Light Sensor IC Application Note

APPLICATION NOTE
LA0152CS
Monolithic Linear IC
For Ultra-small Ambient Light Sensor
Photo IC
Overview
The LA0152CS is a photo IC for micro-sized ambient light sensor. It enables to be mounted on a very small
limited space such as on the cell phones which is becoming small and thinner and on other mobile applications.
It is suitable for application like mobile phone, tablet PC, digital still camera and camcorder.
Features
 Smallest ODCSP package in the world (1.01mmX1.01mm, thickness:0.6mm)
 Integrated sleep mode (Max current 0.1uA)
 Low power consumption (150uA at 1,000Lux)
 Low dark current (Max current 0.1uA)
 No sensibility in infrared area
 Less difference in sensibility depending on the type of light source (Fluorescent/Incandescent:1.0/1.1)
 Linear current output
 Wide dynamic range (1~100,000Lux)
 Halogen free compliant
Pin Assignment
Package Dimensions
unit : mm (typ)
3350A
<Top View>
<Bottom View>
1
4
4
1
2
3
3
2
No.
1
2
3
4
Name
VCC
EN
GND
OUT
Function
Power supply
Enable
Ground
Output
Ball Pitch : 0.5mm , Ball Size : 0.18mm
▫
6Jun2012 Rev1.0 1/17
LA0152CS
Pad Layout (Photos)
This is a pin 1 mark which is located in
the middle of the backside of package.
Photo diode: Only this part looks dark.
Recommended Land Pattern
Unit [um]
Land ( pink ) : 300um square
Solder resist opening (green ) : 400um square
Block Diagram
VCC
1
Current
Amp.
OUT
4
2
EN
GND
3
2/22
LA0152CS
Chip Pattern and Photo-receiving Pattern Diagrams
Chip Pattern diagram （Top　View）
Photo-receiving Pattern Enlarged Diagram (effective area）
162
15
17
69
80.5
223
1010
249.5
10
105
80.5
105
1010
249.5
Unit：μ m
Unit：μ m
＊Pin 1 is on the upper left.
ODCSP Cross Section Structure
Optical Device Chip Size Package
SANYO original wafer level package for optical device.
Glass
Glue
（Contact pad）
Photodiode
Si
Insulator
PKG edge
Passivation
Redistribution layer
Solder Ball
3/22
LA0152CS
Specifications
Absolute Maximum Ratings at Ta=25C
Parameter
Maximum supply voltage
Operating temperature
Storage temperature
Symbol
VCC
Topr
Tstg
Conditions
Ratings
6
-30 to 85
-40 to 100
Unit
V
C
C
Recommended operating conditions and operating voltage range atTa=25
Parameter
Recommended supply voltage
EN pin low voltage
EN pin high voltage
Symbol
VCC
Vl
Vh
Conditions
Sleep mode
Normal operation mode
min
2.2
0
1.4
typ
3.3
max
5.5
0.4
VCC
Unit
V
V
V
Electrical and optical characteristics at VCC=3.3V, Ta=25
Parameter
Current dissipation *1, *3
Symbol
ICC
Conditions
min
90
typ
150
max
210
Unit
A
Sleep current (1) *3
Isl1
Ev=0 lux
0.1
A
Sleep current (2) *3
Isl2
Ev=1000 lux
0.3
A
Output current (1) *1, *3
Ev=100 lux
6
8
10
A
Output current (2) *1, *3
IO1
IO2
Ev=1000 lux
60
80
100
A
Dark current *3
Ileak
Ev=0 lux
0.1
A
Temperature coefficient *2
Itc
Ev=100 lx, Ta=-20 to 60
Rise time (1) *4
Tr1
Ev=1000
Fall time (1) *4
% / C
0.34
15
40
s
Tf1
150
500
s
Peak sensitivity wave length *2
λp
550
nm
Saturation output voltage *1, *3
VO
3.2
V
RL=150K, Ev=1000 lx
3.0
*1. Measured with the standard light source A. White LED is used instead in the mass production line.
*2. Design guaranteed item
*3. Test circuit for measuring current dissipation and output current
Light
Source
VCC
A
Ipd
OUT
LA0152CS
A
*4. Measuring method of rise time (Tr) and fall time (Tf)
Ipd
Pulse drive
White LED
VCC
0A
Ipd
1.5V
90％
OUT
LA0152CS
VOUT
10％
GND
Tr
Tf
4/22
LA0152CS
Typical Performance Characteristics
Output current - Illuminance
1000
Output current[μ A]
100
10
1
0.1
0.01
1
10
100
1000
10000
Illuminance Ev [lx]
Consumption current - Illuminance
100
10
1
10
100
Illuminance Ev [lx]
1000
10000
Sleep current - Illuminance
10
1
Sleep current[μ A]
Consumption current[μ A]
1000
0.1
0.01
0.001
0.0001
1
10
100
1000
10000
Illuminance Ev [lx]
5/22
LA0152CS
Relative output current－Vｃｃ (@1000lx)
1.4
Relative output current
1.2
1
0.8
0.6
0.4
0.2
0
2
3
4
5
6
Supply Voltage　Vcc[V]
Relative consumption current - Vｃｃ (@1000lx)
Relative consumption current
1.2
1
0.8
0.6
0.4
0.2
0
2
3
4
5
6
Supply Voltage　Vcc[V]
Relative output current - Ambient temperature
1.4
Relative current
1.2
1
0.8
0.6
0.4
0.2
0
-60
-40
-20
0
20
40
60
80
100
120
Ambient temperature Ta [℃]
6/22
LA0152CS
Ileak - Ambient temperature
1.E+00
1.E-01
Ileak[μ A]
1.E-02
1.E-03
1.E-04
1.E-05
1.E-06
-60
-40
-20
0
20
40
60
80
100
120
Ambient temperature Ta [℃]
Output Voltage－Illuminance (Vcc=3.3V ,RL=15K)
10
Output Voltage[V]
1
0.1
0.01
0.001
1
10
100
1000
10000
100000
Illuminance Ev[lx]
Ｒｅｌａｔｉｖｅ　Ｓｐｅｃｔｒａｌ　Ｒｅｓｐｏｎｓｉｖｉｔｙ
1
Relative Spectral Sensitivity
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
200
400
600
800
1000
lambda[nm]
7/22
LA0152CS
Directional Sensitivity : Normal Gain ＠1000lx
Directional Sensitivity
1.2
1
0.8
0.6
0.4
0.2
0
-90
-60
-30
0
30
60
90
degree[°]
Output current（μ A)
Output current - SW voltage
100
90
80
70
60
50
40
30
20
10
0
0
1
2
3
SW voltage(V)
Sleep current - Temp.
10
Sleep current[μ A]
1
0.1
0.01
EV=0lx
0.001
EV=1000lx
0.0001
-60
-40
-20
0
20
40
60
80
100
Temp.[℃]
8/22
LA0152CS
Sample Application Circuit
CPU A/D Input port
VCC
Power
supply
1
4
0.1uF
OUT
68KΩ
EN
2
3
0.47uF
GND
CPU Output port
*The receiving photoresponse changes depending on the distance from the diameter,
the material, and the case to IC of the sensor window etc.
Therefore, the optimum setting is necessary for resistance and the capacity value
between 4 pin(OUT) and 3 pin(GND) according to the application.
9/22
LA0152CS
Pin Functions
Pin
No.
1
2
Pin Name
VCC
EN
Pin function
Power supply terminal.
Insert a capacitor between
this pin and ground to
prevent the influence of
noise, etc.
Enable terminal.
This pin is used to control
the IC operational state.
When this pin is low, "sleep"
state.
When this pin is high,
"active" state.
3
GND
Ground terminal.
4
OUT
Output terminal.
This pin is outputted the
linear current depending on
ambient light.
Equivalent Circuit
8KΩ
2
VCC
4
10/22
LA0152CS
Relative Output Current vs Distance
・Measuring method
hole sizeΦ
Illumination Sensor
standard light　A
metal sheet
Thickness 0.4mm
distance S
・Evaluation result
・Recommended condition
Hole size φ (optical window) = more than 2mm.
Distance from sensor to optical window = less than 2mm.
11/22
LA0152CS
Light Source Dependency
*Fluorescent light is set to “1”
Dynamic Current Range
LA0152CS
12/22
LA0152CS
Dynamic Voltage Range
13/22
LA0152CS
Differential Light Sensibility by PD Location
＜Side view＞
light
2.0
Sensor window
Plastic （black : transmission factor=0）
1.8
1.0
0.4
Board (glass epoxy)
unit：mm
IC
＜Top view＞
A
IC
B
C
D
E
Sensor window PD
A：PD is arranged at the center of the sensor window.
B～E：The position of PD was rotated.
PD location A is set to “1”
14/22
LA0152CS
Window design guide
Flat window lens design
A window lens will surely limit the viewing angle of the LA0152CS. The window lens should be placed
directly on top of the LA0152CS. The thickness of the lens should be kept at minimum to minimize loss of
power due to reflection and also to minimize loss of loss due to absorption of energy in the plastic material.
A thickness of T = 1 mm is recommended for a window lens design.
Window with light pipe design
If a smaller window is desired while maintaining a wide effective viewing angle of the LA0152CS, a
cylindrical piece of transparent plastic is needed to trap the light and then focus and guide the light on to
the LA0152CS. Hence the name light guide or also known as light pipe. The pipe should be placed
directly on top of the LA0152CS with a distance of Z = 0.5mm to achieve peak performance. The light pipe
should have minimum of 1.5mm in diameter to ensure that whole area of the sensor will be exposed.
D1
D2
Light Pipe
D1
T
Top view
Window Lens
T
Z
L
WD
WD
PD
Z
LA0152CS
0.42
LA0152CS
0.68
Side view
FLAT WINDOW LENS
WD
(T+L+Z)
1.5
2.0
2.5
3.0
WINDOW WITH LIGHT PIPE
FLAT WINDOW LENS
(L=0.0)
Z
D1
0.5
2.0
1.0
3.0
1.5
4.0
2
5.0
WINDOW WITH LIGHT PIPE
(D2=1.5, Z=0.5)
D1
L
2.5
1.5
*All dimensions are in mm.
*These dimensions are based on a window lens thickness of 1.0mm and a refractive index of 1.59.
WD: Distance between window front panel and LA0152CS
D1: Window diameter, T: Thickness, L: Length of light pipe
D2: Light pipe diameter, Z: Distance between window rear panel and LA0152CS
15/22
LA0152CS
Evaluation Board Manual
<Evaluation Board>
Evaluation Board
Photo Diode
IC1
4pin
OUT
C1
0.1μＦ
R1
33KΩ
1pin
VCC
2pin
EN
3pin
GND
Monitoring
or
To CPU AD port
EN
Low
High
State
Sleep
Active
16/22
LA0152CS
LIGHT
SOURCE
ILLUMINANCE
METER
GND
OUT
VCC
EN
01.3200 V DC
MULTIMETER
POWER SUPPLY
Test Procedure:
1. Connect the test setup as shown above.
2. Connect IC power supply (2.2V to 5.5V) between VCC and GND.
3. Connect multimeter between OUT and GND.
4. Irradiate a light, and put on the illuminance meter near the IC.
5. Control the light source and to be adjusted 500 lux.
6. Then , OUT terminal of LA0152CS is outputted roughly 40uA. Therefore, multimeter is showed
roughly 1.32V. (1.32V = 40uA×33kΩ）
LA0152CS features:
・No sensibility in infrared area.
・Less difference in sensibility depending on the type of light source.
(Please see to page 12 “Light Source Dependency”.)
17/22
LA0152CS
Evaluation Board Circuit Diagram
VCC
1
4
OUT
0.1uF
33KΩ
2
3
GND
LA0152CS
EN
Bill of Materials for LA0152CS Evaluation Board
Designator
Quantity
IC1
1
R1
C1
1
1
Description
Value
Tolerance
Ambient
Light Sensor
OUT (to
GND)
VCC Bypass
Capacitor
33k
(0.063W)
0.1uF
/16V
±5％
±10％
Footprint
ODCSP4
(0.5mm ,pitch)
1005
(0402Inch)
1005
(0402Inch)
Manufacturer Part
Number
Substitution
Allowed
Lead
Free
SANYO
LA0152CS
No
yes
ROHM
MCR01MZPJ333
yes
yes
MURATA
GRM155B11C104KA
yes
yes
Manufacturer
Evaluation Board PCB Design
(Top View )
IC1
R1
C1
( Pattern )
( Resist )
( Silk )
Pdmax - Ta
18/22
LA0152CS
Packing Specification of Embossed Carrier Taping
19/22
LA0152CS
20/22
LA0152CS
21/22
LA0152CS
Lineup of Ambient Light Sensor by SANYO
Product name
LA0151CS
LA0152CS
LV0111CF
LV0104CS
Output type
Linear current
Linear current
Logarithm current
16bitAD digital
Overall size(mm)
1.01*1.01*0.6
1.01*1.01*0.6
1.08*1.08*0.6
1.08*1.08*0.6
Spectral characteristics
Normal
Normal
Closer to visibility
Closer to visibility
Gain switching
○
―
―
○
Standby function
―
○
○
○
Operating voltage (V)
2.2～5.5
2.2～5.5
2.3～5.5
2.3～3.6
Operating temperature range
(°C)
-30～85
-30～85
-30～85
-30～85
Consumption current 1000 lx
150uA
150uA
75uA
70uA
Output current 100 lx
8uA
8uA
20uA
100 counts
Output current 1000 lx
80uA
80uA
30uA
1000 counts
Peak sensitivity (nm)
550
550
550
550
D range
1～100k lx
1～100k lx
1～100k lx
1～65k lx
Pb free
○
○
○
○
Halogen free
-
○
○
○
Status
Mass production
Mass production
Mass production
Sep.2012 MP
LV0111CF/LV0104CS
LV0101CF / LV0104CS
1
1
0.9
0.9
0.8
0.8
Relative sensitivity
Relative sensitivity
LA0151CS/LA0152CS
LA0151CS / LA0152CS
0.7
0.6
0.5
0.4
0.3
0.7
0.6
0.5
0.4
0.3
0.2
0.2
0.1
0.1
0
0
300
400
500
600
700
800
wave length λ （nm）
LA0151/52CS
Human eye
900
1000
300
400
500
600
700
800
900
1000
wave length λ （nm）
LV0101CF/04CS
Human eye
This catalog provides information as of February, 2012. Specifications and information herein are subject
to change without notice.
22/22