Ambient Light Sensor with Dark Current Compensation

NOA1211
Ambient Light Sensor with
Dark Current Compensation
Description
The NOA1211 is a very low power ambient light sensor (ALS) with
an analog current output and a power down mode to conserve power.
Designed primarily for handheld device applications, the active power
dissipation of this chip is less than 8 mA at dark and its quiescent
current consumption is less than 200 pA in power down mode. The
device can operate over a very wide range of voltages from 2 V to
5.5 V. The NOA1211 employs proprietary CMOS image sensing
technology from ON Semiconductor, including built−in dynamic dark
current compensation to provide large signal to noise ratio (SNR) and
wide dynamic range (DR) over the entire operating temperature range.
The photopic optical filter provides a light response similar to that of
the human eye. Together the photopic light response and dark current
compensation insures accurate light level detection.
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CUDFN6
CU SUFFIX
CASE 505AE
PIN ASSIGNMENT
Features
• Senses Ambient Light and Provides an Output Current Proportional
•
•
•
•
•
•
•
•
•
•
•
•
to the Ambient Light Intensity
Photopic Spectral Response
Dynamic Dark Current Compensation
Two Selectable Output Current Gain Modes
Power Down Mode
Less than 18 mA at 100 lux Active Power Consumption in Normal
Operation (Less than 8 mA at Dark)
Less than 200 pA Quiescent Power Dissipation in Power Down
Mode at All Light Levels
Linear Response Over the Full Operating Range
Senses Intensity of Ambient Light from ~0 lux to Over 100,000 lux
Wide Operating Voltage Range (2 V to 5.5 V)
Wide Operating Temperature Range (−40°C to 85°C)
Drop−in Replacement Device in 1.6 x 1.6 mm Package
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Applications
♦
♦
♦
♦
♦
♦
♦
Cell Phones, PDAs, MP3 players, GPS
Cameras, Video Recorders
Mobile Devices with Displays or Backlit Keypads
Laptops, Notebooks, Digital Signage
LCD TVs and Monitors, Digital Picture Frames
Automobile Dashboard Displays and Infotainment
LED Indoor/Outdoor Residential and Street Lights
© Semiconductor Components Industries, LLC, 2011
March, 2011 − Rev. 0
1
6 IOUT
VSS
2
5 NC
GB1
3
4 GB2
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NOA1211CUTAG*
CUDFN6
(Pb−Free)
2500 /
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
*Temperature Range: −40°C to 85°C.
Vin = 2 to 5.5V
PDB
VDD
hn
• Saves display power in applications such as:
VDD
C1
1m
GB2
GB2GB1
GB1
Photo Amp
Diode
ADC
IOUT
RL
VSS
CL
IC2
NOA1211
IC1
Figure 1. Typical Application Circuit
1
Publication Order Number:
NOA1211/D
NOA1211
PDB
‘0’
GB2
GB1
Amp
VOUT
IOUT
hn
RL
Photo
Diode
Reference
Diode
Figure 2. Simplified Block Diagram Configured for M−Gain and Power−Down
Table 1. PIN FUNCTION DESCRIPTION
Pin
Pin Name
Description
1
VDD
Power pin.
2
VSS
Ground pin.
3
GB1
In conjunction with GB2, selects between two gain modes and power down.
4
GB2
In conjunction with GB1, selects between two gain modes and power down.
5
NC
Not connected. This may be connected to ground or left floating.
6
IOUT
Analog current output.
EP
VSS
Exposed pad, internally connected to ground. Should be connected to ground.
Table 2. ABSOLUTE MAXIMUM RATINGS
Symbol
Value
Unit
Input power supply
Rating
VDD
6
V
Input voltage range
VIN
−0.3 to VDD + 0.3
V
Output voltage range
VOUT
−0.3 to VDD + 0.2
V
Output current range
Io
0 to 15
mA
TJ(max)
−40 to 85
°C
Maximum Junction Temperature
Storage Temperature
TSTG
−40 to 85
°C
ESD Capability, Human Body Model (Note 1)
ESDHBM
2
kV
ESD Capability, Charged Device Model (Note 1)
ESDCDM
750
V
ESD Capability, Machine Model (Note 1)
ESDMM
150
V
Moisture Sensitivity Level
MSL
5
−
Lead Temperature Soldering (Note 2)
TSLD
260
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per EIA/JESD22−A114
ESD Charged Device Model tested per ESD−STM5.3.1−1999
ESD Machine Model tested per EIA/JESD22−A115
Latchup Current Maximum Rating: v 100 mA per JEDEC standard: JESD78
2. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D
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2
NOA1211
Table 3. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over VDD = 5.5 V, −40°C <
TA < 85°C)
Rating
Test Conditions
Power supply voltage
Symbol
Min
Typ
Max
Unit
VDD
2
3.0
5.5
V
IDD_0
6
8
12
mA
13
14
18
mA
0.2
5
nA
Power supply current
VDD = 3.0 V, Ev = 0 lux, M−Gain
Power supply current
VDD = 3.0 V, Ev = 100 lux, M−Gain
IDD_100
Power down current
All light levels
IDD_PD
Output current, medium−gain
Ev = 100 lux, white LED
Io_med
2.66
5.2
7.98
mA
Output current, low−gain
Ev = 100 lux, white LED
Io_low
0.266
0.52
0.798
mA
Dark output current, medium−gain
VDD = 3.0 V, Ev = 0 lux
Io_dark
1
nA
lm
540
nm
Wavelength of maximum response
White LED/fluorescent current
ratio
Ev = 100 lux
rLF
1.0
Incandescent/fluorescent current
ratio
Ev = 100 lux
rIF
1.45
Maximum output voltage
Ev = 100 lux, RL = 220 kW, M−Gain
Power down time
Wake up time
VOMAX
VDD–0.4
Ev = 100 lux, M−Gain to PD
tPD
1.5
Ev = 100 lux, PD to M−Gain
twu
VDD–0.1
VDD
V
ms
300
ms
Low level input voltage
VIL
−0.2
0.25
VDD
V
High level input voltage
VIH
0.75
VDD
VDD +
0.2
V
Operating free−air temperature
range
TA
−40
85
°C
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NOA1211
TYPICAL CHARACTERISTICS
OUTPUT CURRENT (Normalized)
1.0
ALS
Human Eye
0.9
0.8
Fluorescent
(5000K)
0.7
White LED
(5600K)
0.6
0.5
Fluorescent
(2700K)
0.4
0.3
0.2
Incandescent
(2850K)
0.1
0
200
300
400
500
600
700
800
WAVELENGTH (nm)
900
1000
0
Figure 3. Spectral Response (Normalized)
OUTPUT CURRENT (mA)
1000
100
10
1
0.1
0.01
0.001
1
10
100
10
VDD = 3.3 V
100 1000 10000 100000 1000000
Ev (lux)
Figure 5. Output Current vs. Ev
1
1
100
1000
Ev (lux)
10000 100000
6
White LED (5600K)
White LED (5600K)
50
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
10
Figure 6. Output Current vs. Ev (Medium Gain)
60
40
30
20
10
0
2
No Load
1 kW Load
10 kW Load
100 kW Load
1000
Medium Gain
Low Gain
0.0001
0.1
1.5
10000
VDD = 3.3 V
0.00001
0.01
1
Ratio
Figure 4. Light Source Dependency (Normalized to
Flouroscent Light, Medium Gain Mode)
OUTPUT CURRENT (mA)
10000
0.5
0
200
400
600
Ev (lux)
800
5
4
3
2
1
0
1000
0
20
40
60
80
Ev (lux)
Figure 7. Output Current vs. Ev, 0−1000 lux
(Medium Gain Mode)
Figure 8. Output Current vs. Ev, 0−100 lux
(Medium Gain Mode)
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4
100
NOA1211
TYPICAL CHARACTERISTICS
−60
−70
−80
−90
50
−60
60
−70
70
−80
80
−90
90
−100
110
−120
130
−140
−150
−160
140
−170
180
170
160
150
1
6
2
5
3
4
90o
OUTPUT CURRENT (Normalized to 20C)
OUTPUT CURRENT (nA)
0.5
0.4
0.3
0.2
0.1
−20
0
20
40
TEMPERATURE (°C)
60
80
100
180
170
160
SIDE VIEW
o
−90
90o
TOP VIEW
1.0
0.8
0.6
0.4
0.0
−60
16
14
6
12
5
4
−40
−20
0
20
40
TEMPERATURE (°C)
60
80
100
8
6
2
4
1
2
80
VDD = 3.3 V
10
3
60
Medium Gain Mode
Low Gain Mode
0.2
18
0
20
40
TEMPERATURE (°C)
120
130
140
150
1.2
7
−20
Q
VDD = 3.3 V
1.4
8
−40
90
1.6
20
VDD = 3.3 V
0
−60
80
Figure 12. Output Current at 100 lux vs.
Temperature (Medium Gain)
IDD (mA)
IDD (mA)
9
70
110
Figure 11. Output Current at 0 lux vs.
Temperature (Medium Gain)
10
60
Figure 10. Output Current vs. Angle (End View,
Normalized, Medium Gain Mode)
VDD = 3.3 V
−40
50
TOP VIEW
0.7
0.0
−60
40
100
−130
−140
−150
−160
−170
Figure 9. Output Current vs. Angle (End View,
Normalized, Medium Gain Mode)
0.6
30
−120
END VIEW
−90o
20
−110
Q
120
−130
10
−100
100
−110
0
4
−50
−40
−50
40
−30
−101.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
5
−40
30
−20
3
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
20
6
10
2
0
1
−30
−101.0
−20
0
−60
100
Figure 13. Supply Current at 0 lux vs.
Temperature (Medium Gain)
−40
−20
0
20
40
TEMPERATURE (°C)
60
80
Figure 14. Supply Current at 100 lux vs.
Temperature (Medium Gain)
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5
100
NOA1211
80
1.4
70
SUPPLY CURRENT (mA)
1.6
1.2
1.0
0.8
0.6
0.4
0.0
White LED (5600K)
60
50
40
30
20
10
0.2
0
1
2
3
4
5
0
6
0
200
VDD (V)
Figure 15. Output Current at 100 lux vs. Supply
Voltage (Medium Gain)
400
600
Lux (Ev)
14
12
10
8
6
4
2
0
0
1
2
800
1000
Figure 16. Supply Current vs. Ev (Medium Gain)
16
SUPPLY CURRENT (mA)
OUTPUT CURRENT (Normalized)
TYPICAL CHARACTERISTICS
3
VDD (V)
4
5
Figure 17. Supply Current vs. Supply Voltage
(Medium Gain)
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6
6
NOA1211
DESCRIPTION OF OPERATION
Ambient Light Sensor Architecture
transmits photons in the visible spectrum which are
primarily detected by the human eye and exhibits excellent
IR rejection. The photo response of this sensor is as shown
in Figure 3.
The ambient light signal detected by the photo diode is
converted to an analog output current by an amplifier with
programmable gain. Table 4 shows the gain setting and the
corresponding light sensitivity.
The NOA1211 employs a sensitive photo diode fabricated
in ON Semiconductor’s standard CMOS process
technology. The major components of this sensor are as
shown in Figure 2 . The photons which are to be detected
pass through an ON Semiconductor proprietary color filter
limiting extraneous photons and thus performing as a band
pass filter on the incident wave front. The filter only
Table 4. PROGRAMMABLE GAIN SETTINGS
GB2
GB1
Mode
Output Current @ 100 lux
Output Current @ 1000 lux
Saturation
0
0
Power Down
−
−
−
1
0
Medium Gain
5.2 mA
52 mA
~100,000 lux
1
1
Low Gain
0.52 mA
5.26 mA
> 100,000 lux
Power Down Mode
maximum desired EV as shown in Equation 3. Equation 4
computes the value for RL (Medium−Gain mode).
V OMAX + ǒ5.2 mAń100 luxǓ * E VMAX * R L (eq. 3)
This device can be placed in a power down mode by
setting GB1 and GB2 to logic low level.
In order for proper operation of this mode GB1 and GB2
should stay low 1.5 ms.
R L + ǒV DD * 0.4 VǓńE VMAX * ǒ100 luxń5.2 mAǓ
(eq. 4)
For example, consider a 5 V supply with a desired EVMAX
= 1000 lux, the value of RL would be 88.5 kW. The value for
RL can easily be computed for different NOA1211 gain
ranges by substituting the appropriate output current at
100 lux from Table 4.
The optional capacitor CL can be used to form a low−pass
filter to remove 50/60 Hz filter or other unwanted noise
sources as computed with Equation 5.
External Component Selection
The NOA1211 outputs a current in direct response to the
incident illumination. In many applications it is desirable to
convert the output current into voltage. It may also be
desirable to filter the effects of 50/60 Hz flicker or other light
source transients.
Conversion from current to voltage may be accomplished
by adding load resistor RL to the output. The value of RL is
bounded on the high side by the potential output saturation
of the amplifier at high ambient light levels. RL is bounded
on the low side by the output current limiting of the internal
amplifier and to minimize power consumption.
Equation 1 describes the relationship of light input to
current output for the Medium−Gain mode.
(eq. 1)
I OUT + ǒ5.2 mAń100 luxǓ * E V
C L + 1ń2p f c R L
(eq. 5)
For our example, to filter out 60Hz flicker the value of CL
would be 30 nF.
Power Supply Bypassing and Printed Circuit Board
Design
Power supply bypass and decoupling can typically be
handled with a low cost 0.1 mF to 1.0 mF capacitor.
The exposed pad on the bottom of the package is internally
connected to VSS pin 2 and should be soldered to the printed
circuit board.
By adding RL to the output, IOUT is converted into a
voltage according to Equation 2.
V OUT + I OUT * R L + ǒ5.2 mAń100 luxǓ * E V * R L (eq. 2)
The range of the output voltage is limited by the output
stage to the VOMAX parameter value of VDD – 0.4 V at the
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7
NOA1211
PACKAGE DIMENSIONS
CUDFN6, 1.6x1.6
CASE 505AE−01
ISSUE B
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED TERMINAL AND
IS MEASURED BETWEEN 0.15 AND 0.30mm FROM
THE TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED PAD AS
WELL AS THE TERMINALS.
0.10 C
2X
D
6
A B
4
2X
q
0.10 C
d
E
DIM
A
A1
A3
b
D
d
D2
E
E2
e
K
L
q
A
1
3
A1
TOP VIEW
DETAIL A
DETAIL A
0.08 C
A3
0.05 C
NOTE 4
C
SIDE VIEW
0.10
SEATING
PLANE
END VIEW
MOUNTING FOOTPRINT
6X
1.20
C A B
M
MILLIMETERS
MIN
MAX
0.55
0.65
0.00
0.05
0.20 REF
0.15
0.25
1.60 BSC
--0.10
1.00
1.20
1.60 BSC
0.40
0.60
0.50 BSC
0.20
--0.25
0.35
45
105
0.52
D2
1
3
0.60
E2
K
0.10
6X
6
L
4
e
BOTTOM VIEW
6X
M
1.90
C A B
1
b
0.10
M
C A
0.05
M
C
0.50
PITCH
B
NOTE 3
6X
0.25
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
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NOA1211/D
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