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PDF APDS-9901 Data sheet ( Hoja de datos )
| Número de pieza | APDS-9901 | |
| Descripción | Digital Proximity and Ambient Light Sensor | |
| Fabricantes | AVAGO | |
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APDS-9900 and APDS-9901
Digital Proximity and Ambient Light Sensor
Data Sheet
Description
The APDS-9900/9901 provides digital ambient light
sensing (ALS), IR LED and a complete proximity detection
system in a single 8 pin package. The proximity function
offers plug and play detection to 100 mm (without front
glass) thus eliminating the need for factory calibration
of the end equipment or sub-assembly. The proximity
detection feature operates well from bright sunlight
to dark rooms. The wide dynamic range also allows for
operation in short distance detection behind dark glass
such as a cell phone. In addition, an internal state machine
provides the ability to put the device into a low power
mode in between ALS and proximity measurements
providing very low average power consumption. The ALS
provides a photopic response to light intensity in very low
light condition or behind a dark faceplate.
The APDS-9900/9901 is particularly useful for display
management with the purpose of extending battery life
and providing optimum viewing in diverse lighting con-
ditions. Display panel and keyboard backlighting can
account for up to 30 to 40 percent of total platform power.
The ALS features are ideal for use in notebook PCs, LCD
monitors, flat-panel televisions, and cell phones.
The proximity function is targeted specifically towards
near field proximity applications. In cell phones, the
proximity detection can detect when the user positions
the phone close to their ear. The device is fast enough
to provide proximity information at a high repetition
rate needed when answering a phone call. This provides
both improved “green” power saving capability and the
added security to lock the computer when the user is not
present. The addition of the micro-optics lenses within
the module, provide highly efficient transmission and
reception of infrared energy which lowers overall power
dissipation.
Ordering Information
Part Number
APDS-9900
APDS-9901
Packaging
Tape & Reel
Tape & Reel
Quantity
2500 per reel
2500 per reel
Features
ALS, IR LED and Proximity Detector in an Optical Module
• Ambient Light Sensing (ALS)
– Approximates Human Eye Response
– Programmable Interrupt Function with Upper and
Lower Threshold
– Up to 16-Bit Resolution
– High Sensitivity Operates Behind Darkened Glass
– Up to 1,000,000:1 Dynamic Range
• Proximity Detection
– Fully Calibrated to 100 mm Detection
– Integrated IR LED and Synchronous LED Driver
– Eliminates “Factory Calibration” of Prox
– Covers a 2000:1 Dynamic Range
• Programmable Wait Timer
– Wait State Power – 70 µA Typical
– Programmable from 2.72 ms to > 6 Sec
• I2C Interface Compatible
– Up to 400 kHz (I2C Fast-Mode)
– Dedicated Interrupt Pin
• Sleep Mode Power - 2.5 µA Typical
• Small Package L3.94 x W2.36 x H1.35 mm
Applications
• Cell Phone Backlight Dimming
• Cell Phone Touch-screen Disable
• Notebook/Monitor Security
• Automatic Speakerphone Enable
• Automatic Menu Pop-up
• Digital Camera Eye Sensor
8 - VDD
7 - SCL
6 - GND
5 - LED A
1 - SDA
2 - INT
3 - LDR
4 - LED K
1 page  
Proximity Characteristics, VDD = 3 V, TA = 25° C, PGAIN = 1, PEN = 1 (unless otherwise noted)
Parameter
Min Typ Max Units Test Conditions
IDD Supply current – LDR Pulse On
3 mA
ADC Conversion Time Step Size
2.72 ms PTIME = 0xff
ADC Number of Integration Steps 1 steps PTIME = 0xff
Full Scale ADC Counts
1023 counts PTIME = 0xff
Proximity IR LED Pulse Count
0
255 pulses
Proximity Pulse Period
16.3 µs
Proximity Pulse – LED On Time
7.2 µs
Proximity LED Drive
100 mA PDRIVE = 0 ISINK Sink current @ 600 mV,
50 PDRIVE = 1 LDR Pin
25 PDRIVE = 2
12.5 PDRIVE = 3
Proximity ADC count value, no object
100
LED driving 8 pulses, PDRIVE = 0, open view
(no glass) and no reflective object above the
module.
Proximity ADC count value,
100 mm distance object
416 520 624 counts Reflecting object – 73 mm x 83 mm Kodak
90% grey card, 100mm distance, LED driving
8 pulses, PDRIVE = 0, open view (no glass)
above the module.
IR LED Characteristics, VDD = 3 V, TA = 25C
Parameter
Min Typ Max Units Test Conditions
Forward Voltage, VF
1.4 1.5 V
IF = 20 mA
Reverse Voltage, VR
Radiant Power, PO
5.0
4.5
V IR = 10 µA
mW IF = 20 mA
Peak Wavelength, λP
850 nm IF = 20 mA
Spectrum Width, Half Power, Δλ
Optical Rise Time, TR
40 nm IF = 20 mA
20 ns IFP = 100 mA
Optical Fall Time, TF
20 ns IFP = 100 mA
Wait Characteristics, VDD = 3 V, TA = 25° C, Gain = 16, WEN = 1 (unless otherwise noted)
Parameter
Min Typ Max Units Test Conditions
Wait Step Size
2.72 ms WTIME = 0xff
Wait Number of Step
1 256 steps
5
5 Page 
Optical Design Considerations
The APDS-9900/9901 simplifies the optical system design
by eliminating the need for light pipes and improves
system optical efficiency by providing apertures and
package shielding which will reduce crosstalk when placed
in the final system. By reducing the IR LED to glass surface
crosstalk, proximity performance is greatly improved and
enables a wide range of cell phone applications utilizing
the APDS-9900/9901. The module package design has
been optimized for minimum package foot print and
short distance proximity of 100 mm typical. The spacing
between the glass surface and package top surface is
critical to controlling the crosstalk. If the package to top
surface spacing gap, window thickness and transmittance
are met, there should be no need to add additional com-
ponents (such as a barrier) between the LED and photo-
diode. Thus with some simple mechanical design imple-
mentations, the APDS-9900/9901 will perform well in the
end equipment system.
APDS-9900/9901 Module Optimized design parameters
• Window thickness, t ≤ 1.0 mm
• Air gap, g ≤ 0.5 mm
• Assuming window IR transmittance 90%
The APDS-9900/9901 is available in a low profile package
that contains optics which provides optical gain on botht
the LED and the sensor side of the package. The device has
a package Z height of 1.35 mm and will support air gap
of < = 0.5 mm between the glass and the package. The
assumption of the optical system level design is that glass
surface above the module is < = to 1.0 mm.
By integrating the micro-optics in the package, the IR
energy emitted can be reduced thus conserving the
precious battery life in the application.
The system designer has the ability to optimize their
designs for slim form factor Z height as well as improve
the proximity sensing, save battery power and disable the
touch screen in a cellular phone.
Plastic/Glass Window
Figure 10. Proximity Detection
APDS-9900/9901
Windows Thickness, t
Air Gap, g
1200
6P (100mA)
1000 8P (100mA)
800 4P (100mA)
16P (100mA)
600 8P (50mA)
400
200
0
0 2 4 6 8 10 12 14 16
DISTANCE (cm)
Figure 11a. PS Output vs. Distance, at Various Pulse number (LED drive
Current). No glass in front of the module, 18% Kodak Grey Card.
1200
4P (100mA)
1000
6P (100mA)
8P (100mA)
16P (100mA)
800 8P (50mA)
600
400
200
0
0 2 4 6 8 10 12 14 16 18 20
DISTANCE (cm)
Figure 11b. PS Output vs. Distance, at Various Pulse number (LED drive
Current). No glass in front of the module, 90% Kodak Grey Card.
11
11 Page | ||
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| PDF Descargar | [ Datasheet APDS-9901.PDF ] | |
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