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APDS-9901 Datasheet Preview

APDS-9901 Datasheet

Digital Proximity and Ambient Light Sensor

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APDS-9901 pdf
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



AVAGO
AVAGO

APDS-9901 Datasheet Preview

APDS-9901 Datasheet

Digital Proximity and Ambient Light Sensor

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APDS-9901 pdf
Functional Block Diagram
VDD
Ch0
Ch1
ALS
ADC
Data
Prox
Detect
Data
LED A ADC
Prox IR
LED
LED Regulated
Constant Current
Sink
Control
Logic
LED K LDR
Upper Threshold
Lower Threshold
Upper Threshold
Lower Threshold
GND
Interrupt
INT
SCL
SDA
Detailed Description
The APDS-9900/9901 light-to-digital device provides
on-chip Ch0 and Ch1 diodes, integrating amplifiers,
ADCs, accumulators, clocks, buffers, comparators, a state
machine and an I2C interface. Each device combines one
Ch0 photodiode (visible plus infrared) and one Ch1 infra-
red-responding (IR) photodiode. Two integrating ADCs si-
multaneously convert the amplified photodiode currents
to a digital value providing up to 16-bits of resolution.
Upon completion of the conversion cycle, the conversion
result is transferred to the Ch0 and CH1 data registers. This
digital output can be read by a microprocessor where the
illuminance (ambient light level) in Lux is derived using an
empirical formula to approximate the human eye response.
Communication to the device is accomplished through a
fast (up to 400 kHz), two-wire I2C serial bus for easy con-
nection to a microcontroller or embedded controller. The
digital output of the APDS-9900/9901 device is inherent-
ly more immune to noise when compared to an analog
interface.
The APDS-9900/9901 provides a separate pin for level-style
interrupts. When interrupts are enabled and a pre-set
value is exceeded, the interrupt pin is asserted and
remains asserted until cleared by the controlling firmware.
The interrupt feature simplifies and improves system
efficiency by eliminating the need to poll a sensor for a
light intensity or proximity value. An interrupt is generated
when the value of an ALS or proximity conversion exceeds
either an upper or lower threshold. Additionally, a pro-
grammable interrupt persistence feature allows the user
to determine how many consecutive exceeded thresholds
are necessary to trigger an interrupt. Interrupt thresholds
and persistence settings are configured independently for
both ALS and proximity.
Proximity detection is fully provided with an 850 nm IR
LED. An internal LED driver (LDR) pin, is jumper connected
to the LED cathode (LED K) to provide a factory calibrated
proximity of 100 +/- 20 mm. This is accomplished with a
proprietary current calibration technique that accounts
for all variances in silicon, optics, package and most impor-
tantly IR LED output power. This will eliminate or greatly
reduce the need for factory calibration that is required for
most discrete proximity sensor solutions. While the APDS-
9900/9901 is factory calibrated at a given pulse count,
the number of proximity LED pulses can be programmed
from 1 to 255 pulses, which will allow greater proximity
distances to be achieved. Each pulse has a 16 µs period.
2


Part Number APDS-9901
Description Digital Proximity and Ambient Light Sensor
Maker AVAGO
Total Page 28 Pages
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