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ON Semiconductor |
NOA3302
Digital Proximity Sensor
with Ambient Light Sensor
and Interrupt
Description
The NOA3302 combines an advanced digital proximity sensor and
LED driver with an ambient light sensor (ALS) and tri−mode I2C
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interface with interrupt capability in an integrated monolithic device.
Multiple power management features and very low active sensing
power consumption directly address the power requirements of battery
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operated mobile phones and mobile internet devices.
The proximity sensor measures reflected light intensity with a high
degree of precision and excellent ambient light rejection. The
CWDFN8
CU SUFFIX
CASE 505AJ
NOA3302 enables a proximity sensor system with a 32:1
programmable LED drive current range and a 30 dB overall proximity
PIN CONNECTIONS
detection threshold range. The photopic light response, dark current
compensation and high sensitivity of the ambient light sensor
VDD 1
8 SCL
eliminates inaccurate light level detection, insuring proper backlight
control even in the presence of dark cover glass.
VSS 2
7 SDA
The NOA3302 is ideal for improving the user experience by
enhancing the screen interface with the ability to measure distance for
near/far detection in real time and the ability to respond to ambient
LED_GND 3
LED 4
6 NC
5 INT
lighting conditions to control display backlight intensity.
(Top View)
Features
• Proximity Sensor, LED driver and ALS in One Device
ORDERING INFORMATION
• Very Low Power Consumption
♦ Stand−by Current 5 mA (monitoring I2C interface only,
VDD = 3 V)
♦ ALS Operational Current 50 mA
♦ Proximity Sensing Average Operational Current 100 mA
♦ Average LED Sink Current 75 mA
Proximity Sensing
Device
Package
Shipping†
NOA3302CUTAG* CWDFN8
(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 80°C.
• Proximity Detection Distance Threshold I2C Programmable with
12−bit Resolution and Four integration Time Ranges
(15−bit effective resolution)
• Effective for Measuring Distances up to 100 mm and
• Photopic Spectral Response Nearly Matches Human Eye
Beyond
• Dynamic Dark Current Compensation
• Excellent IR and Ambient Light Rejection Including
Sunlight (up to 50k lux) and CFL Interference
• Programmable LED Drive Current from 5 mA to
160 mA in 5 mA steps, No External Resistor Required
• Linear Response Over the Full Operating Range
• Senses Intensity of Ambient Light from 0.05 lux to 52k
lux with 21−bit Effective Resolution (16−bit converter)
• Continuously Programmable Integration Times
Ambient Light Sensing
• ALS Senses Ambient Light and Provides a 16−bit
Output Count on the I2C Bus Directly Proportional to
(6.25 ms, 12.5 ms, 25 ms… to 800 ms)
• Precision on−Chip Oscillator (counts equal 0.1 lux at
100 ms integration time)
the Ambient Light Intensity
© Semiconductor Components Industries, LLC, 2013
March, 2013 − Rev. 1
1
Publication Order Number:
NOA3302/D
NOA3302
Additional Features
• Programmable interrupt function including independent
upper and lower threshold detection or threshold based
hysteresis for proximity and or ALS
• Proximity persistence feature reduces interrupts by
providing hysteresis to filter fast transients such as
camera flash
• Automatic power down after single measurement or
continuous measurements with programmable interval
time for both ALS and PS function
• Wide operating voltage range (2.3 V to 3.6 V)
• Wide operating temperature range (−40°C to 80°C)
• I2C serial communication port
♦ Standard mode – 100 kHz
VDD
♦ Fast mode – 400 kHz
♦ High speed mode – 3.4 MHz
• No external components required except the IR LED
and power supply Decoupling Caps
• 8−lead CUDFN 2.0 x 2.0 x 0.6 mm clear package
• These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Applications
• Senses human presence in terms of distance and senses
ambient light conditions, saving display power in
applications such as:
♦ Smart phones, mobile internet devices, MP3 players,
GPS
♦ Mobile device displays and backlit keypads
VDD_I2C
NOA3302
hn
ALS
Photodiode
ADC
Reference
Diode
1 mF
DSP
I2C Interface
Osc &
Control
INTB
SCL
SDA
VDD
MCU
INTB
SCL
SDA
22 mF
1 mF
ADC
hn
Proximity
Photodiode
DSP
LED
Drive
IR LED
LED
VSS
LED_GND
Figure 1. NOA3302 Application Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin Pin Name
Description
1
VDD
Power pin.
2
VSS
Ground pin.
3
LED_GND
Ground pin for IR LED driver.
4 LED IR LED output pin.
5 INT Interrupt output pin, open−drain.
6 NC Not connected.
7
SDA
Bi−directional data signal for communications with the I2C master.
8
SCL
External I2C clock supplied by the I2C master.
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