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NOA1312
Product Preview
High-Precision Ambient
Light Sensor with Three I2C
Slave Addresses, EEPROM
and Dark Current
Compensation
Description
The NOA1312 high−precision ambient light sensor (ALS) is
designed for very high accuracy (better than ±5% tolerance) handheld
applications. The device integrates a 16−bit ADC, a 2−wire I2C digital
interface with three pin−selectable I2C slave addresses, internal clock
oscillator, EEPROM and a power down mode. A photopic optical color
filter together with built in dynamic dark current compensation and
precision calibration capability plus excellent IR and 50/60 Hz flicker
rejection enables highly accurate measurements from very low light
levels to full sunlight. The device can support simple count equals lux
readings in interrupt−driven or polling modes. The NOA1312
employs proprietary CMOS image sensing technology from
ON Semiconductor to provide large signal to noise ratio (SNR) and
wide dynamic range (DR) over the entire operating temperature range.
Features
• Senses Ambient Light and Provides an Output Count Proportional to
the Ambient Light Intensity
• Human Eye Spectral Response using Photopic Optical Filter
• Dynamic Dark Current Compensation
• Very High Accuracy (better than ±5% tolerance)
• Ev Sensitivity of 5.2 Counts/lux
• Three I2C Slave Addresses (0x29, 0x39 and 0x49), Pin Selectable
• Less than 240 mA Active Power Consumption in Normal Operation
• Ultra−low Quiescent Power Dissipation, less than 100 nA in Power
Down Mode (below 50°C)
• Interrupt Signal Notifies Host of Significant Intensity Changes
• Internal EEPROM Stores Values to Minimize Programming Time
• Register Values Preserved during Power−down Mode
• Wide Operating Voltage Range (2.4 V to 3.6 V)
• Wide Operating Temperature Range (−40°C to 85°C)
• Linear Response over the Full Operating Range
• Senses Intensity of Ambient Light from 0.096 lux to Full Sunlight
• Programmable Integration Times
• No External Components Required
• Built−in 16−bit ADC
• I2C Serial Communication Port Supports Standard and Fast Modes
• This Device is Pb−Free, Halogen Free/BFR Free, and RoHS
Compliant
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
CUDFN6
CU SUFFIX
CASE 505AD
PIN ASSIGNMENT
VSS
INT
SCL
1
VDD
AD
SDA
(Top View)
ORDERING INFORMATION
Device
NOA1312CUTAG
Package
CUDFN6
(Pb−Free)
Shipping†
2500 / Tape &
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Applications
• Saves Display Power in Applications such as:
− Tablets, LED Backlit Displays,
Smart Phones, Netbooks, PDAs,
MP3 Players, GPS
− Video Recorders
© Semiconductor Components Industries, LLC, 2011
November, 2011 − Rev. P0
1
Publication Order Number:
NOA1312/D
NOA1312
Vin = 2.4 to 3.6 V
hv
R1 R2
1k 1k
R3
1k
MCU
C1
10 m
6 VDD
C2
0.1 m 1 VSS
SDA
SCL
4
3
INT
AD
2
5
IC1 C3
NOA1312 100 p
VDD,
NC or
VSS
SDA
SCL
INT
Cb1 Cb2 Cb3
Cbn not to exceed 250 pF
including all parasitic
Figure 1. Typical Application Circuit
capacitances
hv
ADC
I2C Interface
&
Control
SDA
SCL
INT
AD
Photo
Diode
Reference
Diode
EEPROM
&
Charge
Pump
Figure 2. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin Pin Name
Description
1
VSS
Ground pin.
2 INT Interrupt request to the host. Active−low, open drain output and requires a 1 kW pull−up resistor.
3
SCL
External I2C clock provided by the I2C master. Requires a 1 kW pull−up resistor.
4
SDA
Bi−directional data signal for communication between this device and the I2C master. Requires a 1 kW
pull−up resistor.
5 AD I2C slave addresses select pin. Selects one of three I2C slave addresses (0x29, 0x39 or 0x49) depend-
ing on if this pin is connected to VDD, NC (open) or VSS at power up. This is not a programmable input,
the connection should not be changed after power up.
6
VDD
Power pin.
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input power supply
VDD
4.0 V
Input voltage range
Output voltage range
Digital output current
Operating Free−Air Temperature Range
Storage Temperature
ESD Capability, Human Body Model (Note 1)
ESD Capability, Charged Device Model (Note 1)
ESD Capability, Machine Model (Note 1)
Moisture Sensitivity Level
Vin
Vout
Io
TA
TSTG
ESDHBM
ESDCDM
ESDMM
MSL
−0.2 to VDD + 0.2
−0.2 to VDD + 0.2
−10 to 10
−40 to 85
−45 to 85
2,000
750 (corner pins), 500 (center pins)
200
5
V
V
mA
°C
°C
V
V
V
−
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: ≤ 100 mA per JEDEC standard: JESD78
2. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D
http://onsemi.com
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