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PDF NOA1305 Data sheet ( Hoja de datos )
| Número de pieza | NOA1305 | |
| Descripción | Ambient Light Sensor | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NOA1305
Ambient Light Sensor with
I2C Interface and Dark
Current Compensation
Description
The NOA1305 ambient light sensor (ALS) is designed for handheld
applications and integrates a 16−bit ADC, a 2−wire I2C digital
interface, internal clock oscillator and a power down mode. The built
in dynamic dark current compensation and precision calibration
capability coupled with 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 NOA1305 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. The optical filter used with this
chip provides a light response similar to that of the human eye.
Features
• Senses Ambient Light and Provides an Output Count Proportional to
the Ambient Light Intensity
• Photopic Spectral Response
• Dynamic Dark Current Compensation
• IR Rejection Eliminates Need for Additional IR Photodiode
• Less than 120 mA Active Power Consumption in Normal Operation
• Less than 2 mA Power Dissipation in Power Down Mode
• Interrupt Signal Notifies Host of Significant Intensity Changes
• 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 0.165 Lux to Over 100K Lux
• 8 Selectable Integration Times Ranging from 6.25 ms to 800 ms
• No External Components Required
• Built−in 16−bit ADC
• I2C Serial Communication Port Supports Standard and Fast Modes
• Metal Mask Programmable I2C Slave Address Option Available
• These Devices are Pb−Free and are RoHS Compliant
Applications
• Saves Display Power In Applications Such As:
♦ Cell Phones, PDAs, MP3 Players, GPS
♦ Cameras, Video Recorders
♦ Mobile Devices with Displays or Backlit Keypads
http://onsemi.com
CUDFN6
CU SUFFIX
CASE 505AD
PIN ASSIGNMENT
VSS
NC
SCL
1
2
3
6
VDD
5
INT
4
SDA
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NOA1305CUTAG CUDFN6
(Pb−Free)
2500 / Tape &
Reel
Temperature Range
−40°C to 85°C
†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.
© Semiconductor Components Industries, LLC, 2012
October, 2012 − Rev. 0
1
Publication Order Number:
NOA1305/D
1 page  
NOA1305
TYPICAL CHARACTERISTICS
1.0
0.9
ALS
Human Eye
Fluorescent
(5000K)
0.8
0.7 White LED
0.6 (5600K)
0.5
0.4
Fluorescent
(2700K)
0.3
0.2 Incandescent
0.1 (2850K)
0
200 300 400 500 600 700 800 900 1000
0
0.5 1.0 1.5 2.0
WAVELENGTH (nm)
RATIO
Figure 4. Spectral Response
Figure 5. Illumination Response to Various
Light Sources
2000
1600
White LED (5600K)
1.2
1.0
1200
800
400
0.8
0.6
0.4
VDD = 3.3 V
0.2
0
0 200 400 600 800 1000 1200
Ev (lux)
Figure 6. Output Counts vs. Ev
0
−60 −40 −20
0
20 40 60 80 100
TEMPERATURE (°C)
Figure 7. Output Counts vs. Temperature
(100 lux)
−20 −101.0
−30 0.9
−40 0.8
−50
0.7
0.6
−60 0.5
−70
0.4
0.3
−80 0.2
0.1
−90 0.0
0
10 20 30
40
50
60
70
80
90
−100
100
−110
110 Q
−120
120
−130
130
−140
140
−150
−160
−170
180
150
170 160
END VIEW
−90o 1
2
6 90o
5
34
TOP VIEW
−10
−20 1.0
−30
−40 0.8
−50
−60
0.6
−70 0.4
0
10 20
30
40
50
60
70
−80 0.2
80
−90 0.0
90
−100
100
−110
110
−120
120
−130
130
−140
140
−150
150
−160−170 180 170 160
Q
SIDE VIEW
−90o 90o
TOP VIEW
Figure 8. Output Counts vs. Angle
(End View, Normalized)
Figure 9. Output Counts vs. Angle
(Side View, Normalized)
http://onsemi.com
5
5 Page 
NOA1305
equal to the threshold (and provided the INT pin is enabled,
see INT_SELECT register).
Changing the INT_THRESH register value can cause the
INT pin to change immediately if the ALS_DATA to
INT_THRESH comparison changes.
Powering down the device will cause the INT pin to
become inactive.
To program a value into the INT_THRESH register, use
the following write command sequence:
1. Issue Start command
2. Issue 0x72 (lower seven bits of I2C slave address
0x39 followed by write−bit 0)
3. Issue 0x04 for the INT_THRES_LSB register
address
4. Issue the 8−bit LSB value
5. Issue Stop command
6. Issue Start command
7. Issue 0x72 (lower seven bits of I2C slave address
0x39 followed by write−bit 0)
8. Issue 0x05 for the INT_THRES_MSB register
address
9. Issue the 8−bit MSB value
10. Issue Stop command
After a power−down and power−on sequence, wait at least
three integration times for the data to stabilize, before
accessing any ALS_DATA values from NOA1305.
ALS_DATA_LSB and ALS_DATA_MSB Registers
(0x06, 0x07)
The ALS_DATA register holds the ambient light intensity
count from the most recent measurement. The ALS_DATA
register is 16−bits wide and is accessed from the I2C bus as
two 8−bit registers for the least and most significant bits
(LSB and MSB).
To read the ALS_DATA register, use the following read
command sequence:
1. Issue Start command
2. Issue 0x72 (lower seven bits of I2C slave address
0x39 followed by write−bit 0)
3. Issue 0x06 for the INT_DATA_LSB register
address
4. Issue Start command
5. Issue 0x73 (lower seven bits of I2C slave address
0x39 followed by read−bit 1)
6. Read the ALS_DATA_LSB byte
7. Read the ALS_DATA_MSB byte
8. Issue Stop command
DEVICE_ID_LSB and DEVICE_ID_MSB Registers
(0x08, 0x09)
The DEVICE_ID register is a pre−programmed register
that describes the device. For the NOA1305, the register
holds the decimal value of 1305 (0x0519). The DEVICE_ID
register is 16−bits wide and is accessed from the I2C bus as
two 8−bit registers for the least and most significant bits
(LSB and MSB).
To read the DEVICE_ID register, use the following read
command sequence:
1. Issue Start command
2. Issue 0x72 (lower seven bits of I2C slave address
0x39 followed by write−bit 0)
3. Issue 0x08 for the DEVICE_ID_LSB register
address
4. Issue Start command
5. Issue 0x73 (lower seven bits of I2C slave address
0x39 followed by read−bit 1)
6. Read the DEVICE_ID_LSB byte
7. Read the DEVICE_ID_MSB byte
8. Issue Stop command
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet NOA1305.PDF ] | |
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