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PDF ( 数据手册 , 数据表 ) NOA2301W

零件编号 NOA2301W
描述 Digital Proximity Sensor
制造商 ON Semiconductor
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NOA2301W 数据手册, 描述, 功能
NOA2301W
Digital Proximity Sensor
with Interrupt
Description
The NOA2301W combines an advanced digital proximity sensor
and LED driver coupled with a tri−mode I2C 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 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
NOA2301W enables a proximity sensor system with a 16:1
programmable LED drive current range and a 30 dB overall proximity
detection range.
The NOA2301W 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.
www.onsemi.com
AMBIENT LIGHT PROXIMITY SENSOR
Features
Proximity Sensor and LED Driver in One Device
ORDERING INFORMATION
Proximity Detection Distance Threshold I2C Programmable with
Device
Wafer Size
Temp Range
12−bit Resolution and Eight Integration Time Ranges (16−bit
effective resolution)
NOA2301W 200 mm wafer −40°C to 80°C
Effective for Measuring Distances up to 200 mm and Beyond
Excellent IR and Ambient Light Rejection including Sunlight (up to
50K lux) and CFL Interference
Programmable LED Drive Current from 10 mA to 160 mA in 5 mA
Steps, No External Resistor Required
User Programmable LED Pulse Frequency
Very Low Power Consumption
Stand−by current 2.8 mA (monitoring I2C interface only, Vdd=3V)
Proximity sensing average operational current 100 mA
Average LED sink current 75 mA
Programmable interrupt function including independent
No External Components Required except the IR LED
and Power Supply Decoupling Caps
These Devices are Pb−Free, Halogen Free/BFR Free
upper and lower threshold detection or threshold based
hysteresis
Level or Edge Triggered Interrupts
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
Wide Operating Voltage Range (2.3 V to 3.6 V)
Wide Operating Temperature Range (−40°C to 80°C)
I2C Serial Communication Port
and are RoHS Compliant
Applications
Senses human presence in terms of distance for saving
display power and preventing inadvertent command
initiation in applications such as:
Smart phones, mobile internet devices, MP3 players,
GPS
Mobile device displays and backlit keypads
Headphone use detection
Cameras
Game controllers, media players
Contactless Switches
Standard mode – 100 kHz
Fast mode – 400 kHz
High speed mode – 3.4 MHz
Touch−less switches for light controls
Money detection, coin or paper
Sanitary switches for medical environments
© Semiconductor Components Industries, LLC, 2015
March, 2015 − Rev. 0
1
Publication Order Number:
NOA2301W/D







NOA2301W pdf, 数据表
NOA2301W
TYPICAL CHARACTERISTICS
25
20
15
10
5
0
2.0 2.5 3.0 3.5 4.0
VDD (V)
Figure 10. Supply Current vs. Supply Voltage
TINT = 300 ms, TR = 100 ms
180
160
140
120
100
80
60
40
20
0
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
VDD (V)
Figure 11. Supply Current vs. Supply Voltage
TINT = 1200 ms, TR = 50 ms
www.onsemi.com
8







NOA2301W equivalent, schematic
NOA2301W
Proximity Sensor Operation
NOA2301W operation is divided into three phases: power
up, configuration and operation. On power up the device
initiates a reset which initializes the configuration registers
to their default values and puts the device in the standby
state. At any time, the host system may initiate a software
reset by writing 0x01 to register 0x01. A software reset
performs the same function as a power−on−reset.
The configuration phase may be skipped if the default
register values are acceptable, but typically it is desirable to
change some or all of the configuration register values.
Configuration is accomplished by writing the desired
configuration values to registers 0x02 through 0x17.
Writing to configuration registers can be done with either
individual I2C byte−write commands or with one or more
I2C block write commands. Block write commands specify
the first register address and then write multiple bytes of data
in sequence. The NOA2301W automatically increments the
register address as it acknowledges each byte transfer.
Proximity sensor measurement is initiated by writing
appropriate values to the CONTROL register (0x17).
Sending an I2C_STOP sequence at the end of the write
signals the internal state machines to wake up and begin the
next measurement cycle. Figure 14 and Figure 15 illustrate
the activity of key signals during a proximity sensor
measurement cycle. The cycle begins by starting the
precision oscillator and powering up the proximity sensor
receiver. Next, the IR LED current is modulated according
to the LED current setting at the chosen LED frequency and
the values during both the on and off times of the LED are
stored (illuminated and ambient values). Finally, the
proximity reading is calculated by subtracting the ambient
value from the illuminated value and storing the result in the
16 bit PS_Data register. In One−shot mode, the PS receiver
is then powered down and the oscillator is stopped. If Repeat
mode is set, the PS receiver is powered down for the
specified interval and the process is repeated. With default
configuration values (receiver integration time = 1200 ms),
the total measurement cycle will be less than 2 ms.
I2C Stop
PS Power
4MHz Osc On
LED Burst
Integration
Data Available
50 − 200μs
9μs
0 − 100μs
~600μs
8 clks 12μs
Integration Time
Figure 14. Proximity Sensor One−Shot Timing
100 − 150μs
I2C Stop
PS Power
4MHz Osc On
LED Burst
Integration
Data Available
50 − 200μs
Interval
~600μs
8 clks 12μs
Integration Time
Figure 15. Proximity Sensor Repeat Timing
9μs
0 − 100μs
100 − 150μs
(Repeat)
www.onsemi.com
16










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