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NOA3315W Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer NOA3315W
Beschreibung Digital Proximity Sensor
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 26 Seiten
NOA3315W Datasheet, Funktion
NOA3315W
Digital Proximity Sensor
with Dual Ambient Light
Sensors and Interrupt
Description
The NOA3315W combines an advanced digital proximity sensor
and LED driver with dual ambient light sensors (ALS) and tri−mode
I2C interface with interrupt capability in an integrated monolithic
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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
NOA3315W enables a proximity sensor system with a 16:1
programmable LED drive current range and a 30 dB overall proximity
detection range. The dual ambient light sensors include one with a
photopic light filter and one with no filter. Both have dark current
AMBIENT LIGHT PROXIMITY SENSOR
compensation and high sensitivity eliminating inaccurate light level
detection and insuring proper backlight control even in the presence of
dark cover glass.
ORDERING INFORMATION
The NOA3315W 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
Device
NOA3315W
Wafer Size
200 mm wafer
Temp Range
−40°C to 80°C
lighting conditions to control display backlight intensity.
Features
Ambient Light Sensing
Proximity Sensor, LED Driver and Dual ALS in One
Dual ALS senses ambient light and provides 16−bit
Device
output counts on the I2C bus directly proportional to the
Very Low Power Consumption
Stand−by current 2.8 mA (monitoring I2C interface
ambient light intensity
Photopic Spectral Response of ALS1 Nearly Matches
only, Vdd = 3 V)
Human Eye
ALS operational current 50 mA per sensor
Broadband response of ALS2 supports compensation
Proximity sensing average operational current
100 mA
Average LED sink current 75 mA
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
for spectral shifts encountered with different types of
cover glass
Dynamic Dark Current Compensation
Linear Response over the Full Operating Range
3 ranges – 100 counts/lux, 10 counts/lux, 1 count/lux
Proximity Sensing
Senses Intensity of Ambient Light from 0.02 lux to 52k
Proximity detection distance threshold I2C
programmable with 12−bit resolution and eight
lux with 21−bit Effective Resolution (16−bit converter)
Programmable Integration Times (50 ms, 100 ms,
integration time ranges (16−bit effective resolution)
200 ms, 400 ms)
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
Additional Features
Programmable interrupt function including independent
upper and lower threshold detection or threshold based
hysteresis for proximity and or ALS
Level or Edge Triggered Interrupts
Proximity persistence feature reduces interrupts by
providing hysteresis to filter fast transients such as
camera flash
© Semiconductor Components Industries, LLC, 2015
March, 2015 − Rev. 0
1
Publication Order Number:
NOA3315W/D






NOA3315W Datasheet, Funktion
NOA3315W
Table 5. OPTICAL CHARACTERISTICS (Unless otherwise specified, these specifications are for VDD = 3.0 V, TA = 25°C)
Parameter
Symbol
Min Typ Max Unit
PROXIMITY SENSOR (Note 8)
Detection range, Tint = 300 ms, ILED = 150 mA, 860 nm IR LED (OS-
RAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1
DPS_300_WHITE_
150
74
mm
Detection range, Tint = 300 ms, ILED = 100 mA, 860 nm IR LED (OS-
RAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1
DPS_300_WHITE_
100
62
mm
Detection range, Tint = 150 ms, ILED = 100 mA, 860 nm IR LED (OS-
RAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1
DPS_150_WHITE_
100
48
mm
Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR LED (OS-
RAM SFH4650), Grey Reflector (RGB = 162, 162, 160), SNR = 6:1
DPS_1200_GREY_
100
64
mm
Detection range, Tint = 2400 ms, ILED = 150 mA, 860 nm IR LED (OS-
RAM SFH4650), Black Reflector (RGB = 16, 16, 15), SNR = 6:1
DPS_2400_BLACK_
150
36
mm
Saturation power level
PDMAX
Measurement resolution, Tint = 150 ms
MR150
Measurement resolution, Tint = 300 ms
MR300
Measurement resolution, Tint = 600 ms
MR600
Measurement resolution, Tint = 1200 ms
MR1200
Measurement resolution, Tint = 1800 ms
MR1800
Measurement resolution, Tint = 2400 ms
MR2400
Measurement resolution, Tint = 3600 ms
MR3600
Measurement resolution, Tint = 4800 ms
MR4800
7. Refer to Figure 4 for more information on spectral response.
8. Measurements performed with default modulation frequency and sample delay unless noted.
0.8
11
12
13
14
15
15
16
16
mW/cm2
bits
bits
bits
bits
bits
bits
bits
bits
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NOA3315W pdf, datenblatt
NOA3315W
and the intensity of the ambient incandescent light (in lux):
IL
+
Cnt
ǒ2900 @
TintǓ
For example let:
Cnt = 2000 counts
Tint = 50 ms
Intensity of ambient fluorescent light, IL(in lux):
IL
+
2000
ǒ2000 @ 50
msǓ
(eq. 3)
(eq. 4)
IL + 20 lux
ALS Spectral Response Correction
The ALS1 photopic filter has some IR leakage which
results in higher ALS readings for light sources with higher
IR content, such as incandescent lighting. For purely
photopic light, ALS1 is very accurate and correction is not
needed. For other light sources, or if the spectral response of
the light is shifted by cover glass, etc., the ALS reading can
be corrected by reading both ALS1 and ALS2 and applying
an equation such as
ǒ ǒ Ǔ ǓALS + ALS1 @
0.1 @
ALS1
ALS2
) 0.5
The equation shown does not work well for very low ALS1
and/or ALS2 values (a single count introduces a large
correction factor), thus it is recommended that the correction
not be applied if the ALS1 value is below 5 counts and/or the
ALS2 value is 0. Likewise if ALS1 reaches 65535 counts,
the equation will begin to be incorrect and thus should not
be applied. To provide the best possible correction, the
equation will change based on the spectral characteristics of
the glass used between the sensor and the light source. The
equation shown was chosen to provide the best fit of a
number of different light sources with no filter glass used.
I2C Interface
The NOA3315W acts as an I2C slave device and supports
single register and block register read and write operations.
All data transactions on the bus are 8 bits long. Each data
byte transmitted is followed by an acknowledge bit. Data is
transmitted with the MSB first.
Device
Address
A[6:0] WRITE
011 0111 0
0x6E
ACK
0
Register
Address
D[7:0] ACK
0000 0110 0
Register
Data
D[7:0] ACK
0000 0000 0
7 88
Start
Condition
Figure 23. I2C Write Command
Stop
Condition
Figure 23 shows an I2C write operation. Write
transactions begin with the master sending an I2C start
sequence followed by the seven bit slave address
(NOA3315W = 0x37) and the write(0) command bit. The
NOA3315W will acknowledge this byte transfer with an
appropriate ACK. Next the master will send the 8 bit register
address to be written to. Again the NOA3315W will
acknowledge reception with an ACK. Finally, the master
will begin sending 8 bit data segment(s) to be written to the
NOA3315W register bank. The NOA3315W will send an
ACK after each byte and increment the address pointer by
one in preparation for the next transfer. Write transactions
are terminated with either an I2C STOP or with another I2C
START (repeated START).
Figure 24 shows an I2C read command sent by the master
to the slave device. Read transactions begin in much the
same manner as the write transactions in that the slave
address must be sent with a write(0) command bit.
Device
Address
A[6:0] WRITE
011 0111 0
0x6E
ACK
0
Register
Address
D[7:0] ACK
0000 0110 0
Register
Data
D[7:0] ACK
0000 0000 0
7 88
Start
Condition
Stop
Condition
Device
Address
A[6:0] READ
011 0111 1
0x6F
7
ACK
0
Register
Data [A]
D[7:0] ACK
bbbb bbbb 0
Register
Data [A+1]
D[7:0] NACK
bbbb bbbb 1
88
Start
Condition
Figure 24. I2C Read Command
Stop
Condition
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