© Semiconductor Components Industries, LLC, 2013
March, 2013 − Rev. 1
1Publication Order Number:
NOA3302/D
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
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
NOA3302 enables a proximity sensor system with a 32:1
programmable LED drive current range and a 30 dB overall proximity
detection threshold range. The photopic light response, dark current
compensation and high sensitivity of the ambient light sensor
eliminates inaccurate light level detection, insuring proper backlight
control even in the presence of dark cover glass.
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
lighting conditions to control display backlight intensity.
Features
•Proximity Sensor, LED driver and ALS in One Device
•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
•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
Beyond
•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
Ambient Light Sensing
•ALS Senses Ambient Light and Provides a 16−bit
Output Count on the I2C Bus Directly Proportional to
the Ambient Light Intensity
•Photopic Spectral Response Nearly Matches Human Eye
•Dynamic Dark Current Compensation
•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
(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)
CWDFN8
CU SUFFIX
CASE 505AJ
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†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.
Device Package Shipping†
ORDERING INFORMATION
NOA3302CUTAG* CWDFN8
(Pb−Free)
2500 /
Tape & Reel
PIN CONNECTIONS
1
2
36
5
7
VDD
LED_GND
LED
SCL
SDA
NC
(Top View)
INT
VSS
4
8
1
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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
♦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
Figure 1. NOA3302 Application Block Diagram
ADC
hn
ALS
Photodiode
Reference
Diode
SDA
SCL
INTB
hn
Proximity
Photodiode
ADC
DSP
DSP
Osc &
Control
LED
VDD
VSS
IR LED
VDD
VDD_I2C
SDA
SCL
INTB
MCU
NOA3302
LED
Drive
LED_GND
1 mF
I2C Interface
1 mF
22 mF
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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Table 2. ABSOLUTE MAXIMUM RATINGS
Rating Symbol Value Unit
Input power supply VDD 4.0 V
Input voltage range Vin −0.3 to VDD + 0.2 V
Output voltage range Vout −0.3 to VDD + 0.2 V
Maximum Junction Temperature TJ(max) 100 °C
Storage Temperature TSTG −40 to 80 °C
ESD Capability, Human Body Model (Note 1) ESDHBM 2 kV
ESD Capability, Charged Device Model (Note 1) ESDCDM 500 V
ESD Capability, Machine Model (Note 1) ESDMM 200 V
Moisture Sensitivity Level MSL 3 −
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
Table 3. OPERATING RANGES
Rating Symbol Min Typ Max Unit
Power supply voltage VDD 2.3 3.6 V
Power supply current, stand−by mode (VDD = 3.0 V) IDDSTBY_3.0 5mA
Power supply current, stand−by mode (VDD = 3.6 V) IDDSTBY_3.6 10 mA
Power supply average current, ALS operating 100 ms
integration time and 500 ms intervals
IDDALS 50 mA
Power supply average current, PS operating 300 ms
integration time and 100 ms intervals
IDDPS 100 mA
LED average sink current, PS operating at 300 ms integration
time and 100 ms intervals and LED current set at 50 mA
ILED 75 mA
I2C signal voltage (Note 3) VDD_I2C 1.6 1.8 2.0 V
Low level input voltage (VDD_I2C related input levels) VIL −0.3 0.3 VDD_I2C V
High level input voltage (VDD_I2C related input levels) VIH 0.7 VDD_I2C VDD_I2C + 0.2 V
Hysteresis of Schmitt trigger inputs Vhys 0.1 VDD_I2C V
Low level output voltage (open drain) at 3 mA sink current
(INTB)
VOL 0.2 VDD_I2C V
Input current of IO pin with an input voltage between 0.1 VDD
and 0.9 VDD
II−10 10 mA
Output low current (INTB) IOL 3−mA
Operating free−air temperature range TA−40 80 °C
3. The I2C interface is functional to 3.0 V, but timing is only guaranteed up to 2.0 V. High Speed mode is guaranteed to be functional to 2.0 V.
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Table 4. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over 2.3 V < VDD < 3.3 V,
1.7 V < VDD_I2C < 1.9 V, −40°C < TA < 80°C, 10 pF < Cb < 100 pF) (See Note 4)
Parameter Symbol Min Typ Max Unit
LED pulse current ILED_pulse 5 160 mA
LED pulse current step size ILED_pulse_step 5 mA
LED pulse current accuracy ILED_acc −20 +20 %
Interval Timer Tolerance Tol f_timer −35 +35 %
SCL clock frequency fSCL_std 10 100 kHz
fSCL_fast 100 400
fSCL_hs 100 3400
Hold time for START condition. After this period,
the first clock pulse is generated.
THD;STA_std 4.0 −mS
tHD;STA_fast 0.6 −
tHD;STA_hs 0.160 −
Low period of SCL clock tLOW_std 4.7 −mS
tLOW_fast 1.3 −
tLOW_hs 0.160 −
High period of SCL clock tHIGH_std 4.0 −mS
tHIGH_fast 0.6 −
tHIGH_hs 0.060 −
SDA Data hold time tHD;DAT_d_std 0 3.45 mS
tHD;DAT_d_fast 0 0.9
tHD;DAT_d_hs 0 0.070
SDA Data set−up time tSU;DAT_std 250 −nS
tSU;DAT_fast 100 −
tSU;DAT_hs 10
Rise time of both SDA and SCL (input signals) (Note 5) tr_INPUT_std 20 1000 nS
tr_INPUT_fast 20 300
tr_INPUT_hs 10 40
Fall time of both SDA and SCL (input signals) (Note 5) tf_INPUT_std 20 300 nS
tf_INPUT_fast 20 300
tf_INPUT_hs 10 40
Rise time of SDA output signal (Note 5) tr_OUT_std 20 300 nS
tr_OUT_fast 20 + 0.1 Cb 300
tr_OUT_hs 10 80
Fall time of SDA output signal (Note 5) tf_OUT_std 20 300 nS
tf_OUT_fast 20 + 0.1 Cb 300
tf_OUT_hs 10 80
Set−up time for STOP condition tSU;STO_std 4.0 −mS
tSU;STO_fast 0.6 −
tSU;STO_hs 0.160 −
Bus free time between STOP and START condition tBUF_std 4.7 −mS
tBUF_fast 1.3 −
tBUF_hs 0.160 −
4. Refer to Figure 2 and Figure 3 for more information on AC characteristics.
5. The rise time and fall time are dependent on both the bus capacitance (Cb) and the bus pull−up resistor Rp. Max and min pull−up resistor
values are determined as follows: Rp(max) = tr (max)/(0.8473 x Cb) and Rp(min) = (Vdd_I2C – Vol(max))/Iol.
6. Cb = capacitance of one bus line, maximum value of which including all parasitic capacitances should be less than 100 pF. Bus capacitance
up to 400 pF is supported, but at relaxed timing.
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Table 4. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over 2.3 V < VDD < 3.3 V,
1.7 V < VDD_I2C < 1.9 V, −40°C < TA < 80°C, 10 pF < Cb < 100 pF) (See Note 4) (continued)
Parameter UnitMaxTypMinSymbol
Capacitive load for each bus line
(including all parasitic capacitance) (Note 6)
Cb10 100 pF
Noise margin at the low level
(for each connected device − including hysteresis)
VnL 0.1 VDD −V
Noise margin at the high level
(for each connected device − including hysteresis)
VnH 0.2 VDD −V
4. Refer to Figure 2 and Figure 3 for more information on AC characteristics.
5. The rise time and fall time are dependent on both the bus capacitance (Cb) and the bus pull−up resistor Rp. Max and min pull−up resistor
values are determined as follows: Rp(max) = tr (max)/(0.8473 x Cb) and Rp(min) = (Vdd_I2C – Vol(max))/Iol.
6. Cb = capacitance of one bus line, maximum value of which including all parasitic capacitances should be less than 100 pF. Bus capacitance
up to 400 pF is supported, but at relaxed timing.
Table 5. OPTICAL CHARACTERISTICS (Unless otherwise specified, these specifications are for VDD = 3.3 V, TA = 25°C)
Parameter Symbol Min Typ Max Unit
AMBIENT LIGHT SENSOR
Spectral response, peak (Note 7) lp560 nm
Spectral response, low −3 dB lc_low 510 nm
Spectral response, high −3 dB lc_high 610 nm
Dynamic range DRALS 0.05 52k lux
Maximum Illumination (ALS operational but saturated) Ev_Max 120k lux
Resolution, Counts per lux, Tint = 800 ms CR800 80 counts
Resolution, Counts per lux, Tint = 100 ms CR100 10 counts
Resolution, Counts per lux, Tint = 6.25 ms CR6.25 6.25 counts
Illuminance responsivity, green 560 nm LED,
Ev = 100 lux, Tint = 100 ms
Rv_g100 1000 counts
Illuminance responsivity, green 560 nm LED,
Ev = 1000 lux, Tint = 100 ms
Rv_g1000 10000 counts
Dark current, Ev = 0 lux, Tint = 100 ms Rvd 0 0 3 counts
PROXIMITY SENSOR
Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR
LED (OSRAM SFH4650), White Reflector
(RGB = 220, 224, 223), SNR = 6:1
DPS_1200_WHITE 100 mm
Detection range, Tint = 600 ms, ILED = 100 mA, 860 nm IR
LED (OSRAM SFH4650), White Reflector
(RGB = 220, 224, 223), SNR = 6:1
DPS_600_WHITE 85 mm
Detection range, Tint = 300 ms, ILED = 100 mA, 860 nm IR
LED (OSRAM SFH4650), White Reflector
(RGB = 220, 224, 223), SNR = 6:1
DPS_300_WHITE 60 mm
Detection range, Tint = 150 ms, ILED = 100 mA, 860 nm IR
LED (OSRAM SFH4650), White Reflector
(RGB = 220, 224, 223), SNR = 6:1
DPS_150_WHITE 35 mm
Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR
LED (OSRAM SFH4650), Grey Reflector
(RGB = 162, 162, 160), SNR = 6:1
DPS_1200_GREY 70 mm
Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR
LED (OSRAM SFH4650), Black Reflector
(RGB = 16, 16, 15), SNR = 6:1
DPS_1200_BLACK 35 mm
Saturation power level PDMAX 1.0 mW/cm2
Measurement resolution, Tint = 150 msMR150 12 bits
Measurement resolution, Tint = 300 msMR300 13 bits
Measurement resolution, Tint = 600 msMR600 14 bits
Measurement resolution, Tint = 1200 msMR1200 15 bits
7. Refer to Figure 4 for more information on spectral response.
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Figure 2. AC Characteristics, Standard and Fast Modes
Figure 3. AC Characteristics, High Speed Mode
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TYPICAL CHARACTERISTICS
Figure 4. ALS Spectral Response (Normalized) Figure 5. ALS Light Source Dependency
(Normalized to Fluorescent Light)
WAVELENGTH (nm) RATIO
900800700600500400300200
0
0.1
0.2
0.4
0.6
0.7
0.9
1.0
2.01.51.00.50
Figure 6. ALS Response to White Light vs. Angle Figure 7. ALS Response to IR vs. Angle
Figure 8. ALS Linearity 0−700 lux Figure 9. ALS Linearity 0−100 lux
Ev (lux) Ev (lux)
7006005004003002001000
0
1 K
2 K
3 K
4 K
6 K
7 K
8 K
807060503020100
0
200
400
600
800
1000
1200
OUTPUT CURRENT (Normalized)ALS COUNTS
ALS COUNTS
800
5 K
40 90 100 110
Incandescent
(2850K)
Fluorescent
(2700K)
White LED
(5600K)
Fluorescent
(5000K)
1000
0.3
0.5
0.8 ALS
Human Eye
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0 010 20 30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
−170
−160
−150
−140
−130
−120
−110
−100
−90
−80
−70
−60
−50
−40
−30
−20 −10
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0 010 20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
−170
−160
−150
−140
−130
−120
−110
−100
−90
−80
−70
−60
−50
−40
−30
−20 −10
Q
SIDE VIEW
TOP VIEW
−90 o90o
1
2
8
7
6
45
3
Q
SIDE VIEW
TOP VIEW
−90 o90o
1
2
8
7
6
45
3
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TYPICAL CHARACTERISTICS
Figure 10. ALS Linearity 0−10 lux Figure 11. ALS Linearity 0−2 lux
Ev (lux) Ev (lux)
108764310
0
20
40
60
100
120
2.52.01.51.00.50
0
5
10
15
20
25
Figure 12. PS Response vs. Distance and LED
Current (1200 ms Integration Time, Grey
Reflector (RGB = 162, 162, 160))
Figure 13. PS Response vs. Distance and LED
Current (300 ms Integration Time, White
Reflector (RGB = 220, 224, 223))
DISTANCE (mm) DISTANCE (mm)
140120100806040200
0
5 K
10 K
20 K
25 K
30 K
40 K
45 K
Figure 14. PS Response vs. Distance and LED
Current (300 ms Integration Time, Grey
Reflector (RGB = 162, 162, 160))
Figure 15. PS Response vs. Distance and LED
Current (300 ms Integration Time, Black
Reflector (RGB = 16, 16, 15))
DISTANCE (mm) DISTANCE (mm)
140120100806040200
0
2 K
4 K
6 K
8 K
10 K
12 K
100806040200
0
500
1500
2000
3000
3500
4000
5000
ALS COUNTS
ALS COUNTS
PROXIMITY SENSOR VALUE
PROXIMITY SENSOR VALUE
PROXIMITY SENSOR VALUE
PROXIMITY SENSOR VALUE
1000
2500
4500 20mA
60mA
100mA
160mA
160
20mA
60mA
100mA
160mA
80
25 911
160
15 K
35 K
20mA
60mA
100mA
160mA
200100 150500
0
2 K
4 K
6 K
8 K
10 K
12 K
250
20mA
60mA
100mA
160mA
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TYPICAL CHARACTERISTICS
VDD (V) VDD (V)
4.03.53.02.52.0
0
10
30
40
60
70
90
100
4.03.53.02.52.0
0
50
100
150
200
250
300
IDD (mA)
IDD (mA)
ALS
PS
ALS+PS
20
50
80
ALS
PS
ALS+PS
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0 010 20 30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
−170
−160
−150
−140
−130
−120
−110
−100
−90
−80
−70
−60
−50
−40
−30
−20−10
Q
SIDE VIEW
TOP VIEW
−90 o90o
1
2
8
7
6
45
3
TEMPERATURE (°C)
100806040200
0
0.2
0.4
0.6
0.8
1.0
1.2
ALS RESPONSE (Normalized)
100 Lux
50 Lux
20 Lux
10 Lux
5 Lux
Figure 16. PS Ambient Rejection
TINT = 300 ms, ILED = 100 mA, White Reflector
(RGB = 220, 224, 223)
Figure 17. PS Response to IR vs. Angle
Figure 18. Supply Current vs. Supply Voltage
ALS TINT = 100 ms, TR = 500 ms
PS TINT = 300 ms, TR = 100 ms
Figure 19. Supply Current vs. Supply Voltage
ALS TINT = 100 ms, TR = 500 ms
PS TINT = 1200 ms, TR = 50 ms
Figure 20. ALS Response vs. Temperature
REFLECTOR DISTANCE (mm)
PROXIMITY SENSOR VALUE
200100 150500
0
2 K
4 K
6 K
8 K
10 K
12 K
250
No Ambient
50K lux Halogen (3300K)
10K lux Incandescent (2700K)
10K lux CFL (3000K)
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DESCRIPTION OF OPERATION
Proximity Sensor Architecture
NOA3302 combines an advanced digital proximity
sensor, LED driver, ambient light sensor and a tri−mode I2C
interface as shown in Figure 1. The LED driver draws a
modulated current through the external IR LED to
illuminate the target. The LED current is programmable
over a wide range. The infrared light reflected from the
target is detected by the proximity sensor photo diode. The
proximity sensor employs a sensitive photo diode fabricated
in ON Semiconductor’s standard CMOS process
technology. The modulated light received by the on−chip
photodiode is converted to a digital signal using a variable
slope integrating ADC with a default resolution (at 300 ms)
of 13−bits, unsigned. The signal is processed to remove all
unwanted signals resulting in a highly selective response to
the generated light signal. The final value is stored in the
PS_DATA register where it can be read by the I2C interface.
Ambient Light Sensor Architecture
The ambient light sensor contained in the NOA3302
employs a second photo diode with its own proprietary
photopic filter limiting extraneous photons, and thus
performing as a band pass filter on the incident wave front.
The filter only transmits photons in the visible spectrum
which are primarily detected by the human eye. The photo
response of this sensor is as shown in Figure 4.
The ambient light signal detected by the photo diode is
converted to digital signal using a variable slope integrating
ADC with a resolution of 16−bits, unsigned. The ADC value
is stored in the ALS_DATA register where it can be read by
the I2C interface.
Equation 1 shows the relationship of output counts Cnt as
a function of integration constant Ik, integration time Tint (in
seconds) and the intensity of the ambient light, IL (in lux),
at room temperature (25°C).
IL+CntńǒIk@TintǓ(eq. 1)
Where:
Ik = 73 (for fluorescent light)
Ik = 106 (for incandescent light)
Hence the intensity of the ambient fluorescent light (in lux):
IL+Cntńǒ73 @TintǓ(eq. 2)
and the intensity of the ambient incandescent light (in lux):
IL+Cntńǒ106 @TintǓ(eq. 3)
For example let:
Cnt = 7300
Tint = 100 mS
Intensity of ambient fluorescent light, IL(in lux):
IL+7300ńǒ73 @100 mSǓ(eq. 4)
IL = 1000 lux
I2C Interface
The NOA3302 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.
Figure 21 shows an I2C write operation. Write
transactions begin with the master sending an I2C start
sequence followed by the seven bit slave address (NOA3302
= 0x37) and the write(0) command bit. The NOA3302 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 NOA3302 will acknowledge reception
with an ACK. Finally, the master will begin sending 8 bit
data segment(s) to be written to the NOA3302 register bank.
The NOA3302 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).
788
A[6:0] D[7:0] D[7:0]WRITE ACK ACK ACK
Device
Address
Register
Address
Register
Data
Start
Condition
Stop
Condition
011 0111 0 00000 00000000 0110 00
0x6E
Figure 21. I2C Write Command
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Figure 22 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.
788
A[6:0] D[7:0] D[7:0]WRITE ACK ACK ACK
Device
Address
Register
Address
Register
Data
Start
Condition
Stop
Condition
011 0111 0 00000 00000000 0110 00
0x6E
788
A[6:0] D[7:0] D[7:0]READ ACK ACK NACK
Device
Address
Register
Data [A]
Register
Data [A+1]
Start
Condition Stop
Condition
011 0111 1 0 bbbb bbbbbbbb bbbb 01
0x6F
Figure 22. I2C Read Command
After the NOA3302 sends an ACK, the master sends the
register address as if it were going to be written to. The
NOA3302 will acknowledge this as well. Next, instead of
sending data as in a write, the master will re−issue an I2C
START (repeated start) and again send the slave address and
this time the read(1) command bit. The NOA3302 will then
begin shifting out data from the register just addressed. If the
master wishes to receive more data (next register address),
it will ACK the slave at the end of the 8 bit data transmission,
and the slave will respond by sending the next byte, and so
on. To signal the end of the read transaction, the master will
send a NACK bit at the end of a transmission followed by an
I2C STOP.
The NOA3302 also supports I2C high−speed mode. The
transition from standard or fast mode to high−speed mode is
initiated by the I2C master. A special reserve device address
is called for and any device that recognizes this and supports
high speed mode immediately changes the performance
characteristics of its I/O cells in preparation for I2C
transactions at the I2C high speed data protocol rates. From
then on, standard I2C commands may be issued by the
master, including repeated START commands. When the
I2C master terminates any I2C transaction with a STOP
sequence, the master and all slave devices immediately
revert back to standard/fast mode I/O performance.
By using a combination of high−speed mode and a block
write operation, it is possible to quickly initialize the
NOA3302 I2C register bank.
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NOA3302 Data Registers
NOA3302 operation is observed and controlled by internal data registers read from and written to via the external I2C
interface. Registers are listed in Table 6. Default values are set on initial power up or via a software reset command (register
0x01).
The I2C slave address of the NOA3302 is 0x37.
Table 6. NOA3302 DATA REGISTERS
Address Type Name Description
0x00 R PART_ID NOA3302 part number and revision IDs
0x01 RW RESET Software reset control
0x02 RW INT_CONFIG Interrupt pin functional control settings
0x0F RW PS_LED_CURRENT PS LED pulse current (5, 10, …, 160 mA)
0x10 RW PS_TH_UP_MSB PS Interrupt upper threshold, most significant bits
0x11 RW PS_TH_UP_LSB PS Interrupt upper threshold, least significant bits
0x12 RW PS_TH_LO_MSB PS Interrupt lower threshold, most significant bits
0x13 RW PS_TH_LO_LSB PS Interrupt lower threshold, least significant bits
0x14 RW PS_FILTER_CONFIG PS Filter configuration
0x15 RW PS_CONFIG PS Integration time configuration
0x16 RW PS_INTERVAL PS Interval time configuration
0x17 RW PS_CONTROL PS Operation mode control
0x20 RW ALS_TH_UP_MSB ALS Interrupt upper threshold, most significant bits
0x21 RW ALS_TH_UP_LSB ALS Interrupt upper threshold, least significant bits
0x22 RW ALS_TH_LO_MSB ALS Interrupt lower threshold, most significant bits
0x23 RW ALS_TH_LO_LSB ALS Interrupt lower threshold, least significant bits
0x24 RW RESERVED Reserved
0x25 RW ALS_CONFIG ALS Integration time configuration
0x26 RW ALS_INTERVAL ALS Interval time configuration
0x27 RW ALS_CONTROL ALS Operation mode control
0x40 R INTERRUPT Interrupt status
0x41 R PS_DATA_MSB PS measurement data, most significant bits
0x42 R PS_DATA_LSB PS measurement data, least significant bits
0x43 R ALS_DATA_MSB ALS measurement data, most significant bits
0x44 R ALS_DATA_LSB ALS measurement data, least significant bits
PART_ID Register (0x00)
The PART_ID register provides part and revision identification. These values are hard−wired at the factory and can not be
modified.
Table 7. PART_ID REGISTER (0x00)
Bit76543210
Field Part number ID Revision ID
Field Bit Default Description
Part number ID 7:4 1001 Part number identification
Revision ID 3:0 NA Silicon revision number
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RESET Register (0x01)
Software reset is controlled by this register. Setting this
register followed by an I2C_STOP sequence will
immediately reset the NOA3302 to the default startup
standby state. Triggering the software reset has virtually the
same effect as cycling the power supply tripping the internal
Power on Reset (POR) circuitry.
Table 8. RESET REGISTER (0x01)
Bit76543210
Field NA SW_reset
Field Bit Default Description
NA 7:1 XXXXXXX Don’t care
SW_reset 0 0 Software reset to startup state
INT_CONFIG Register (0x02)
INT_CONFIG register controls the external interrupt pin function.
Table 9. INT_CONFIG REGISTER (0x02)
Bit 7 6 5 4 3 2 1 0
Field NA auto_clear polarity
Field Bit Default Description
NA 7:2 XXXXXX Don’t care
auto_clear 1 1 0When an interrupt is triggered, the interrupt pin remains asserted until cleared
by an I2C read of INTERRUPT register
1Interrupt pin state is updated after each measurement
polarity 0 0 0Interrupt pin active low when asserted
1Interrupt pin active high when asserted
PS_LED_CURRENT Register (0x0F)
The LED_CURRENT register controls how much current
the internal LED driver sinks through the IR LED during
modulated illumination. The current sink range is a baseline
5 mA plus a binary weighted value of the LED_Current
register times 5 mA, for an effective range of 5 mA to 160
mA in steps of 5 mA. The default setting is 50 mA.
Table 10. PS_LED_CURRENT REGISTER (0x0F)
Bit76543210
Field NA LED_Current
Field Bit Default Description
NA 7:5 XXX Don’t care
LED_Current 4:0 01001 Defines current sink during LED modulation. Binary weighted value times 5 mA plus 5 mA.
PS_TH Registers (0x10 – 0x13)
With hysteresis not enabled (see PS_CONFIG register),
the PS_TH registers set the upper and lower interrupt
thresholds of the proximity detection window. Interrupt
functions compare these threshold values to data from the
PS_DATA registers. Measured PS_DATA values outside
this window will set an interrupt according to the
INT_CONFIG register settings.
With hysteresis enabled, threshold settings take on a
different meaning. If PS_hyst_trig is set, the PS_TH_UP
register sets the upper threshold at which an interrupt will be
set, while the PS_TH_LO register then sets the lower
threshold hysteresis value where the interrupt would be
cleared. Setting the PS_hyst_trig low reverses the function
such that the PS_TH_LO register sets the lower threshold at
which an interrupt will be set and the PS_TH_UP represents
the hysteresis value at which the interrupt would be
subsequently cleared. Hysteresis functions only apply in
“auto_clear” INT_CONFIG mode.
The controller software must ensure the settings for LED
current, sensitivity range, and integration time (LED pulses)
are appropriate for selected thresholds. Setting thresholds to
extremes (default) effectively disables interrupts.
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Table 11. PS_TH_UP REGISTERS (0x10 – 0x11)
Bit76543210
Field PS_TH_UP_MSB(0x10), PS_TH_UP_LSB(0x11)
Field Bit Default Description
PS_TH_UP_MSB 7:0 0xFF Upper threshold for proximity detection, MSB
PS_TH_UP_LSB 7:0 0xFF Upper threshold for proximity detection, LSB
Table 12. PS_TH_LO REGISTERS (0x12 – 0x13)
Bit76543210
Field PS_TH_LO_MSB(0x12), PS_TH_LO_LSB(0x13)
Field Bit Default Description
PS_TH_LO_MSB 7:0 0x00 Lower threshold for proximity detection, MSB
PS_TH_LO_LSB 7:0 0x00 Lower threshold for proximity detection, LSB
PS_FILTER_CONFIG Register (0x14)
PS_FILTER_CONFIG register provides a hardware
mechanism to filter out single event occurrences or similar
anomalies from causing unwanted interrupts. Two 4 bit
registers (M and N) can be set with values such that M out
of N measurements must exceed threshold settings in order
to set an interrupt. The default setting of 1 out of 1 effectively
turns the filter off and any single measurement exceeding
thresholds can trigger an interrupt. (Note a setting of 0 is
interpreted the same as a 1).
Table 13. PS_FILTER_CONFIG REGISTER (0x14)
Bit76543210
Field filter_N filter_M
Field Bit Default Description
filter_N 7:4 0001Filter N
filter_M 3:0 0001Filter M
PS_CONFIG Register (0x15)
Proximity measurement sensitivity is controlled by
specifying the integration time. The integration time sets the
number of LED pulses during the modulated illumination.
The LED modulation frequency remains constant with a
period of 1.5 ms. Changing the integration time affects the
sensitivity of the detector and directly affects the power
consumed by the LED. The default is 300 ms integration
period.
Hyst_enable and hyst_trigger work with the PS_TH
(threshold) settings to provide jitter control of the INT
function.
Table 14. PS_CONFIG REGISTER (0x15)
Bit 7 6 5 4 3 2 1 0
Field NA hyst_enable hyst_trigger NA NA integration_time
Field Bit Default Description
NA 7:6 XX Don’t Care
hyst_enable 5 0 0Disables hysteresis
1Enables hysteresis
hyst_trigger 4 0 0Lower threshold with hysteresis
1Upper threshold with hysteresis
NA 3:2 X Don’t Care
integration_time 1:0 01 00 150 ms integration time
01 300 ms integration time
10 600 ms integration time
11 1200 ms integration time
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PS_INTERVAL Register (0x16)
The PS_INTERVAL register sets the wait time between
consecutive proximity measurements in PS_Repeat mode.
The register is binary weighted times 5 in milliseconds with
the special case that the register value 0x00 specifies 5 ms.
The range is therefore 5 ms to 1.28 s. The default startup
value is 0x0A (50 ms).
Table 15. PS_INTERVAL REGISTER (0x16)
Bit76543210
Field interval
Field Bit Default Description
Interval 7:0 0x0A 0x01 to 0xFF Interval time between measurement cycles. Binary weighted value
times 5 ms plus a 5 ms offset.
PS_CONTROL Register (0x17)
The PS_CONTROL register is used to control the
functional mode and commencement of proximity sensor
measurements. The proximity sensor can be operated in
either a single shot mode or consecutive measurements
taken at programmable intervals.
Both single shot and repeat modes consume a minimum
of power by immediately turning off LED driver and sensor
circuitry after each measurement. In both cases the quiescent
current is less than the IDDSTBY parameter. These automatic
power management features eliminate the need for power
down pins or special power down instructions.
Table 16. PS_CONTROL REGISTER (0x17)
Bit 7 6 5 4 3 2 1 0
Field NA PS_Repeat PS_OneShot
Field Bit Default Description
NA 7:2 XXXXXX Don’t care
PS_Repeat 1 0 Initiates new measurements at PS_Interval rates
PS_OneShot 0 0 Triggers proximity sensing measurement. In single shot mode this bit clears
itself after cycle completion.
ALS_TH Registers (0x20 – 0x23)
With hysteresis not enabled (see ALS_CONFIG register),
the ALS_TH registers set the upper and lower interrupt
thresholds of the ambient light detection window. Interrupt
functions compare these threshold values to data from the
ALS_DATA registers. Measured ALS_DATA values
outside this window will set an interrupt according to the
INT_CONFIG register settings.
With hysteresis enabled, threshold settings take on a
different meaning. If the ALS_hyst_trig is set, the
ALS_TH_UP register sets the upper threshold at which an
interrupt will be set, while the ALS_TH_LO register then
sets the lower threshold hysteresis value where the interrupt
would be cleared. Setting the ALS_hyst_trig low reverses
the function such that the ALS_TH_LO register sets the
lower threshold at which an interrupt will be set and the
ALS_TH_UP represents the hysteresis value at which the
interrupt would be subsequently cleared. Hysteresis
functions only apply in “auto_clear” INT_CONFIG mode.
Table 17. ALS_TH_UP REGISTERS (0x20 – 0x21)
Bit76543210
Field ALS_TH_UP_MSB(0x20), ALS_TH_UP_LSB(0x21)
Field Bit Default Description
ALS_TH_UP_MSB 7:0 0xFF Upper threshold for ALS detection, MSB
ALS_TH_UP_LSB 7:0 0xFF Upper threshold for ALS detection, LSB
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Table 18. ALS_TH_LO REGISTERS (0x22 – 0x23)
Bit76543210
Field ALS_TH_LO_MSB(0x22), ALS_TH_LO_LSB(0x23)
Field Bit Default Description
ALS_TH_LO_MSB 7:0 0x00 Lower threshold for ALS detection, MSB
ALS_TH_LO_LSB 7:0 0x00 Lower threshold for ALS detection, LSB
ALS_CONFIG Register (0x25)
The ALS_CONFIG register controls the ambient light
measurement sensitivity by specifying the integration time.
Hyst_enable and hyst_trigger work with the ALS_TH
(threshold) settings to provide jitter control of the INT
function.
Integration times below 50 ms are not recommended for
normal operation as 50/60 Hz rejection will be impacted.
They may be used in testing or if 50/60 Hz rejection is not
a concern.
Table 19. ALS_CONFIG REGISTER (0x25)
Bit 7 6 5 4 3 2 1 0
Field NA hyst_enable hyst_trigger reserved integration_time
Field Bit Default Description
NA 7:6 XX Don’t Care
hyst_enable 5 0 0Disables hysteresis
1Enables hysteresis
hyst_trigger 4 0 0Lower threshold with hysteresis
1Upper threshold with hysteresis
reserved 3 0 Must be set to 0
integration_time 2:0 100 000 6.25 ms integration time
001 12.5 ms integration time
010 25 ms integration time
011 50 ms integration time
100 100 ms integration time
101 200 ms integration time
110 400 ms integration time
111 800 ms integration time
ALS_INTERVAL Register (0x26)
The ALS_INTERVAL register sets the interval between
consecutive ALS measurements in ALS_Repeat mode. The
register is binary weighted times 50 in milliseconds. The
range is 0 ms to 3.15 s. The register value 0x00 and 0 ms
translates into a continuous loop measurement mode at any
integration time. The default startup value is 0x0A (500 ms).
Table 20. ALS_INTERVAL REGISTER (0x26)
Bit 7 6 5 4 3 2 1 0
Field NA interval
Field Bit Default Description
interval 5:0 0x0A Interval time between ALS measurement cycles
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ALS_CONTROL Register (0x27)
The ALS_CONTROL register is used to control the
functional mode and commencement of ambient light
sensor measurements. The ambient light sensor can be
operated in either a single shot mode or consecutive
measurements taken at programmable intervals.
Both single shot and repeat modes consume a minimum
of power by immediately turning off sensor circuitry after
each measurement. In both cases the quiescent current is less
than the IDDSTBY parameter. These automatic power
management features eliminate the need for power down
pins or special power down instructions.
For accurate measurements at low light levels (below
approximately 3 lux) ALS readings must be taken at least
once per second and the first measurement after a reset
(software reset or power cycling) should be ignored.
Table 21. ALS_CONTROL REGISTER (0x27)
Bit 7 6 5 4 3 2 1 0
Field NA ALS_Repeat ALS_OneShot
Field Bit Default Description
NA 7:2 XXXXXX Don’t care
ALS_Repeat 1 0 Initiates new measurements at ALS_Interval rates
ALS_OneShot 0 0 Triggers ALS sensing measurement. In single shot mode this bit clears itself after cycle
completion.
INTERRUPT Register (0x40)
The INTERRUPT register displays the status of the interrupt pin and if an interrupt was caused by the proximity or ambient
light sensor. If “auto_clear” is disabled (see INT_CONFIG register), reading this register also will clear the interrupt.
Table 22. INTERRUPT REGISTER (0x40)
Bit 7 6 5 4 3 2 1 0
Field NA INT ALS_intH ALS_intL PS_intH PS_intL
Field Bit Default Description
NA 7:5 XXX Don’t care
INT 4 0 Status of external interrupt pin (1 is asserted)
ALS_intH 3 0 Interrupt caused by ALS exceeding maximum
ALS_intL 2 0 Interrupt caused by ALS falling below the minimum
PS_intH 1 0 Interrupt caused by PS exceeding maximum
PS_intL 0 0 Interrupt caused by PS falling below the minimum
PS_DATA Registers (0x41 – 0x42)
The PS_DATA registers store results from completed
proximity measurements. When an I2C read operation
begins, the current PS_DATA registers are locked until the
operation is complete (I2C_STOP received) to prevent
possible data corruption from a concurrent measurement
cycle.
Table 23. PS_DATA REGISTERS (0x41 – 0x42)
Bit76543210
Field PS_DATA_MSB(0x41), PS_DATA_LSB(0x42)
Field Bit Default Description
PS_DATA_MSB 7:0 0x00 Proximity measurement data, MSB
PS_DATA_LSB 7:0 0x00 Proximity measurement data, LSB
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ALS_DATA Registers (0x43 – 0x44)
The ALS_DATA registers store results from completed
ALS measurements. When an I2C read operation begins, the
current ALS_DATA registers are locked until the operation
is complete (I2C_STOP received) to prevent possible data
corruption from a concurrent measurement cycle.
Table 24. ALS_DATA REGISTERS (0x43 – 0x44)
Bit76543210
Field ALS_DATA_MSB(0x43), ALS_DATA_LSB(0x44)
Field Bit Default Description
ALS_DATA_MSB 7:0 0x00 ALS measurement data, MSB
ALS_DATA_LSB 7:0 0x00 ALS measurement data, LSB
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Proximity Sensor Operation
NOA3302 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 NOA3302 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. Figures 23 and 24 illustrate the
activity of key signals during a proximity sensor
measurement cycle. The cycle begins by starting the
precision oscillator and powering up and calibrating 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 (unless there is an active ALS
measurement). 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 = 300 ms), the total measurement cycle will
be less than 2 ms.
Figure 23. Proximity Sensor One−Shot Timing
9ms
I2C Stop
PS Power
4MHz Osc On
LED Burst
Integration
Data Available
50−200 ms
~600 ms
8 clks 12 ms
Integration Time
0−100 ms
100−150 ms
Figure 24. Proximity Sensor Repeat Timing
Interval (Repeat)
9ms
I2C Stop
PS Power
4MHz Osc On
LED Burst
Integration
Data Available
50−200 ms
~600 ms
8 clks 12 ms
Integration Time
0−100 ms
100−150 ms
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Ambient Light Sensor Operation
The ALS configuration is accomplished by writing the
desired configuration values to registers 0x02 and 0x20
through 0x27. 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 NOA3302 automatically
increments the register address as it acknowledges each byte
transfer.
ALS measurement is initiated by writing appropriate
values to the CONTROL register (0x27). 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. Figures 25 and 26 illustrate the activity
of key signals during an ambient light sensor measurement
cycle. The cycle begins by starting the precision oscillator
and powering up the ambient light sensor. Next, the ambient
light measurement is made for the specified integration time
and the result is stored in the 16 bit ALS Data register. If in
One−shot mode, the ALS is powered down and awaits the
next command. If in Repeat mode the ALS is powered down,
the interval is timed out and the operation repeated. There
are some special cases if the interval timer is set to less than
the integration time. For continuous mode, the interval is set
to 0 and the ALS makes continuous measurements with only
a 5 ms delay between integration times and the ALS remains
powered up. If the interval is set equal to or less than the
integration time (but not to 0), there is a 10 ms time between
integrations and the ALS remains powered up.
I2C Stop
ALS Power
4MHz Osc On
Integration
Data Available
10ms Integration Time
5ms
Figure 25. ALS One−Shot Timing
50−100ms
100−150ms
150−200ms
Interval (Repeat)
I2C Stop
ALS Power
4MHz Osc On
Integration
Data Available
0−25ms
10ms Integration Time
5ms
Figure 26. ALS Repeat Timing
50−100ms
100−150ms
NOTE: If Interval is set to 0 (continuous) the time between integrations is 5 ms and power stays on.
If Interval is set to ≤ to the integration time (but not 0) the time between integrations is 10 ms and power stays on.
If Interval is set to > integration time the time between integrations is the interval and the ALS powers down.
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Example Programming Sequence
The following pseudo code configures the NOA3302 proximity sensor in repeat mode with 50 ms wait time between each
measurement and then runs it in an interrupt driven mode. When the controller receives an interrupt, the interrupt determines
if the interrupts was caused by the proximity sensor and if so, reads the PS_Data from the device, sets a flag and then waits
for the main polling loop to respond to the proximity change.
external subroutine I2C_Read_Byte (I2C_Address, Data_Address);
external subroutine I2C_Read_Block (I2C_Address, Data_Start_Address, Count, Memory_Map);
external subroutine I2C_Write_Byte (I2C_Address, Data_Address, Data);
external subroutine I2C_Write_Block (I2C_Address, Data_Start_Address, Count, Memory_Map);
subroutine Initialize_PS () {
MemBuf[0x02] = 0x02; // INT_CONFIG assert interrupt until cleared
MemBuf[0x0F] = 0x09; // PS_LED_CURRENT 50mA
MemBuf[0x10] = 0x8F; // PS_TH_UP_MSB
MemBuf[0x11] = 0xFF; // PS_TH_UP_LSB
MemBuf[0x12] = 0x70; // PS_TH_LO_MSB
MemBuf[0x13] = 0x00; // PS_TH_LO_LSB
MemBuf[0x14] = 0x11; // PS_FILTER_CONFIG turn off filtering
MemBuf[0x15] = 0x01; // PS_CONFIG 300us integration time
MemBuf[0x16] = 0x0A; // PS_INTERVAL 50ms wait
MemBuf[0x17] = 0x02; // PS_CONTROL enable continuous PS measurements
MemBuf[0x20] = 0xFF; // ALS_TH_UP_MSB
MemBuf[0x21] = 0xFF; // ALS_TH_UP_LSB
MemBuf[0x22] = 0x00; // ALS_TH_LO_MSB
MemBuf[0x23] = 0x00; // ALS_TH_LO_LSB
MemBuf[0x25] = 0x04; // ALS_CONFIG 100ms integration time
MemBuf[0x26] = 0x00; // ALS_INTERVAL continuous measurement mode
MemBuf[0x27] = 0x02; // ALS_CONTROL enable continuous ALS measurements
I2C_Write_Block (I2CAddr, 0x02, 37, MemBuf);
}
subroutine I2C_Interupt_Handler () {
// Verify this is a PS interrupt
INT = I2C_Read_Byte (I2CAddr, 0x40);
if (INT == 0x11 || INT == 0x12) {
// Retrieve and store the PS data
PS_Data_MSB = I2C_Read_Byte (I2CAddr, 0x41);
PS_Data_LSB = I2C_Read_Byte (I2CAddr, 0x42);
NewPS = 0x01;
}
}
subroutine main_loop () {
I2CAddr = 0x37;
NewPS = 0x00;
Initialize_PS ();
loop {
// Do some other polling operations
if (NewPS == 0x01) {
NewPS = 0x00;
// Do some operations with PS_Data
}
}
}
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PACKAGE DIMENSIONS
CWDFN8, 2x2, 0.5P
CASE 505AJ
ISSUE O
MOUNTING FOOTPRINT*
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
8X
0.52
0.50
PITCH
1.70
2.30
8X
0.27
1.00
1
RECOMMENDED
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.10 AND 0.20 MM FROM THE TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
A
D
E
B
C0.10
PIN ONE
REFERENCE
2X
TOP VIEW
SIDE VIEW
BOTTOM VIEW
L
D2
E2
C
C0.05
C0.08
A1 SEATING
PLANE
8X
NOTE 3
b
8X
0.10 C
0.05 C
A BB
DIM MIN MAX
MILLIMETERS
A0.60 0.70
A1 0.00 0.05
b0.15 0.25
D2.00 BSC
D2 1.45 1.70
E2.00 BSC
E2 0.75 1.00
e0.50 BSC
L0.20 0.40
14
8
NOTE 4
A3 0.20 REF
A3
A
K0.15 −−−
e
5
K
e/2
C0.10
2X
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