DATASHEET

DATASHEET
Ultra-Low Lux, Low Power, Integrated Digital Ambient
Light Sensor with Interrupt Function
ISL29033
Features
The ISL29033 is an integrated ambient and infrared
light-to-digital converter with I2C (SMBus Compatible)
interface. Its advanced, self-calibrated photodiode array
emulates human eye response with excellent IR rejection. The
on-chip 16-bit ADC is capable of rejecting 50Hz and 60Hz
flicker caused by artificial light sources. The lux range select
feature allows users to program the lux range for optimized
counts/lux. Power consumption can be reduced to less than
0.3µA when powered down.
• Ambient light sensing
The ISL29033 supports a software and hardware interrupt that
remains asserted until the host clears it through the I2C
interface. The function of ADC conversion continues without
stopping after interrupt is asserted.
• Light sensor close to human eye response
• Simple output code directly proportional to lux
• Variable conversion resolution up to 16 bits
• Adjustable sensitivity up to 520 counts per lux
• Measurement range: 0.0019 to 8,000lux with four
selectable ranges
• Program interrupt feature
- Excellent light sensor IR and UV rejection
• 75μA maximum operating current
- 0.3μA maximum shutdown current
Designed to operate on supplies from 2.25V to 3.63V with an
I2C supply from 1.7V to 3.63V, the ISL29033 is specified for
operation over the -40°C to +85°C ambient temperature
range.
• 6 Ld 2.0mmx2.1mmx0.7mm ODFN package
Applications
• Display and keypad dimming adjustment for:
- Mobile devices: smart phone, PDA, GPS
- Computing devices: notebook PC, webpad
- Consumer devices: LCD-TV, digital picture frame, digital
camera
• Industrial and medical light sensing
Related Literature
• AN1591 “Evaluation Hardware/Software Manual for ALS
and Proximity Sensors”
VDD
1
COMMAND
REGISTER
PHOTODIODE
ARRAY
INTEGRATION
ADC
LIGHT
DATA
DATA
REGISTER
PROCESS
I2C/SMBus
5
SCL
6
SDA
IREF
INTERRUPT
REGISTER
fOSC
3
2
4
REXT
GND
INT
FIGURE 1. BLOCK DIAGRAM
April 21, 2016
FN7656.4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL29033
Pin Configuration
ISL29033
(6 LD ODFN)
BOTTOM VIEW
VDD
1
GND
2
REXT
PD*
3
Pin Descriptions
PIN
NUMBER PIN NAME
6
SDA
5
SCL
4
INT
*EXPOSED PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
DESCRIPTION
PD
PD
Thermal Pad (connect to GND, or float)
1
VDD
Positive supply: 2.25V to 3.63V
2
GND
Ground
3
REXT
External resistor pin for ADC reference; connect
this pin to ground through a (nominal) 499kΩ
resistor.
4
INT
Interrupt pin: low for interrupt alarming. INT pin
is open-drain. INT remains asserted until the
interrupt flag status bit is reset.
5
SCL
I2C serial clock
6
SDA
I2C serial data
Ordering Information
PART NUMBER
(Notes 1, 2, 3, 4)
TEMP. RANGE
(°C)
ISL29033IROZ-T7
-40 to +85
ISL29033IROZ-EVALZ
PACKAGE
(RoHS Compliant)
6 Ld ODFN
PKG.
DWG. #
L6.2x2.1
Evaluation Board
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu
plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL29033. For more information on MSL please see Tech Brief TB477.
4. The part marking is located on the bottom of the part.
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ISL29033
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
VDD Supply Voltage between VDD and GND . . . . . . . . . . . . . . . . . . . . . .4.0V
Thermal Resistance (Typical)
I2C Bus Pin Voltage (SCL, SDA). . . . . . . . . . . . . . . . . . . . . . . . . -0.2V to 4.0V
I2C Bus Pin Current (SCL, SDA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
REXT Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.2V to VDD + 0.5V
INT Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VDD + 0.5V
INT Pin Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
JA (°C/W)
88
6 Ld ODFN (Note 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +90°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +100°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.25V to 3.63V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTE:
5. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB477.
Electrical Specifications
PARAMETER
VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance, 16-bit ADC operation, unless otherwise specified.
DESCRIPTION
TEST CONDITIONS
MIN
(Note 6)
VDD
Power Supply Range
IDD
Supply Current
IDD1
Supply Current when Powered Down
VI2C
Supply Voltage Range for I2C Interface
1.70
fOSC
Internal Oscillator Frequency
600
tINT
ADC Integration/Conversion Time
FI2C
I2C Clock Rate Range
TYP
2.25
65
Software disabled or auto power-down
0.01
16-bit ADC data
DATA_0
Count Output when Dark
E = 0 lux, Range 1 (125 lux)
DATA_F
Full Scale ADC Code
ΔDATA
DATA
Count Output Variation Over Three Light
Sources: Fluorescent, Incandescent and
Sunlight
Ambient light sensing
DATA_1
Light Count Output with LSB of
0.0019 Lux/Count
E = 37.5 lux, fluorescent light (Note 7),
ambient light sensing, Range 1 (125 lux)
DATA_2
Light Count Output with LSB of
0.0075 Lux/Count
E = 37.5 lux, fluorescent light (Note 7),
ambient light sensing, Range 2 (500 lux)
DATA_3
DATA_4
670
MAX
(Note 6)
UNIT
3.63
V
75
µA
0.3
µA
3.63
V
740
kHz
100
ms
1 to
400
kHz
1
5
Counts
65535
Counts
±10
16000
20000
%
24000
Counts
5000
Counts
Light Count Output with LSB of 0.03 Lux/Count E = 37.5 lux, fluorescent light (Note 7),
ambient light sensing, Range 3 (2k lux)
1250
Counts
Light Count Output with LSB of 0.12 Lux/Count E = 37.5 lux, fluorescent light (Note 7),
ambient light sensing, Range 4 (8k lux)
312
Counts
DATA_IR1
Infrared Count Output
E = 20 lux solar light (Note 8),
ambient light sensing, Range 1 (125 lux)
DATA_IR2
Infrared Count Output
E = 20 lux solar light (Note 8),
ambient light sensing, Range 2 (500 lux)
5000
Counts
DATA_IR3
Infrared Count Output
E = 20 lux solar light (Note 8),
ambient light sensing, Range 3 (2000 lux)
1250
Counts
DATA_IR4
Infrared Count Output
E = 20 lux solar light (Note 8),
ambient light sensing, Range 4 (8000 lux)
312
Counts
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3
16000
20000
24000
Counts
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April 21, 2016
ISL29033
Electrical Specifications
(Continued)
PARAMETER
VREF
VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance, 16-bit ADC operation, unless otherwise specified.
DESCRIPTION
TEST CONDITIONS
MIN
(Note 6)
Voltage of REXT Pin
TYP
MAX
(Note 6)
UNIT
0.55
V
0.52
V
VIL
SCL and SDA Input Low Voltage
VIH
SCL and SDA Input High Voltage
ISDA
SDA Current Sinking Capability
VOL = 0.4V
4
5
mA
IINT
INT Current Sinking Capability
VOL = 0.4V
4
5
mA
Electrical Specifications
PARAMETER
1.25
V
VDD = 3.0V, TA = +25°C, REXT = 1MΩ1% tolerance, 16-bit ADC operation, unless otherwise specified.
DESCRIPTION
TEST CONDITIONS
MIN
(Note 6)
VDD
Power Supply Range
IDD
Supply Current
IDD1
Supply Current when Powered Down
VI2C
Supply Voltage Range for I2C Interface
1.70
fOSC
Internal Oscillator Frequency
305
tINT
ADC Integration/Conversion Time
FI2C
I2C Clock Rate Range
TYP
2.25
42
Software disabled or auto power-down
0.01
16-bit ADC data
UNIT
3.63
V
50
µA
0.3
µA
3.63
V
385
kHz
200
ms
1 to
400
kHz
DATA_0
Count Output when Dark
DATA_F
Full Scale ADC Code
ΔDATA
DATA
Count Output Variation Over Three Light
Sources: Fluorescent, Incandescent and
Sunlight
Ambient Light Sensing
DATA_1
Light Count Output with LSB
of 0.00095 Lux/Count
E = 18.75 lux, fluorescent light (Note 7),
ambient light sensing, Range 1 (62.5 lux)
DATA_2
Light Count Output with LSB
of 0.000375 Lux/Count
E = 18.75 lux, fluorescent light (Note 7),
ambient light sensing, Range 2 (250 lux)
5000
Counts
DATA_3
Light Count Output with LSB
of 0.015 Lux/Count
E = 18.75 lux, fluorescent light (Note 7),
ambient light sensing, Range 3 (1k lux)
1250
Counts
DATA_4
Light Count Output with LSB
of 0.6 Lux/Count
E = 18.75 lux, fluorescent light (Note 7),
ambient light sensing, Range 4 (4k lux)
312
Counts
DATA_IR1
Infrared Count Output
E = 10 lux solar light (Note 8),
ambient light sensing, Range 1 (62.5 lux)
DATA_IR2
Infrared Count Output
E = 10 lux solar light (Note 8),
ambient light sensing, Range 2 (250 lux)
5000
Counts
DATA_IR3
Infrared Count Output
E = 10 lux solar light (Note 8),
ambient light sensing, Range 3 (1000 lux)
1250
Counts
DATA_IR4
Infrared Count Output
E = 10 lux solar light (Note 8),
ambient light sensing, Range 4 (4000 lux)
312
Counts
0.52
V
VREF
E = 0 lux, Range 1 (125 lux)
340
MAX
(Note 6)
1
10
Counts
65535
Counts
±10
15000
15000
Voltage of REXT Pin
20000
20000
%
25000
25000
Counts
VIL
SCL and SDA Input Low Voltage
VIH
SCL and SDA Input High Voltage
ISDA
SDA Current Sinking Capability
VOL = 0.4V
4
5
mA
IINT
INT Current Sinking Capability
VOL = 0.4V
4
5
mA
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4
0.55
Counts
1.25
V
V
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April 21, 2016
ISL29033
I2C Electrical Specifications
1% tolerance.
PARAMETER
For SCL and SDA (Figure 2), unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% and 1MΩ
DESCRIPTION
TEST CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
3.63
V
VI2C
Supply Voltage Range for I2C Interface
fSCL
SCL Clock Frequency
400
kHz
VIL
SCL and SDA Input Low Voltage
0.55
V
VIH
SCL and SDA Input High Voltage
Vhys
Hysteresis of Schmitt Trigger Input
VOL
Low-Level Output Voltage (Open-Drain) at 4mA
Sink Current
Ii
1.7
Input Leakage for each SDA, SCL Pin
1.25
V
0.05VDD
V
-10
0.4
V
10
µA
tSP
Pulse Width of Spikes that must be Suppressed by
the Input Filter
50
ns
tAA
SCL Falling Edge to SDA Output Data Valid
900
ns
Ci
Capacitance for each SDA and SCL Pin
10
pF
tHD:STA
Hold Time (Repeated) START Condition
After this period, the first clock pulse
is generated.
600
tLOW
LOW Period of the SCL Clock
Measured at the 30% of VDD crossing
1300
ns
tHIGH
HIGH Period of the SCL Clock
600
ns
tSU:STA
Set-up Time for a Repeated START Condition
600
ns
tHD:DAT
Data Hold Time
30
ns
tSU:DAT
Data Set-Up Time
100
ns
ns
tR
Rise Time of both SDA and SCL Signals
(Note 9)
20 + 0.1xCb
tF
Fall Time of both SDA and SCL Signals
(Note 9)
tSU:STO
tBUF
Cb
ns
20 + 0.1xCb
ns
Set-Up Time for STOP Condition
600
ns
Bus Free Time Between a STOP and START
Condition
1300
ns
Capacitive Load for Each Bus Line
400
pF
Rpull-up
SDA and SCL System Bus Pull-Up Resistor
tVD;DAT
Data Valid Time
0.9
µs
tVD:ACK
Data Valid Acknowledge Time
0.9
µs
VnL
Noise Margin at the LOW Level
0.1VDD
V
VnH
Noise Margin at the HIGH Level
0.2VDD
V
Maximum is determined by tR and tF
1
kΩ
NOTE:
6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
7. A 550nm green LED is used in production test. The 550nm LED irradiance is calibrated to produce the same DATA count as a fluorescent light with
illuminance at the stated lux.
8. An 850nm IR LED is used in production test. The 850nm LED irradiance is calibrated to produce the same DATA_IR count as solar light with
illuminance at the stated lux.
9. Cb is the capacitance of the bus in pF.
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FN7656.4
April 21, 2016
ISL29033
Principles of Operation
Photodiodes and ADC
The ISL29033 contains two photodiode arrays that convert light
into current. The spectral response for ambient light sensing and
infrared (IR) sensing is shown in Figure 8 on page 12. After light
is converted to current during the light signal process, the current
output is converted to digital by a built-in 16-bit Analog-to-Digital
Converter (ADC). An I2C command reads the ambient light or IR
intensity in counts.
The converter is a charge-balancing integrating type 16-bit ADC. The
chosen method for conversion is best for converting small current
signals in the presence of an AC periodic noise. A 100ms integration
time, for instance, highly rejects a 50Hz and 60Hz power line noise
simultaneously. See “Integration and Conversion Time” on page 9.
The built-in ADC offers user flexibility in integration time or
conversion time. There are two timing modes: Internal timing
mode and external timing mode. In internal timing mode,
integration time is determined by an internal oscillator (fOSC) and
the n-bit (n = 4, 8, 12, 16) counter inside the ADC. In external
timing mode, integration time is determined by the time between
two consecutive I2C External Timing Mode commands. A good
balance of integration time and resolution (depending on
application) is required for optimal results.
The ADC has I2C programmable range select to dynamically
accommodate various lighting conditions. For very dim conditions,
the ADC can be configured at its lowest range (Range 1) in the
ambient light sensing.
Low-Power Operation
The ISL29033 initial operation is at the power-down mode after a
supply voltage is provided. The data registers contain the default
value of 0. When the ISL29033 receives an I2C command to do a
one-time measurement from an I2C master, it starts ADC
conversion with light sensing. It goes to power-down mode
automatically after one conversion is finished and keeps the
conversion data available for the master to fetch anytime
afterwards. The ISL29033 continuously does ADC conversion
with light sensing if it receives an I2C command of continuous
measurement. It continuously updates the data registers with
the latest conversion data. It goes to power-down mode after it
receives the I2C command of power-down.
Interrupt Function
The active low interrupt pin is an open-drain pull-down
configuration. The interrupt pin serves as an alarm or monitoring
function to determine whether the ambient light level exceeds
the upper threshold or goes below the lower threshold. Note that
the function of ADC conversion continues without stopping after
interrupt is asserted. If the user needs to read the ADC count that
triggers the interrupt, reading should be done before the data
registers are refreshed by subsequent conversions. The user can
also configure the persistency of the interrupt pin. This reduces
the possibility of false triggers, such as noise or sudden spikes in
ambient light conditions. An unexpected camera flash, for
example, can be ignored by setting the persistency to eight
integration cycles.
ALS Ranges Considerations
When measuring ALS counts higher than 30000 counts on
Range 1 of the 16-bit ADC, switch to Range 2 (change [1 to 0]
bits of Register 1 from 00 to 01) and remeasure the ALS counts
and other data to change to Range 3 and Range 4. This
recommendation pertains only to applications in which light
incident on the sensor is IR-heavy and is distorted by tinted glass
that increases the ratio of infrared to visible light.
VDD Power-Up and Power Supply
Considerations
Upon power-up, ensure a VDD slew rate of 0.5V/ms or greater.
After power-up, or if the power supply temporarily deviates from
specification (2.25V to 3.63V), the following step is
recommended: write 0x00 to register 0x00. Wait a few seconds
and then rewrite all registers to the desired values. A hardware
reset method can be used, if preferred, instead of writing to the
test registers. For this method, set VDD = 0V for 1 second or more,
power backup at the required slew rate and write the registers to the
desired values.
Power-Down
To put the ISL29033 into a power-down state, the user can set
[7 to 5] bits to 0 in Register 0. Or more simply, set all of
Register 0 to 0x00.
I2C Interface
Ambient Light
There are two operational modes in ISL29033: Programmable
continuous ALS sensing and programmable continuous IR sensing.
These two modes can be programmed in series to fulfill the
application needs. The detailed program configuration is shown in
the “BLOCK DIAGRAM” on page 1.
When the part is programmed for ambient light sensing, the
ambient light with wavelength within the “Ambient Light
Sensing” spectral response curve in Figure 8 is converted into
current. With ADC, the current is converted to an unsigned n-bit
(up to 16 bits) digital output.
When the part is programmed for infrared (IR) sensing, the IR
light with wavelength within the “IR Sensing” spectral response
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curve in Figure 8 is converted into current. With ADC, the current
is converted to an unsigned n-bit (up to 16 bits) digital output.
6
There are eight 8-bit registers available inside the ISL29033. The
two command registers define the operation of the device. The
command registers do not change until the registers are
overwritten. The two 8-bit data read-only registers are for the ADC
output. The data registers contain the ADC's latest digital output,
or the number of clock cycles in the previous integration period
(Figure 2).
The ISL29033 I2C interface slave address is internally hard-wired as
1000100. When 1000100x, with x as R or W, is sent after the start
condition, the device compares the first 7 bits of this byte to its
address and matches. Figure 3 shows a sample one-byte read and
Figure 4 shows a sample one-byte write. The I2C bus master
always drives the SCL (clock) line, while either the master or the
slave can drive the SDA (data) line. Every I2C transaction begins
FN7656.4
April 21, 2016
ISL29033
master asserting a stop condition (SDA rising while SCL remains
high).
with the master asserting a start condition (SDA falling while SCL
remains high). The following byte is driven by the master and
includes the slave address and the read/write bit. The receiving
device is responsible for pulling SDA low during the
acknowledgment period. Every I2C transaction ends with the
For more information about the I2C standard, please consult the
Philips™ I2C specification documents.
FIGURE 2. I2C TIMING DIAGRAM
I2C DATA
DEVICE ADDRESS
START
I2C SDA
IN
I2C SDA
OUT
REGISTER ADDRESS
W A
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
A
SDA DRIVEN BY MASTER
DEVICE ADDRESS
STOP START
A6 A5 A4 A3 A2 A1 A0 W
A
SDA DRIVEN BY MASTER
DATA BYTE0
A
SDA DRIVEN BY ISL29033
A
SDA DRIVEN BY MASTER
A D7 D6 D5 D4 D3 D2 D1 D0
I2C CLK
1
2
3
4
5
6
7
9
8
1
2
3
5
4
6
7
8
1
9
2
3
4
5
6
7
9
8
1
2
3
4
6
5
7
8
9
FIGURE 3. I2C READ TIMING DIAGRAM SAMPLE
I2C DATA
START
DEVICE ADDRESS
W
A
W
A
R7 R6 R5 R4 R3 R2 R1 R0
A
B7 B6 B5 B4 B3 B2 B1 B0
A
SDA DRIVEN BY MASTER
A
SDA DRIVEN BY MASTER
A
REGISTER ADDRESS
A
FUNCTIONS
STOP
I2C SDA IN
A6 A5 A4 A3 A2 A1 A0
A
I2C SDA OUT
SDA DRIVEN BY MASTER
A
I2C CLK IN
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
FIGURE 4. I2C WRITE TIMING DIAGRAM SAMPLE
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April 21, 2016
ISL29033
TABLE 1. REGISTER SET
BIT
ADDR
REG NAME
7
6
5
4
3
2
1
0
DEFAULT
00h
COMMANDI
OP2
OP1
OP0
0
0
FLAG
PRST1
PRST0
00h
01h
COMMANDII
0
0
0
0
RES1
RES0
RANGE 1
RANGE 0
00h
02h
DATALSB
D7
D6
D5
D4
D3
D2
D1
D0
00h
03h
DATAMSB
D15
D14
D13
D12
D11
D10
D9
D8
00h
04h
INT_LT_LSB
TL7
TL6
TL5
TL4
TL3
TL2
TL1
TL0
00h
05h
INT_LT_MSB
TL15
TL14
TL13
TL12
TL11
TL10
TL9
TL8
00h
06h
INT_HT_LSB
TH7
TH6
TH5
TH4
TH3
TH2
TH1
TH0
FFh
07h
INT_HT_MSB
TH15
TH14
TH13
TH12
TH11
TH10
TH9
TH8
FFh
Register Set
TABLE 4. INTERRUPT PERSIST
There are eight registers available in the ISL29033. Table 1
summarizes their functions.
BIT 1:0
NUMBER OF INTEGRATION CYCLES
00
1
Command Register I 00 (Hex)
01
4
The first command register has the following functions:
10
8
11
16
1. Operation Mode: Bits 7, 6 and 5. These three bits determine
the operation mode of the device (Table 2).
2. Interrupt flag: Bit 2. This is the status bit of the interrupt
(Table 3). The bit is set to logic high when the interrupt
thresholds have been triggered (out of threshold window) and
to logic low when not yet triggered. When activated and the
interrupt is triggered, the INT pin goes low and the interrupt
status bit goes high until the status bit is polled through the
I2C read command. Both the INT output and the interrupt
status bit are automatically cleared at the end of the 8-bit
(00h) command register transfer.
3. Interrupt Persist: Bits 1 and 0. The interrupt pin and the
interrupt flag are triggered or set when the data sensor
reading is out of the interrupt threshold window after m
consecutive number of integration cycles (Table 4). The
interrupt persist bits determine m.
TABLE 2. OPERATION MODE
Command Register II 01 (Hex)
The second command register has the following functions:
1. Resolution: Bits 3 and 2. Bits 3 and 2 determine the ADC
resolution and the number of clock cycles per conversion
(Table 5). Changing the number of clock cycles does more than
just change the resolution of the device; it also changes the
integration time, which is the period during which the
Analog-to-Digital (A/D) converter samples the photodiode
current signal for a measurement.
2. Range: Bits 1 and 0. The Full Scale Range (FSR) can be
adjusted through the I2C by using Bits 1 and 0. Table 6 lists
the possible values of FSR for the 499kΩ REXT resistor.
TABLE 5. ADC RESOLUTION DATA WIDTH
BITS 3:2
NUMBER OF CLOCK CYCLES
n-BIT ADC
00
216 = 65,536
000
Power-down the device
01
212 = 4,096
12
001
Reserved (Do not use)
10
28 = 256
8
010
Reserved (Do not use)
11
24 = 16
4
100
Reserved (Do not use)
101
ALS continuous
BITS 1:0
k
RANGE(k)
FSR (LUX) AT ALS SENSING
110
IR continuous
00
1
Range1
125
111
Reserved (Do not use)
01
2
Range2
500
10
3
Range3
2,000
11
4
Range4
8,000
BITS 7 TO 5
OPERATION
TABLE 3. INTERRUPT FLAG
BIT 2
OPERATION
0
Interrupt is cleared or not triggered yet
1
Interrupt is triggered
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TABLE 6. RANGE/FSR LUX
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ISL29033
Data Registers (02 Hex and 03 Hex)
Integration and Conversion Time
The device has two 8-bit read-only registers to hold the data from
LSB to MSB for the ADC (Table 7). The Most Significant Bit (MSB)
is accessed at 03 hex and the Least Significant Bit (LSB) is
accessed at 02 hex. For 16-bit resolution, the data is from D0 to
D15; for 12-bit resolution, the data is from D0 to D11; for 8-bit
resolution, the data is from D0 to D7. The registers are refreshed
after every conversion cycle.
ADC resolution and fOSC determine the integration time, tint, as
shown in Equation 4.
TABLE 7. DATA REGISTERS
ADDRESS
(HEX)
R EXT
n
n
1
t int = 2  -------------- = 2  ---------------------------------------------655kHz  499k
f OSC
In this equation, n is the number of bits of resolution and n = 4, 8,
12 or 16. Therefore, 2n is the number of clock cycles. The value
of n can be programmed at the command register, Register 01
hex, Bits 3 and 2 see (Table 8).
TABLE 8. INTEGRATION TIME OF n-BIT ADC
CONTENTS
02
D0 is LSB for 4-, 8-, 12- or 16-bit resolution; D3 is MSB for
4-bit resolution; D7 is MSB for 8-bit resolution
03
D15 is MSB for 16-bit resolution; D11 is MSB for 12-bit
resolution
Interrupt Registers (04, 05, 06 and 07 Hex)
Registers 04 and 05 hex set the Low (LO) threshold for the
interrupt pin and the interrupt flag. Register 04 hex is the LSB
and Register 05 hex is the MSB. By default, the interrupt
threshold LO is 00 hex for both LSB and MSB.
Registers 06 and 07 hex set the High (HI) threshold for the
interrupt pin and the interrupt flag. Register 06 hex is the LSB
and Register 07 hex is the MSB. By default, the interrupt
threshold HI is FF hex for both LSB and MSB.
Calculating Lux
The ISL29033 ADC output codes, DATA, are directly proportional
to lux in ambient light sensing, as shown in Equation 1.
E cal =   DATA
(EQ. 1)
In this equation, Ecal is the calculated lux reading. The constant,
α, is determined by the full scale range and the ADC maximum
output counts. The constant is independent of the light sources
(fluorescent, incandescent and sunlight) because the light source
IR component is removed during the light signal process. The
constant can also be viewed as the sensitivity (the smallest lux
measurement the device can measure), as shown in Equation 2.
Range  k 
 = ---------------------------Count max
(EQ. 2)
In this equation, Range(k) is as defined in Table 6. Countmax is
the maximum output counts from the ADC.
The transfer function used for n-bits ADC is as shown in
Equation 3:
Range  k 
E cal = ---------------------------  DATA
n
2
(EQ. 4)
(EQ. 3)
REXT
(kΩ)
n = 16-BIT
(ms)
n = 12-BIT
(ms)
n = 8-BIT
(µs)
n = 4-BIT
(µs)
499
100
6.25
391
24
1000
200
12.5
782
48
External Scaling Resistor REXT for fOSC and
Range
The ISL29033 uses an external resistor, REXT, to fix its internal
oscillator frequency, fOSC and the light sensing range, Range. The
fOSC and Range are inversely proportional to REXT. For ease of
use, the proportionality constant is referenced to 499kΩ.
Calculation for Range is shown in Equation 5 and for fOSC in
Equation 6.
499k
Range = ------------------  Range  k 
R EXT
(EQ. 5)
499k
f OSC = ------------------  655 kHz
R EXT
(EQ. 6)
Noise Rejection
In general, integrating-type ADCs have excellent noise rejection
characteristics for periodic noise sources for which, frequency is
an integer multiple of the conversion rate. For example, a 60Hz
AC unwanted signal’s sum from 0ms to k*16.66ms (k = 1, 2...ki)
is zero. Similarly, setting the device’s integration time to be an
integer multiple of the periodic noise signal greatly improves the
light sensor output signal in the presence of noise.
ADC Output in IR Sensing
The ISL29033 ADC output codes, DATA, are directly proportional
to the IR intensity received in IR sensing, as shown in Equation 7.
DATA IR =   E IR
(EQ. 7)
In this equation, EIR is the received IR intensity. The constant, ß,
changes with the spectrum of background IR noise, such as
sunlight and incandescent light. The constant, ß, also changes
with ADC range and resolution selections.
In this equation, n = 4, 8, 12 or 16 and is the number of ADC bits
programmed in the command register. The number 2n
represents the maximum number of counts possible from the
ADC output. Data is the ADC output stored in data
Registers 02 hex and 03 hex.
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ISL29033
Suggested PCB Footprint
It is important that users check TB477, “Surface Mount Assembly
Guidelines for Optical Dual FlatPack No Lead (ODFN) Package”
before starting ODFN product board mounting.
Layout Considerations
The ISL29033 is relatively insensitive to layout. Like other I2C
devices, it is intended to provide excellent performance even in
significantly noisy environments. Attention to a few
considerations will ensure best performance.
Route the supply and I2C traces as far as possible from all
sources of noise. Use two power-supply decoupling capacitors,
1µF and 0.1µF, placed close to the device.
Soldering Considerations
Convection heating is recommended for reflow soldering;
direct-infrared heating is not recommended. The plastic ODFN
package does not require a custom reflow soldering profile; it is
qualified to +260°C. A standard reflow soldering profile with a
+260°C maximum is recommended.
ALS Sensor Window Layout
Special care should be taken to ensure that the sensor, as shown
in the sensor location outline (Figure 6), is uniformly illuminated.
Shadows from off-angle window openings can affect uniform
illumination, which in turn can affect measurement results.
Typical Circuit
A typical application for the ISL29033 is shown in Figure 5. The
ISL29033 I2C address is internally hardwired as 1000100. The
device can be tied onto a system’s I2C bus together with other
I2C compliant devices.
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ISL29033
1.7V TO 3.63V
R1
10k
R2
10k
I2C MASTER
R3
RES1
MICROCONTROLLER
SDA
SCL
INT
2.25V TO 3.63V
I2C SLAVE_0
1
2
C1
1µF
C2
0.1µF
3
VDD
SDA
GND
SCL
REXT
INT
I2C SLAVE_1
I2C SLAVE_n
6
SDA
SDA
5
SCL
SCL
4
ISL29033
REXT
499kΩ
SENSOR OFFSET
FIGURE 5. ISL29033 TYPICAL CIRCUIT
1
6
2
5
0.40
0.54
4
3
0.37
FIGURE 6. 6 LD ODFN SENSOR LOCATION OUTLINE
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ISL29033
Typical Performance Curves
VDD = 3.0V, REXT = 499kΩ.
1.0
1.0
FLUORESCENT
0.8
0.7
0.6
HALOGEN
0.5
INCANDESCENT
SUN
0.4
HUMAN EYE
0.9
NORMALIZED RESPONSE
NORMALIZED INTENSITY
0.9
0.3
0.2
IR SENSING
0.8
ALS
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.1
0
350
550
750
0.0
300
950
400
500
600
FIGURE 7. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED BY
LUMINOUS INTENSITY (LUX)
ERROR PERCENT FULL SCALE (%)
NORMALIZED SENSITIVITY
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
15
1000
1100
30
45
60
75
90
4
3
2
MAX
1
0
-1
MIN
-2
-3
-4
-5
0
20
40
60
80
100
120
LUX METER (LUX)
FIGURE 9. ANGULAR SENSITIVITY
FIGURE 10. LINEARITY OVER RANGE 1
20
70000
18
16
ADC READING (COUNTS)
ADC READING (COUNTS)
900
5
ANGULAR OFFSET (°)
14
12
500kΩ
10
8
6
4
2
0
800
FIGURE 8. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT
LIGHT SENSING
1.0
0.0
-90 -75 -60 -45 -30 -15
700
WAVELENGTH (nm)
WAVELENGTH (nm)
50000
40000
0.005
0.01
0.015
LUX METER (LUX)
FIGURE 11. LOW LUX AT GREEN LED (500kΩ)
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0.02
HALOGEN
30000
INCANDESCENT LIGHT
20000
10000
0
0
FLUORESCENT LIGHT
60000
0
10
20
30
40
50
60
70
80
90
100
LUX READING (LUX)
FIGURE 12. LIGHT SOURCES AT RANGE 1, 500kΩ REXT
FN7656.4
April 21, 2016
ISL29033
VDD = 3.0V, REXT = 499kΩ. (Continued)
10
45
8
40
ADC READING (COUNTS)
ALS OUTPUT CHANGE
FROM +25°C MEASUREMENT (%)
Typical Performance Curves
6
4
2
500k, 30LUX NORMALIZED
0
-2
-4
-6
35
30
25
15
10
5
-8
-10
-60
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
0
100
0.005
0.010
0.015
0.020
FIGURE 14. LOW LUX AT GREEN LED (1MΩ)
10
ALS OUTPUT CHANGE
FROM +25°C MEASUREMENT (%)
70000
ADC READING (COUNTS)
0
LUX METER (LUX)
FIGURE 13. 500kΩ ALS COUNT, 30 LUX NORMALIZED
FLUORESCENT LIGHT
60000
50000
40000
HALOGEN
30000
20000
INCANDESCENT LIGHT
10000
0
1MΩ
20
0
10
20
30
40
8
6
4
2
-2
-4
-6
-8
-10
-60
50
1M, 20 LUX NORMALIZED
0
-40
-20
LUX READING (LUX)
0
20
40
60
80
100
TEMPERATURE (°C)
FIGURE 16. 1MΩ ALS COUNTS, 30 LUX NORMALIZED
FIGURE 15. LIGHT SOURCES AT RANGE 1, 1MΩ REXT
90
80
70
500kΩ
IDD (µA)
60
50
40
1MΩ
30
20
10
0
2.25
2.75
3.25
3.75
VDD (V)
FIGURE 17. SUPPLY CURRENT vs VDD ALS SENSING
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ISL29033
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please go to web to make sure you have the latest Rev.
DATE
REVISION
CHANGE
April 21, 2016
FN7656.4
Removed AN1422 reference on page 1.
December 16, 2015
FN7656.3
Ambient Light on page 6: Removed mention of “once mode” in Principles of Operation/Ambient Light.
Command Register I 00 (Hex) on page 8: Split section 1 under Register Set/Command Register I into 2 sections.
Updated POD L6.2x2.1 to most current version changes are as follows:
Change Note 5 From: Tiebar shown (if present) is a non-functional feature.
To: Tiebar shown (if present) is a non-functional feature and may be located on any of the 4 sides (or ends).
Updated Arrows to correct arrow type.
September 26, 2012
FN7656.2
Corrected horizontal axis in Figure 9 on page 12 from 0 to 40 to -90 to 90.
September 21, 2011
FN7656.1
Changed Title on page 1 from “Integrated Digital Ambient Light Sensor with Interrupt Function” to “Ultra-Low
Lux, Low Power, Integrated Digital Ambient Light Sensor with Interrupt Function”
August 25, 2011
FN7656.0
Initial Release
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ISL29033
Package Outline Drawing
L6.2x2.1
6 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN)
Rev 4, 2/15
2.10
A
B
6
PIN 1
INDEX AREA
1
6
PIN #1
INDEX AREA
0.65
1.35
2.00
1.30 REF
4 6x0.30 ±0.05
(4X)
0.10
0.10 M C A B
0.65
6x0.35 ±0.05
TOP VIEW
BOTTOM VIEW
2.50
PACKAGE
OUTLINE
2.10
SEE DETAIL "X"
0.65
(4x0.65)
0.10 C
MAX 0.75
C
BASE PLANE
SEATING PLANE
0.08 C
SIDE VIEW
(1.35)
0.2 REF
(6x0.30)
5
C
(6x0.20)
(6x0.55)
0.00 MIN.
0.05 MAX.
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to ASME Y14.5m-1994.
3.
Unless otherwise specified, tolerance: Decimal ± 0.05
4.
Dimension applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5.
Tiebar shown (if present) is a non-functional feature and
maybe located on any of the 4 sides (or ends).
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
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