ISL29034 Datasheet
DATASHEET
Integrated Digital Light Sensor
ISL29034
Features
The ISL29034 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 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.
• Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-bit ADC
For ambient light sensing, an internal 16-bit ADC has been
designed based upon the charge-balancing technique. The
ADC conversion time is nominally 105ms and is user
selectable from 11µs to 105ms, depending on oscillator
frequency and ADC resolution. In normal operation, typical
current consumption is 57µA. In order to further minimize
power consumption, two power-down modes have been
provided. If polling is chosen over continuous measurement of
light, the auto power-down function shuts down the whole chip
after each ADC conversion for the measurement. The other
power-down mode is controlled by software via the I2C
interface. The power consumption can be reduced to less than
0.3µA when powered down.
The ISL29034 supports a software brownout condition
detection. The device powers up with the brownout bit asserted
until the host clears it through the I2C interface. Designed to
operate on supplies from 2.25V to 3.63V with an I2C supply from
1.7V to 3.63V, the ISL29034 is specified for operation across the
-40°C to +85°C ambient temperature range.
• Wide dynamic range1: . . . . . . . . . . . . . . . . . . . . . . . . . . 4,200,000
• Integrated noise reduction . . . . . . . . . . . . . . . . . . . . . 50/60Hz
• Close to human eye response with excellent IR/UV rejection
• Shutdown modes. . . . . . . . . . . . . . . . . . . .software and automatic
• Supply current (typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . 57µA
• Shutdown current (maximum) . . . . . . . . . . . . . . . . . . . 0.51µA
• I2C (SMB compatible) power supply . . . . . . . . . 1.7V to 3.63V
• Sensor power supply . . . . . . . . . . . . . . . . . . . . . 2.25V to 3.63V
• Operating temperature range. . . . . . . . . . . . . -40°C to +85°C
• Small form factor package . . . . . . . 4 Ld 1.5x1.3x0.75 ODFN
Applications
• Mobile devices: smart phone, PDA, GPS
• Computing devices: notebook PC, MacBook, tablets
• 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 Sensor”
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
ALS SENSING
INTERRUPT PIN
NUMBER OF
PINS
ISL29034
Yes
No
4 Ld
ISL29035
Yes
Yes
6 Ld
PART NUMBER
1.2
100
VDD
VDD_PULLUP
1µF
1
4.7k
4.7k
1.0
HUMAN EYE
0.8
AMBIENT LIGHT SENSOR
VDD
0.6
SDA
4
SDA
ISL29034
MCU
SCL
3
0.4
SCL
0.2
GND
2
0
300
400
500
600
700
800
900
1000
1100
WAVELENGTH (nm)
FIGURE 1. ISL29034 TYPICAL APPLICATION DIAGRAM
August 19, 2016
FN8370.2
1
FIGURE 2. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT
LIGHT SENSING
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013, 2014, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL29034
Block Diagram
VDD
1
IREF
COMMAND
REGISTER
fOSC
R
500k
PHOTODIODE
ARRAY
CMD
I2C/SMB
Register
LIGHT
DATA
PROCESS
INTEGRATING
ADC
3 SCL
4 SDA
DATA
REGISTER
ISL29034
2
GND
FIGURE 3. BLOCK DIAGRAM
Pin Configuration
Pin Descriptions
ISL29034
(4 LD ODFN)
TOP VIEW
VDD
1
4
SDA
GND
2
3
SCL
PIN
NUMBER
PIN NAME
1
VDD
Positive supply
2
GND
Ground pin
3
SCL
I2C serial clock.
4
SDA
I2C serial data.
DESCRIPTION
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL29034IROZ-T7
ISL29034IROZ-EVALZ
TEMP RANGE
(°C)
TAPE AND REEL
(UNITS)
-40 to +85
3k
PACKAGE
(RoHS COMPLIANT)
4 Ld ODFN
PKG.
DWG. #
L4.1.5x1.3
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 ISL29034. For more information on MSL please see tech brief TB477.
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ISL29034
Absolute Maximum Ratings
Thermal Information
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
I2C Bus (SCL, SDA) Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . -0.2V to 4.0V
I2C Bus (SCL, SDA) Pin Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
Input Voltage Slew Rate (Maximum) . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1V/µs
ESD Ratings
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
Thermal Resistance (Typical)
JA (°C/W)
287
4 Ld ODFN Package (Note 4) . . . . . . . . . . . . . . . . . . . . .
Maximum Junction Temperature (TJMAX). . . . . . . . . . . . . . . . . . . . . . . +90°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-40°C to +100°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB477
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:
4. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
VDD = 3.0V, TA = +25°C, 16-bit ADC operation, unless otherwise specified.
PARAMETER
SYMBOL
Power Supply Range
VDD
Supply Current
IDD
Supply Current when Powered Down
IDD1
Supply Voltage Range for I2C Interface
VI2C
ADC Integration/Conversion Time
tint
I2C Clock Rate Range
FI2C
Count Output When Dark
DATA_0
Full-Scale ADC Code
DATA_F
Part-to-Part Variation (3 population)
%/Value
TEST CONDITIONS
MIN
(Note 7)
MAX
(Note 7)
UNIT
3.63
V
57
85
µA
0.24
0.51
µA
3.63
V
TYP
2.25
Software disabled or auto power-down
1.70
16-bit ADC data
E = 0 Lux, Range 0 (1k Lux)
105
ms
400
kHz
1
E = 300 Lux, cold white LED
Range 0 (1k Lux)
5
Counts
65535
Counts
±5
15000
20473
%
Light Count Output with LSB of 0.015 Lux/Count
ADCR0
E = 300 Lux, fluorescent light (Note 5),
ALS Range 0 (1k Lux)
25000
Counts
Light Count Output with LSB of 0.06 Lux/Count
ADCR1
E = 300 Lux, fluorescent light (Note 5),
ALS Range 1 (4k Lux)
5100
Counts
Light Count Output with LSB of 0.24 Lux/Count
ADCR2
E = 300 Lux, fluorescent light (Note 5),
ALS Range 2 (16k Lux)
1400
Counts
Light Count Output with LSB of 0.96 Lux/Count
ADCR3
E = 300 Lux, fluorescent light (Note 5),
ALS Range 3 (64k Lux)
366
Counts
Infrared Count Output (Note 6)
ADC_IRR0
Range 0 (1k Lux)
Infrared Count Output (Note 6)
ADC_IRR1
Range 1 (4k Lux)
481
Counts
Infrared Count Output (Note 6)
ADC_IRR2
Range 2 (16k Lux)
148
Counts
Infrared Count Output (Note 6)
ADC_IRR3
Range 3 (64k Lux)
42
Counts
SDA Current Sinking Capability
ISDA
5
mA
1402
4
1997
2598
Counts
NOTES:
5. 550nm green LED is used in production test. The 550nm LED irradiance is calibrated to produce the same DATA count against an illuminance level
of 300 Lux fluorescent light.
6. 850 nm IR LED is used in production test.
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
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ISL29034
I2C Interface Specifications
F
PARAMETER
SYMBOL
SDA and SCL Input Buffer LOW Voltage
VIL
SDA and SCL Input Buffer HIGH Voltage
VIH
SDA and SCL Input Buffer Hysteresis
VHys
(Note 8)
SDA Output Buffer LOW Voltage
(open-drain), Sinking 4mA
VOL
(Note 8)
SDA and SCL Pin Capacitance
CPIN
(Note 8)
VDD = 3.0V, TA = +25°C, 16-bit ADC operation, unless otherwise specified.
TEST CONDITIONS
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
0.55
V
1.25
V
V
0.05 x VDD
0
TA = +25°C, f = 1MHz, VDD = 5V,
VIN = 0V, VOUT = 0V
0.06
0.40
V
10
pF
400
kHz
50
ns
900
ns
SCL Frequency
fSCL
Pulse Width Suppression Time at SDA and
SCL Inputs
tIN
SCL Falling Edge to SDA Output Data Valid
tAA
Time the Bus Must be Free Before the Start
of a New Transmission
tBUF
1300
ns
Clock LOW Time
tLOW
1300
ns
Clock HIGH Time
tHIGH
600
ns
START Condition Set-Up Time
tSU:STA
600
ns
START Condition Hold Time
tHD:STA
600
ns
Input Data Set-Up Time
tSU:DAT
100
ns
Input Data Hold Time
tHD:DAT
30
ns
STOP Condition Set-Up Time
tSU:STO
600
ns
STOP Condition Hold Time
tHD:STO
600
ns
Output Data Hold Time
tDH
0
ns
SDA and SCL Rise Time
tR
(Note 8)
20 + 0.1 x Cb
ns
SDA and SCL Fall Time
tF
(Note 8)
20 + 0.1 x Cb
ns
Capacitive Loading of SDA or SCL
Cb
(Note 10)
Total on-chip and off-chip
SDA and SCL Bus Pull-Up Resistor Off-chip
RPU
(Note 8)
Maximum is determined by tR and tF
For Cb = 400pF, maximum is about
2kΩ ~2.5kΩ
For Cb = 40pF, maximum is about
15kΩ ~ 20kΩ
Any pulse narrower than the maximum
specification is suppressed
400
1
pF
kΩ
NOTES:
8. Limits should be considered typical and are not production tested.
9. These are I2C specific parameters and are not tested, however, they are used to set conditions for testing devices to validate specification.
10. Cb is the capacitance of the bus in pF.
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SDA vs SCL Timing
tHIGH
tLOW
tF
SCL
tHD:STO
tR
tSU:DAT
tSU:STA
tHD:DAT
tHD:STA
SDA
(INPUT TIMING)
tSU:STO
tAA
tDH
tBUF
SDA
(OUTPUT TIMING)
FIGURE 4. I2C BUS TIMING
SCL
SDA
8TH BIT OF LAST BYTE
ACK
tWC
STOP
CONDITION
START
CONDITION
FIGURE 5. I2C WRITE CYCLE TIMING
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Typical Performance Curves
1.2
1.0
NORMALIZED SENSITIVITY
1.2
HUMAN EYE
0.8
AMBIENT LIGHT SENSOR
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
0
300
400
500
600
700
800
900
1000
0
-60 -50
1100
-40
-30
-20
WAVELENGTH (nm)
10
20
30
40
50
60
FIGURE 7. NORMALIZED RADIATION PATTERN
14
1000
1000 LUX RANGE
ALS MEASURED LUX (LUX)
ALS READING (COUNTS)
0
ANGLE (°)
FIGURE 6. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT
LIGHT SENSING
12
-10
10
8
6
4
2
0
-60 -50 -40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
FIGURE 8. TEMPERATURE TEST IN DARK CONDITION
Principles of Operation
Photodiodes and ADC
The ISL29034 contains two photodiode arrays, which convert light
into current. A typical spectral response for ambient light sensing is
shown in Figure 6 on page 6. 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 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 105ms integration
time, for instance, highly rejects 50Hz and 60Hz power line noise
simultaneously.
The integration time of the built-in ADC is determined by the internal
oscillator, and the n-bit (n = 4, 8, 12, 16) counter inside the ADC. A
good balancing act of integration time and resolution (depending on
the application) is required for optimal results.
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800
1000 LUX RANGE
600
400
200
0
0
200
400
600
800
1000
AMBIENT LIGHT (LUX)
FIGURE 9. ALS TRANSFER FUNCTION
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 0) in the ambient light sensing.
Low-Power Operation
The ISL29034 initial operation is at the power-down mode after a
supply voltage is provided. The data registers contain the default
value at 0. When the ISL29034 receives an I2C command to do a
one-time measurement from an I2C master, it will start the ADC
conversion with light sensing. It will go to the power-down mode
automatically after one conversion is finished and keep the
conversion data available for the master to fetch anytime
afterwards. The ISL29034 will continuously do ADC conversion
with light sensing if it receives an I2C command of continuous
measurement. It will continuously update the data registers with
the latest conversion data. It will go to the power-down mode
after it receives the I2C command of power-down.
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ISL29034
Ambient Light and IR Sensing
There are four operational modes in ISL29034: Programmable
ALS once with auto power-down, programmable IR sensing once
with auto power-down, programmable continuous ALS sensing
and programmable continuous IR sensing. These four modes can
be programmed in series to fulfill the application needs. The
detailed program configuration is listed in “Command-I Register
(Address: 0x00)” on page 9.
When the part is programmed for ambient light sensing, the
ambient light with wavelength within the “Ambient Light
Sensing” spectral response curve in Figure 15 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
curve in Figure 15 is converted into current. With ADC, the
current is converted to an unsigned n-bit (up to 16 bits) digital
output.
Serial Interface
The ISL29034 supports the Inter-Integrated Circuit (I2C) bus data
transmission protocol. The I2C bus is a two-wire serial bidirectional
interface consisting of SCL (Clock) and SDA (Data). Both the wires
are connected to the device supply via pull-up resistors. The I2C
protocol defines any device that sends data onto the bus as a
transmitter and the receiving device as the receiver. The device
controlling the transfer is a master and the device being controlled is
the slave. The transmitting device pulls down the SDA line to
transmit a “0” and releases it to transmit a “1”. The master always
initiates the data transfer, only when the bus is not busy, and
provides the clock for both transmit and receive operations. The
ISL29034 operates as a slave device in all applications. The serial
communication over the I2C interface is conducted by sending the
Most Significant Bit (MSB) of each byte of data first.
Start Condition
During data transfer, the SDA line must remain stable while the SCL
line is HIGH. All I2C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while SCL is
HIGH (refer to Figure 12 on page 8). The ISL29034 continuously
monitors the SDA and SCL lines for the START condition and does
not respond to any command until this condition is met (refer to
Figure 12). A START condition is ignored during the power-up
sequence.
Stop Condition
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while SCL is
HIGH (refer to Figure 12). A STOP condition at the end of a
read/write operation places the device in its standby mode. If a
stop is issued in the middle of a Data byte, or before 1 full Data
byte + ACK is sent, then the serial communication of the
ISL29034 resets itself without performing the read/write. The
contents of the array are not affected.
Acknowledge
An Acknowledge (ACK) is a software convention used to indicate
a successful data transfer. The transmitting device releases the
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SDA bus after transmitting 8 bits. During the ninth clock cycle,
the receiver pulls the SDA line LOW to acknowledge the reception
of the eight bits of data (refer to Figure 12). The ISL29034
responds with an ACK after recognition of a START condition
followed by a valid Identification Byte, and once again, after
successful receipt of an Address Byte. The ISL29034 also
responds with an ACK after receiving a Data byte of a write
operation. The master must respond with an ACK after receiving
a Data byte of a read operation.
Device Addressing
Following a START condition, the master must output a Device
Address byte. The 7 MSBs of the Device Address byte are known as
the device identifier. The device identifier bits of the ISL29034 are
internally hard-wired as “1000100”. The LSB of the Device Address
byte is defined as a Read or Write (R/W) bit. When this R/W bit is a
“1”, a read operation is selected and when “0”, a write operation is
selected (refer to Figure 10). The master generates a START
condition followed by Device Address byte 1000100x (x as R/W)
and the ISL29034 compares it with the internal device identifier.
Upon a correct comparison, the device outputs an acknowledge
(LOW) on the SDA line (refer to Figure 12).
1
0
0
0
1
0
0
R /W
D E V IC E A D D R E S S
BYTE
A7
A6
A5
A4
A3
A2
A1
A0
R E G IS T E R
ADDRESS BYTE
D7
D6
D5
D4
D3
D2
D1
D0
DATA BYTE
FIGURE 10. DEVICE ADDRESS, REGISTER ADDRESS AND DATA BYTE
Write Operation
BYTE WRITE
In a byte write operation, the ISL29034 requires the Device
Address byte, Register Address byte, and the Data byte. The
master starts the communication with a START condition. Upon
receipt of the Device Address byte, Register Address byte and the
Data byte, the ISL29034 responds with an Acknowledge (ACK).
Following the ISL29034 data acknowledge response, the master
terminates the transfer by generating a STOP condition.
The ISL29034 then begins an internal write cycle of the data to
the volatile memory. During the internal write cycle, the device
inputs are disabled and the SDA line is in a high impedance state,
so the device will not respond to any requests from the master
(refer to Figure 11).
BURST WRITE
The ISL29034 has a burst write operation, which allows the
master to write multiple consecutive bytes from a specific
address location. It is initiated in the same manner as the byte
write operation, but instead of terminating the write cycle after
the first Data byte is transferred, the master can write to the
whole register array. After the receipt of each byte, the ISL29034
responds with an acknowledge, and the address is internally
incremented by one. The address pointer remains at the last
address byte written. When the counter reaches the end of the
register address list, it “rolls over” and goes back to the first
Register Address.
FN8370.2
August 19, 2016
ISL29034
SIGNAL FROM
MASTER DEVICE
SIGNAL AT SDA
S
T
DEVICE ADDRESS
A
BYTE
R
T
1 0 0 0 1 0 0 0
ADDRESS BYTE
A
C
K
SIGNALS FROM
SLAVE DEVICE
S
T
O
P
DATA BYTE
A
C
K
A
C
K
FIGURE 11. BYTE WRITE SEQUENCE
SCL FROM
MASTER
8th CLK
9th CLK
HIGH
IMPEDANCE
SDA FROM
TRANSMITTER
SDA FROM
RECEIVER
START
DATA
STABLE
DATA
CHANGE
DATA
STABLE
ACK
STOP
FIGURE 12. START, DATA STABLE, ACKNOWLEDGE AND STOP CONDITION
Power-On Reset
Read Operation
The ISL29034 has two basic read operations: Byte read and
Burst read.
BYTE READ
Byte read operations allow the master to access any register
location in the ISL29034. The Byte read operation is a two step
process. The master issues the START condition, and the Device
Address byte with the R/W bit set to “0”, receives an
acknowledge, then issues the Register Address byte. After
acknowledging receipt of the Register Address byte, the master
immediately issues another START condition and the Device
Address byte with the R/W bit set to “1”. This is followed by an
acknowledge from the device and then by the 8-bit data word.
The master terminates the read operation by not responding with
an acknowledge and then issuing a stop condition
(refer to Figure 13).
The Power-On Reset (POR) circuitry protects the internal logic
against powering up in the incorrect state. The ISL29034 will
power-up into Standby mode after VDD exceeds the POR trigger
level and will power-down into Reset mode when VDD drops
below the POR trigger level. This bidirectional POR feature
protects the device against ‘brown-out’ failure following a
temporary loss of power.
The POR is an important feature because it prevents the
ISL29034 from starting to operate with insufficient voltage, prior
to stabilization of the internal bandgap. The ISL29034 prevents
communication to its registers and greatly reduces the likelihood
of data corruption on power-up.
BURST READ
Burst read operation is identical to the Byte read operation. After
the first Data byte is transmitted, the master now responds with
an acknowledge, indicating it requires additional data. The
device continues to output data for each acknowledge received.
The master terminates the read operation by not responding with
an acknowledge but issuing a STOP condition (refer to Figure 14).
For more information about the I2C standard, please consult the
Phillips™ I2C specification documents.
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ISL29034
S
T
A DEVICE ADDRESS
WRITE
R
T
1 0 0 0 1 0 0 0
SIGNAL FROM
MASTER DEVICE
SIGNAL AT SDA
S
T
A DEVICE ADDRESS
READ
R
T
1 0 0 0 1 0 0 1
ADDRESS BYTE
A
C
K
SIGNALS FROM
SLAVE DEVICE
A
C
K
S
T
O
P
DATA BYTE
A
C
K
FIGURE 13. BYTE ADDRESS READ SEQUENCE
S
T
A
R
T
SIGNAL FROM
MASTER DEVICE
DEVICE
ADDRESS
WRITE
S
T
A
DEVICE
R ADDRESS READ
T
1 0 0 0 1 0 0 1
ADDRESS BYTE
1 0 0 0 1 0 0 0
SIGNAL AT SDA
A
C
K
SIGNALS FROM
SLAVE DEVICE
A
C
K
DATA BYTE 2
DATA BYTE 1
A
C
K
A
C
K
S
T
O
P
DATA BYTE n
A
C
K
(n IS ANY INTEGER
GREATER THAN 1)
FIGURE 14. BURST READ SEQUENCE
TABLE 2. REGISTER MAP
REGISTER
ADDRESS
REGISTER BITS
NAME
DEC
HEX
B7
B6
B5
COMMAND-I
0
0x00
OP2
OP1
OP0
COMMAND-II
1
0x01
DATALSB
2
0x02
D7
D6
D5
DATAMSB
3
0x03
D15
D14
ID
15
0x0F
BOUT
RESERVED
B4
B3
RESERVED
B0
DEFAULT
ACCESS
0x00
RW
RES1
RES0
RANGE1
RANGE0
0x00
RW
D4
D3
D2
D1
D0
0x00
RO
D13
D12
D11
D10
D9
D8
0x00
RO
1
0
1
1x101xxx
RW
Following are detailed descriptions of the control registers related to
the operation of the ISL29034 ambient light sensor device. These
registers are accessed by the I2C serial interface. For details on the
I2C interface, refer to “Serial Interface” on page 7.
All the features of the device are controlled by the registers. The ADC
data can also be read. The following sections explain the details of
each register bit. All RESERVED bits are Intersil used bits ONLY. The
value of the reserved bit can change without notice.
Decimal to Hexadecimal Conversion
To convert decimal value to hexadecimal value, divide the decimal
number by 16, and write the remainder on the side as the least
significant digit. This process is continued by dividing the quotient by
16 and writing the remainder until the quotient is 0. When
performing the division, the remainders, which will represent the
hexadecimal equivalent of the decimal number, are written
beginning with the least significant digit (right) and each new digit is
written to the next most significant digit (the left) of the previous
digit. Consider the number 175 decimal.
9
B1
RESERVED
Register Description
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B2
RESERVED
TABLE 3. DECIMAL TO HEXADECIMAL
DIVISION
QUOTIENT
REMINDER
HEX NUMBER
175/16
10 = A
15 = F
0xAF
Command-I Register (Address: 0x00)
TABLE 4. COMMAND-I REGISTER ADDRESS
NAME
ADDR
(HEX) B7
REGISTER BITS
B6
B5
COMMAND-I 0x00 OP2 OP1 OP0
B4 B3 B2
B1
RESERVED
B0
DFLT
(HEX)
0x00
The Command-I register consists three operation mode bits. The
default register value is 0x00 at power-on.
Command-I Register (Address: 0x0 Operation Mode Bits[7:5])
The ISL29034 has different operating modes. These modes are
selected by setting B7 to B5 bits on register address 0x00. The
device powers up on a disable mode. Table 5 on page 10 lists the
possible operating modes.
FN8370.2
August 19, 2016
ISL29034
.
TABLE 5. OPERATING MODES BITS
B7
B6
B5
0
0
0
0
0
0
OPERATION
TABLE 8. ADC RESOLUTION DATA WIDTH
B3
B2
Power-down the device (Default)
0
0
216 = 65,536
16
1
The device measures ALS only once every integration
cycle. This is the lowest operating mode. (Note 11)
0
1
212 = 4,096
12
1
0
28 = 256
8
1
0
IR once
1
1
24 = 16
4
0
1
1
Reserved (Do Not Use)
1
0
0
Reserved (Do Not Use)
1
0
1
Measures ALS continuously
1
1
0
Measures IR continuous
1
1
1
Reserved (Do Not Use)
TABLE 9. INTEGRATION TIME OF n-BIT ADC
n # ADC BITS
INTEGRATION TIME (ms)
4
0.022
8
0.352
12
5.6
16
105
Command-II Register (Address: 0x01)
TABLE 6. COMMAND-II REGISTER BITS
REGISTER BITS
REG.
ADDR
B1
(HEX) B7 B6 B5 B4 B3 B2
COMMAND 0x01
-II
RESERVED
n-BIT ADC
Integration Time
NOTE:
11. Intersil does not recommend using this mode
NAME
NUMBER OF CLOCK CYCLES
Data Registers (Addresses: 0x02 and 0x03)
B0
TABLE 10. ADC REGISTER BITS
DFLT
(HEX)
RES RES RANGE RANGE 0x00
1
0
1
0
The Command-II register consists of ADC control bits. In this
register, there are two range bits and two ADC resolution bits.
The default register value is 0x00 at power-on.
FULL SCALE LUX RANGE [B1:B0]
The full scale Lux range has four different selectable ranges. The
range determines the full scale Lux range (1k, 4k, 16k, and 64k).
Each range has a maximum allowable Lux value. Table 7 lists the
possible values of FSR.
TABLE 7. RANGE REGISTER BITS
REGISTER BITS
Reg.
Addr
(HEX)
B7
B6
B5
B4
B3
B2
B1
DFLT
B0 (HEX)
DATALSB 0x02
D7
D6
D5
D4
D3
D2
D1
D0
0x00
DATAMSB 0x03 D15 D14 D13 D12 D11 D10
D9
D8
0x00
NAME
The ISL29034 has two 8-bit read-only registers to hold the upper
and lower byte of the ADC value. The Upper byte is accessed at
Address 0x03 and the Lower byte is accessed at Address 0x02.
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 and for 4-bit resolution, the data is from
D0 to D3. The registers are refreshed after every conversion
cycle. The default register value is 0x00 at power-on.
RANGE
SELECTION
B1
B0
FULL SCALE LUX RANGE
(LUX)
0
0
0
1,000
ADDRESS
(HEX)
1
0
1
4,000
0x02
2
1
0
16,000
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
3
1
1
64,000
0x03
D15 is MSB for 16-bit resolution; D11 is MSB for 12-bit
resolution
Integration Time ADC Resolution [B3:B2]
B2 and B3 determine the ADC’s resolution and the number of
clock cycles per conversion. 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 the device’s
Analog-to-Digital (A/D) converter samples the photodiode current
signal for a measurement. Table 8 lists the possible ADC
resolution. Only 16 bit ADC resolution can reject better
50Hz/60Hz noise flickering light source.
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10
TABLE 11. ADC DATA REGISTERS
CONTENTS
ID Register (Address: 0x0F)
TABLE 12. ID REGISTER BITS
ADDR
NAME (HEX)
ID
REGISTER BITS
B7
B6
0x0F BOUT RESERVED
B5 B4 B3 B2 B1 B0
1
0
1
DFLT
RESERVED 1x101xxx
The ID register has three different types of information.
FN8370.2
August 19, 2016
ISL29034
RESERVED BITS [B2:B0] AND [B6]
All RESERVED bits on the ISL29034 are Intersil used bits only.
Bit0 to Bit2 and Bit6 are RESERVED bits where their value might
change without any notification to the user. It is advised when
using the identification bits to identify the device in a syste, the
software should mask the Bit0 to Bit2 and Bit6 to Bit7 to properly
identify the device.
The ISL29034 provides 3 bits to identify the device in a system.
These bits are located on register address 0x0F, Bit3 to Bit5. The
identification bit value for the ISL29034 is xx101xxx. The device
identification bits are read only bits. It is important to notice that
Bit7 is a status bit for Brownout Condition (BOUT).
BROWNOUT STATUS BIT TO BOUT [B7]
Bit7 on register address 0x0F is a status bit for Brownout
Condition (BOUT). The default value of this bit is “BOUT = 1”
during the initial power-up, which indicates the device may
possibly have gone through a brownout condition. Therefore, the
status bit should be reset to “BOUT = 0” by an I2C write command
during the initial configuration of the device.
The default register value is 0xA8 at power-on.
Applications Information
Figure 15 is a normalized spectral response of various types of
light sources for reference.
1.0
NORMALIZED INTENSITY
0.9
FLUORESCENT
(EQ. 2)
Where, Range is defined in Table 7 on page 10. Countmax is the
maximum output counts from the ADC.
Where n = 4, 8, 12 or 16. This is the number of ADC bits
programmed in the command register. 2n represents the
maximum number of counts possible from the ADC output. Data is
the ADC output stored in the data registers (02 hex and 03 hex).
Enhancing EV Accuracy
The device has on-chip passive optical filter designed to block
(reject) most of the incident Infra Red. However, EV
measurement may be vary under differing IR-content light
sources. In order to optimize the measurement variation
between differing IR-content light sources, ISL29034 provides IR
channel, which is programmed at COMMAND-1 (Reg0x0) to
measure the IR level of differing IR-content light sources.
The ISL29034’s ADC output codes, DATA, are directly
proportional to the IR intensity received in the IR sensing.
DATA IR =   E IR
EV Accuracy = KxDATA EV +   DATA IR
0.7
0.6
HALOGEN
0.5
INCAND.
SUN
0.4
0.3
0.2
0.1
550
750
950
WAVELENGTH (nm)
FIGURE 15. NORMALIZED SPECTRAL RESPONSE OF LIGHT SOURCES
Calculating Lux
The ISL29034’s ADC output codes, DATA, are directly
proportional to Lux in the ambient light sensing.
(EQ. 1)
E cal =   DATA
Where Ecal is the calculated Lux reading. The constant  is
determined by the full-scale range and the ADC’s maximum
output counts. The constant is independent of the light sources
(fluorescent, incandescent and sunlight) because the light
sources IR component is removed during the light signal process.
11
(EQ. 3)
Range
E cal = -------------------  DATA
n
2
(EQ. 4)
Then EV accuracy can be found in Equation 5:
0.8
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Range
 = ---------------------------Count max
The transfer function used for n-bits ADC becomes:
DEVICE ID BITS [B5:B3]
0
350
The constant can also be viewed as the sensitivity (the smallest
Lux measurement the device can measure).
(EQ. 5)
Here, DATAEV is the received ambient light intensity ADC output
codes. K is a resolution of visible portion. Its unit is Lux/count.
The typical value of K is 0.82. DATAIR is the received IR intensity.
The constant  changes with the spectrum of background IR,
such as A, F2 and D65 (Notes 8, 9 and 10). The also changes
with the ADC’s range and resolution selections. A typical for
Range1 and Range2 is -11292.86 and Range3 and Range4 is
2137.14 without IR tinted glass.
Noise Rejection
Electrical AC power worldwide is distributed at either 50Hz or
60Hz. Artificial light sources vary in intensity at the AC power
frequencies. The undesired interference frequencies are infused
on the electrical signals. This variation is one of the main sources
of noise for the light sensors. Integrating type ADC’s have
excellent noise-rejection characteristics for periodic noise
sources whose frequency is an integer multiple of the conversion
rate. By setting the sensor’s integration time to an integer
multiple of periodic noise signal, the performance of an ambient
light sensor can be improved greatly in the presence of noise. In
order to reject the AC noise, the integration time of the sensor
must to adjusted to match the AC noise cycle. For instance, 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.
FN8370.2
August 19, 2016
ISL29034
Suggested PCB Footprint
Temperature Coefficient
It is important that users check TB477 “Surface Mount Assembly
Guidelines for Optical Dual Flat Pack No Lead (ODFN) Package”
before starting ODFN product board mounting.
The limits stated for Temperature Coefficient (TC) are governed
by the method of measurement. The “Box” method is usually
used for specifying the temperature coefficient. The
overwhelming standard for specifying the temperature drift of a
reference is to evaluate the maximum voltage change over the
specified temperature range. This yields ppm/°C, and is
calculated using Equation 4:
Board Mounting Considerations
For applications requiring the light measurement, the board
mounting location should be reviewed. The device uses an
Optical Dual Flat Pack No Lead (ODFN) package, which subjects
the die to mild stresses when the printed circuit (PC) board is
heated and cooled, which slightly changes the shape. Because of
these die stresses, placing the device in areas subject to slight
twisting can cause degradation of reference voltage accuracy. It
is normally best to place the device near the edge of a board, or
on the shortest side, because the axis of bending is most limited
in that location.
VHIGH is the maximum reference voltage over the temperature
range.
Layout Considerations
VLOW is the minimum reference voltage over the temperature
range.
The ISL29034 is relatively insensitive to layout. Like other I2C
devices, it is intended to provide excellent performance even in
significantly noisy environments. There are only a few
considerations that 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 and is
qualified to +260°C. A standard reflow soldering profile with a
+260°C maximum is recommended.
V HIGH – V LOW
6
TC = ----------------------------------------------------------------------------------  10
V NOMINAL   T HIGH – T LOW 
(EQ. 6)
Where:
VNOMINAL is the nominal reference voltage at +25°C.
THIGH - TLOW is the specified temperature range (°C).
Digital Inputs and Termination
The ISL29034 digital inputs are guaranteed to CMOS levels. The
internal register is updated on the rising edge of the clock.
To minimize reflections, proper termination should be
implemented. If the lines driving the clock and the digital inputs
are 50Ω lines, then 50Ω termination resistors should be placed
as close to the sensor inputs as possible, connected to the digital
ground plane (if separate grounds are used).
Typical Circuit
A typical application for the ISL29034 is shown in Figure 16. The
ISL29034’s I2C address is internally hard-wired as 1000100. The
device can be tied onto a system’s I2C bus together with other I2C
compliant devices.
100
VDD
VDD_PULLUP
1µF
4.7k
1
4.7k
VDD
SDA
4
SDA
ISL29034
MCU
SCL
3
SCL
GND
2
FIGURE 16. ISL29034 TYPICAL CIRCUIT
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12
FIGURE 17. 4 LD ODFN SENSOR LOCATION OUTLINE
FN8370.2
August 19, 2016
ISL29034
Revision History The revision history provided is for informational purposes only and is believed to be accurate, however, not
warranted. Please go to web to make sure you have the latest revision.
DATE
REVISION
CHANGE
August 19, 2016
FN8370.2
- Figure 2 on page 1: Updated y-axis titles.
- On page 4: Added typical value of VOL (0.06)
- On page 6: Corrected Figure 5 graph and label, corrected graph of Figure 6, corrected Figure 8 label (removed
under F2 light source).
- Added table of “key differences” on page 1.
- Updated the L4.1.5x1.3 Package Outline Drawing to the latest revision:
Tiebar Note updated
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).
April 9, 2014
FN8370.1
Initial Release
About Intersil
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For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
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13
FN8370.2
August 19, 2016
ISL29034
Package Outline Drawing
L4.1.5x1.3
4 LD 1.5X1.3 OPTICAL DUAL FLAT NO-LEAD (ODFN)
Rev 6, 4/15
1.50
(0.55)
A
6
PIN #1
INDEX AREA
B
6
PIN 1
INDEX AREA
1
4
1.30
0.50
0.25 ±0.07 4
3
2
(4X)
0.10
0.10 M C A B
3X 0 . 40 ± 0 . 10
TOP VIEW
BOTTOM VIEW
SEE DETAIL "X"
(0.55)
0.10 C
(3x0.60)
0.70 ±0.05
(0.75)
C
BASE PLANE
SEATING PLANE
4
1
(0.50)
0.08 C
SIDE VIEW
2
3
(4 x 0.25)
(1.30)
C
TYPICAL RECOMMENDED LAND PATTERN
0 . 2 REF
5
0 . 00 MIN.
0 . 05 MAX.
DETAIL "X"
NOTES:
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14
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4.
Dimension applies to the metallized terminal and is measured
between 0.18mm and 0.32mm from the terminal tip.
5.
Tiebar shown (if present) is a non-functional feature and may
be 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.
7.
This package not defined by JEDEC, but MO-229 can be used as
a general reference.
FN8370.2
August 19, 2016
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