DATASHEET

Low Power Ambient Light and Proximity Sensor with
Intelligent Interrupt and Sleep Modes - Analog and Digital
Out
ISL29030
Features
The ISL29030 is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED driver and I2C
Interface (SMBus Compatible). This device uses two
independent ADCs for concurrently measuring ambient light
and proximity in parallel. The flexible interrupt scheme is
designed for minimal microcontroller utilization.
• Works Under All Light Sources Including Sunlight
For ambient light sensor (ALS) data conversions, an ADC
converts photodiode current (with a light sensitivity range of
2000 Lux) in 100ms per sample. The ADC rejects 50Hz/60Hz
flicker noise caused by artificial light sources. The IALS pin
provides an analog output current proportional to the
measured light (420μA FSR).
For proximity sensor (Prox) data conversions, the built-in driver
turns on an external infrared LED and the proximity sensor
ADC converts the reflected IR intensity to digital. This ADC
rejects ambient IR noise (such as sunlight) and has a 540μs
conversion time.
The ISL29030 provides low power operation of ALS and proximity
sensing with a typical 138μA normal operation current (110μA for
sensors and internal circuitry, ~28μA for external LED) with
220mA current pulses for a net 100μs, repeating every 800ms
(or under).
The ISL29030 uses both a hardware pin and software bits to
indicate an interrupt event has occurred. An ALS interrupt is
defined as a measurement which is outside a set window. A
proximity interrupt is defined as a measurement over a
threshold limit. The user may also require that both ALS/prox
interrupts occur at once, up to 16 times in a row before
activating the interrupt pin.
The ISL29030 is designed to operate from 2.25V to 3.63V over
the -40°C to +85°C ambient temperature range. It is packaged in
a clear, lead-free 8 lead ODFN package.
Pin Configuration
ISL29030
8 LD ODFN (2.0x2.1x0.7mm)
TOP VIEW
IALS
1
VDD
2
GND
3
REXT
4
THERMAL
PAD
8
IRDR
7
INT
6
SDA
5
SCL
*THERMAL PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
November 12, 2012
FN6872.1
1
• Dual ADCs Measure ALS/Prox Concurrently
• Intelligent Interrupt Scheme Simplifies μC Code
Ambient Light Sensing
• Simple Output Code Directly Proportional to lux
• 50Hz/60Hz Flicker Noise and IR Rejection
• Light Sensor Close to Human Eye Response
• Selectable 125/2000 Lux Range
• Analog 420μA Output Pin IALS Proportional to Lux
Proximity Sensing
• Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
• IR LED Driver with I2C Programmable Sink Currents
- Net 100μs Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time up to 800ms Between Pulses
• Ambient IR Noise Cancellation (Including Sunlight)
Intelligent and Flexible Interrupts
• Independent ALS/Prox Interrupt Thresholds
• Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
Ultra Low Power
• 138μA DC Typical Supply Current for ALS/Prox Sensing
- 110μA for Sensors and Internal Circuitry
- 28μA Typical Current for External IR LED (Assuming
220mA for 100μs Every 800ms)
• <1.0μA Supply Current When Powered Down
Easy to Use
• Set Registers; Wait for Interrupt
• I2C (SMBus Compatible) Output
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I2C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
Applications
• Display and Keypad Dimming Adjustment and Proximity
Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
• Industrial and Medical Light and Proximity Sensing
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Copyright © Intersil Americas Inc. 2010, 2012. All Rights Reserved.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
2
I C Bus is a registered trademark owned by NXP Semiconductors Netherlands, B.V.
All other trademarks mentioned are the property of their respective owners.
ISL29030
Pin Descriptions
PIN NUMBER
PIN NAME
DESCRIPTION
-
T.PAD
1
IALS
Analog Current Output (Proportional to ALS/IR Data Count: 420µA FSR)
2
VDD
Positive supply: 2.25V to 3.63V
3
GND
Ground
4
REXT
External resistor (499kΩ; 1%) connects this pin to ground
5
SCL
I2C clock line
6
SDA
I2C data line
7
INT
Interrupt pin; Logic output (open-drain) for interrupt
8
IRDR
Thermal Pad (connect to GND or float)
The I2C bus lines can be pulled from 1.7V to above VDD, 3.63V max
IR LED driver pin - current flows into ISL29030 from LED cathode
Block Diagram
VDD
2
ALS PHOTODIODE
ARRAY
COMMAND
REGISTER
LIGHT DATA
PROCESS
ALS AND IR
DUAL CHANNEL
ADCs
DATA
REGISTER
DAC
5
SCL
6
SDA
INTERRUPT
7
INT
IR DRIVER
8
IRDR
I2C
IR PHOTODIODE
ARRAY
1 IALS
IREF
FOSC
4
3
REXT
GND
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
TEMP. RANGE
(°C)
ISL29030IROZ-T7
-40 to +85
ISL29030IROZ-EVALZ
PACKAGE
TAPE AND REEL
(Pb-free)
8 Ld ODFN
PKG.
DWG. #
L8.2.1x2.0
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 ISL29030. For more information on MSL please see techbrief TB477.
2
FN6872.1
November 12, 2012
ISL29030
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
VDD Supply Voltage between VDD and GND . . . . . . . . . . . . . . . . . . . . . .4.0V
I2C Bus Pin Voltage (SCL, SDA). . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 4.0V
I2C Bus Pin Current (SCL, SDA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
REXT Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5V to VDD + 0.5V
IRDR Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5V
IALS Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5V to VDD + 0.5V
INT Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 4.0V
INT Pin Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
ESD Rating
Human Body Model (Note 5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
Thermal Resistance (Typical, Note 4)
θJA (°C/W)
8 Ld ODFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
88
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +90°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +100°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Pb-Free Reflow Profile (*) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB477
*Peak temperature during solder reflow +235°C max
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.
NOTES:
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. ESD on all pins is 2kV except for IRDR, which is 1.5kV.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise
noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications
PARAMETER
VDD
VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance.
DESCRIPTION
CONDITION
Power Supply Range
MIN
MAX
(Note 10) TYP (Note 10) UNIT
2.25
3.0
3.63
V
SR_VDD
Input Power-up Slew Rate
VDD Rising Edge between 0.4V and 2.25V
IDD_OFF
Supply Current when Powered Down
ALS_EN = 0; PROX_EN = 0
0.1
0.8
µA
Supply Current for ALS+Prox in Sleep Time
ALS_EN = 1; PROX_EN = 1
116
135
µA
ALS_EN = 0; PROX_EN = 1
85
µA
ALS_EN = 1; PROX_EN = 0
102
µA
5.25
MHz
IDD_NORM
IDD_PRX_SLP Supply Current for Prox in Sleep Time
IDD_ALS
fOSC
Supply Current for ALS
Internal Oscillator Frequency
tINTGR_ALS
12-bit ALS Integration/Conversion Time
tINTGR_PROX
8-bit Prox Integration/Conversion Time
IALS_OFF
0.5
88
V/ms
100
112
0.54
IALS Output Current when ALS = Disabled
ALS_EN = 0; VI_ALS = 0V
IALS_0
IALS Output Current When Dark
IALS_1
ms
ms
3
100
nA
ALS_EN = 1; ALS_RANGE = 1; E = 0 Lux
0.1
0.6
µA
Current Output under Specified Conditions
E = 53 lux, Fluorescent (Note 6),
ALS_RANGE = 0
161
IALS_2
Current Output under Specified Conditions
E = 320 lux, Fluorescent (Note 6)
ALS_RANGE = 1
IALS_F
IALS Output Current At Full Scale
ALS_EN = 1; ALS Code = 4095
VI_ALS
Compliance Voltage on IALS w/ 5% Variation in ALS_EN = 1; ALS Code = 4095
Output Current
µA
40
60
80
µA
380
420
460
µA
VDD-0.8
V
3
Counts
4095
Counts
0
DATAALS_0
ALS Result when Dark
EAMBIENT = 0 lux, 2k Range
DATAALS_F
Full Scale ALS ADC Code
EAMBIENT > Selected Range Maximum Lux (Note 9)
Count Output Variation Over Three Light
Sources: Fluorescent, Incandescent and
Sunlight
Ambient Light Sensing
±10
%
Light Count Output with LSB of
0.0326 lux/count
E = 53 lux, Fluorescent (Notes 6, 9),
ALS_RANGE = 0
1638
Counts
ΔDATA
DATA
DATAALS_1
3
1
FN6872.1
November 12, 2012
ISL29030
Electrical Specifications
PARAMETER
DATAALS_2
VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance. (Continued)
DESCRIPTION
CONDITION
Light Count Output With LSB of 0.522 lux/count E = 320 lux, Fluorescent (Note 6)
ALS_RANGE = 1
MIN
MAX
(Note 10) TYP (Note 10) UNIT
460
614
768
Counts
1
2
Counts
255
Counts
57
Counts
DATAPROX_0
Prox Measurement w/o Object in Path
DATAPROX_F
Full Scale Prox ADC Code
DATAPROX_1
Prox Measurement Result
(Note 7)
tr
Rise Time for IRDR Sink Current
RLOAD = 15Ω at IRDR pin, 20% to 80%
500
ns
tf
Fall time for IRDR Sink Current
RLOAD = 15Ω at IRDR pin, 80% to 20%
500
ns
IIRDR_0
IRDR Sink Current
PROX_DR = 0; VIRDR = 0.5V
IIRDR_1
IRDR Sink Current
PROX_DR = 1; VIRDR = 0.5V
IRDR Leakage Current
PROX_EN = 0; VDD = 3.63V (Note 8)
-1
VIRDR
Acceptable Voltage Range on IRDR Pin
Register bit PROX_DR = 0
0.5
tPULSE
Net IIRDR On Time Per PROX Reading
100
µs
VREF
Voltage of REXT Pin
0.51
V
FI2C
VI2C
I2C Clock Rate Range
IIRDR_LEAK
35
Supply Voltage Range for I2C Interface
98
46
110
120
220
mA
mA
0.001
1.7
1
µA
4.3
V
400
kHz
3.63
V
0.55
V
VIL
SCL and SDA Input Low Voltage
VIH
SCL and SDA Input High Voltage
ISDA
SDA Current Sinking Capability
VOL = 0.4V
3
5
mA
IINT
INT Current Sinking Capability
VOL = 0.4V
3
5
mA
(ΔIIRDR)/(ΔVIRDR)
PROX_DR = 0; VIRDR = 0.5V to 4.3V
4
mA/V
PSRRIRDR
1.25
V
NOTES:
6. An LED is used in production test. The LED irradiance is calibrated to produce the same DATA count against a fluorescent light source of the same lux
level.
7. An 850nm infrared LED is used to test PROX/IR sensitivity in an internal test mode.
8. Ability to guarantee IIRDR leakage of ~1nA is limited by test hardware.
9. For ALS applications under light-distorting glass, please see the section titled “ALS Range 1 Considerations” on page 11.
10. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
I2C Electrical Specifications
(Note 11).
PARAMETER
For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance
DESCRIPTION
MAX
UNIT
3.63
V
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
VI2C
Supply Voltage Range for
fSCL
Ii
I2C
Interface
Input Leakage for each SDA, SCL Pin
CONDITION
MIN
1.7
TYP
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
4
FN6872.1
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ISL29030
I2C Electrical Specifications
(Note 11). (Continued)
PARAMETER
For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
10
pF
Ci
Capacitance for each SDA and SCL Pin
tHD:STA
Hold Time (Repeated) START Condition
After this period, the first clock pulse is
generated
600
ns
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
tR
Rise Time of both SDA and SCL Signals
(Note 12)
20 + 0.1xCb
ns
tF
Fall Time of both SDA and SCL Signals
(Note 12)
20 + 0.1xCb
ns
Set-up Time for STOP Condition
600
ns
Bus Free Time Between a STOP and START
Condition
1300
ns
tSU:STO
tBUF
Cb
Capacitive Load for Each Bus Line
400
Maximum is determined by tR and tF
1
pF
Rpull-up
SDA and SCL system bus pull-up resistor
kΩ
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
NOTES:
11. I2C limits are based on design/simulation and are not production tested.
12. Cb is the capacitance of the bus in pF.
5
FN6872.1
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ISL29030
FIGURE 1. I2C TIMING DIAGRAM
Register Map
There are ten 8-bit registers accessible via I2C. Registers 0x1 and 0x2 define the operation mode of the device. Registers 0x3 through 0x7
store the various ALS/IR/Prox thresholds which trigger interrupt events. Registers 0x8 through 0xA store the results of ALS/IR/Prox ADC
conversions.
TABLE 1. ISL29030 REGISTERS AND REGISTER BITS
BIT
ADDR
REG NAME
0x00
(n/a)
7
6
0x01
CONFIGURE
PROX EN
0x02
INTERRUPT
PROX_FLAG
5
4
3
2
1
0
DEFAULT
(Reserved)
PROX_SLP[2:0]
PROX_PRST[1:0]
PROX_DR
(Write 0)
ALS_FLAG
(n/a)
ALS_EN
ALS_RANGE
ALS_PRST[1:0]
ALSIR_MODE
0x00
INT_CTRL
0x00
0x03
PROX_LT
PROX_LT[7:0]
0x00
0x04
PROX_HT
PROX_HT[7:0]
0xFF
0x05
ALSIR_TH1
ALSIR_LT[7:0]
0x00
0x06
ALSIR_TH2
ALSIR_HT[3:0]
ALSIR_LT[11:8]
0xF0
0x07
ALSIR_TH3
ALSIR_HT[11:4]
0xFF
0x08
PROX_DATA
PROX_DATA[7:0]
0x00
0x09
ALSIR_DT1
ALSIR_DATA[7:0]
0x00
0x0A
ALSIR_DT2
0x0E
TEST1
(Write as 0x00)
0x00
0x0F
TEST2
(Write as 0x00)
0x00
(Unused)
6
ALSIR_DATA[11:8]
0x00
FN6872.1
November 12, 2012
ISL29030
Register Descriptions
TABLE 2. REGISTER 0x00 (RESERVED)
BIT #
ACCESS
DEFAULT
NAME
7:0
RO
(n/a)
(n/a)
FUNCTION/OPERATION
Reserved - no need to read or write
TABLE 3. REGISTER 0x01 (CONFIGURE) - PROX/ALS CONFIGURATION
BIT #
ACCESS
DEFAULT
NAME
FUNCTION/OPERATION
7
RW
0x00
PROX_EN
(Prox Enable)
When = 0, proximity sensing is disabled
When = 1, continuous proximity sensing is enabled. Prox data will be ready 0.54ms after this bit is
set high
6:4
RW
0x00
PROX_SLP
(Prox Sleep)
For bits 6:4 = (see the following)
111; sleep time between prox IR LED pulses is 0.0ms (run continuously)
110; sleep time between prox IR LED pulses is 12.5ms
101; sleep time between prox IR LED pulses is 50ms
100; sleep time between prox IR LED pulses is 75ms
011; sleep time between prox IR LED pulses is 100ms
010; sleep time between prox IR LED pulses is 200ms
001; sleep time between prox IR LED pulses is 400ms
000; sleep time between prox IR LED pulses is 800ms
3
RW
0x00
PROX_DR
(Prox Drive)
When = 0, IRDR behaves as a pulsed 110mA current sink
When = 1, IRDR behaves as a pulsed 220mA current sink
2
RW
0x00
ALS_EN
(ALS Enable)
When = 0, ALS/IR sensing is disabled
When = 1, continuous ALS/IR sensing is enabled with new data ready every 100ms
1
RW
0x00
ALS_RANGE
(ALS Range)
When = 0, ALS is in low-lux range
When = 1, ALS is in high-lux range
0
RW
0x00
ALSIR_MODE
(ALSIR Mode)
When = 0, ALS/IR data register contains visible ALS sensing data
When = 1, ALS/IR data register contains IR spectrum sensing data
TABLE 4. REGISTER 0x02 (INTERRUPT) - PROX/ALS INTERRUPT CONTROL
BIT #
7
ACCESS
DEFAULT
BIT NAME
0x00
PROX_FLAG
(Prox Flag)
When = 0, no Prox interrupt event has occurred since power-on or last “clear”
When = 1, a Prox interrupt event occurred. Clearable by writing “0”
For bits 6:5 = (see the following)
00; set PROX_FLAG if 1 conversion result trips the threshold value
01; set PROX_FLAG if 4 conversion results trip the threshold value
10; set PROX_FLAG if 8 conversion results trip the threshold value
11; set PROX_FLAG if 16 conversion results trip the threshold value
FLAG
6:5
RW
0x00
PROX_PRST
(Prox Persist)
4
RW
0x00
Unused
(Write 0)
3
FLAG
0x00
ALS_FLAG
(ALS FLAG)
FUNCTION/OPERATION
Unused register bit - write 0
When = 0, no ALS interrupt event has occurred since power-on or last “clear”
When = 1, an ALS interrupt event occurred. Clearable by writing “0”
For bits 2:1 = (see the following)
00; set ALS_FLAG if 1 conversion is outside the set window
01; set ALS_FLAG if 4 conversions are outside the set window
10; set ALS_FLAG if 8 conversions are outside the set window
11; set ALS_FLAG if 16 conversions are outside the set window
2:1
RW
0x00
ALS_PRST
(ALS Persist)
0
RW
0x00
INT_CTRL
(Interrupt Control)
When = 0, set INT pin low if PROX_FLAG or ALS_FLAG high (logical OR)
When = 1, set INT pin low if PROX_FLAG and ALS_FLAG high (logical AND)
TABLE 5. REGISTER 0x03 (PROX_LT) - INTERRUPT LOW THRESHOLD FOR PROXIMITY SENSOR
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RW
0x00
PROX_LT
(Prox Threshold)
7
FUNCTION/OPERATION
8-bit interrupt low threshold for proximity sensing
FN6872.1
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ISL29030
TABLE 6. REGISTER 0x04 (PROX_HT) - INTERRUPT HIGH THRESHOLD FOR PROXIMITY SENSOR
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RW
0xFF
PROX_HT
(Prox Threshold)
FUNCTION/OPERATION
8-bit interrupt high threshold for proximity sensing
TABLE 7. REGISTER 0x05 (ALSIR_TH1) - INTERRUPT LOW THRESHOLD FOR ALS/IR
BIT #
ACCESS
DEFAULT
BIT NAME
ALSIR_LT[7:0]
(ALS/IR Low Thr.)
FUNCTION/OPERATION
Lower 8 bits (of 12 bits) for ALS/IR low interrupt threshold
7:0
RW
0x00
BIT #
ACCESS
DEFAULT
BIT NAME
7:4
RW
0x0F
ALSIR_HT[3:0]
(ALS/IR High Thr.)
Lower 4 bits (of 12 bits) for ALS/IR high interrupt threshold
3:0
RW
0x00
ALSIR_LT[11:8]
(ALS/IR Low Thr.)
Upper 4 bits (of 12 bits) for ALS/IR low interrupt threshold
TABLE 8. REGISTER 0x06 (ALSIR_TH2) - INTERRUPT LOW/HIGH THRESHOLDS FOR ALS/IR
FUNCTION/OPERATION
TABLE 9. REGISTER 0x07 (ALSIR_TH3) - INTERRUPT HIGH THRESHOLD FOR ALS/IR
BIT #
7:0
ACCESS
RW
DEFAULT
BIT NAME
0xFF
ALSIR_HT[11:4]
(ALS/IR High Thr.)
FUNCTION/OPERATION
Upper 8 bits (of 12 bits) for ALS/IR high interrupt threshold
TABLE 10. REGISTER 0x08 (PROX_DATA) - PROXIMITY SENSOR DATA
BIT #
7:0
ACCESS
RO
DEFAULT
BIT NAME
0x00
PROX_DATA
(Proximity Data)
FUNCTION/OPERATION
Results of 8-bit proximity sensor ADC conversion
TABLE 11. REGISTER 0x09 (ALSIR_DT1) - ALS/IR SENSOR DATA (LOWER 8 BITS)
BIT #
7:0
ACCESS
RO
DEFAULT
BIT NAME
0x00
ALSIR_DATA
(ALS/IR Data)
FUNCTION/OPERATION
Lower 8 bits (of 12 bits) from result of ALS/IR sensor conversion
TABLE 12. REGISTER 0x0A (ALSIR_DT2) - ALS/IR SENSOR DATA (UPPER 4 BITS)
BIT #
ACCESS
DEFAULT
BIT NAME
7:4
RO
0x00
(Unused)
3:0
RO
0x00
ALSIR_DATA
(ALS/IR Data)
FUNCTION/OPERATION
Unused bits.
Upper 4 bits (of 12 bits) from result of ALS/IR sensor conversion
TABLE 13. REGISTER 0x0E (TEST1) - TEST MODE
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RW
0x00
(Write as 0x00)
FUNCTION/OPERATION
Test mode register. When 0x00, in normal operation.
TABLE 14. REGISTER 0x0F (TEST2) - TEST MODE 2
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RW
0x00
(Write as 0x00)
8
FUNCTION/OPERATION
Test mode register. When 0x00, in normal operation.
FN6872.1
November 12, 2012
ISL29030
I2C DATA
DEVICE ADDRESS
START
I2C SDA
MASTER
REGISTER ADDRESS
W A
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
I2C SDA
SLAVE (ISL29030)
SDA DRIVEN BY MASTER
I2C CLK
1
2
3
4
5
6
7
SDA DRIVEN BY MASTER
A
8
9
1
2
3
4
5
6
DEVICE ADDRESS
STOP START
7
A
8
9
A6 A5 A4 A3 A2 A1 A0 W
SDA DRIVEN BY MASTER
1
2
3
4
5
6
DATA BYTE0
A
SDA DRIVEN BY ISL29030
A
A D7 D6 D5 D4 D3 D2 D1 D0
7
8
9
1
2
3
4
5
6
7
8
9
FIGURE 2. I2C DRIVER TIMING DIAGRAM FOR MASTER AND SLAVE CONNECTED TO COMMON BUS
Principles of Operation
Photodiodes and ADCs
I2C Interface
The ISL29030 contains two photodiode arrays which convert
photons (light) into current. The ALS photodiodes are constructed to
mimic the human eye’s wavelength response curve to visible light
(see Figure 7). The ALS photodiodes’ current output is digitized by a
12-bit ADC in 100ms. These 12 bits can be accessed by reading
from I2C registers 0x9 and 0xA when the ADC conversion is
completed.
The ISL29030’s I2C interface slave address is internally hardwired
as 0b1000100.
Figure 2 shows a sample one-byte read. 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
with the master asserting a start condition (SDA falling while SCL
remains high). The first transmitted byte is initiated by the
master and includes 7 address bits and a R/W bit. The slave is
responsible for pulling SDA low during the ACK bit after every
transmitted byte.
Each I2C transaction ends with the master asserting a stop
condition (SDA rising while SCL remains high).
For more information about the I2C standard, please consult the
Philips™ I2C specification documents.
9
The ALS converter is a charge-balancing integrating 12-bit ADC.
Charge-balancing is best for converting small current signals in the
presence of periodic AC noise. Integrating over 100ms highly rejects
both 50Hz and 60Hz light flicker by picking the lowest integer
number of cycles for both 50Hz/60Hz frequencies.
FN6872.1
November 12, 2012
ISL29030
ALS CONVERSION
TIME = 100ms
(FIXED)
SEVERAL µs BETWEEN
CONVERSIONS
ALS
ACTIVE
100ms
PROX
SENSOR
ACTIVE
100ms
100ms
100ms
100ms
TIME
0.54ms FOR
PROX
CONVERSION
TIME
IRDR
(CURRENT
DRIVER)
SERIES OF
CURRENT PULSES
TOTALING 0.1ms
TIME
SLEEP TIME
(PROX_SLP)
FIGURE 3. TIMING DIAGRAM FOR PROX/ALS EVENTS - NOT TO SCALE
The proximity sensor is an 8-bit ADC which operates in a similar
fashion. When proximity sensing is enabled, the IRDR pin will
drive a user-supplied infrared LED, the emitted IR reflects off an
object (i.e., a human head) back into the ISL29030, and a sensor
converts the reflected IR wave to a current signal in 0.54ms. The
ADC subtracts the IR reading before and after the LED is driven
(to remove ambient IR such as sunlight), and converts this value
to a digital count stored in Register 0x8.
The ISL29030 is designed to run two conversions concurrently: a
proximity conversion and an ALS (or IR) conversion. Please note that
because of the conversion times, the user must let the ADCs perform
one full conversion first before reading from I2C Registers
PROX_DATA (wait 0.54ms) or ALSIR_DT1/2 (wait 100ms). The timing
between ALS and Prox conversions is arbitrary (as shown in Figure 3).
The ALS runs continuously with new data available every 100ms. The
proximity sensor runs continuously with a time between conversions
decided by PROX_SLP (Register 1 Bits [6:4]).
Ambient Light and IR Sensing
The ISL29030 is set for ambient light sensing when Register bit
ALSIR_MODE = 0 and ALR_EN = 1. The light-wavelength response of
the ALS appears as shown in Figure 6. ALS measuring mode (as
opposed to IR measuring mode) is set by default.
When the part is programmed for infrared (IR) sensing
(ALSIR_MODE = 1; ALS_EN = 1), infrared light is converted into a
current and digitized by the same ALS ADC. The result of an IR
conversion is strongly related to the amount of IR energy incident
on our sensor, but is unitless and is referred to in digital counts.
Proximity Sensing
When proximity sensing is enabled (PROX_EN = 1), the external
IR LED is driven for 0.1ms by the built-in IR LED driver through
the IRDR pin. The amplitude of the IR LED current depends on
Register 1 bit 3: PROX_DR. If this bit is low, the load will see a
fixed 110mA current pulse. If this bit is high, the load on IRDR
10
will see a fixed 220mA current pulse as seen in Figure 4.
220mA
(PROX_DR = 1)
110mA
(PROX_DR = 0)
PIN 8 - IRDR
(IRDR IS HI-Z WHEN
NOT DRIVING)
FIGURE 4. CURRENT DRIVE MODE OPTIONS
When the IR from the LED reaches an object and gets reflected
back into the ISL29030, the reflected IR light is converted into
current as per the IR spectral response shown in Figure 7. One
entire proximity measurement takes 0.54ms for one conversion
(which includes 0.1ms spent driving the LED), and the period
between proximity measurements is decided by PROX_SLP
(sleep time) in Register 1 Bits 6:4.
Average LED driving current consumption is given by Equation 1.
I lRDR ;PEAK × 100μs
I lRDR ;AVE = ----------------------------------------------------T SLEEP
(EQ. 1)
A typical IRDR scheme is 220mA amplitude pulses every 800ms,
which yields 28μA DC.
Total Current Consumption
Total current consumption is the sum of IDD and IIRDR. The IRDR
pin sinks current (as shown in Figure 4) and the average IRDR
current can be calculated using Equation 1. IDD depends on
voltage and the mode-of-operation as seen in Figure 11.
Interrupt Function
The ISL29030 has an intelligent interrupt scheme designed to
shift some logic processing away from intensive microcontroller
I2C polling routines (which consume power) and towards a more
FN6872.1
November 12, 2012
ISL29030
independent light sensor which can instruct a system to “wake
up” or “go to sleep.”
An ALS interrupt event (ALS_FLAG) is governed by Registers 5 through
7. The user writes a high and low threshold value to these registers
and the ISL29030 will issue an ALS interrupt flag if the actual count
stored in Registers 0x9 and 0xA are outside the user’s programmed
window. The user must write 0 to clear the ALS_FLAG.
A proximity interrupt event (PROX_FLAG) is governed by the high
and low thresholds in registers 3 and 4 (PROX_LT and PROX_HT).
PROX_FLAG is set when the measured proximity data is more
than the higher threshold X-times-in-a-row (X is set by user; see
following paragraph). The proximity interrupt flag is cleared when
the prox data is lower than the low proximity threshold
X-times-in-a-row, or when the user writes “0” to PROX_FLAG.
Interrupt persistency is another useful option available for both
ALS and proximity measurements. Persistency requires X-in-arow interrupt flags before the INT pin is driven low. Both ALS and
Prox have their own independent interrupt persistency options.
See ALS_PRST and PROX_PRST bits in Register 2.
The final interrupt option is the ability to AND or OR the two
interrupt flags using Register 2 Bit 0 (INT_CTRL). If the user
wants both ALS/Prox interrupts to happen at the same time
before changing the state of the interrupt pin, set this bit high. If
the user wants the interrupt pin to change state when either the
ALS or the Proximity interrupt flag goes high, leave this bit to its
default of 0.
Analog-Out IALS Pin
When ALS_EN = 1, The analog IALS output pin sources a current
directly proportional to the digital count stored in register bits
ALSIRDATA[11:0]. When ALS_EN = 0, this pin is in a high
impedance state. See Figure 15 for the effects of the compliance
voltage VI_ALS on IALS.
ALS Range 1 Considerations
When measuring ALS counts higher than 1800 on range 1
(ALSIR_MODE = 0, ALS_RANGE = 0, ALS_DATA > 1800), switch
to range 2 (change the ALS_RANGE bit from “0” to “1”) and
remeasure ALS counts. This recommendation pertains only to
applications where the light incident upon the sensor is IR-heavy
and is distorted by tinted glass that increases the ratio of infrared
to visible light. For more information, see the separate ALS
Range 1 Considerations document.
VDD Power-up and Power Supply
Considerations
Upon power-up, please ensure a VDD slew rate of 0.5V/ms or greater.
After power-up, or if the user’s power supply temporarily deviates
from our specification (2.25V to 3.63V), Intersil recommends the
user write the following: write 0x00 to register 0x01, write 0x29 to
register 0x0F, write 0x00 to register 0x0E, and write 0x00 to register
0x0F. The user should then wait ~1ms or more and then rewrite all
registers to the desired values. If the user prefers a hardware reset
method instead of writing to test registers: set VDD = 0V for 1 second
or more, power back up at the required slew rate, and write registers
to the desired values.
11
Power-Down
The power-down can be set 2 ways by the user. The first is to set both
PROX_EN and ALS_EN bits to 0 in Register 1. The second and more
simple way is to set all bits in Register 1 to 0 (0x00).
Calculating Lux
The ISL29030’s ADC output codes are directly proportional to lux
when in ALS mode (see ALSIR_MODE bit).
E calc = α RANGE × OUT ADC
(EQ. 2)
In Equation 2, Ecalc is the calculated lux reading and OUT
represents the ADC code. The constant α to plug in is determined
by the range bit ALS_RANGE (register 0x1 bit 1) and is
independent of the light source type.
TABLE 15. ALS SENSITIVITY AT DIFFERENT RANGES
ALS_RANGE
αRANGE
(Lux/Count)
0
0.0326
1
0.522
Table 15 shows two different scale factors: one for the low range
(ALS_RANGE = 0) and the other for the high range (ALS_RANGE
= 1).
Noise Rejection
Charge balancing ADC’s have excellent noise-rejection
characteristics for periodic noise sources whose frequency is an
integer multiple of the conversion rate. 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. Since wall sockets
may output at 60Hz or 50Hz, our integration time is 100ms: the
lowest common integer number of cycles for both frequencies.
Proximity Detection of Various Objects
Proximity sensing relies on the amount of IR reflected back from
objects. A perfectly black object would absorb all light and reflect
no photons. The ISL29030 is sensitive enough to detect black ESD
foam which reflects only 1% of IR. For biological objects, blonde
hair reflects more than brown hair and customers may notice that
skin tissue is much more reflective than hair. IR penetrates into
the skin and is reflected or scattered back from within. As a result,
the proximity count peaks at contact and monotonically decreases
as skin moves away. The reflective characteristics of skin are very
different from that of paper.
Typical Circuit
A typical application for the ISL29030 is shown in Figure 5. The
ISL29030’s I2C address is internally hardwired as 0b1000100.
The device can be tied onto a system’s I2C bus together with
other I2C compliant devices.
FN6872.1
November 12, 2012
ISL29030
Soldering Considerations
Layout Considerations
Convection heating is recommended for reflow soldering; directinfrared 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.
(http://www.intersil.com/data/tb/TB477.pdf)
The ISL29030 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.
Suggested PCB Footprint
Route the supply and I2C traces as far as possible from all sources of
noise. A 0.1µF and 1µF power supply decoupling capacitors need to be
placed close to the device.
It is important that users check the “Surface Mount Assembly
Guidelines for Optical Dual FlatPack No Lead (ODFN) Package”
before starting ODFN product board mounting.
(http://www.intersil.com/data/tb/TB477.pdf)
VI2C_PULL-UP
R1
10kΩ
R2
10kΩ
I2C MASTER
R3
10kΩ
MICROCONTROLLER
INT
SDA
SCL
VDD
VIR-LED
V
SLAVE_0
1
3.5kΩ
2
C1
1µF
C2
0.1µF
3
4
IALS
IRDR
VDD
INT
GND
SDA
REXT
SCL
REXT
499kΩ
SLAVE_1
8
7
I2C SLAVE_n
SDA
SDA
SCL
SCL
6
5
ISL29030
FIGURE 5. ISL29030 TYPICAL CIRCUIT
12
FN6872.1
November 12, 2012
ISL29030
Typical Performance Curves
VDD = 3.0V, REXT = 499kΩ
1.0
1.0
0.8
0.7
0.6
HALOGEN
0.5
INCAND.
SUN
0.4
HUMAN EYE
0.9
FLUORESCENT
NORMALIZED RESPONSE
NORMALIZED INTENSITY
0.9
0.3
0.2
IR/PROX
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 6. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED
BY LUMINOUS INTENSITY (LUX)
800
900
1000
1100
FIGURE 7. ISL29030 SENSITIVITY TO DIFFERENT WAVELENGTHS
2500
1.0
HALOGEN
LUX METER READING (LX)
0.9
NORMALIZED SENSITIVITY
700
WAVELENGTH (nm)
WAVELENGTH (nm)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
2000
1500
FLUORESCENT
1000
INCANDESCENT
500
0.1
0
-90
-60
-30
0
30
60
0
90
0
1000
ANGULAR OFFSET (°)
FIGURE 8. ANGULAR SENSITIVITY
5000
ALS+PROX (DURING PROX SLEEP)
18% GREY CARD
140
MEASURED IDD (µA)
PROX COUNTS (8-BIT)
4000
160
250
220mA MODE
200
110mA MODE
150
100
WHITE COPY PAPER
50
ALS-ONLY
120
100
80
PROX (DURING PROX SLEEP)
60
0
3000
FIGURE 9. ALS LINEARITY OVER 3 LIGHT SOURCES (2000 LUX
RANGE)
300
0
2000
ALS CODE (12-BIT)
20
40
60
80 100 120 140
DISTANCE (mm)
160
180
200
FIGURE 10. PROX COUNTS vs DISTANCE WITH 10CM x 10CM
REFLECTOR (USING ISL29030 EVALUATION BOARD)
13
40
2.25 2.40
2.55
2.70
2.85 3.00 3.15
INPUT VDD (V)
3.30
3.45 3.60
FIGURE 11. VDD vs IDD FOR VARIOUS MODES OF OPERATION (IALS
PIN FLOATING)
FN6872.1
November 12, 2012
ISL29030
Typical Performance Curves
VDD = 3.0V, REXT = 499kΩ (Continued)
50
240
30
ALS COUNT CHANGE
FROM +25°C (%)
IIRDR (mA)
40
220mA-MODE (PROX_DR = 1)
220
200
180
160
140
120
100
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
-10
-20
-30
-40
110mA-MODE (PROX_DR = 0)
0
20
10
-50
5.0
-40
-20
VIRDR (V)
FIGURE 12. IRDR PULSE AMPLITUDE vs VIRDR
0
20
40
TEMPERATURE (°C)
60
80
FIGURE 13. STABILITY OF ALS COUNT OVER-TEMPERATURE
(AT 300 LUX)
10
100
9
80
7
IALS (%)
6
IALS (%)
ALS CODE (12-BIT)
8
5
4
60
40
3
2
20
1
0
-40
10
TEMPERATURE (°C)
FIGURE 14. STABILITY OF ALS COUNT
OVER-TEMPERATURE (AT 0.00 LUX)
14
60
0
0
0.5
1.0
1.5
2.0
2.5
3.0
VI_ALS (V)
FIGURE 15. COMPLIANCE VOLTAGE V I_ALS'S EFFECTS ON IALS
(REFERENCED TO VI_ALS = 0V)
FN6872.1
November 12, 2012
ISL29030
2.00
SENSOR OFFSET
2.10
0.43
1
8
2
7
3
6
0.50
4
5
0.42
FIGURE 16. 8 LD ODFN SENSOR LOCATION OUTLINE - DIMENSIONS IN mm
15
FN6872.1
November 12, 2012
ISL29030
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
4/19/11
FN6872.1
Corrected Tech Brief reference in Note 3 of “Ordering Information” on page 2 from TB363 to TB477.
Added Note 10 to MIN MAX columns of “Electrical Specifications” on page 3.
Updated “Package Outline Drawing” on page 17 as follows:
-In the “bottom view” image, added a dimension from the edge of the package to the edge of the first lead,
which is 0.15mm. Also added a dimension from the edge of the package (top edge in the picture) to the center
of the lead, which is 0.25mm
-Changed the drawing in the bottom view to show the new look of the pin#1 indicator
-Corrected note 4 from "Dimension b applies.." to "Dimension applies..."
-Added note 4 callout to bottom view
-Enclosed Note #'s 4, 5, 6 in triangles
10/18/10
6/15/10
Updates to test methodology, addition of "ALS Range 1 Considerations" paragraph, updates to "Power-Up"
Sequence, test register clarification, I_als FSR typo fixes
FN6872.0
Initial release.
About Intersil
Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management
semiconductors. The company's products address some of the fastest growing markets within the industrial and infrastructure,
personal computing and high-end consumer markets. For more information about Intersil or to find out how to become a member of
our winning team, visit our website and career page at www.intersil.com.
For a complete listing of Applications, Related Documentation and Related Parts, please see the respective product information page.
Also, please check the product information page to ensure that you have the most updated datasheet: ISL29030
To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff
Reliability reports are available from our website at: http://rel.intersil.com/reports/search.php
For additional products, see www.intersil.com/product_tree
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
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
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
16
FN6872.1
November 12, 2012
ISL29030
Package Outline Drawing
L8.2.1x2.0
8 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN)
Rev 3, 1/11
2.10
A
6
PIN 1
INDEX AREA
0.15
B
0.25
6
PIN 1
INDEX AREA
0.50
1.50
2.00
1.50
0.20±0.05 4
(2X)
0.10 M C A B
0.10
8X 0 . 35 ± 0 . 05
TOP VIEW
0.75
BOTTOM VIEW
SEE DETAIL "X"
2.50
0.10 C
2.10
0.70±0.05
C
BASE PLANE
SEATING PLANE
0.08 C
SIDE VIEW
(6x0.50)
(1.50)
(8x0.20)
C
(8x0.20)
5
0 . 00 MIN.
0 . 05 MAX.
(8x0.55)
DETAIL "X"
(0.75)
TYPICAL RECOMMENDED LAND PATTERN
0 . 2 REF
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 0.25mm and 0.35mm from the terminal tip.
5.
Tiebar shown (if present) is a non-functional feature.
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 indentifier may be
either a mold or mark feature.
17
FN6872.1
November 12, 2012
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