Intersil ISL29030A Low power ambient light and proximity sensor with intelligent interrupt Datasheet

ISL29030A
Features
The ISL29030A 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.
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 ISL29030A 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 ISL29030A 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 ISL29030A 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
ISL29030A
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 18, 2010
FN7722.0
1
• Works Under All Light Sources Including Sunlight
• 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.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2010. 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.
ISL29030A
Low Power Ambient Light and Proximity Sensor with Intelligent
Interrupt and Sleep Modes - Analog and Digital Out
ISL29030A
Pin Descriptions
PIN NUMBER
PIN NAME
DESCRIPTION
0
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 ISL29030A from LED cathode
Block Diagram
VDD
2
ALS PHOTODIODE
ARRAY
COMMAND
REGISTER
LIGHT DATA
PROCESS
ALS AND IR
DUAL CHANNEL
ADCs
DATA
REGISTER
DAC
I2C
IR PHOTODIODE
ARRAY
1 I
ALS
5 SCL
6 SDA
IREF
FOSC
4
3
REXT
GND
INTERRUPT
7
IR DRIVER
8 IRDR
INT
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
TEMP. RANGE
(°C)
ISL29030AIROZ-T7
-40 to +85
ISL29030AIROZ-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 ISL29030A. For more information on MSL please
see techbrief TB363.
2
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ISL29030A
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 link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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
TYP
MAX
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
IDD_NORM
IDD_PRX_SLP Supply Current for Prox in Sleep Time
IDD_ALS
fOSC
Supply Current for ALS
0.5
ALS_EN = 0; PROX_EN = 1
85
µA
ALS_EN = 1; PROX_EN = 0
102
µA
5.25
MHz
Internal Oscillator Frequency
tINTGR_ALS 12-bit ALS Integration/Conversion Time
88
tINTGR_PROX 8-bit Prox Integration/Conversion Time
IALS_OFF
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
ALS_EN = 1; ALS_RANGE = 1; E = 0 Lux
IALS_1
Current Output under Specified Conditions E = 53 lux, Fluorescent (Note 6),
ALS_RANGE = 0
IALS_2
Current Output under Specified Conditions E = 320 lux, Fluorescent (Note 6)
ALS_RANGE = 1
IALS_F
IALS Output Current At Full Scale
VI_ALS
Compliance Voltage on IALS w/ 5%
Variation in Output Current
ms
ms
3
100
nA
0.1
0.6
µA
161
µA
40
60
80
µA
ALS_EN = 1; ALS Code = 4095
380
420
460
µA
ALS_EN = 1; ALS Code = 4095
0
VDD0.8
V
3
Counts
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)
1
4095 Counts
Ambient Light Sensing
±10
%
DATAALS_1 Light Count Output with LSB of
0.0326 lux/count
E = 53 lux, Fluorescent (Notes 6, 9),
ALS_RANGE = 0
1638
Counts
DATAALS_2 Light Count Output With LSB of
0.522 lux/count
E = 320 lux, Fluorescent (Note 6)
ALS_RANGE = 1
ΔDATA
DATA
Count Output Variation Over Three Light
Sources: Fluorescent, Incandescent and
Sunlight
3
460
614
768
Counts
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ISL29030A
Electrical Specifications
PARAMETER
VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance. (Continued)
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
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)
35
46
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
IIRDR_LEAK IRDR Leakage Current
98
110
120
220
PROX_EN = 0; VDD = 3.63V (Note 8)
-1
Register bit PROX_DR = 0
0.5
0.001
mA
mA
1
µA
4.3
V
VIRDR
Acceptable Voltage Range on IRDR Pin
tPULSE
Net IIRDR On Time Per PROX Reading
100
µs
VREF
Voltage of REXT Pin
0.51
V
FI2C
VI2C
I2C Clock Rate Range
Supply Voltage Range for I2C Interface
VIL
SCL and SDA Input Low Voltage
VIH
SCL and SDA Input High Voltage
1.7
400
kHz
3.63
V
0.55
V
1.25
V
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
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.
I2C Electrical Specifications For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1%
tolerance (Note 10).
PARAMETER
DESCRIPTION
VI2C
Supply Voltage Range for I2C Interface
fSCL
CONDITION
MIN
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
Ii
1.7
TYP MAX UNIT
Input Leakage for each SDA, SCL Pin
tSP
Pulse Width of Spikes that must be
Suppressed by the Input Filter
tAA
SCL Falling Edge to SDA Output Data Valid
Ci
Capacitance for each SDA and SCL Pin
tHD:STA
Hold Time (Repeated) START Condition
4
1.25
V
0.05VDD
V
-10
After this period, the first clock pulse
is generated
600
0.4
V
10
µA
50
ns
900
ns
10
pF
ns
FN7722.0
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ISL29030A
I2C Electrical Specifications For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1%
tolerance (Note 10). (Continued)
PARAMETER
DESCRIPTION
tLOW
LOW Period of the SCL Clock
tHIGH
CONDITION
Measured at the 30% of VDD
crossing
MIN
TYP MAX UNIT
1300
ns
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 11)
20 + 0.1xCb
ns
tF
Fall Time of both SDA and SCL Signals
(Note 11)
20 + 0.1xCb
ns
600
ns
1300
ns
tSU:STO
tBUF
Cb
Set-up Time for STOP Condition
Bus Free Time Between a STOP and START
Condition
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:
10. I2C limits are based on design/simulation and are not production tested.
11. Cb is the capacitance of the bus in pF.
FIGURE 1. I2C TIMING DIAGRAM
5
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ISL29030A
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. ISL29030A REGISTERS AND REGISTER BITS
BIT
ADDR REG NAME
7
6
0x00
(n/a)
0x01
CONFIGURE
PROX EN
0x02
INTERRUPT
PROX_FLAG
0x03
PROX_LT
5
4
3
2
1
PROX_DR
ALS_EN
0
DEFAULT
(Reserved)
PROX_SLP[2:0]
PROX_PRST[1:0]
(Write 0)
ALS_FLAG
(n/a)
ALS_RANGE ALSIR_MODE
ALS_PRST[1:0]
INT_CTRL
PROX_LT[7:0]
0x00
0x00
0x00
0x04
PROX_HT
PROX_HT[7:0]
0xFF
0x05
ALSIR_TH1
ALSIR_LT[7:0]
0x00
0x06
ALSIR_TH2
0x07
ALSIR_TH3
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
ALSIR_HT[3:0]
ALSIR_LT[11:8]
0xF0
ALSIR_HT[11:4]
(Unused)
0xFF
ALSIR_DATA[11:8]
0x00
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
7
RW
NAME
FUNCTION/OPERATION
0x00
When = 0, proximity sensing is disabled
PROX_EN
When = 1, continuous proximity sensing is enabled. Prox data will be ready 0.54ms
(Prox Enable)
after this bit is set high
6:4
RW
0x00
For bits 6:4 = (see the following)
111; sleep time between prox IR LED
110; sleep time between prox IR LED
101; sleep time between prox IR LED
PROX_SLP
100; sleep time between prox IR LED
(Prox Sleep)
011; sleep time between prox IR LED
010; sleep time between prox IR LED
001; sleep time between prox IR LED
000; sleep time between prox IR LED
3
RW
0x00
PROX_DR
When = 0, IRDR behaves as a pulsed 110mA current sink
(Prox Drive) When = 1, IRDR behaves as a pulsed 220mA current sink
2
RW
0x00
ALS_EN
When = 0, ALS/IR sensing is disabled
(ALS Enable) When = 1, continuous ALS/IR sensing is enabled with new data ready every 100ms
1
RW
0x00
ALS_RANGE When = 0, ALS is in low-lux range
(ALS Range) When = 1, ALS is in high-lux range
0
RW
0x00
pulses
pulses
pulses
pulses
pulses
pulses
pulses
pulses
is
is
is
is
is
is
is
is
0.0ms (run continuously)
12.5ms
50ms
75ms
100ms
200ms
400ms
800ms
ALSIR_MODE When = 0, ALS/IR data register contains visible ALS sensing data
(ALSIR Mode) When = 1, ALS/IR data register contains IR spectrum sensing data
6
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TABLE 4. REGISTER 0x02 (INTERRUPT) - PROX/ALS INTERRUPT CONTROL
BIT # ACCESS DEFAULT
7
FLAG
0x00
BIT NAME
FUNCTION/OPERATION
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”
6:5
RW
0x00
PROX_PRST
(Prox Persist)
4
RW
0x00
Unused
(Write 0)
3
FLAG
0x00
ALS_FLAG
(ALS FLAG)
2:1
RW
0x00
0
RW
0x00
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
Unused register bit - write 0
ALS_PRST
(ALS Persist)
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
INT_CTRL
When = 0, set INT pin low if PROX_FLAG or ALS_FLAG high (logical OR)
(Interrupt Control) 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 #
7:0
ACCESS
RW
DEFAULT
BIT NAME
0x00
PROX_LT
(Prox Threshold)
FUNCTION/OPERATION
8-bit interrupt low threshold for proximity sensing
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
7:0
RW
0x00
ALSIR_LT[7:0]
(ALS/IR Low Thr.)
FUNCTION/OPERATION
Lower 8 bits (of 12 bits) for ALS/IR low interrupt threshold
TABLE 8. REGISTER 0x06 (ALSIR_TH2) - INTERRUPT LOW/HIGH THRESHOLDS FOR ALS/IR
BIT #
ACCESS
DEFAULT
BIT NAME
Lower 4 bits (of 12 bits) for ALS/IR high interrupt threshold
Upper 4 bits (of 12 bits) for ALS/IR low interrupt threshold
7:4
RW
0x0F
ALSIR_HT[3:0]
(ALS/IR High Thr.)
3:0
RW
0x00
ALSIR_LT[11:8]
(ALS/IR Low Thr.)
FUNCTION/OPERATION
TABLE 9. REGISTER 0x07 (ALSIR_TH3) - INTERRUPT HIGH THRESHOLD FOR ALS/IR
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RW
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 #
ACCESS
DEFAULT
BIT NAME
7:0
RO
0x00
PROX_DATA
(Proximity Data)
7
FUNCTION/OPERATION
Results of 8-bit proximity sensor ADC conversion
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November 18, 2010
ISL29030A
TABLE 11. REGISTER 0x09 (ALSIR_DT1) - ALS/IR SENSOR DATA (LOWER 8 BITS)
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RO
0x00
ALSIR_DATA
(ALS/IR Data)
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
FUNCTION/OPERATION
7:4
RO
0x00
(Unused)
3:0
RO
0x00
ALSIR_DATA
(ALS/IR Data)
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
FUNCTION/OPERATION
7:0
RW
0x00
(Write as 0x00)
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RW
0x00
(Write as 0x00)
Test mode register. When 0x00, in normal operation.
TABLE 14. REGISTER 0x0F (TEST2) - TEST MODE 2
I2C DATA
DEVICE ADDRESS
START
I2C SDA
MASTER
FUNCTION/OPERATION
Test mode register. When 0x00, in normal operation.
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 (ISL29030A)
SDA DRIVEN BY MASTER
I2C CLK
1
2
3
4
5
6
7
A
8
9
A
SDA DRIVEN BY MASTER
1
2
3
4
5
6
DEVICE ADDRESS
STOP START
7
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 ISL29030A
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
I2C Interface
The ISL29030A’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.
8
Photodiodes and ADCs
The ISL29030A 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 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.
FN7722.0
November 18, 2010
ISL29030A
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 ISL29030A, 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 ISL29030A 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 ISL29030A 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
9
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 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 ISL29030A, 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-ofoperation as seen in Figure 11.
FN7722.0
November 18, 2010
ISL29030A
Interrupt Function
The ISL29030A 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 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 ISL29030A 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-a-row 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
10
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.
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 ISL29030A’s ADC output codes are directly
proportional to lux when in ALS mode (see ALSIR_MODE
bit).
(EQ. 2)
E calc = α RANGE × OUT ADC
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 ISL29030A
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
FN7722.0
November 18, 2010
ISL29030A
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 ISL29030A is shown in
Figure 5. The ISL29030A’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.
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.
(http://www.intersil.com/data/tb/TB477.pdf)
Suggested PCB Footprint
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)
Layout Considerations
The ISL29030A 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. A 0.1µF and 1µF power supply decoupling
capacitors need to be placed close to the device.
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
SLAVE_1
8
7
I2C SLAVE_n
SDA
SDA
SCL
SCL
6
5
SCL
REXT ISL29030A
499kΩ
FIGURE 5. ISL29030A TYPICAL CIRCUIT
11
FN7722.0
November 18, 2010
ISL29030A
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. ISL29030A 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 ISL29030A
EVALUATION BOARD)
12
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)
FN7722.0
November 18, 2010
ISL29030A
Typical Performance Curves
VDD = 3.0V, REXT = 499kΩ (Continued)
50
240
40
220mA-MODE (PROX_DR = 1)
30
ALS COUNT CHANGE
FROM +25°C (%)
220
IIRDR (mA)
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
60
TEMPERATURE (°C)
FIGURE 14. STABILITY OF ALS COUNT
OVER-TEMPERATURE (AT 0.00 LUX)
13
0
0
0.5
1.0
1.5
2.0
2.5
3.0
VI_ALS (V)
FIGURE 15. COMPLIANCE VOLTAGE VI_ALS'S EFFECTS
ON IALS (REFERENCED TO VI_ALS = 0V)
FN7722.0
November 18, 2010
ISL29030A
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
14
FN7722.0
November 18, 2010
ISL29030A
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
11/18/10
FN7722.0
CHANGE
Initial release.
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The
Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones,
handheld products, and notebooks. Intersil's product families address power management and analog signal
processing functions. Go to www.intersil.com/products for a complete list of Intersil product families.
*For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device
information page on intersil.com: ISL29030A
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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
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patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
15
FN7722.0
November 18, 2010
ISL29030A
Package Outline Drawing
L8.2.1x2.0
8 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN)
Rev 1, 12/09
2.10
A
B
6
6
PIN 1
INDEX AREA
PIN 1
INDEX AREA
0.50
2.00
1.50
1.50
0.20±0.05
(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 b 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 identifier may be
either a mold or mark feature.
16
FN7722.0
November 18, 2010