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

Low Power Ambient Light and Proximity Sensor with
Intelligent Interrupt and Sleep Modes - Analog and
Digital Out
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.
• Works Under All Light Sources Including Sunlight
• Dual ADCs Measure ALS/Prox Concurrently
• Intelligent Interrupt Scheme Simplifies Microcontroller Code
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 the 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 that is outside a set window. A
proximity interrupt is defined as a measurement over a
threshold limit. The user can configure the device so that ALS
and proximity interrupts occur simultaneously, up to 16 times
in a row, before the interrupt pin is activated.
The ISL29030A is designed to operate at 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
•
•
•
•
•
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 Cancelation (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)
IALS
1
8
IRDR
Applications
VDD
2
7
INT
GND
3
6
SDA
REXT
4
5
SCL
• 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
THERMAL
PAD
*THERMAL PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
March 31, 2011
FN7722.1
Ambient Light Sensing
1
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, 2011. 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
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
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)
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 TB477.
2
FN7722.1
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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.
Electrical Specifications
temperature range, -40°C to +85°C.
PARAMETER
VDD
VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance. Boldface limits apply over the operating
DESCRIPTION
CONDITION
Power Supply Range
MIN
(Note 6)
TYP
MAX
(Note 6)
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
Supply Current for Prox in Sleep Time
ALS_EN = 0; PROX_EN = 1
85
µA
Supply Current for ALS
ALS_EN = 1; PROX_EN = 0
102
µA
5.25
MHz
IDD_NORM
IDD_PRX_SLP
IDD_ALS
fOSC
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 7),
ALS_RANGE = 0
161
IALS_2
Current Output under Specified Conditions
E = 320 lux, Fluorescent (Note 7)
ALS_RANGE = 1
40
60
80
µA
IALS_F
IALS Output Current At Full Scale
ALS_EN = 1; ALS Code = 4095
380
420
460
µA
VI_ALS
Compliance Voltage on IALS w/ 5% Variation
in Output Current
ALS_EN = 1; ALS Code = 4095
0
VDD-0.8
V
DATAALS_0
ALS Result when Dark
EAMBIENT = 0 lux, 2k Range
3
Counts
DATAALS_F
Full Scale ALS ADC Code
EAMBIENT > Selected Range Maximum lux
(Note 10)
4095
Counts
Count Output Variation Over Three Light
Sources: Fluorescent, Incandescent and
Sunlight
Ambient Light Sensing
±10
%
DATAALS_1
Light Count Output with LSB of
0.0326 lux/count
E = 53 lux, Fluorescent (Notes 7, 10),
ALS_RANGE = 0
1638
Counts
DATAALS_2
Light Count Output With LSB of
0.522 lux/count
E = 320 lux, Fluorescent (Note 7)
ALS_RANGE = 1
ΔDATA
DATA
3
1
460
614
µA
768
Counts
FN7722.1
March 31, 2011
ISL29030A
Electrical Specifications VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance. Boldface limits apply over the operating
temperature range, -40°C to +85°C. (Continued)
PARAMETER
DESCRIPTION
CONDITION
DATAPROX_0
Prox Measurement w/o Object in Path
DATAPROX_F
Full Scale Prox ADC Code
DATAPROX_1
Prox Measurement Result
(Note 8)
tr
Rise Time for IRDR Sink Current
RLOAD = 15Ω at IRDR pin, 20% to 80%
tf
TYP
1
35
Fall time for IRDR Sink Current
RLOAD = 15Ω at IRDR pin, 80% to 20%
IIRDR_0
IRDR Sink Current
PROX_DR = 0; VIRDR = 0.5V
IIRDR_1
IRDR Sink Current
PROX_DR = 1; VIRDR = 0.5V
IIRDR_LEAK
MIN
(Note 6)
46
110
PROX_EN = 0; VDD = 3.63V (Note 9)
-1
Register bit PROX_DR = 0
0.5
tPULSE
Net IIRDR On Time Per PROX Reading
100
VREF
Voltage of REXT Pin
0.51
FI2C
I2C Clock Rate Range
VI2C
Supply Voltage Range for I2C Interface
SCL and SDA Input High Voltage
ISDA
SDA Current Sinking Capability
IINT
PSRRIRDR
Counts
Counts
57
Counts
ns
ns
120
220
Acceptable Voltage Range on IRDR Pin
SCL and SDA Input Low Voltage
2
255
500
98
IRDR Leakage Current
VIL
UNIT
500
VIRDR
VIH
MAX
(Note 6)
0.001
1.7
mA
1
µA
4.3
V
µs
V
400
kHz
3.63
V
0.55
V
1.25
VOL = 0.4V
3
INT Current Sinking Capability
VOL = 0.4V
3
(ΔIIRDR)/(ΔVIRDR)
PROX_DR = 0; VIRDR = 0.5V to 4.3V
mA
V
5
mA
5
mA
4
mA/V
NOTES:
6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
7. 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.
8. An 850nm infrared LED is used to test PROX/IR sensitivity in an internal test mode.
9. Ability to guarantee IIRDR leakage of ~1nA is limited by test hardware.
10. For ALS applications under light-distorting glass, please see “ALS Range 1 Considerations” on page 10.
I2C Electrical Specifications
For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance
(Note 11). Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
3.63
V
VI2C
Supply Voltage Range for I2C Interface
fSCL
SCL Clock Frequency
400
kHz
VIL
SCL and SDA Input Low Voltage
0.55
V
VIH
SCL and SDA Input High Voltage
Vhys
Hysteresis of Schmitt Trigger Input
VOL
Low-level Output Voltage (Open-drain) at 4mA Sink
Current
Ii
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
4
1.7
1.25
V
0.05VDD
V
-10
0.4
V
10
µA
50
ns
900
ns
10
pF
FN7722.1
March 31, 2011
ISL29030A
I2C Electrical Specifications
For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance
(Note 11). Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
tHD:STA
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
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
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:
11. I2C limits are based on design/simulation and are not production tested.
12. Cb is the capacitance of the bus in pF.
FIGURE 1. I2C TIMING DIAGRAM
5
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March 31, 2011
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
5
4
3
2
1
0
0x00
(n/a)
0x01
CONFIGURE
PROX_EN
0x02
INTERRUPT
PROX_FLAG
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
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
(Reserved)
PROX_SLP[2:0]
PROX_PRST[1:0]
(n/a)
PROX_DR
(Write 0)
DEFAULT
ALS_FLAG
ALSIR_HT[3:0]
ALS_EN
ALS_RANGE ALSIR_MODE
ALS_PRST[1:0]
INT_CTRL
ALSIR_LT[11:8]
(Unused)
ALSIR_DATA[11:8]
0x00
0x00
0xF0
0x00
Register Descriptions
TABLE 2. REGISTER 0x00 (RESERVED)
BIT #
ACCESS
DEFAULT
NAME
7:0
(n/a)
(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
6
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March 31, 2011
ISL29030A
TABLE 4. REGISTER 0x02 (INTERRUPT) - PROX/ALS INTERRUPT CONTROL
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7
FLAG
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”
6:5
RW
0x00
PROX_PRST
(Prox Persist)
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
4
RW
0x00
Unused
(Write 0)
3
FLAG
0x00
ALS_FLAG
(ALS FLAG)
2:1
RW
0x00
ALS_PRST
(ALS Persist)
0
RW
0x00
INT_CTRL
(Interrupt Control)
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
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)
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
FUNCTION/OPERATION
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 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.)
7
FUNCTION/OPERATION
Upper 8 bits (of 12 bits) for ALS/IR high interrupt threshold
FN7722.1
March 31, 2011
ISL29030A
TABLE 10. REGISTER 0x08 (PROX_DATA) - PROXIMITY SENSOR DATA
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RO
0x00
PROX_DATA
(Proximity Data)
Results of 8-bit proximity sensor ADC conversion
TABLE 11. REGISTER 0x09 (ALSIR_DT1) - ALS/IR SENSOR DATA (LOWER 8 BITS)
BIT #
ACCESS
DEFAULT
BIT NAME
7:0
RO
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
FUNCTION/OPERATION
7:0
RW
0x00
(Write as 0x00)
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)
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
8
FN7722.1
March 31, 2011
ISL29030A
Principles of Operation
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.
I2C Interface
The ISL29030A 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 seven 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).
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
For more information about the I2C standard, please consult the
Philips™ I2C specification documents.
Photodiodes and ADCs
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.
The ISL29030A contains two photodiode arrays that convert
photons (light) into current. The ALS photodiodes are constructed to
mimic the human eye wavelength response curve to visible light
(see Figure 7). The ALS photodiode 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.
When the part is programmed for infrared (IR) sensing
(ALSIR_MODE = 1; ALS_EN = 1), infrared light is converted into a
current and is digitized by the same ALS ADC. The result of an IR
conversion is strongly related to the amount of IR energy incident
on the sensor, but it is unitless and is referred to in digital counts.
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.
When proximity sensing is enabled (PROX_EN = 1), the external
IR LED is driven through the IRDR pin for 0.1ms by the built-in IR
LED driver. The amplitude of the IR LED current depends on
Register 1 bit 3: PROX_DR. If this bit is low, the load sees a fixed
Proximity Sensing
The proximity sensor is an 8-bit ADC that operates in a similar
fashion. When proximity sensing is enabled, the IRDR pin drives
a user-supplied infrared LED, the emitted IR reflects off an object
(i.e., a human head) back into the ISL29030A, and a sensor
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
9
FN7722.1
March 31, 2011
ISL29030A
110mA current pulse. If this bit is high, the load on IRDR sees a
fixed 220mA current pulse, as shown in Figure 4.
220mA
(PROX_DR = 1)
110mA
(PROX_DR = 0)
PIN 8 - IRDR
(IRDR IS HI-Z WHEN
NOT DRIVING)
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 simultaneous ALS and Prox interrupts to happen before
changing the state of the interrupt pin, the user sets this bit high.
If the user wants the interrupt pin to change state when either
the ALS or the Proximity interrupt flag goes high, the user leaves
this bit at its default value of 0.
Analog-Out IALS Pin
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 shown by the IR spectral response 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 ( AVG ) = -------------------------------------------------------T SLEEP + 540μs
interrupt persistency options. See ALS_PRST and PROX_PRST
bits in Register 2.
(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 shown in Figure 11.
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 toward a more
independent light sensor that 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 high and low threshold values to these
registers, and the ISL29030A issues an ALS interrupt flag if the
actual counts stored in Registers 0x9 and 0xA are outside the
user-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 greater than the high threshold a user-specified consecutive
number of times (X; set by the user; see next paragraph). The
proximity interrupt flag is cleared when the proximity data is
lower than the low proximity threshold X consecutive times, or
when the user writes “0” to PROX_FLAG.
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), the user
must switch to range 2 (change the ALS_RANGE bit from 0 to 1)
and re-measure 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.
VDD Power-up and Power Supply
Considerations
At power-up, ensure a VDD slew rate of 0.5V/ms or greater. After
power-up, or if the power supply temporarily deviates from the
factory specification (2.25V to 3.63V), Intersil recommends the
user write the following: 0x00 to register 0x01, 0x29 to register
0x0F, 0x00 to register 0x0E, and 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, then set VDD = 0V for 1 second
or more, power up again at the required slew rate, and write the
desired values to the registers.
Power-Down
The user can set power-down in two ways. 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
When in ALS mode, the ISL29030A ADC output codes are directly
proportional to lux (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, which is to plug in, is
determined by the range bit, ALS_RANGE (register 0x1 bit 1) and
is independent of the light source type.
Interrupt persistency is another useful option available for both
ALS and proximity measurements. Persistency requires a userspecified number (X) of consecutive interrupt flags before the INT
pin is driven low. Both ALS and Prox have their own independent
10
FN7722.1
March 31, 2011
ISL29030A
Typical Circuit
TABLE 15. ALS SENSITIVITY AT DIFFERENT RANGES
ALS_RANGE
αRANGE
(Lux/Count)
0
0.0326
1
0.522
A typical application for the ISL29030A is shown in Figure 5. The
ISL29030A I2C address is internally hardwired as 0b1000100.
The device can be tied onto a system I2C bus together with other
I2C compliant devices.
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 ADCs have excellent noise-rejection
characteristics for periodic noise sources for which 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, the factory-set integration time is
100ms, which is 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 absorbs all light and reflects 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 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.
Soldering 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.
Suggested PCB Footprint
It is important that users see TB477, “Surface Mount Assembly
Guidelines for Optical Dual FlatPack No Lead (ODFN) Package”
before starting ODFN product board mounting.
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. To ensure best performance,
route the supply and I2C traces as far as possible from all
sources of noise, and place a 0.1µF and 1µF power supply
decoupling capacitor close to the device.
ALS Sensor Window Layout
Special care should be taken to ensure that the sensor is
uniformly illuminated, as shown in Figure 16, “8 LD ODFN
SENSOR LOCATION OUTLINE - DIMENSIONS IN mm”. Shadows
from window openings that affect uniform illumination can
distort measurement results.
VI2C_PULL-UP
R1
10kΩ
R2
10kΩ
I2C MASTER
R3
10kΩ
MICROCONTROLLER
INT
SDA
SCL
VDD
VIR-LED
SLAVE_0
V
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
ISL29030A
FIGURE 5. ISL29030A TYPICAL CIRCUIT
11
FN7722.1
March 31, 2011
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% GRAY 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)
FN7722.1
March 31, 2011
ISL29030A
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)
13
60
0
0
0.5
1.0
1.5
2.0
2.5
3.0
VI_ALS (V)
FIGURE 15. COMPLIANCE VOLTAGE (VI_ALS) EFFECTS ON IALS
(REFERENCED TO VI_ALS = 0V)
FN7722.1
March 31, 2011
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
FN7722.1
March 31, 2011
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
CHANGE
3/18/2011
FN7722.1
Page 7, Table 2, changed ACCESS from RO to (n/a)
Page 10, Eq. 1, added “+ 540μs” to the divisor, TSLEEP. Changed IIRDR(AVE) to IIRDR(AVG).
Page 10, in “ALS Range 1 Considerations”section, removed reference to document of that title.
Page 11, added section, “ALS Sensor Window Layout”
Page 16, replaced Package Outline Drawing Rev 1, dated 12/09 with Rev 3, dated 1/11.
Converted to latest Intersil datasheet template
11/18/10
FN7722.0
Initial release
Products
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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
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15
FN7722.1
March 31, 2011
ISL29030A
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.
16
FN7722.1
March 31, 2011