ISL29030AIROZ-T7 - Intersil Corporation

Low Power Ambient Light and Proximity Sensor with

Intelligent Interrupt and Sleep Modes - Analog and

Digital Out

ISL29030A

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 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

Features

• Works Under All Light Sources Including Sunlight

• Dual ADCs Measure ALS/Prox Concurrently

• Intelligent Interrupt Scheme Simplifies Microcontroller 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 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

•I

2C (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

IALS

VDD

GND

IRDR

INT

SDA

4 5

REXT SCL

THERMAL

PAD

*THERMAL PAD CAN BE CONNECTED TO GND OR

ELECTRICALLY ISOLATED

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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.

March 31, 2011

FN7722.1

ISL29030A

2FN7722.1

March 31, 2011

Block Diagram

Pin Descriptions

PIN NUMBER PIN NAME DESCRIPTION

0 T.PAD Thermal pad (connect to GND or float)

ALS Analog current output (proportional to ALS/IR Data Count: 420µA FSR)

2 VDD Positive supply: 2.25V to 3.63V

3GNDGround

4 REXT External resistor (499kΩ; 1%) connects this pin to ground

5SCLI

2C clock line The I2C bus lines can be pulled from 1.7V to above VDD; 3.63V max

6SDAI

2C data line

7INTInterrupt pin; logic output (open-drain) for interrupt

8 IRDR IR LED driver pin; current flows into ISL29030A from LED cathode

VDD

REXT GND

SCL

IR PHOTODIODE

LIGHT DATA

FOSC

IREF

IRDR

ARRAY

ALS PHOTODIODE

PROCESS

ALS AND IR

ARRAY

DUAL CHANNEL

ADCs

INT

COMMAND

DATA

I2C

IR DRIVER

INTERRUPT

SDA

1IALS

DAC

Ordering Information

PART NUMBER

(Notes 1, 2, 3)

TEMP. RANGE

(°C)

PACKAGE

TAPE AND REEL

(Pb-free)

PKG.

DWG. #

ISL29030AIROZ-T7 -40 to +85 8 Ld ODFN L8.2.1x2.0

ISL29030AIROZ-EVALZ 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.

ISL29030A

3FN7722.1

March 31, 2011

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 VDD = 3.0V, TA = +25°C, REXT = 499kΩ 1% tolerance. Boldface limits apply over the operating

temperature range, -40°C to +85°C.

PARAMETER DESCRIPTION CONDITION

MIN

(Note 6) TYP

MAX

(Note 6) UNIT

VDD Power Supply Range 2.25 3.0 3.63 V

SR_VDD Input Power-up Slew Rate VDD Rising Edge between 0.4V and 2.25V 0.5 V/ms

IDD_OFF Supply Current when Powered Down ALS_EN = 0; PROX_EN = 0 0.1 0.8 µA

IDD_NORM Supply Current for ALS+Prox in Sleep Time ALS_EN = 1; PROX_EN = 1 116 135 µA

IDD_PRX_SLP Supply Current for Prox in Sleep Time ALS_EN = 0; PROX_EN = 1 85 µA

IDD_ALS Supply Current for ALS ALS_EN = 1; PROX_EN = 0 102 µA

fOSC Internal Oscillator Frequency 5.25 MHz

tINTGR_ALS 12-bit ALS Integration/Conversion Time 88 100 112 ms

tINTGR_PROX 8-bit Prox Integration/Conversion Time 0.54 ms

IALS_OFF IALS Output Current when ALS = Disabled ALS_EN = 0; VI_ALS = 0V 3 100 nA

IALS_0 IALS Output Current When Dark ALS_EN = 1; ALS_RANGE = 1; E = 0 lux 0.1 0.6 µA

IALS_1 Current Output under Specified Conditions E = 53 lux, Fluorescent (Note 7),

ALS_RANGE = 0

161 µA

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 1 3Counts

DATAALS_F Full Scale ALS ADC Code EAMBIENT > Selected Range Maximum lux

(Note 10)

4095 Counts

ΔDATA

DATA

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

460 614 768 Counts

ISL29030A

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March 31, 2011

DATAPROX_0 Prox Measurement w/o Object in Path 1 2Counts

DATAPROX_F Full Scale Prox ADC Code 255 Counts

DATAPROX_1 Prox Measurement Result (Note 8) 35 46 57 Counts

trRise Time for IRDR Sink Current RLOAD = 15Ω at IRDR pin, 20% to 80% 500 ns

tfFall 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 98 110 120 mA

IIRDR_1 IRDR Sink Current PROX_DR = 1; VIRDR = 0.5V 220 mA

IIRDR_LEAK IRDR Leakage Current PROX_EN = 0; VDD = 3.63V (Note 9) -1 0.001 1µA

VIRDR Acceptable Voltage Range on IRDR Pin Register bit PROX_DR = 0 0.5 4.3 V

tPULSE Net IIRDR On Time Per PROX Reading 100 µs

VREF Voltage of REXT Pin 0.51 V

FI2CI2C Clock Rate Range 400 kHz

VI2CSupply Voltage Range for I2C Interface 1.7 3.63 V

VIL SCL and SDA Input Low Voltage 0.55 V

VIH SCL and SDA Input High Voltage 1.25 V

ISDA SDA Current Sinking Capability VOL = 0.4V 35mA

IINT INT Current Sinking Capability VOL = 0.4V 35mA

PSRRIRDR (ΔIIRDR)/(ΔVIRDR) PROX_DR = 0; VIRDR = 0.5V to 4.3V 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.

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

MIN

(Note 6) TYP

MAX

(Note 6) UNIT

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

VI2CSupply Voltage Range for I2C Interface 1.7 3.63 V

fSCL SCL Clock Frequency 400 kHz

VIL SCL and SDA Input Low Voltage 0.55 V

VIH SCL and SDA Input High Voltage 1.25 V

Vhys Hysteresis of Schmitt Trigger Input 0.05VDD V

VOL Low-level Output Voltage (Open-drain) at 4mA Sink

Current

0.4 V

IiInput Leakage for each SDA, SCL Pin -10 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

CiCapacitance for each SDA and SCL Pin 10 pF

ISL29030A

5FN7722.1

March 31, 2011

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

tRRise Time of both SDA and SCL Signals (Note 12) 20 +

0.1xCb

tFFall Time of both SDA and SCL Signals (Note 12) 20 +

0.1xCb

tSU:STO Set-up Time for STOP Condition 600 ns

tBUF Bus Free Time Between a STOP and START

Condition

1300 ns

CbCapacitive Load for Each Bus Line 400 pF

Rpull-up SDA and SCL system bus pull-up resistor Maximum is determined by tR and tF1kΩ

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.

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 DESCRIPTION CONDITION MIN TYP MAX UNIT

FIGURE 1. I2C TIMING DIAGRAM

ISL29030A

6FN7722.1

March 31, 2011

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

ADDR REG NAME

BIT

7654321 0DEFAULT

0x00 (n/a) (Reserved) (n/a)

0x01 CONFIGURE PROX_EN PROX_SLP[2:0] PROX_DR ALS_EN ALS_RANGE ALSIR_MODE 0x00

0x02 INTERRUPT PROX_FLAG PROX_PRST[1:0] (Write 0) ALS_FLAG ALS_PRST[1:0] 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 (Unused) ALSIR_DATA[11:8] 0x00

0x0E TEST1 (Write as 0x00) 0x00

0x0F TEST2 (Write as 0x00) 0x00

TABLE 2. REGISTER 0x00 (RESERVED)

BIT # ACCESS DEFAULT NAME FUNCTION/OPERATION

7:0 (n/a) (n/a) (n/a) Reserved - no need to read or write

TABLE 3. REGISTER 0x01 (CONFIGURE) - PROX/ALS CONFIGURATION

BIT # ACCESS DEFAULT NAME FUNCTION/OPERATION

7RW 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

3RW 0x00PROX_DR

(Prox Drive)

When = 0, IRDR behaves as a pulsed 110mA current sink

When = 1, IRDR behaves as a pulsed 220mA current sink

2RW 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

1RW 0x00ALS_RANGE

(ALS Range)

When = 0, ALS is in low-lux range

When = 1, ALS is in high-lux range

0RW 0x00ALSIR_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

ISL29030A

7FN7722.1

March 31, 2011

TABLE 4. REGISTER 0x02 (INTERRUPT) - PROX/ALS INTERRUPT CONTROL

BIT # ACCESS DEFAULT BIT NAME FUNCTION/OPERATION

7FLAG 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

4RW 0x00 Unused

(Write 0)

Unused register bit - write 0

3 FLAG 0x00 ALS_FLAG

(ALS FLAG)

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”

2:1 RW 0x00 ALS_PRST

(ALS Persist)

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

0RW 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 FUNCTION/OPERATION

7:0 RW 0x00 PROX_LT

(Prox Threshold)

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 FUNCTION/OPERATION

7:0 RW 0xFF PROX_HT

(Prox Threshold)

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 FUNCTION/OPERATION

7:0 RW 0x00 ALSIR_LT[7:0]

(ALS/IR Low Thr.)

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 FUNCTION/OPERATION

7:0 RW 0xFF ALSIR_HT[11:4]

(ALS/IR High Thr.)

Upper 8 bits (of 12 bits) for ALS/IR high interrupt threshold

ISL29030A

8FN7722.1

March 31, 2011

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 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)Unused bits.

3:0 RO 0x00 ALSIR_DATA

(ALS/IR Data)

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 FUNCTION/OPERATION

7:0 RW 0x00 (Write as 0x00) Test mode register. When 0x00, in normal operation.

FIGURE 2. I2C DRIVER TIMING DIAGRAM FOR MASTER AND SLAVE CONNECTED TO COMMON BUS

START WA A

A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A A6 A5 A4 A3 A2 A1 A0 W A

A A A D7 D6D5D4 D3D2 D1D0

1357 1357 123456 9246

STOP START

SDA DRIVEN BY MASTER

DEVICE ADDRESS

SDA DRIVEN BY ISL29030A

DATA BYTE0REGISTER ADDRESS

SLAVE

DEVICE ADDRESS

I2C DATA

SDA DRIVEN BY MASTER

2468

924689 78135789

I2C SDA

I2C CLK

MASTER

(ISL29030A)

ISL29030A

9FN7722.1

March 31, 2011

Principles of Operation

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).

For more information about the I2C standard, please consult the

Philips™ I2C specification documents.

Photodiodes and ADCs

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.

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.

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

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 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.

Proximity Sensing

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

ALS

ACTIVE

100ms 100ms 100ms

PROX

SENSOR

ACTIVE

IRDR

(CURRENT

DRIVER)

ALS CONVERSION

TIME = 100ms

(FIXED)

0.54ms FOR

PROX

CONVERSION

SERIES OF

CURRENT PULSES

TOTALING 0.1ms

SLEEP TIME

(PROX_SLP)

100ms 100ms

SEVERAL µs BETWEEN

CONVERSIONS

TIME

FIGURE 3. TIMING DIAGRAM FOR PROX/ALS EVENTS - NOT TO SCALE

ISL29030A

10 FN7722.1

March 31, 2011

110mA current pulse. If this bit is high, the load on IRDR sees a

fixed 220mA current pulse, as shown in Figure 4.

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.

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.

Interrupt persistency is another useful option available for both

ALS and proximity measurements. Persistency requires a user-

specified number (X) of consecutive 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 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

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).

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.

FIGURE 4. CURRENT DRIVE MODE OPTIONS

PIN 8 - IRDR

220mA

(PROX_DR = 1)

(IRDR IS HI-Z WHEN

NOT DRIVING)

110mA

(PROX_DR = 0)

IlRDR AVG()

IlRDR PEAK()

100μs×

TSLEEP 540μs+

--------------------------------------------------------

=(EQ. 1)

Ecalc αRANGE OUTADC

×=(EQ. 2)

ISL29030A

11 FN7722.1

March 31, 2011

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.

Typical Circuit

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.

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.

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.

TABLE 15. ALS SENSITIVITY AT DIFFERENT RANGES

ALS_RANGE

αRANGE

(Lux/Count)

0 0.0326

1 0.522

IALS

GND

REXT

SDA

INT 7

IRDR 8

ISL29030A

10kΩ

REXT

499kΩ

VDD

MICROCONTROLLER

INT

SDA

SLAVE_0 SLAVE_1 I2C SLAVE_n

I2C MASTER

SCL

SDA

SCL

SDA

VI2C_PULL-UP

10kΩ

SCL

2VDD

0.1µF

FIGURE 5. ISL29030A TYPICAL CIRCUIT

SCL

1µF

VIR-LED

3.5kΩ

ISL29030A

12 FN7722.1

March 31, 2011

Typical Performance Curves VDD = 3.0V, REXT = 499kΩ

FIGURE 6. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED

BY LUMINOUS INTENSITY (LUX)

FIGURE 7. ISL29030A SENSITIVITY TO DIFFERENT

WAVELENGTHS

FIGURE 8. ANGULAR SENSITIVITY FIGURE 9. ALS LINEARITY OVER 3 LIGHT SOURCES (2000 LUX

RANGE)

FIGURE 10. PROX COUNTS vs DISTANCE WITH 10CM x 10CM

REFLECTOR (USING ISL29030A EVALUATION BOARD)

FIGURE 11. VDD vs IDD FOR VARIOUS MODES OF OPERATION (IALS

PIN FLOATING)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

350 550 750 950

WAVELENGTH (nm)

NORMALIZED INTENSITY

FLUORESCENT

SUN

INCAND.

HALOGEN

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

300 400 500 600 700 800 900 1000 1100

WAVELENGTH (nm)

NORMALIZED RESPONSE

ALS

HUMAN EYE

IR/PROX

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

-90 -60 -30 0 30 60 90

ANGULAR OFFSET (°)

NORMALIZED SENSITIVITY

500

1000

1500

2000

2500

0 1000 2000 3000 4000 5000

ALS CODE (12-BIT)

FLUORESCENT

INCANDESCENT

LUX METER READING (LX)

HALOGEN

100

150

200

250

300

0 20 40 60 80 100 120 140 160 180 200

DISTANCE (mm)

PROX COUNTS (8-BIT)

WHITE COPY PAPER

220mA MODE

18% GRAY CARD

110mA MODE

100

120

140

160

2.25 2.40 2.55 2.85 3.00 3.15 3.45

INPUT VDD (V)

MEASURED IDD (µA)

ALS+PROX (DURING PROX SLEEP)

ALS-ONLY

3.603.302.70

PROX (DURING PROX SLEEP)

ISL29030A

13 FN7722.1

March 31, 2011

FIGURE 12. IRDR PULSE AMPLITUDE vs VIRDR FIGURE 13. STABILITY OF ALS COUNT OVER-TEMPERATURE

(AT 300 LUX)

FIGURE 14. STABILITY OF ALS COUNT

OVER-TEMPERATURE (AT 0.00 LUX)

FIGURE 15. COMPLIANCE VOLTAGE (VI_ALS) EFFECTS ON IALS

(REFERENCED TO VI_ALS = 0V)

Typical Performance Curves VDD = 3.0V, REXT = 499kΩ (Continued)

100

120

140

160

180

200

220

240

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

220mA-MODE (PROX_DR = 1)

110mA-MODE (PROX_DR = 0)

VIRDR (V)

IIRDR (mA)

TEMPERATURE (°C)

ALS COUNT CHANGE

-50

-30

-10

-40 -20 0 20 40 60 80

FROM +25°C (%)

-20

-40

-40 10 60

TEMPERATURE (°C)

ALS CODE (12-BIT)

100

0 0.5 1.0 1.5 2.0 2.5 3.0

VI_ALS (V)

IALS (%)

ISL29030A

14 FN7722.1

March 31, 2011

FIGURE 16. 8 LD ODFN SENSOR LOCATION OUTLINE - DIMENSIONS IN mm

2.00

SENSOR OFFSET

0.43

0.50

2.10

0.42

ISL29030A

Intersil products are manufactured, assembled and tested utilizing ISO9000 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

FN7722.1

March 31, 2011

For additional products, see www.intersil.com/product_tree

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

To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff

FITs are available from our website at: http://rel.intersil.com/reports/sear

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

ISL29030A

16 FN7722.1

March 31, 2011

Package Outline Drawing

L8.2.1x2.0

8 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN)

Rev 3, 1/11

8X 0 . 35 ± 0 . 05

B0.10 AC

0.20±0.05

0.75

0.50

1.50 1.50

0.25

0.15

located within the zone indicated. The pin #1 indentifier may be

Unless otherwise specified, tolerance : Decimal ± 0.05

Tiebar shown (if present) is a non-functional feature.

The configuration of the pin #1 identifier is optional, but must be

between 0.25mm and 0.35mm from the terminal tip.

Dimension applies to the metallized terminal and is measured

Dimensions in ( ) for Reference Only.

Dimensioning and tolerancing conform to ASME Y14.5m-1994.

either a mold or mark feature.

Dimensions are in millimeters.1.

NOTES:

DETAIL "X"

SIDE VIEW

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW

(2X) 0.10

INDEX AREA

PIN 1

SEATING PLANE

BASE PLANE

0.08

0.10

SEE DETAIL "X"

0 . 00 MIN.

0 . 05 MAX.

0 . 2 REF

0.70±0.05

2.10

2.00

(6x0.50)

(8x0.20)

(8x0.55)

(0.75)

(1.50)

2.10

2.50

(8x0.20)

BOTTOM VIEW

INDEX AREA

PIN 1