ISL29033IROZ-EVALZ_技术文档

Ultra-Low Lux, Low Power, Integrated Digital Ambient

Light Sensor with Interrupt Function

ISL29033

Features

The ISL29033 is an integrated ambient and infrared light to

• Ambient light sensing

2

digital converter with I C (SMBus Compatible) interface. Its

• Simple output code directly proportional to Lux

• Variable conversion resolution up to 16 bits

• Adjustable sensitivity up to 520 counts per Lux

advanced, self-calibrated photodiode array emulates human

eye response with excellent IR rejection. The on-chip 16-bit

ADC is capable of rejecting 50Hz and 60Hz flicker caused by

artificial light sources. The lux range select feature allows

users to program the lux range for optimized counts/lux.

Power consumption can be reduced to less than 0.3µA when

powered down.

• Measurement range: 0.0019 to 8,000lux with four

selectable ranges

• Program interrupt feature

• Light sensor close to human eye response

- Excellent light sensor IR and UV rejection

The ISL29033 supports a software and hardware interrupt that

remains asserted until the host clears it through the I C

2

interface. The function of ADC conversion continues without

stopping after interrupt is asserted.

• 75μA max operating current

- 0.3μA max shutdown current

Designed to operate on supplies from 2.25V to 3.63V with an

2

• 6 Ld 2.0mmx2.1mmx0.7mm ODFN package

I C supply from 1.7V to 3.63V, the ISL29033 is specified for

operation over the -40°C to +85°C ambient temperature

range.

Applications

• Display and keypad dimming adjustment for:

- Mobile devices: smart phone, PDA, GPS

- Computing devices: notebook PC, webpad

Related Literature

• See AN1422 “Light Sensor Applications”

- Consumer devices: LCD-TV, digital picture frame, digital

camera

• Industrial and medical light sensing

VDD

1

COMMAND

REGISTER

PHOTODIODE

ARRAY

INTEGRATION

LIGHT

DATA

REGISTER

ADC

PROCESS

SCL

SDA

5

6

2

I C/SMBus

IREF

INTERRUPT

REGISTER

f

OSC

3

2

4

REXT

GND

INT

FIGURE 1. BLOCK DIAGRAM

February 25, 2013

FN7656.2

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

1

2

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. I C Bus is a registered trademark

owned by NXP Semiconductors Netherlands, B.V. All other trademarks mentioned are the property of their respective owners.

ISL29033

Pin Descriptions

Pin Configuration

ISL29033

(6 LD ODFN)

TOP VIEW

NUMBER PIN NAME

DESCRIPTION

Thermal Pad (connect to GND, or float)

Positive supply: 2.25V to 3.63V

Ground

PD

1

PD

VDD

GND

1

2

3

6

5

4

SDA

SCL

INT

VDD

GND

REXT

2

PD*

3

External resistor pin for ADC reference; connect

this pin to ground through a (nominal) 499kΩ

resistor.

REXT

4

INT

Interrupt pin; low for interrupt alarming. INT pin

is open drain. INT remains asserted until the

interrupt flag status bit is reset.

*EXPOSED PAD CAN BE CONNECTED TO GND OR

ELECTRICALLY ISOLATED

2

5

6

SCL

SDA

I C serial clock

2

I C serial data

Ordering Information

PACKAGE

TAPE AND REEL

(Pb-free)

PART NUMBER

(Notes 1, 2, 3, 4)

TEMP. RANGE

(°C)

PKG.

DWG. #

ISL29033IROZ-T7

-40 to +85

6 Ld ODFN

L6.2x2.1

ISL29033IROZ-EVALZ

NOTES:

Evaluation Board

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 ISL29033. For more information on MSL please see Tech Brief TB477.

4. The part marking is located on the bottom of the part.

FN7656.2

February 25, 2013

2

ISL29033

Absolute Maximum Ratings (T = +25°C)

Thermal Information

A

V

2

Supply Voltage between V and GND . . . . . . . . . . . . . . . . . . . . . .4.0V

DD

Thermal Resistance (Typical)

θ

_JA(°C/W)

88

DD

6 Ld ODFN (Note 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I C Bus Pin Voltage (SCL, SDA). . . . . . . . . . . . . . . . . . . . . . . . . -0.2V to 4.0V

2

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

I C Bus Pin Current (SCL, SDA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA

R

Pin Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.2V to VDD + 0.5V

EXT

INT Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VDD + 0.5V

INT Pin Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA

ESD Rating

Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV

Recommended Operating Conditions

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.25V to 3.63V

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product

reliability and result in failures not covered by warranty.

NOTE:

5. θ is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech

JA

Brief TB477.

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: T = T = T

J

C

A

Electrical Specifications

V

= 3.0V, T = +25°C, R

= 499kΩ 1% tolerance, 16-bit ADC operation, unless otherwise

EXT

DD

A

specified.

MIN

MAX

PARAMETER

DESCRIPTION

Power Supply Range

CONDITION

(Note 6)

TYP

(Note 6)

UNIT

V

2.25

3.63

75

DD

I

Supply Current

65

µA

V

DD

I

Supply Current when Powered Down

Software disabled or auto power-down

16-bit ADC data

0.01

0.3

DD1

2

V

Supply Voltage Range for I C Interface

1.7

3.63

740

I2C

f

Internal Oscillator Frequency

600

670

100

kHz

ms

kHz

OSC

t

ADC Integration/Conversion Time

INT

2

F

I C Clock Rate Range

1 to

400

I2C

DATA_0

DATA_F

Count Output when Dark

Full Scale ADC Code

E = 0 lux, Range 1 (125 lux)

Ambient Light Sensing

1

5

Counts

65535 Counts

%

ΔDATA

DATA

Count Output Variation Over Three Light

Sources: Fluorescent, Incandescent and

Sunlight

±10

DATA_1

DATA_2

Light Count Output with LSB of

0.0019 Lux/count

E = 37.5 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 1 (125 lux)

16000 20000 24000 Counts

Light Count Output with LSB of

0.0075 Lux/count

E = 37.5 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 2 (500 lux)

5000

1250

312

Counts

DATA_3

Light Count Output with LSB of

0.03 Lux/count

E = 37.5 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 3 (2k lux)

DATA_4

Light Count Output with LSB of

0.12 Lux/count

E = 37.5 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 4 (8k lux)

DATA_IR1

DATA_IR2

Infrared Count Output

E = 20 lux Solar light (Note 8),

Ambient light sensing, Range 1 (125 lux)

16000 20000 24000 Counts

Infrared Count Output

E = 20 lux Solar light (Note 8),

5000

Counts

Ambient light sensing, Range 2 (500 lux)

FN7656.2

February 25, 2013

3

ISL29033

Electrical Specifications

V

= 3.0V, T = +25°C, R

= 499kΩ 1% tolerance, 16-bit ADC operation, unless otherwise

EXT

DD

A

specified. (Continued)

MIN

MAX

PARAMETER

DATA_IR3

DESCRIPTION

Infrared Count Output

CONDITION

(Note 6)

TYP

(Note 6)

UNIT

E = 20 lux Solar light (Note 8),

1250

Counts

Ambient light sensing, Range 3 (2000 lux)

DATA_IR4

Infrared Count Output

E = 20 lux Solar light (Note 8),

312

Counts

Ambient light sensing, Range 4 (8000 lux)

V

Voltage of REXT Pin

0.52

V

REF

V

SCL and SDA Input Low Voltage

SCL and SDA Input High Voltage

SDA Current Sinking Capability

INT Current Sinking Capability

0.55

IL

V

1.25

4

V

IH

I

V

= 0.4V

5

mA

SDA

OL

I

4

INT

OL

Electrical Specifications

V

= 3.0V, T = +25°C, R = 1MΩ 1% tolerance, 16-bit ADC operation,

EXT

DD

A

unless otherwise specified.

MIN

(Note 6)

MAX

(Note 6) UNIT

PARAMETER

DESCRIPTION

Power Supply Range

CONDITION

TYP

V

2.25

3.63

50

V

DD

I

Supply Current

42

µA

V

DD

I

Supply Current when Powered Down

Software disabled or auto power-down

16-bit ADC data

0.01

0.3

DD1

2

V

Supply Voltage Range for I C Interface

1.7

3.63

385

I2C

f

Internal Oscillator Frequency

305

340

200

kHz

ms

kHz

OSC

t

ADC Integration/Conversion Time

INT

2

F

I C Clock Rate Range

1 to

400

I2C

DATA_0

DATA_F

Count Output when Dark

Full Scale ADC Code

E = 0 lux, Range 1 (125 lux)

Ambient Light Sensing

1

10

Counts

65535 Counts

%

ΔDATA

DATA

Count Output Variation Over Three Light

Sources: Fluorescent, Incandescent and

Sunlight

±10

DATA_1

DATA_2

Light Count Output with LSB

of 0.00095 Lux/count

E = 18.75 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 1 (62.5 lux)

15000 20000 25000 Counts

Light Count Output with LSB

of 0.000375 Lux/count

E = 18.75 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 2 (250 lux)

5000

1250

312

Counts

DATA_3

Light Count Output with LSB

of 0.015 Lux/count

E = 18.75 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 3 (1k lux)

DATA_4

Light Count Output with LSB

of 0.6 Lux/count

E = 18.75 lux, Fluorescent light (Note 7),

Ambient light sensing, Range 4 (4k lux)

DATA_IR1

DATA_IR2

DATA_IR3

DATA_IR4

Infrared Count Output

Voltage of REXT Pin

E = 10 lux Solar light (Note 8),

Ambient light sensing, Range 1 (62.5 lux)

15000 20000 25000 Counts

E = 10 lux Solar light (Note 8),

Ambient light sensing, Range 2 (250 lux)

5000

1250

312

Counts

V

E = 10 lux Solar light (Note 8),

Ambient light sensing, Range 3 (1000 lux)

E = 10 lux Solar light (Note 8),

Ambient light sensing, Range 4 (4000 lux)

V

0.52

REF

FN7656.2

February 25, 2013

4

ISL29033

Electrical Specifications

V

= 3.0V, T = +25°C, R

= 1MΩ 1% tolerance, 16-bit ADC operation,

EXT

DD

A

unless otherwise specified. (Continued)

MIN

MAX

PARAMETER

DESCRIPTION

SCL and SDA Input Low Voltage

SCL and SDA Input High Voltage

SDA Current Sinking Capability

INT Current Sinking Capability

CONDITION

(Note 6)

TYP

(Note 6) UNIT

V

0.55

V

IL

V

1.25

4

V

IH

I

V

= 0.4V

5

mA

SDA

OL

I

4

INT

OL

NOTES:

6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.

7. A 550nm green LED is used in production test. The 550nm LED irradiance is calibrated to produce the same DATA count as a fluorescent light with

illuminance at the stated lux.

8. An 850nm IR LED is used in production test. The 850nm LED irradiance is calibrated to produce the same DATA_IR count as solar light with

illuminance at the stated lux.

2

I C Electrical Specifications For SCL and SDA (Figure 2), unless otherwise noted, V = 3V, T = +25°C, R

= 499kΩ 1%

DD

A

EXT

and 1MΩ 1% tolerance.

MIN

MAX

PARAMETER

DESCRIPTION

CONDITION

(Note 6)

TYP

(Note 6)

UNIT

V

Supply Voltage Range for I²C Interface

SCL Clock Frequency

1.7

3.63

I2C

f

400

kHz

V

SCL

V

SCL and SDA Input Low Voltage

SCL and SDA Input High Voltage

Hysteresis of Schmitt Trigger Input

0.55

IL

V

1.25

V

IH

V

0.05V

V

hys

DD

V

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

Current

0.4

V

OL

I

Input Leakage for each SDA, SCL Pin

-10

10

50

µA

ns

i

t

Pulse Width of Spikes that must be Suppressed by

the Input Filter

SP

SCL Falling Edge to SDA Output Data Valid

Capacitance for each SDA and SCL Pin

Hold Time (Repeated) START Condition

900

10

ns

pF

ns

AA

C

i

t

After this period, the first clock pulse

is generated.

600

HD:STA

t

LOW Period of the SCL Clock

HIGH Period of the SCL Clock

Set-up Time for a Repeated START Condition

Data Hold Time

Measured at the 30% of V crossing

DD

1300

600

30

ns

LOW

t

HIGH

SU:STA

HD:DAT

t

Data Set-up Time

100

SU:DAT

t

Rise Time of both SDA and SCL Signals

(Note 9)

20 +

R

0.1xC

b

t

Fall Time of both SDA and SCL Signals

20 +

ns

F

0.1xC

b

t

Set-up Time for STOP Condition

600

ns

SU:STO

t

Bus Free Time Between a STOP and START

Condition

1300

1

BUF

C

Capacitive Load for Each Bus Line

400

pF

b

R

SDA and SCL System Bus Pull-up Resistor

Maximum is determined by t and t

F

kΩ

pull-up

R

FN7656.2

February 25, 2013

5

ISL29033

2

I C Electrical Specifications For SCL and SDA (Figure 2), unless otherwise noted, V = 3V, T = +25°C, R

= 499kΩ 1%

DD

A

EXT

and 1MΩ 1% tolerance. (Continued)

MIN

(Note 6)

MAX

(Note 6)

PARAMETER

DESCRIPTION

CONDITION

TYP

UNIT

µs

V

t

Data Valid Time

0.9

VD;DAT

t

Data Valid Acknowledge Time

Noise Margin at the LOW Level

Noise Margin at the HIGH Level

0.9

VD:ACK

V

0.1V

0.2V

nL

DD

V

nH

DD

NOTE:

9. C is the capacitance of the bus in pF.

b

Ambient Light

Principles of Operation

There are four operational modes in ISL29033: Programmable ALS

once with auto power-down, programmable IR sensing once with

auto power-down, programmable continuous ALS sensing, and

programmable continuous IR sensing. These four modes can be

programmed in series to fulfill the application needs. The detailed

program configuration is shown in “BLOCK DIAGRAM” on page 1.

Photodiodes and ADC

The ISL29033 contains two photodiode arrays that convert light into

current. The spectral response for ambient light sensing and

infrared (IR) sensing is shown in Figure 8 in the “Typical

Performance Curves” section on page 12. After light is converted to

current during the light signal process, the current output is

converted to digital by a built-in 16-bit Analog-to-Digital Converter

When the part is programmed for ambient light sensing, the

ambient light with wavelength within the “Ambient Light

Sensing” spectral response curve in Figure 8 is converted into

current. With ADC, the current is converted to an unsigned n-bit

(up to 16 bits) digital output.

2

(ADC). An I C command reads the ambient light or IR intensity in

counts.

The converter is a charge-balancing integrating type 16-bit ADC. The

chosen method for conversion is best for converting small current

signals in the presence of an AC periodic noise. A 100ms integration

time, for instance, highly rejects 50Hz and 60Hz power line noise

simultaneously. See “Integration and Conversion Time” on page 9.

When the part is programmed for infrared (IR) sensing, the IR

light with wavelength within the “IR Sensing” spectral response

curve in Figure 8 is converted into current. With ADC, the current

is converted to an unsigned n-bit (up to 16 bits) digital output.

The built-in ADC offers user flexibility in integration time or

conversion time. There are two timing modes: Internal Timing Mode

and External Timing Mode. In Internal Timing Mode, integration time

Interrupt Function

The active low interrupt pin is an open drain pull-down

configuration. The interrupt pin serves as an alarm or monitoring

function to determine whether the ambient light level exceeds

the upper threshold or goes below the lower threshold. Note that

the function of ADC conversion continues without stopping after

interrupt is asserted. If the user needs to read the ADC count that

triggers the interrupt, reading should be done before the data

registers are refreshed by subsequent conversions. The user can

also configure the persistency of the interrupt pin. This reduces

the possibility of false triggers, such as noise or sudden spikes in

ambient light conditions. An unexpected camera flash, for

example, can be ignored by setting the persistency to eight

integration cycles.

is determined by an internal oscillator (f

12, 16) counter inside the ADC. In External Timing Mode, integration

time is determined by the time between two consecutive I C

External Timing Mode commands. A good balance of integration

time and resolution (depending on application) is required for

optimal results.

) and the n-bit (n = 4, 8,

OSC

2

The ADC has I C programmable range select to dynamically

accommodate various lighting conditions. For very dim conditions,

the ADC can be configured at its lowest range (Range 1) in the

ambient light sensing.

Low-Power Operation

The ISL29033 initial operation is at the power-down mode after a

supply voltage is provided. The data registers contain the default

ALS Ranges Considerations

2

When measuring ALS counts higher than 30000 counts on

Range 1 of the 16-bit ADC, switch to Range 2 (change [1 to 0]

bits of Register 1 from 00 to 01), and re-measure the ALS counts

and other data to change to Range 3 and Range 4. This

recommendation pertains only to applications in which light

incident on the sensor is IR-heavy and is distorted by tinted glass

that increases the ratio of infrared to visible light.

value of 0. When the ISL29033 receives an I C command to do a

2

one-time measurement from an I C master, it starts ADC

conversion with light sensing. It goes to power-down mode

automatically after one conversion is finished and keeps the

conversion data available for the master to fetch anytime

afterwards. The ISL29033 continuously does ADC conversion

2

with light sensing if it receives an I C command of continuous

measurement. It continuously updates the data registers with

the latest conversion data. It goes to power-down mode after it

receives the I C command of power-down.

V

Power-up and Power Supply

DD

2

Considerations

Upon power-up, ensure a V slew rate of 0.5V/ms or greater.

DD

After power-up, or if the power supply temporarily deviates from

FN7656.2

February 25, 2013

6

ISL29033

specification (2.25V to 3.63V), the following step is

or the number of clock cycles in the previous integration period

(Figure 2).

recommended: write 0x00 to register 0x00. Wait a few seconds,

and then rewrite all registers to the desired values. A hardware

reset method can be used, if preferred, instead of writing to the

2

The ISL29033 I C interface slave address is internally hard-wired as

1000100. When 1000100x, with x as R or W, is sent after the Start

condition, the device compares the first 7 bits of this byte to its

address, and matches. Figure 3 shows a sample one-byte read, and

test registers. For this method, set V = 0V for 1 second or more,

DD

power backup at the required slew rate, and write the registers to

the desired values.

2

Figure 4 shows a sample one-byte write. The I C bus master

always drives the SCL (clock) line, while either the master or the

slave can drive the SDA (data) line. Every I C transaction begins

Power-Down

To put the ISL29033 into a power-down state, the user can set

[7 to 5] bits to 0 in Register 0. Or more simply, set all of

Register 0 to 0x00.

2

with the master asserting a start condition (SDA falling while SCL

remains high). The following byte is driven by the master and

includes the slave address and the read/write bit. The receiving

device is responsible for pulling SDA low during the

2

I C Interface

2

acknowledgement period. Every I C transaction ends with the

There are eight 8-bit registers available inside the ISL29033. The

two command registers define the operation of the device. The

command registers do not change until the registers are

overwritten. The two 8-bit data read-only registers are for the ADC

output. The data registers contain the ADC's latest digital output,

master asserting a stop condition (SDA rising while SCL remains

high).

2

For more information about the I C standard, please consult the

2

Philips™ I C specification documents.

2

FIGURE 2. I C TIMING DIAGRAM

2

I C DATA

START

DEVICE ADDRESS

A

9

REGISTER ADDRESS

DEVICE ADDRESS

A

DATA BYTE0

W

STOP START

2

I C SDA

IN

A6 A5 A4 A3 A2 A1 A0 W

SDA DRIVEN BY MASTER

R7 R6 R5 R4 R3 R2 R1 R0

SDA DRIVEN BY MASTER

A

9

A6 A5 A4 A3 A2 A1 A0

W

SDA DRIVEN BY ISL29033

2

I C SDA

OUT

SDA DRIVEN BY MASTER

A D7 D6 D5 D4 D3 D2 D1 D0

2

I C CLK

9

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

2

FIGURE 3. I C READ TIMING DIAGRAM SAMPLE

FN7656.2

February 25, 2013

7

ISL29033

2

I C DATA

START

DEVICE ADDRESS

W

A

REGISTER ADDRESS

A

FUNCTIONS

A

STOP

2

I C SDA IN

A6 A5 A4 A3 A2 A1 A0

SDA DRIVEN BY MASTER

R7 R6 R5 R4 R3 R2 R1 R0

SDA DRIVEN BY MASTER

A

B7 B6 B5 B4 B3 B2 B1 B0

SDA DRIVEN BY MASTER

2

I C SDA OUT

A

9

A

2

I C CLK IN

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

2

FIGURE 4. I C WRITE TIMING DIAGRAM SAMPLE

TABLE 1. REGISTER SET

BIT

ADDR

00h

01h

02h

03h

04h

05h

06h

07h

REG NAME

COMMANDI

COMMANDII

7

6

5

4

0

3

2

1

0

DEFAULT

00h

OP2

0

OP1

0

OP0

0

FLAG

RES0

D2

PRST1

RANGE1

D1

PRST0

0

RES1

D3

RANGE0

D0

00h

DATA

D7

D6

D5

D4

00h

LSB

DATA

D15

TL7

D14

TL6

TL14

TH6

TH14

D13

TL5

TL13

TH5

TH13

D12

TL4

TL12

TH4

TH12

D11

TL3

TL11

TH3

TH11

D10

TL2

D9

D8

00h

MSB

INT_LT_LSB

INT_LT_MSB

INT_HT_LSB

INT_HT_MSB

TL1

TL0

00h

TL15

TH7

TL10

TH2

TH10

TL9

TL8

00h

TH1

TH0

TH8

FFh

TH15

TH9

FFh

TABLE 2. OPERATION MODE

OPERATION

Register Set

There are eight registers available in the ISL29033. Table 1

summarizes their functions.

BITS 7 TO 5

000

Power-down the device

Reserved (Do not use)

ALS continuous

Command Register I 00 (Hex)

The first command register has the following functions:

001

010

1. Operation Mode: Bits 7, 6, and 5. These three bits determine

the operation mode of the device (Table 2). Interrupt flag:

Bit 2. This is the status bit of the interrupt (Table 3). The bit is

set to logic high when the interrupt thresholds have been

triggered (out of threshold window), and to logic low when not

yet triggered. When activated and the interrupt is triggered,

the INT pin goes low, and the interrupt status bit goes high

100

101

110

IR continuous

111

Reserved (Do not use)

TABLE 3. INTERRUPT FLAG

OPERATION

2

until the status bit is polled through the I C read command.

BIT 2

Both the INT output and the interrupt status bit are

automatically cleared at the end of the 8-bit (00h) command

register transfer.

0

1

Interrupt is cleared or not triggered yet

Interrupt is triggered

FN7656.2

February 25, 2013

8

ISL29033

2. Interrupt Persist: Bits 1 and 0. The interrupt pin and the

TABLE 7. DATA REGISTERS

CONTENTS

interrupt flag are triggered or set when the data sensor

reading is out of the interrupt threshold window after m

consecutive number of integration cycles (Table 4). The

interrupt persist bits determine m.

ADDRESS

(HEX)

02

D0 is LSB for 4-, 8-, 12- or 16-bit resolution; D3 is MSB for

4-bit resolution; D7 is MSB for 8-bit resolution

TABLE 4. INTERRUPT PERSIST

03

D15 is MSB for 16-bit resolution; D11 is MSB for 12-bit

resolution

BIT 1:0

00

NUMBER OF INTEGRATION CYCLES

1

4

Interrupt Registers (04, 05, 06 and 07 Hex)

01

Registers 04 and 05 hex set the low (LO) threshold for the

interrupt pin and the interrupt flag. Register 04 hex is the LSB,

and Register 05 hex is the MSB. By default, the interrupt

threshold LO is 00 hex for both LSB and MSB.

10

8

11

16

Command Register II 01 (Hex)

The second command register has the following functions:

Registers 06 and 07 hex set the high (HI) threshold for the

interrupt pin and the interrupt flag. Register 06 hex is the LSB,

and Register 07 hex is the MSB. By default, the interrupt

threshold HI is FF hex for both LSB and MSB.

1. Resolution: Bits 3 and 2. Bits 3 and 2 determine the ADC

resolution and the number of clock cycles per conversion

(Table 5). Changing the number of clock cycles does more than

just change the resolution of the device; it also changes the

integration time, which is the period during which the

analog-to-digital (A/D) converter samples the photodiode

current signal for a measurement.

Calculating Lux

The ISL29033 ADC output codes, DATA, are directly proportional

to lux in ambient light sensing, as shown in Equation 1.

E

= α × DATA

(EQ. 1)

cal

TABLE 5. ADC RESOLUTION DATA WIDTH

In this equation, E is the calculated lux reading. The constant,

cal

a, is determined by the full scale range and the ADC maximum

output counts. The constant is independent of the light sources

(fluorescent, incandescent and sunlight) because the light source

IR component is removed during the light signal process. The

constant can also be viewed as the sensitivity (the smallest lux

measurement the device can measure), as shown in Equation 2.

BITS 3:2

00

NUMBER OF CLOCK CYCLES

n-BIT ADC

16

2

= 65,536

= 4,096

16

12

8

12

8

01

10

= 256

= 16

4

11

4

Range(k)

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

α =

(EQ. 2)

Count

max

2. Range: Bits 1 and 0. The Full Scale Range (FSR) can be

2

In this equation, Range(k) is as defined in Table 6. Count

the maximum output counts from the ADC.

is

max

adjusted through the I C by using Bits 1 and 0. Table 6 lists

the possible values of FSR for the 499kΩ R

resistor.

EXT

The transfer function used for n-bits ADC is as shown in

Equation 3:

TABLE 6. RANGE/FSR LUX

BITS 1:0

00

k

1

2

3

4

RANGE(k)

Range1

Range2

Range3

Range4

FSR (LUX) @ ALS SENSING

Range(k)

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

E

=

× DATA

(EQ. 3)

cal

n

125

500

2

01

In this equation, n = 4, 8, 12 or 16 and is the number of ADC bits

n

programmed in the command register. The number 2

10

2,000

8,000

represents the maximum number of counts possible from the

ADC output. Data is the ADC output stored in data

Registers 02 hex and 03 hex.

11

Data Registers (02 Hex and 03 Hex)

Integration and Conversion Time

The device has two 8-bit read-only registers to hold the data from

LSB to MSB for the ADC (Table 7). The most significant bit (MSB)

is accessed at 03 hex, and the least significant bit (LSB) is

accessed at 02 hex. For 16-bit resolution, the data is from D0 to

D15; for 12-bit resolution, the data is from D0 to D11; for 8-bit

resolution, the data is from D0 to D7. The registers are refreshed

after every conversion cycle.

ADC resolution and f

determine the integration time, t , as

int

OSC

shown in Equation 4.

R

n

1

EXT

(EQ. 4)

-----------

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

t

= 2

×

= 2

×

int

f

655kHz × 499kΩ

OSC

In this equation, n is the number of bits of resolution, and n = 4,

n

8, 12 or 16. Therefore, 2 is the number of clock cycles. The

value of n can be programmed at the command register, Register

01 (hex), Bits 3 and 2 (Table 8).

FN7656.2

February 25, 2013

9

ISL29033

TABLE 8. INTEGRATION TIME OF n-BIT ADC

Typical Circuit

A typical application for the ISL29033 is shown in Figure 5. The

R

(kΩ)

n = 16-BIT

(ms)

n = 12-BIT

(ms)

n = 8-BIT

(µs)

n = 4-BIT

(µs)

EXT

2

ISL29033 I C address is internally hardwired as 1000100. The

2

device can be tied onto a system’s I C bus together with other

499

100

200

6.25

12.5

391

782

24

48

2

I C compliant devices.

1000

Soldering Considerations

External Scaling Resistor R

Range

for f

and

EXT

OSC

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; it is

qualified to +260°C. A standard reflow soldering profile with a

+260°C maximum is recommended.

The ISL29033 uses an external resistor, R , to fix its internal

EXT

oscillator frequency, f

The f

, and the light sensing range, Range.

OSC

and Range are inversely proportional to R . For ease

OSC

of use, the proportionality constant is referenced to 499kΩ.

EXT

ALS Sensor Window Layout

Calculation for Range is shown in Equation 5 and for f

Equation 6.

in

OSC

Special care should be taken to ensure that the sensor, as shown

in the sensor location outline (Figure 6), is uniformly illuminated.

Shadows from off-angle window openings can affect uniform

illumination, which in turn can affect measurement results.

(EQ. 5)

499kΩ

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

Range =

× Range(k)

R

EXT

(EQ. 6)

499kΩ

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

f

=

× 655kHz

OSC

R

EXT

Noise Rejection

In general, integrating-type ADCs have excellent noise rejection

characteristics for periodic noise sources for which frequency is

an integer multiple of the conversion rate. For example, a 60Hz

AC unwanted signal’s sum from 0ms to k*16.66ms (k = 1,2...k )

i

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.

ADC Output in IR Sensing

The ISL29033 ADC output codes, DATA, are directly proportional

to the IR intensity received in IR sensing, as shown in Equation 7.

DATA = β × E

(EQ. 7)

IR

In this equation, E is the received IR intensity. The constant, b,

IR

changes with the spectrum of background IR noise, such as

sunlight and incandescent light. The constant, b, also changes

with ADC range and resolution selections.

Suggested PCB Footprint

It is important that users check Tech Brief 477, “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 ISL29033 is relatively insensitive to layout. Like other I C

2

devices, it is intended to provide excellent performance even in

significantly noisy environments. Attention to a few

considerations will ensure best performance.

2

Route the supply and I C traces as far as possible from all

sources of noise. Use two power-supply decoupling capacitors,

1µF and 0.1µF, placed close to the device.

FN7656.2

February 25, 2013

10

ISL29033

1.7V TO 3.63V

2

I C MASTER

R3

RES1

R1

10k

R2

10k

MICROCONTROLLER

SDA

SCL

INT

2.25V TO 3.63V

2

I C SLAVE_0

I C SLAVE_1

SDA

I C SLAVE_n

1

2

6

5

4

SDA

VDD

SDA

SCL

INT

SCL

GND

C1

1µF

C2

0.1µF

3

REXT

ISL29033

R

EXT

499kΩ

FIGURE 5. ISL29033 TYPICAL CIRCUIT

6

1

5

2

0.40

0.54

4

3

0.37

FIGURE 6. 6 LD ODFN SENSOR LOCATION OUTLINE

FN7656.2

February 25, 2013

11

ISL29033

Typical Performance Curves

V

= 3.0V, R

= 499kΩ

EXT

DD

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

HUMAN EYE

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

FLUORESCENT

IR SENSING

ALS

HALOGEN

INCANDESCENT

SUN

300

400

500

600

700

800

900 1000 1100

350

550

750

950

WAVELENGTH (nm)

FIGURE 7. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED

BY LUMINOUS INTENSITY (LUX)

FIGURE 8. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT

LIGHT SENSING

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

5

4

3

2

MAX

1

0

-1

MIN

-2

-3

-4

-5

-90 -75 -60 -45 -30 -15

0

15 30 45 60 75 90

0

20

40

60

80

100

120

ANGULAR OFFSET (°)

LUX METER (LUX)

FIGURE 10. LINEARITY OVER RANGE 1

FIGURE 9. ANGULAR SENSITIVITY

20

18

16

14

12

10

8

70000

60000

50000

40000

30000

20000

10000

0

FLUORESCENT LIGHT

500kΩ

HALOGEN

INCANDESCENT LIGHT

6

4

2

0

10

20

30

40

50

60

70

80

90 100

0

0.005

0.01

0.015

0.02

LUX READING (LUX)

LUX METER (LUX)

FIGURE 11. LOW LUX AT GREEN LED (500kΩ)

FIGURE 12. LIGHT SOURCES AT RANGE 1, 500kΩ R

EXT

FN7656.2

February 25, 2013

12

ISL29033

Typical Performance Curves

V

= 3.0V, R

= 499kΩ (Continued)

EXT

DD

10

8

45

40

35

30

25

20

15

10

5

6

4

2

500k, 30LUX NORMALIZED

0

-2

1MΩ

-4

-6

-8

-10

-60

0

-40

-20

0

20

40

60

80

100

0

0.005

0.010

0.015

0.020

TEMPERATURE (°C)

LUX METER (LUX)

FIGURE 13. 500kΩ ALS COUNT, 30 LUX NORMALIZED

FIGURE 14. LOW LUX AT GREEN LED (1MΩ)

70000

10

8

6

FLUORESCENT LIGHT

60000

50000

40000

4

2

1M, 20 LUX NORMALIZED

0

HALOGEN

30000

-2

-4

-6

-8

-10

20000

10000

0

INCANDESCENT LIGHT

0

10

20

30

40

50

-60

-40

-20

0

20

40

60

80

100

LUX READING (LUX)

TEMPERATURE (°C)

FIGURE 15. LIGHT SOURCES AT RANGE 1, 1MΩ R

FIGURE 16. 1MΩ ALS COUNTS, 30 LUX NORMALIZED

EXT

90

80

70

60

50

40

30

20

10

500kΩ

1MΩ

0

2.25

2.75

3.25

3.75

V

(V)

DD

FIGURE 17. SUPPLY CURRENT vs V ALS SENSING

DD

FN7656.2

February 25, 2013

13

ISL29033

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

FN7656.2

FN7656.1

CHANGE

September 26, 2012

September 21, 2011

Corrected horizontal axis in Figure 9, “ANGULAR SENSITIVITY,” on page 12 from 0 to 40 to -90 to 90.

Changed Title on page 1 from “Integrated Digital Ambient Light Sensor with Interrupt Function” to “Ultra-Low

Lux, Low Power, Integrated Digital Ambient Light Sensor with Interrupt Function”

August 25, 2011

FN7656.0

Initial Release

About Intersil

Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management

semiconductors. The company's products address some of the largest markets within the industrial and infrastructure, personal

computing and high-end consumer markets. For more information about Intersil, visit our website at www.intersil.com.

For the most updated datasheet, application notes, related documentation and related parts, please see the respective product

information page found at www.intersil.com. You may report errors or suggestions for improving this datasheet by visiting

www.intersil.com/en/support/ask-an-expert.html. Reliability reports are also available from our website at

http://www.intersil.com/en/support/qualandreliability.html#reliability

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

Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted

in the quality certifications found at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time

without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be

accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third

parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com

FN7656.2

February 25, 2013

14

ISL29033

Package Outline Drawing

L6.2x2.1

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

Rev 3, 5/11

2.10

A

6

B

PIN #1

INDEX AREA

6

1

PIN 1

INDEX AREA

0.65

1.35 1.30 REF

2.00

4

6X 0.30±0.05

(4X)

0.10

0.10 M C A B

0.65

TOP VIEW

6x0.35 ± 0.05

BOTTOM VIEW

2.50

2.10

PACKAGE

OUTLINE

SEE DETAIL "X"

0.10 C

0.65

(4x0.65)

MAX 0.75

C

BASE PLANE

SEATING PLANE

0.08 C

SIDE VIEW

(1.35)

5

C

(6x0.30)

0 . 2 REF

(6x0.20)

0 . 00 MIN.

0 . 05 MAX.

(6x0.55)

TYPICAL RECOMMENDED LAND PATTERN

DETAIL "X"

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 0.15mm and 0.30mm from the terminal tip.

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

5.

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.

FN7656.2

February 25, 2013

15


型号：	ISL29033IROZ-EVALZ
厂家：	Intersil
描述：	Ultra-Low Lux, Low Power, Integrated Digital Ambient Light Sensor with Interrupt Function
文件：	总15页 (文件大小：465K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ISL29033IROZ-EVALZ [INTERSIL]

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