ISL29000IROZ - Intersil - Datasheet.Directory

FN6117.6

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

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ISL29000

Ambient Light Photo Detect IC

The ISL29000 is a light-to-current optical sensor combining

a photodiode and a current ampli fier on a single monolithic

IC. Output current is directly proportionate t o the light

intensity on the photodiode. Its sensitivity is superior to that

of a phototransistor and exhibits little variation. Its spectral

sensitivity matches closely to the luminous efficiency and

linearity.

Housed in an ultra-compact surface mount clear plastic

package, this device is excellent for power saving control

function in cell phones, PDAs, and other handheld

applications.

Pinout ISL29000

(5 LD ODFN)

TOP VIEW

Features

• Monolithic IC containing photodiode and amplifier

• Converts light intensity to current

• 2.5V to 5.5V supply range

• Low supply current: 1µA

• Excellent output linearity of luminance

• Ultra-compact and light surface mount package

• Pb-free (RoHS compliant)

Applications

• Mobile phones

• Notebook PCs

•PDAs

• Video cameras

• Digital cameras

VCC

GND

OUTPUT

THERMAL

PAD

*THERMAL PAD CAN BE CONNECTED TO GND OR

ELECTRICALLY ISOLATED

Ordering Information

PART NUMBER

(Note) TEMP RANGE

(°C) PACKAGE

(Pb-Free) PKG.

DWG. #

ISL29000IROZ-T7* -40 to +85 5 Ld ODFN

Tape and Reel L5.2X2.1

ISL29000IROZ-EVALZ Evaluation Board

*Please refer to TB347 for details on reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach

materials and 100% matte tin plate - e3 termination finish, which is

RoHS compliant and compatible with both SnPb and Pb-free

soldering operations. Intersil Pb-free prod ucts are MSL classified at

Pb-free peak reflow temperatures that meet or exceed the Pb-free

requirements of IPC/JEDEC J STD-020.

Data Sheet September 2, 2008

2FN6117.6

September 2, 2008

FIGURE 1. RISE/FALL TIME MEASUREMENT FIGURE 2. RISE/FALL TIME MEASUREMENT WAVEFORMS

Absolute Maximum Ratings (TA = +25°C) Thermal Information

Supply Voltage between VSD and GND . . . . . . . . . . . . . . . . . . . .6V

Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . . 6mA

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

Thermal Resistance θJA (°C/W)

ODFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .+90°C

Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-40°C to +100°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.

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests

are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA

Electrical Specifications VCC = 3V, TA = +25°C, unless otherwise specified.

PARAMETER DESCRIPTION CONDITION MIN TYP MAX UNIT

ICC Supply Current RL = 1kΩ, EV = 1000 lux 74 µA

EV = 0 0.2 µA

IL1 Light Current EV = 1000 lux 45 61 75 µA

IL2 Light Current EV = 100 lux 6.5 µA

ILEAK Dark Current EV = 0 0.06 µA

VO(MAX) Maximum Output Compliance Voltage At 95% of normal output current,

EV = 1000 lux 2.7 V

tRRise Time (Note 1) RL = 5kΩ, EV = 1000 lux 27 µs

tFFall Time (Note 1) RL = 5kΩ, EV = 1000 lux 78 µs

tDDelay Time for Rising Edge (Note 1) RL = 5kΩ, EV = 1000 lux 80 µs

tSDelay Time for Falling Edge (Note 1) RL = 5kΩ, EV = 1000 lux 35 µs

VLO Maximum Voltage at EN Pin to Enable 0.6 V

VHI Minimum Voltage at EN Pin to Disable 1.8 V

NOTE:

1. Switching time measurement is based on Figures 1 and 2.

2. Fluorescent light is substituted by Green LED during production.

ISL29000

PULSE

DRIVE

VCC

VOUT

CH1

CH2

PULSE DRIVE

VOUT

80%

20%

100µs

0.1V

VS = 3V

tA = +27°C

ISL29000

3FN6117.6

September 2, 2008

Typical Performance Curves

FIGURE 3. SPECTRAL RESPONSE FIGURE 4. SENSITIVITY

FIGURE 5. DARK CURRENT vs TEMPERATURE FIGURE 6. GAIN vs TEMPERATURE

FIGURE 7. OUTPUT COMPLIANCE VOLTAGE vs CURRENT FIGURE 8. IOUT vs LUMINANCE

100

400 500 600 700 800 900 1k

WAVE LENGTH (nm)

RELATIVE RESPONSE (%)

ISL29000 RELATIVE RESPONSE

ISL29000 RELATIVE

RESPONSE WITH IR

GLASS FILTER

ILLUMINATION (LX)

OUTPUT CURRENT (µA)

0 200 400 600 800 1000

VCC = 3V

FLUORESCENT LIGHT

TEMPERATUR E (°C)

OUTPUT CURRENT - NO LIGHT (µA)

0.20

0.18

0.14

0.10

0.16

0.12

-60 -40 0 40 80 100-20 20 60

VDD = 3V

TEMPERATUR E (°C)

GAIN/GAIN (+25°C)

1.20

1.15

0.95

0.80

1.05

0.85

-60 -40 0 40 80 100-20 20 60

1.10

0.90

1.00

VDD = 3V

FLUORESCENT LIGHT OF 500 LUX

OUTPUT CURRENT (µA)

OUTPUT COMPLIANCE VOLTAGE

(VDD -V

OUT) (V)

0.6

0.5

0.2

0.3

0.1

-200 0 400 800 1000 1200200 600

VDD = 3V

TA = +27°C

0.4

100

200

300

400

500

600

700

800

0 5k 10k 15k 20k

ILLUMINANCE (lux)

IOUT (µA)

FLUORESCENT

LIGHT SOURCE

ISL29000

4FN6117.6

September 2, 2008

Block Diagram

Application Information

Product Descr iption

The ISL29000 is a light-to-current optical sensor combining

photodiodes and current amplifiers on a single monolithic IC.

The photodiodes are temperature-compensated and their

spectrum resembles the human eye response. The output

current is directly proportional to the intensity of light falling

on the photodiodes. For 100 lux of input fluorescent light, the

ISL29000 has an output curren t of 6.5µA.

The ISL29000 is housed in an ultra-compact surface mount

clear plastic package.

Light-to-Current and Voltage Conversion

The ISL29000 has a responsiveness that is directly

proportional to the intensity of light intercep ted by the

photodiodes. Although the conversion rate varies depending

on the light sources (fluorescent light, incandescent light or

direct sunlight), in general for a fluorescent light, the

light-to-current conversion is:

Here, IOUT is the output current in µA, and LINPUT is the

input light in lux.

For some applications, a load resistor is added between the

output and the ground as shown in Figure 1. The output

voltage can be expressed in Equation 2:

Here, VOUT is the output voltage and RLOAD is the value of

the load resistor added. T he compliance of the ISL29000's

output circuit may result in premature saturation of the

output current and voltage when an excessively large

RLOAD is used. The output compliance voltage is 300mV

below the supply voltage as listed in VO(MAX) of “Electrical

Specifications” on page 2.

In order to have the linear relationship between the input

light and the output current and voltage, a proper resistor

value (i.e., gain) should be picked for a specific input light

range. The resistor value can be picked according to

Equation page 4:

Here, VSUP is the supply voltage, and LRANGE is the

specific input light range for an application. For example, an

indoor light ranges typically from 0 lux to 1,000 lux. A resistor

value of 45kΩ for 3V supply voltage can be used. For a small

light range, a large resistor value should be used to achieve

better sensitivity; for a large light range, a small resistor

value should be used to prevent no n-linear output current

and voltage.

Resistor Output RLOAD Selection

The resistor output, RLOAD, determines the voltage transfer

function of the device. The device converts light into current

then RLOAD converts the output current to an output voltage.

RLOAD can range from 10Ω to 10MΩ depending on the input

lux levels. The table below lists RLOAD values to maximize

output swing for typical lux range levels. A careful balance of

dynamic swing and fast response has to be considered

when choosing RLOAD. For faster response, choose a

smaller value RLOAD to shunt stray capacitances that may

slow down response time. Fo r maximum dynamic range or

swing, choose a higher value RLOAD. Although finite, the

output impedance of the devi ce is con siderably large.

Hence, the light-to-current conversion deviation because of

resistor loading is infinitesimal. The recommended maximum

RLOAD is 10MΩ.

Although the device saturates at 10,000 lux (IOUT = 600µA),

the output current must never exceed 6mA. T he voltage

output compliance of the device is 300mV below the supply.

The output current stops ramping when the output voltage

reaches voltage compliance.

Pin Descriptions

PIN NAME DESCRIPTION

1 VCC Supply, 2.5V to 5.5V

2 GND Ground

3EN

Enable

4 NC No connect

5 Output Current output pin

ENABLE

OUTPUT

GND

VCC

IOUT 61μA

1000Lux

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

⎝⎠

⎛⎞

LINPUT

×=(EQ. 1)

VOUT IOUT RLOAD

×61μA

1000Lux

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

⎝⎠

⎛⎞

LINPUT RLOAD

××==

(EQ. 2)

RLOAD VSUP 0.3V–()

·μA

---------------------------------------1000Lux

LRANGE

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

×=

(EQ. 3)

ISL29000

5FN6117.6

September 2, 2008

Application Examples

The following examples present fro m fully automatic to fully

manual override implementations. These guidelines are

applicable to a wide variety of potential light control

applications. The ISL2900 0 can be used to control the

brightness input of CCFL inverters. Likewise it can interface

well with LED drivers. In each specific application, it is

important to recognize the target environment and its

ambient light conditions. The mechanical mounti ng of the

sensor, light aperture hole size and use of a light pipe or

bezel are critical in determining the response of the

ISL29000 for a given exposure of light.

The example in Figure 9 shows a fully automatic dimming

solution with no user interaction. Choose R1 and R2 values

for any desired minimum brightness and slope. Choose C1

to adjust response time and to filter 50/60 Hz room lighting .

For example, suppose you wish to generate an output

voltage from 0.25V to 1.25V to drive the input of an LED

driver controller. The 0.25V represents the minimum LED

brightness and 1.25V represents the maximum. The 1st step

would be to determine the ratio of R1 and R2:

Next, the value of R2 can be calculated based on the

maximum output current coming from the ISL29000 under

the application's maximum light exposure. Suppose the

current has been determined to be about 125µA. Thus, R2

can be calculated approximately using Equations 5 and 6:

and

In Figure 10, user adjustable bias control has been added to

allow control over the minimum and maximum output

voltage. This allows the user to adjust the output brightness

to personal preference over a limit range via the 3V PWM

control.

Figure 11 shows how a fully manual override can be quickly

added by using the EN pin.

TABL E 1. VDD = 5V, MAXIMUM OUTPUT VOLTAGE = 4.7V

ILLUMINA TION RANGE

(LUX) RLOAD

(kΩ)CURRENT OUT

(µA)

0 to 10 7830 0 to 0.6

0 to 200 392 0 to 12

0 to 500 157 0 to 30

0 to 1,000 80 0 to 60

0 to 10,000 8.00 0 to 600

R1R23.0V

0.25V

----------------1–

⎝⎠

⎛⎞

×11 R2

×== (EQ. 4)

3V TO 5V

SUPPLY VOLTAGE 3V DC VOLTAGE

ISL29000OUTEN

GND

VDO

FIGURE 9. AUTOMATIC DIMMING SOLUTION

10k 25µF

110k

TO INVERTER BRIGHTNESS

INPUT OR LED DRIVER

CONTROLLER

R21.25V

125μA

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

⎝⎠

⎛⎞

10kΩ== (EQ. 5)

R111 R2

×110kΩ== (EQ. 6)

3V TO 5V

SUPPLY VOLTAGE 3V PWM CONTROL

ISL29000OUTEN

GND

VDO

FIGURE 10. AUTOMA TIC DIMMING SOLUTION WITH

ADJUSTABLE BIAS CONTROL

10k 25µF

110k

TO INVERTER BRIGHTNESS

INPUT OR LED DRIVER

CONTROLLER

3V TO 5V

SUPPLY VOLTAGE 3 V PWM CONTROL

ISL29000OUTEN

GND

VDO

FIGURE 1 1. AUTOMA TIC DIMMING SOLUTION WITH

ADJUSTABLE BIAS CONTROL AND MANUAL

OVERRIDE

ENABLE/

CONTROL

DISABLE

10k 25µF

110k TO INVERTER

BRIGHTNESS

INPUT OR LED

DRIVER

CONTROLLER

ISL29000

All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certifications can be viewed 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 lice nse is gran t ed by i mpli catio n or other wise u nder an y p a tent or patent right s of Int ersi l or it s sub sidi aries.

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

FN6117.6

September 2, 2008

Short Circuit Current Limit

The ISL29000 does not limit the output short circuit current.

If the output is directly shorted to the ground continuously,

the output current could easily increase for a strong input

light such that the device may be damaged. Maximum

reliability is maintained if the output continuous current never

exceeds 6mA by adding a load resistor at the output. This

limit is set by the design of the internal metal interconnects.

Suggested PCB Foo tp rin t

Footprint pads should be a nominal 1-to-1 correspondence

with package p ads. The large, exposed central die-mounting

paddle in the center of the package requires neither thermal

nor electrical connections to PCB, and such connections

should be avoided.

Power Supply Bypassing and Printed Circuit

Board Layout

The ISL29000 is relatively insensitive to the printed circuit

board layout due to its low speed operation. Nevertheless,

good printed circuit board layout is necessary for optimum

performance. Ground plane construction is highly

recommended, lead length should be as short as possible

and the power supply pins must be well bypassed to reduce

the risk of oscillation. For normal single supply operation,

where the GND pin is connected to ground, a 0.1µF ceramic

capacitor should be placed from VCC pin to GND pin. A

4.7µF tantalum capacitor should then be connected in

parallel, placed close to the device.

ISL29000

7FN6117.6

September 2, 2008

ISL29000

Package Outline Drawing

L5.2x2.1

5 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE

Rev 1, 05/08

located within the zone indicated. The pin #1 identifier 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 0.15mm and 0.30mm from the terminal tip.

Dimension b applies to the metallized terminal and is measured

Dimensions in ( ) for Reference Only.

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

either a mold or mark feature.

Dimensions are in millimeters.1.

NOTES:

BOTTOM VIEW

DETAIL "X"

SIDE VIEW

TYPICAL RECOMMENDED LAND PATTERN

TOP VIEW

(4X) 0.10

INDEX AREA

PIN 1

2.10

2.00

PIN #1 INDEX AREA

5X 0 . 35 ± 0 . 05 B0.10 MAC

SEATING PLANE

BASE PLANE

0.08

0.10

SEE DETAIL "X"

0 . 00 MIN.

0 . 05 MAX.

0 . 2 REF

( 5X 0 . 30 )

( 5X 0 . 55 )

(0.65)

(1.95)

(0.65)

(1.35)

0.65

1.35 1.30 REF

0.65

0.30±0.05

0 . 7 ± 0 . 05