ISL29003IROZ-T7 datasheet(10/15 Pages) INTERSIL

Part #	ISL29003IROZ-T7

Description	Light-to-Digital Output Sensor with High Sensitivity, Gain Selection, Interrupt Function and I2C Interface

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Manufacturer	INTERSIL [Intersil Corporation]

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10 / 15 page

10

FN7464.3

October 8, 2007

Solution 2 - Using External Timing Mode

From solution 1, the desired integration time is 100ms. Note

that the REXT resistor only determines the inter oscillator

frequency when using external timing mode. Instead the

integration time is the time between two sync_iic commands

sent through the I2C. The programmer determines how

many I2C clock cycles to wait between two external timing

commands.

iI2C = fI2C*tint = number of I

2C clock cycles

iI2C = 10kHz *100ms

iI2C = 1,000 I

2C clock cycles. An external sync_iic command

sent 1,000 cycles after another sync_iic command rejects

both 60Hz and 50Hz AC noise signals.

Next is to pick an arbitrary REXT = 100kΩ and to choose the

Gain/Range Mode. For a maximum 500 lux, Range1 is

adequate. From Equation 3:

The effective transfer function becomes:

DATA is the sensor reading data located in data registers

04(hex) and 05(hex)

COUNTER is the timer counter value data located in data

registers 06(hex) and 07(hex). In this sample problem,

COUNTER = 1000.

IR Rejection

Any filament type light source has a high presence of infrared

component invisible to the human eye. A white fluorescent

lamp, on the other hand has a low IR content. As a result,

output sensitivity may vary depending on the light source.

Maximum attenuation of IR can be achieved by properly

scaling the readings of Diode1 and Diode2. The user obtains

data reading from sensor Diode 1, D1, which is sensitive to

visible and IR, then reading from sensor Diode 2, D2 which is

mostly sensitive from IR. The graph on Figure 8 shows the

effective spectral response after applying Equation 14 of the

ISL29003 from 400nm to 1000nm. Equation 14 describes the

method of cancelling IR in internal timing mode.

Where:

data = lux amount in number of counts less IR presence

D1 = data reading of Diode 1

D2 = data reading of Diode 2

n = 1.85. This is a fudge factor to scale back the sensitivity

up to ensure Equation 4 is valid.

k = 7.5. This is a scaling factor for the IR sensitive Diode 2.

Flat Window Lens Design

A window lens will surely limit the viewing angle of the

ISL29003. The window lens should be placed directly on top

of the device. The thickness of the lens should be kept at

minimum to minimize loss of power due to reflection and

also to minimize loss of loss due to absorption of energy in

the plastic material. A thickness of t = 1mm is recommended

for a window lens design. The bigger the diameter of the

window lens, the wider the viewing angle is of the ISL29003.

Table 16 shows the recommended dimensions of the optical

window to ensure both 35° and 45° viewing angle. These

dimensions are based on a window lens thickness of 1.0mm

and a refractive index of 1.59.

TABLE 14. SOLUTION1 SUMMARY TO EXAMPLE DESIGN

PROBLEM

DESIGN PARAMETER

VALUE

tint

100ms

REXT

50k

Ω

Gain/Range Mode

Range1 = 1000 lux

FSR

2000 lux

# of clock cycles

216

Transfer Function

TABLE 15. SOLUTION2 SUMMARY TO EXAMPLE DESIGN

PROBLEM

DESIGN PARAMETER

VALUE

tint

100ms

REXT

100k

Ω

Gain/Range Mode

Range1 = 1000 lux

FSR

1000 lux

# of clock cycles

COUNTER = 1000

Transfer Function

E

DATA

2

16

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

2000 lux

×

=

FSR

1000 lux

100k

Ω

100k

Ω

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

=

FSR

1000 lux

=

E

DATA

COUNTER

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

1000 lux

×

=

E

DATA

COUNTER

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

1000 lux

×

=

D3

n D1

kD2

–

()

=

(EQ. 14)

DLENS

∅

t

D1

DTOTAL

∅ = Viewing angle

WINDOW LENS

ISL29003

FIGURE 4. FLAT WINDOW LENS

ISL29003

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