ISL29010 datasheet(8/14 Pages) INTERSIL

No de pièce	ISL29010

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

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Fabricant	INTERSIL [Intersil Corporation]

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8

FN6414.0

February 13, 2008

INTEGRATION TIME IN EXTERNAL TIMING MODE

This timing mode is programmed in the command register

00(hex) Bit 5. External Timing Mode is recommended when

integration time can be synchronized to an external signal

such as a PWM to eliminate noise.

To read the light count DATA output, the device needs three

sync_I2C commands to complete one measurement. The 1st

sync_I2C command starts the conversion of the diode array 1.

The 2nd sync_I2C completes the conversion of diode array 1

and starts the conversion of diode array 2. The 3rd sync_I2C

pules ends the conversion of diode array 2, outputs the light

count DATA, and starts over again to commence conversion

of diode array 1.

The integration time, tINT, is the sum of two identical time

intervals between the three sync pulses. tINT is determined

by Equation 12:

where kOSC is the number of internal clock cycles obtained

from Timer data register and fOSC is the internal I

2C

operating frequency.

The internal oscillator, fOSC, operates identically in both the

internal and external timing modes, with the same

dependence on REXT. However, in External Timing Mode,

the number of clock cycles per integration is no longer fixed

at 2n. The number of clock cycles varies with the chosen

integration time, and is limited to 216 = 65,536. In order to

avoid erroneous lux readings the integration time must be

short enough not to allow an overflow in the counter register.

fOSC = 327kHz*100kΩ/REXT. When Range/Gain is set to

Range1 or Range2.

fOSC = 655kHz*100kΩ/REXT. When Range/Gain is set to

Range3 or Range4.

Noise Rejection

In general, integrating type ADC’s have excellent

noise-rejection characteristics for periodic noise sources

whose frequency is an integer multiple of the integration

time. 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.

Flat Window Lens Design

A window lens will surely limit the viewing angle of the

ISL29010. 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 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 ISL29010.

Table 12 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.

Window with Light Guide Design

If a smaller window is desired while maintaining a wide

effective viewing angle of the ISL29010, a cylindrical piece of

transparent plastic is needed to trap the light and then focus

and guide the light on to the device. Hence the name light

guide which is also known as light pipe. The pipe should be

placed directly on top of the device with a distance of

D1 = 0.5mm to achieve peak performance. The light pipe

should be a minimum of 1.5mm in diameter to ensure that

whole area of the sensor will be exposed. See Figure 5.

t

INT

k

OSC

f

OSC

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

=

(EQ. 12)

t

INT

65,535

f

OSC

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

<

(EQ. 13)

TABLE 12. RECOMMENDED DIMENSIONS FOR A FLAT

WINDOW DESIGN

DTOTAL

D1

DLENS @ 35

VIEWING ANGLE

DLENS @ 45

VIEWING ANGLE

1.5

0.50

2.25

3.75

2.0

1.00

3.00

4.75

2.5

1.50

3.75

5.75

3.0

2.00

4.30

6.75

3.5

2.50

5.00

7.75

t = 1

Thickness of lens

D1

Distance between ISL29010 and inner edge of lens

DLENS

Diameter of lens

DTOTAL

Distance constraint between the ISL29010 and lens

outer edge

* All dimensions are in mm.

DLENS

∅

t

D1

DTOTAL

∅ = VIEWING ANGLE

WINDOW LENS

ISL29013

FIGURE 4. FLAT WINDOW LENS

E =

DATA

215

x 2000

ISL29010

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