VL6524 datasheet(56/70 Pages) STMICROELECTRONICS

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Optical specifications

VL6524/VS6524

56/70

Optical specifications

12.1

Average sensitivity

The average sensitivity is a measure of the image sensor response to a given light stimulus.

The optical stimulus is a white light source with a color temperature of 3200K, producing

uniform illumination at the surface of the sensor package. An IR blocking filter is added to

the light source. The analog gain of the sensor is set to x1. The exposure time,

∆t, is set as

50% of maximum. The illuminance, I, is adjusted so the average sensor output code, Xlight,

is roughly mid-range equivalent to a saturation level of 50%. Once Xlight has been recorded

the experiment is repeated with no illumination to give a value Xdark.

The sensitivity is then calculated as

.The result is expressed in volts per lux-

second.

The sensitivity of the VS6524 is given in

Table 31.

Table 30.

Optical specifications(1)

All measurements made at 23°C ± 2°C

Parameter

Min.

Typ.

Max.

Unit

Optical format

1/6

inch

Effective focal length

2.5

Aperture (F number)

2.8

Horizontal field of view

deg.

Vertical field of view

deg.

Diagonal field of view(2)

Value determined through calculation

deg.

Depth of field(3)

By design the device has an acceptable quality between hyperfocal distance /2 and infinity.

infinity

TV distortion

-1.5

1.5

Table 31.

VS6524 average sensitivity

Optical parameter

Value

Unit

Average sensitivity

0.71

V/lux.s

Xlight

Xdark

–

∆tl

⋅

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