VL6624 datasheet(86/106 Pages) STMICROELECTRONICS

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Optical specifications

VL6624/VS6624

86/106

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,

Δt, 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 VS6624 is given in

Table 42.

Table 41.

Optical specifications(1)

All measurements made at 23°C ± 2°C

Parameter

Min.

Typ.

Max.

Unit

Optical format

1/3

inch

Effective focal length

Aperture (F number)

3.2

Horizontal field of view

deg.

Depth of field

infinity

TV distortion

Table 42.

VS6624 average sensitivity

Optical parameter

VS6624

Unit

Average sensitivity

0.49

V/lux.s

Xlight

Xdark

–

Δtl

⋅

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