DocID026155 Rev 1

3/10

AN4466

Overview

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1

Overview

Typically the VL6180X proximity sensor will be used in conjunction with some sort of glass

covering. The cover glass serves two main purposes:

1.

Provides physical protection of the device, including dust ingress prevention.

2.

Provides optical filtering for both the ALS and proximity functions.

The cover glass will normally be opaque with either two circular apertures or one oval

aperture to allow the emission and receiving of light. It is assumed that the filter is deposited

on the underside of the glass.

This application note will detail how to calculate the minimum aperture size for a specific air

gap between the VL6180X and cover glass. It will also detail some of the known issues

when selecting the correct optical filter.