VL6180X datasheet(29/79 Pages) STMICROELECTRONICS

部件名	VL6180X

功能描述	Proximity and ambient light sensing (ALS) module

PDF	79 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

29 / 79 page

DocID026171 Rev 6

29/79

VL6180X

Functional description

2.12.5

Cross-talk limit

A practical limit for cross-talk is < 3.0 Mcps. This is based on two factors:

The return rate for a 3% reflective target at 100 mm without glass is typically around 1.5

Mcps. If glass is added with a cross-talk of 3.0 Mcps, the resultant return rate will be 4.5

Mcps. This results in a cross-talk correction factor of x3 so for a 100 mm target the raw

range will be in the region of 30 mm. To ensure the

SYSRANGE__CROSSTALK_VALID_HEIGHT

restriction is not breached, the minimum

raw range allowing for noise margin is around 30 mm.

A cross-talk correction factor of x3 also means that any range noise will be multiplied

by 3 so noise also becomes a limiting factor.

2.12.6

Cross-talk vs air gap

Figure 18 shows the typical cross-talk vs air gap using ST cover glass with oval aperture.

Above 2.5 mm, the cross-talk rises rapidly.

Figure 18. Cross-talk vs air gap

VL6180X 数据表(PDF) 29 Page - STMicroelectronics