VL6180X datasheet(28/79 Pages) STMICROELECTRONICS

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Functional description

VL6180X

28/79

DocID026171 Rev 6

Position a white target (88% reflectance(g)) at a distance of 50 mm from the top of the

cover glass.

Perform a minimum of 10 range measurements and compute the average range (from

RESULT__RANGE_VAL{0x62}

If the average range is within the 50

± 3 mm, offset calibration is not required.

Otherwise, complete this calibration procedure.

Set SYSRANGE__PART_TO_PART_RANGE_OFFSET{0x24} = 0.

Perform a minimum of 10 range measurements and compute the average range (from

RESULT__RANGE_VAL{0x62}

Calculate the part-to-part offset as follows:

Write the part-to-part offset result (in two’s complement notation) to

SYSRANGE__PART_TO_PART_RANGE_OFFSET

2.12.4

Cross-talk calibration procedure

This section describes a procedure for calibrating system cross-talk.

Perform offset calibration if required (see Section 2.12.3).

Note:

If the offset is incorrectly calibrated, cross-talk calibration will be inaccurate.

Position a black target (3% reflectance(h)) at a distance of 100 mm from the top of the

cover glass.

Ensure SYSRANGE__CROSSTALK_COMPENSATION_RATE{0x1E} = 0.

Perform a minimum of 10 range measurements and compute the average return rate

(from RESULT__RANGE_RETURN_RATE{0x66}) and the average range (from

RESULT__RANGE_VAL{0x62}

Calculate the cross-talk factor as follows:

Write the cross-talk result in 9.7 format to

SYSRANGE__CROSSTALK_COMPENSATION_RATE

For example, cross-talk = 0.4 Mcps => 0.4 x 128 = 51.2. Write 51 to

SYSRANGE__CROSSTALK_COMPENSATION_RATE.

Note:

Cross-talk compensation is only applied to targets above 20 mm. This is to ensure that

cross-talk correction is not applied to near targets where the signal rate is decreasing. The

cross-talk height qualifier is defined in register

SYSRANGE__CROSSTALK_VALID_HEIGHT{0x21}

. The default is 20 mm.

Target reflectance should be high but absolute value is not critical.

part-to-part offset

50 mm

average range

–

Target reflectance should be low but absolute value is not critical.

cross-talk (in Mcps)

average return rate

average range

100 mm

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

–

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