VL6180 datasheet(24/73 Pages) STMICROELECTRONICS

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Functional description

VL6180

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DocID024986 Rev 14

Note:

Only one data stream can be buffered at one time. There is no associated time stamp

information.

The clear buffer command is not immediate; it takes effect on the next range start

command.

The history buffer works independently of interrupt control i.e. the history buffer records all

new samples; its operation is unchanged in threshold and window modes.

2.11

Wrap Around Filter

Wrap-around is an effect linked to the ratio between the VCSEL pulse period and the photon

return pulse.

Figure 15. Wrap around

High reflective targets (like mirrors) placed at a far distance (>600mm) from the VL6180 can

still produce enough return signal for the VL6180 to declare a valid target and meet the

wrap-around condition resulting in a wrong (under-estimated) returned distance.

The WAF implemented in the API is able to automatically detect if a target is in the wrap-

around condition and filter it by returning an invalid distance (Range.errorStatus = 16). The

WAF is enabled/disabled via VL6180x_FilterSetState() and read with

VL6180x_FilterGetState().

2.12

Scaling

The default scaling factor is 3, which allows for maximum ranging capabilities. The scaling

factor can be decreased to x2 or x1 for short range applications.

Table 9. History buffer

History buffer

Range

(High byte)

(Low byte)

Range [15] (newest)

Range [14]

Range [13]

Range [12]

Range [11]

Range [10]

Range [9]

Range [8]

Range [7]

Range [6]

Range [5]

Range [4]

Range [3]

Range [2

Range [1]

Range [0] (oldest)

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