VL6180X datasheet(19/79 Pages) STMICROELECTRONICS

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VL6180X

Functional description

2.5

Range timing

Figure 12 gives a breakdown of total execution time for a single range measurement.

•

The pre-calibration phase is fixed (3.2 ms).

•

The range convergence time is variable and depends on target distance/reflectance

(see Table 7).

•

The recommended readout averaging period is 4.3 ms. Readout averaging helps to

reduce measurement noise. The recommended setting for

READOUT__AVERAGING_SAMPLE_PERIOD{0x10A}

is 48(c) but is programmable in

the range 0-255. Note however that lower settings will result in increased noise.

Note:

When a target is detected, register RESULT__RANGE_RETURN_CONV_TIME{0x80} returns

the actual convergence time before readout averaging. Range convergence and readout

averaging must be completed within the specified max convergence time.

Figure 12. Total range execution time

Table 6. Interleaved mode limits (10 Hz operation)

Parameter

Period (ms)

SYSALS__INTERMEASUREMENT_PERIOD

100

Effective ALS INTERMEASUREMENT PERIOD

SYSRANGE__MAX_CONVERGENCE_TIME

Total RANGE EXECUTION TIME

SYSALS__INTEGRATION_TIME

Total ALS INTEGRATION TIME

TOTAL EXECUTION TIME

Default readout averaging period is calculated as follows: 1300 µs + (48 x 64.5 µs) = 4.3 ms

Readout

averaging

Range convergence

Pre-cal

4.3 ms

Convergence time

(variable)

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