VL6180X datasheet(18/79 Pages) STMICROELECTRONICS

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Functional description

VL6180X

18/79

DocID026171 Rev 6

2.4.3

Interleaved mode

Figure 11. describes the continuous interleaved mode of operation where an ALS

measurement is immediately followed by a range measurement and repeated after an

interval specified by the ALS inter-measurement period.

To enable interleaved mode, set INTERLEAVED_MODE_ENABLE{0x2A3} = 1. Use

SYSALS__START

and SYSALS__INTERMEASUREMENT_PERIOD to control interleaved

operation.

Note:

Continuous range settings have no effect in this mode.

Figure 11. Interleaved mode

Note:

To ensure correct operation in any of the continuous modes, the user must ensure that the

inter-measurement period is sufficient for the operation to be completed within the inter-

measurement period. Failure to do so could result in unpredictable behavior.

2.4.4

Continuous mode limits

To take account of oscillator tolerances and internal processing overheads it is necessary to

place the following constraints on continuous mode operations. The following equations

define the minimum inter-measurement period to ensure correct operation:

Continuous range:

SYSRANGE__MAX_CONVERGENCE_TIME + 5

≤

SYSRANGE__INTERMEASUREMENT_PERIOD * 0.9

Continuous ALS:

SYSALS__INTEGRATION_TIME * 1.1

≤ SYSALS__INTERMEASUREMENT_PERIOD *

0.9

Interleaved mode:

(SYSRANGE__MAX_CONVERGENCE _TIME + 5) + (SYSALS__INTEGRATION_TIME *

1.1)

≤ SYSALS__INTERMEASUREMENT_PERIOD * 0.9

Table 6. gives an example how to apply these limits in continuous interleaved mode

operating at a sampling rate of 10 Hz.

ALS

Range

ALS inter-measurement period

ALS

Range

ALS

Range

Interrupt

flags

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