User manual

Functional description VL6180X
32/79 DocID026171 Rev 6
2.13.5 Integration period
The integration period is the time over which a single ALS measurement is made. The
default integration period is 100ms. Integration times in the range 50-100 ms are
recommended to reduce impact of light flicker from artificial lighting.
2.13.6 ALS gain selection
Eight analog gain settings are available which can be selected manually depending on the
range and resolution required. Table 14.shows the actual characterized gains versus the
design targets. If a gain setting other than gain 20 is used, marginally greater accuracy can
be achieved by using the actual gain values in the light level equation in Section 2.13.4
when calculating the lux light level.
Table 14. Actual gain values
Note: The upper nibble of SYSALS__ANALOGUE_GAIN should always be set to 0x4.
Register setting {0x3F} Analog gain setting Actual gain values
0x46 1 1.01
0x45 1.25 1.28
0x44 1.67 1.72
0x43 2.5 2.60
0x42 5 5.21
0x41 10 10.32
0x40 20 20
0x47 40 40