VL6180X datasheet(31/79 Pages) STMICROELECTRONICS

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VL6180X

Functional description

2.13.3

ALS dynamic range

Table 13 shows the range of measurable light at all gains both with and without glass. In

most applications operating at a single gain setting should be possible.

2.13.4

ALS count to lux conversion

The output from the ambient light sensor is a 16-bit register, RESULT__ALS_VAL{0x50}.

The count output is proportional to the light level and can be converted into lux using the

following equation:

The factory calibrated ALS lux resolution is 0.32 lux/count for an analog gain of 1 (calibrated

without glass). The ALS lux resolution will require re-calibration in the final system where

cover glass is used. This can be done by recording the count output with and without glass

under the same conditions and multiplying the ALS lux resolution by the ratio of the two

counts as follows:

Table 13. ALS dynamic range(1)

ALS lux resolution = 0.32 lux/count

Analogue

gain setting

Dynamic range (no glass)

Dynamic range (10%

transmissive glass)

Min. (Lux)(2)

Minimum of 10 counts

Max. (Lux)

Minimum (Lux)

Maximum (Lux)

3.20

20800

32.0

>100,000

1.25

2.56

16640

25.6

>100,000

1.67

1.93

12530

19.3

>100,000

2.5

1.28

8320

12.8

83,200

0.64

4160

6.4

41,600

0.32

2080

3.2

20,800

0.16

1040

1.6

10,400

0.08

520

0.8

5,200

Light level (in lux)

ALS lux resolution

RESULT__ALS_VAL

Analog gain

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

100 ms

ALS integration time

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

ALS lux resolution (with glass)

RESULT__ALS_VAL (without glass)

RESULT__ALS_VAL (with glass)

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

ALS lux resolution (without glass)

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