VL6180X datasheet(20/79 Pages) STMICROELECTRONICS

20 / 79 page

Functional description

VL6180X

20/79

DocID026171 Rev 6

2.6

Interrupt modes

The VL6180X can be configured to generate an ALS or range interrupt flag under any of the

following conditions:

•

New sample ready

•

Level low (RESULT__RANGE_VAL < SYSRANGE__THRESH_LOW)

•

Level high (RESULT__RANGE_VAL > SYSRANGE__THRESH_HIGH)

•

Out of window (RESULT__RANGE_VAL < SYSRANGE__THRESH_LOW) OR

(RESULT__RANGE_VAL > SYSRANGE__THRESH_HIGH)

In new sample ready mode, an interrupt flag will be raised at the end of every measurement

irrespective of whether the measurement is valid or if an error has occurred. This mode is

particularly useful during development and debug. In level interrupt mode the system will

raise an interrupt flag if either a low or high programmable threshold has been crossed. Out

of window interrupt mode activates both high and low level thresholds allowing a window of

operation to be specified. Interrupt modes for Range and ALS are configured via register

SYSTEM__INTERRUPT_CONFIG_GPIO{0x14}

Note:

In level or window interrupt modes range errors will only trigger an interrupt if the logical

conditions described above are met.

2.7

Range error codes

The system carries out a number of range checks during every range measurement to

ensure the validity of each range result. Register RESULT__RANGE_STATUS{0x4D}

returns an error code if one of the checks fails. Table 8 gives a summary of the possible

error codes.

Table 7. Typical range convergence time (ms)

Range (mm)

Target reflectance

17%

88%

0.43

0.33

0.18

0.94

0.73

0.28

0.18

1.89

1.40

0.51

0.18

3.07

2.25

0.81

0.18

4.35

3.24

1.18

0.24

5.70

4.22

1.60

0.32

7.07

5.35

2.07

0.49

8.41

6.45

2.58

0.50

9.58

7.56

3.14

0.61

100

10.73

8.65

3.69

0.73

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