VD6283TX datasheet(8/59 Pages) STMICROELECTRONICS

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3.3.4

Saturation

If an excessive light level is sensed by the VD6283, a saturation condition may occur. Digital saturation defines

the maximum channel count value software can read. This value is dependent on the exposure time programmed

before the ALS operation started.

•

If EXTIME ≤ 113.6 ms (71 steps), the saturation level is 910 counts/step

•

If EXTIME > 113.6 ms (71 steps) the saturation level is 65535 counts

Note:

Values based on 16-bit ADC format

Note:

step = 1.6 ms (see Table 15. ALS operating characteristics)

Note:

To ensure correct functioning of user applications, it is recommended that application software first checks

VD6283 channels are not saturated, before the calibration data are used further (e.g. for setting AWB, CCT

etc.). This should be performed on VD6283 raw data.

3.3.5

AC light flicker extraction

The VD6283 features a digital module that extracts AC light signals (i.e. flicker) based on analog readouts over

time. The AC signal produced is then coded in PDM format.

This PDM signal can be output on the GPIO2 pin. This digital signal can be filtered externally to produce a

baseband analog signal of the AC flicker.

3.3.6

Flicker mapping configuration

Table 6. Flicker mapping configurations

Configuration

GPIO1

GPIO2

External H/W

Host I/F

Analog flicker

Interrupt

PDM

RC filter

ADC

Analog flicker connects the VD6283 flicker signal to an ADC module (i.e. host or other). External RC filtering is

required before connecting the ADC input (Figure 4. Application schematic, ALS and flicker in analog format).

VD6283TX

Operating modes

DS13735 - Rev 1

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