VD6283TX datasheet(37/59 Pages) STMICROELECTRONICS

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ALS and flicker performances

Table 15. ALS operating characteristics

Parameter

Conditions

Min.

Typ.

Max.

Unit

Exposure time

EXTIME step size

1.52

1.6

1.68

Number of EXTIME steps overall,

1.6 ms to 1.6 s

1024

Steps

Inter measurement period

IM step size

Number of IM steps overall,

20 ms to 5.12 s

256

Steps

ADC count value before

calibration (1)

Minimum reported

irradiance level

24-bit ADC readout

—

256

—

Counts

16-bit ADC readout

(w/o low byte)

—

EXTIME =

0x001 to 0x047

(1.6 ms to 113.6

ms)

24-bit ADC readout

233045

Counts/

steps

16-bit ADC readout

(w/o low byte)

910

EXTIME =

0x048 to 0x3FF

(115.2 ms to 1.6 s)

24-bit ADC readout

16777215

Counts

16-bit ADC readout

(w/o low byte)

65535

Gain scaling (3)

(relative to 1x)

AGAIN = 0.7x

0.7

0.71

0.74

—

AGAIN = 0.8x

0.82

0.83

0.85

AGAIN = 1x

0.99

1.00

1.01

AGAIN = 1.25x

1.25

1.27

AGAIN = 1.7x

1.66

1.68

1.69

AGAIN = 2.5x

2.49

2.52

2.54

AGAIN = 3.3x

3.31

3.36

3.38

AGAIN = 5x

4.97

5.04

5.08

AGAIN = 7.1x

7.17

7.27

AGAIN = 10x

9.73

10.07

10.23

AGAIN = 16x

16.04

16.76

17.18

AGAIN = 25x

23.83

25.1

26.2

AGAIN = 33.3x

31.35

33.3

35.07

AGAIN = 50x

45.67

50.12

54.39

AGAIN = 66.6x

59.2

66.78

73.01

ALS readout RMS noise

16-bit ADC readout

AGAIN = 16x, EXTIME = 24 ms

Clear channel

Tamb = 25 °C, VDD = 1.8 V

Irradiance = 40 µW/cm2

0.25

Counts

Minimum detectable light

level (2)

AGAIN = 66x, EXTIME = 113.6 ms

Clear channel (3)

0.0015

Lux

AGAIN = 66x, EXTIME = 113.6 ms

0.007

VD6283TX

ALS and flicker performances

DS13735 - Rev 1

page 37/59

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