AR0331 datasheet(18/52 Pages) ONSEMI

18 / 52 page

AR0331

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Figure 17. The Row Integration Time is Greater Than the Frame Readout Time

Vertical Blanking

Read

Shutter

Vertical Blanking

TCOARSE = coarse_integration_time x TROW

TFRAME = frame_length_lines x TROW

20.7 ms = 1390 rows x 14.8 μs/row

16.6 ms = 1125rows x 14.8 μs/row

Image

4.1 ms

Pointer

Time

Extended Vertical Blanking

The minimum frame-time is defined by the number of row

periods per frame and the row period. The sensor frame-time

will increase if the coarse_integration_time is set to a value

equal to or greater than the frame_length_lines.

GAIN STAGES

The analog gain stages of the AR0331 sensor are shown

in Figure 18. The sensor analog gain stage consists of a

variable ADC reference. The sensor will apply the same

analog gain to each color channel. Digital gain can be

configured to separate levels for each color channel.

Figure 18. Gain Stages in AR0331 Sensor

ADC

Reference

Digital Gain

with Dithering

1x, 2x, 4x, and 8x

1x to 16x

(128 steps per 6dB)

The level of analog gain applied is controlled by the

coarse_gain register. The recommended analog gain settings

are listed in Table 8. A minimum analog gain of 1.23x is

recommended. Changes to these registers should be done

prior to streaming images.

AR0331 Datasheet(PDF) 18 Page - ON Semiconductor