AS260 datasheet(24/45 Pages) ONSEMI

24 / 45 page

AR0260 DS Rev. G Pub. 4/15 EN

©Semiconductor Components Industries, LLC,2015.

AR0260: 1/6-Inch 1080P High-Definition (HD) Digital Image Sensor

Analog Gain

Frame Rate Control

The formulas for calculating the frame rate of the AR0260 are shown below.

The line length is programmed directly in pixel clock periods through register

line_length_pck. For a specific window size, the minimum line length can be found in

Equation 1:

(EQ 1)

Note that line_length_pck also needs to meet the minimum line length requirement set

by min_line_length_pck. The row time can either be limited by the time it takes to

sample and reset the pixel array for each row, or by the time it takes to sample and read

out a row. Values for min_line_blanking_pck are provided in “Minimum Row Time” on

page 24.

The frame length is programmed directly in number of lines in the register

frame_length_lines. For a specific window size, the minimum frame length can be found

in Equation 2:

(EQ 2)

The frame rate can be calculated from these variables and the pixel clock speed as

shown in Equation 3:

(EQ 3)

If coarse_integration_time is set larger than frame_length_lines the frame size will be

expanded to coarse_integration_time + 1.

Minimum Row Time

The minimum row time and blanking values with default register settings are shown in

Table 12.

In addition, enough time must be given to the output FIFO so it can output all data at the

set frequency within one row time.

There are therefore two checks that must all be met when programming

line_length_pck:

• line_length_pck > min_line_length_pck in Table 12.

• line_length_pck > (x_addr_end - x_addr_start + x_odd_inc)/((1+x_odd_inc)/2) +

min_line_blanking_pck in Table 12.

Table 12:

Minimum Row Time and Blanking Numbers

No Row Binning

Row Binning

min_line_blanking_pck

0x0492

0x07C4

min_line_length_pck

0x05D8

0x09C8

minimum line_length_pck

x_addr_end - x_addr_start

subsampling factor

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

min_line_blanking_pck





minimum frame_length_lines

y_addr_end - y_addr_start

subsampling factor

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

min_frame_blanking_lines





frame rate

cam_sensor_cfg_pixclk



line_length_pck x frame_length_lines

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

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