AR0835HS datasheet(43/70 Pages) ONSEMI

43 / 70 page

AR0835HS: 1/3.2-Inch 8 Mp CMOS Digital Image Sensor

Integration Time for Interlaced HDR Readout

AR0835HS_DS Rev. D Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

Scaler

Scaling reduces the size of the output image while maintaining the same field-of-view.

The input and output of the scaler is in Bayer format.

When compared to skipping, scaling is advantageous as it avoids aliasing. The scaling

factor, programmable in 1/16 steps, is used for horizontal and vertical scalers.

The AR0835HS sensor is capable of horizontal scaling and full (horizontal and vertical)

scaling.

The scale factor is determined by:

• n, which is fixed at 16

• m, which is adjustable with register R0x0404

• Legal values for m are 16 through 96, giving the user the ability to scale from

1:1 (m=16) to 1:6 (m=96).

Frame Rate Control

The formulas for calculating the frame rate of the AR0835HS 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 from

Equation 8:

(EQ 8)

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

in register 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 43.

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

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

in Equation 9:

(EQ 9)

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

shown in Equation 10:

(EQ 10)

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

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:

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

vt_pixel_clock_mhz x 1 x 106

line_length_pck_x frame_length_lines

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

AR0835HS Datasheet(PDF) 43 Page - ON Semiconductor

AR0835HS Datasheet(HTML) 43 Page - ON Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70

Datasheet Download

Link URL