AR0331 datasheet(28/52 Pages) ONSEMI

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AR0331

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SENSOR FRAME RATE

The time required to read out an image frame (TFRAME)

can be derived from the number of clocks required to output

each image and the pixel clock.

The frame-rate is the inverse of the frame period.

fps +

TFRAME

(eq. 3)

The number of clocks can be simplified further into the

following parameters:

• The number of clocks required for each sensor row

(line_length_pck)

This parameter also determines the sensor row period

when referenced to the sensor readout clock. (TROW =

line_length_pck x 1/CLK_PIX)

• The number of row periods per frame

(frame_length_lines)

• An extra delay between frames used to achieve a

specific output frame period (extra_delay)

TFRAME +

(CLK_PIX)

[frame_length_lines

line_length_pck ) extra_delay]

(eq. 4)

Figure 28. Frame Period Measured in Clocks

Row Period (TROW)

line_length_pck will determine the number of clock

periods per row and the row period (TROW) when combined

with the sensor readout clock. line_length_pck includes

both the active pixels and the horizontal blanking time per

row. The sensor utilizes two readout paths, as seen in

Figure 21, allowing the sensor to output two pixels during

each pixel clock.

The minimum line_length_pck is defined as the

maximum of the following three equations:

ADC Readout Limitation:

line_length_pck ≥1100

(eq. 5)

Digital Readout Limitation:

x_addr_end–x_addr_start ) 1

(x_odd_inc ) 1)

0.5

(eq. 6)

Output Interface Limitations:

x_addr_end–x_addr_start ) 1

(x_odd_inc ) 1)

0.5

) 96 (eq. 7)

Row Periods Per Frame

frame_length_lines determines the number of row periods

(TROW) per frame. This includes both the active and

blanking rows. The minimum vertical blanking value is

defined by the number of OB rows read per frame, two

embedded data rows, and two blank rows. A minimum

number of idle rows equal to the T2 integration time should

be added in HDR mode to allow for changes in integration

time by an auto exposure algorithm. For example, if the

coarse integration time is 320 lines and the exposure ratio is

16x, then the minimum vertical blanking would be 8 + 2 +

2 + 20 = 32 rows. The minimum (default) number of idle

rows is 4.

Minimum frame_length_lines +

y_addr_end–y_addr_start ) 1

(y_odd_inc)1)

) min_vertical_blanking

(eq. 8)

The sensor is configured to output frame information in

two embedded data rows by setting R0x3064[8] to 1

(default). If R0x3064[8] is set to 0, the sensor will instead

output two blank rows. The data configured in the two

embedded rows is defined in “Embedded Data and

Statistics”.

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