AR0331 datasheet(37/72 Pages) ONSEMI

37 / 72 page

AR0331_DS Rev. L Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AR0331: 1/3-Inch 3.1 Mp/Full HD Digital Image Sensor

Sensor Frame Rate

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 on page 29, 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 equa-

tions:

ADC Readout Limitation:

(EQ 5)

Digital Readout Limitation:

(EQ 6)

Output Interface Limitations:

(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 algo-

rithm. 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.

(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” on page 45.

Notes:

1. min_vertical_blanking includes the default number (4) of idle rows.

Table 14:

Minimum Vertical Blanking Configuration

R0x3180[7:4]

OB Rows

min_vertical_blanking1

0x8 (Default)

8 OB Rows

8 OB + 8 = 16

0x4

4 OB Rows

4 OB + 8 = 12

0x2

2 OB Rows

2 OB + 8 = 10

line_length_pck

1100



---

x_addr_end

x_addr_start

–

x_odd_inc

 0.5



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



---

x_addr_end

x_addr_start

–1

x_odd_inc

 0.5



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



Minimum frame_length_lines

y_addr_end

y_addr_start

–1

y_odd_inc

 2



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

min_vertical_blanking

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