AR0130CSSC00SPBA0-DP datasheet(24/53 Pages) ONSEMI

24 / 53 page

AR0130 DS Rev. L Pub. 6/15 EN

©Semiconductor Components Industries, LLC, 2015.

AR0130: 1/3-Inch CMOS Digital Image Sensor

Features

Maintaining a Constant Frame Rate

Maintaining a constant frame rate while continuing to have the ability to adjust certain

parameters is the desired scenario. This is not always possible, however, because register

updates are synchronized to the read pointer, and the shutter pointer for a frame is

usually active during the readout of the previous frame. Therefore, any register changes

that could affect the row time or the set of rows sampled causes the shutter pointer to

start over at the beginning of the next frame.

By default, the following register fields cause a “bubble” in the output rate (that is, the

vertical blank increases for one frame) if they are written in video mode, even if the new

value would not change the resulting frame rate. The following list shows only a few

examples of such registers; a full listing can be seen in the AR0130 Register Reference.

•x_addr_start

• x_addr_end

• y_addr_start

• y_addr_end

• frame_length_lines

• line_length_pclk

• coarse_integration_time

• fine_integration_time

•read_mode

The size of this bubble is (Integration_Time × tROW), calculating the row time according

to the new settings.

The Coarse_Integration_Time and Fine_Integration_Time fields may be written to

without causing a bubble in the output rate under certain circumstances. Because the

shutter sequence for the next frame often is active during the output of the current

frame, this would not be possible without special provisions in the hardware. Writes to

these registers take effect two frames after the frame they are written, which allows the

integration time to increase without interrupting the output or producing a corrupt

frame (as long as the change in integration time does not affect the frame time).

Synchronizing Register Writes to Frame Boundaries

Changes to most register fields that affect the size or brightness of an image take effect

on the frame after the one during which they are written. These fields are noted as

“synchronized to frame boundaries” in the AR0130 Register Reference. To ensure that a

after the leading edge of FV and before the trailing edge of FV.

As a special case, in single frame mode, register writes that occur after FV but before the

next trigger will take effect immediately on the next frame, as if there had been a Restart.

However, if the trigger for the next frame occurs during FV, register writes take effect as

with video mode.

Fields not identified as being frame-synchronized are updated immediately after the

to predict if they affect the shutter pointer.

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