AR0130CSSC00SPBA0-DP datasheet(30/53 Pages) ONSEMI

30 / 53 page

AR0130 DS Rev. L Pub. 6/15 EN

©Semiconductor Components Industries, LLC, 2015.

AR0130: 1/3-Inch CMOS Digital Image Sensor

Features

Column Correction

The AR0130 uses column parallel readout architecture to achieve fast frame rate.

Without any corrections, the consequence of this architecture is that different column

signal paths have slightly different offsets that might show up on the final image as

structured fixed pattern noise.

AR0130 has column correction circuitry that measures this offset and removes it from

the image before output. This is done by sampling dark rows containing tied pixels and

measuring an offset coefficient per column to be corrected later in the signal path.

Column correction can be enabled/disabled via R0x30D4[15]. Additionally, the number

of rows used for this offset coefficient measurement is set in R0x30D4[3:0]. By default

this register is set to 0x7, which means that 8 rows are used. This is the recommended

value. Other control features regarding column correction can be viewed in the AR0130

sensor streaming is disabled and the appropriate triggering sequence must be followed

as described below.

Column Correction Triggering

Column correction requires a special procedure to trigger depending on which state the

sensor is in.

Column Triggering on Startup

When streaming the sensor for the first time after power-up, a special sequence needs to

be followed to make sure that the column correction coefficients are internally calcu-

lated properly.

1. Follow proper power up sequence for power supplies and clocks

2. Apply sequencer settings if needed

3. Apply frame timing and PLL settings as required by application

4. Set analog gain to 1x and low conversion gain

5. Enable column correction and settings

6. Disable auto re-trigger for change in conversion gain or col_gain, and enable column

correction always. (R0x30BA = 0x0008).

7. Enable streaming (R0x301A[2] = 1) or drive the TRIGGER pin HIGH.

8. Wait 9 frames to settle. (First frame after coming up from standby is internally column

correction disabled.)

9. Disable streaming (R0x301A[2] = 0) or drive the TRIGGER pin LOW.

After this, the sensor has calculated the proper column correction coefficients and the

sensor is ready for streaming. Any other settings (including gain, integration time and

conversion gain etc.) can be done afterwards without affecting column correction.

Column Correction Retriggering Due to Mode Change

Since column offsets is sensitive to changes in the analog signal path, such changes

require column correction circuitry to be retriggered for the new path. Examples of such

mode changes include: horizontal mirror, vertical mirror, changes to column correction

settings.

When such changes take place, the following sequence needs to take place:

1. Disable streaming (R0x301A[2]=0) or drive the TRIGGER pin LOW.

2. Enable streaming (R0x301A[2]=1) or drive the TRIGGER pin HIGH.

3. Wait 9 frames to settle.

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