WM8224 datasheet(32/50 Pages) CIRRUS

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WM8224

Production Data

PD, Rev 4.2, September 2013

SCENARIO 2

Coarse Adjust and Fine Adjust Calibration enabled for the 1

st line, with the Fine Adjust result updated

on the 1

st line only. This scenario is suitable for adjusting for black-level d.c. drift on a frame-by-frame

basis; there will be no line-by-line variation in the black-level from the BLC circuitry. Table 7 shows

which registers are required for this scenario with example settings.

SETUP

BPIX_AVAIL

CADUR

FRAME_START

Value

Table 7 Example Register Settings for Scenario 2

Figure 28 Scenario 2

SCENARIO 3

Coarse Adjust Calibration enabled for the 1

st line, Fine Adjust Calibration enabled every line with the

Fine Adjust result accumulated throughout frame and used every line. This scenario allows any

variation in the black-level to be tracked throughout the frame by accumulating the Fine Adjust result

over multiple lines. This method does not deal with as large amounts of d.c. drift throughout the

frame as scenario 1, but it will produce less line-by-line variation. Table 8 shows which registers are

required for this scenario with example settings.

SETUP

BPIX_AVAIL

CADUR

FRAME_START

FA_EVERYLINE

FA_ACCUM

Value

Table 8 Example Register Settings for Scenario 3

Figure 29 Scenario 3

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