WM8232 datasheet(43/141 Pages) CIRRUS

43 / 141 page

WM8232

Rev 4.6

resolution being used. As TARGETINP* is an 8 bit register, the 4 MSBs of a data output code cannot

be changed.

16-bit ADC Resolution

For 16bit resolution the target code entered into TARGETINP* will ignore the 4 MSBs and 4 LSBs of

the 16-bit data output. For example if the desired code out is 0000111111110001, the value entered

into TARGETINP* would be 11111111.

10-bit ADC Resolution

For 10bit resolution the 4 MSBs of the 10bit data output code will be ignored. The 2 LSBs of the

target code should be set to ‘00’. For example if the desired code out is 0000111111, the value

entered into TARGETINP* would be 11111100.

BLC SCENARIOS OF OPERATION

The BLC can be used in various ways to suit the application, for example calibration can be done

once per page or once per line. Three potential scenarios of operation are suggested below.

Note: The registers FRAME_START and SEQ_START when set high by the user will automatically be

set low by the device.

SCENARIO 1

In this scenario, Coarse Adjust Calibration is enabled for the 1st line; Fine Adjust Calibration is enabled

for every line, with the Fine Adjust Calibration result recalculated every line. This scenario is suitable

for dealing with large amounts of D.C. drift throughout a frame; but this is at a cost of potential line-by-

line variation in the Fine Adjust result (dependent on sensor noise and the PGA gain). Table 14 shows

which registers are required for this scenario with example settings.

SETUP

BPIX_AVAIL

CADUR

FRAME_START

FA_EVERYLINE

Value

Table 14 Example Register Settings for Scenario 1

Black Pixels

Image Pixels

Use Fine Adjust Result here

Fine Adjust cleared

Line 1

Line 2

Line 3

Line 4

Line 5

Line 6

Line 7

Line n

- - -

Use Fine Adjust Result here

Auto Fine Adjust clear

Fine Adjust cleared

Figure 29 Scenario 1

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