CS7620 datasheet(30/70 Pages) CIRRUS

30 / 70 page

CS7620

DS301PP2

bits_out1

Number of Data Bits Out: The range of the output data can be determined

by these bits. The data internal to the chip has a 13-bit range. The output can

be this full range, half this range (12 bits), or an eighth of this range (10 bits).

If 12-bit data is selected, the top half of the 13-bit range is saturated to the

maximum 12-bit code. If 10-bit data is selected, the compander curve which

is user programmable is employed to map the 13-bit data to the 10-bit output.

0 - 10 bits output

1 - 10 bits output

2 - 13 bits output

3 - 12 bits output

bits_out1

blk_dis

Black Level Loop Disabled: If the user chooses to adjust the black level him-

self through register access, he may disable the internal black level loop. This

loop usually updates the black level to what it calculates to be the correct level.

If disabled, the offset used will be determined from the value written in the

black level accumulator register.

0 - internal black level loop is enabled

1 - black level loop is disabled

off_range

Offset Range: The black level loop is used to cancel any offsets from the

CCD and chip circuitry. If the offsets are small, the user has the option to de-

crease the offset cancellation range for the added advantage of increasing the

resolution of the offset cancellation.

0 - smaller offset cancellation range used (~50 mV)

1 - larger offset cancellation range used (~100 mV)

Mode value

Mode

000

IBM35CCD2PIX1 and IBM35CCDPIX13 CCD high resolution mode

001

IBM35CCD2PIX1 CCD low resolution (viewfinder) mode

010

reserved

100

reserved

101

IBM35CCD13PIX CCD (2x2) low resolution (viewfinder) mode

110

IBM35CCD13PIX CCD (3x4) low resolution (viewfinder) mode

111

external timing used

Table 8. Different Resolution Operating Modes

Bit

Mnemonic

Function

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