CS7622 データシートの表示（PDF） - Cirrus Logic

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CS7622

CCD Imager Analog Processor

Cirrus Logic 

CS7622

Operation Control 1

Default = 0Ah; Read/Write (address 04h)

Bit Number

Bit Name

Default

7

6

RESERVED

0

0

5

dout_edge

0

4

low_res

0

3

bits_out1

1

2

bits_out0

0

1

blk_dis

1

0

off_range

0

Bit

Mnemonic

Function

7:6

-

reserved

This register is used to set when dout changes values. Relative to CLKO

5

dout_edge

0 - dout output changes on the falling edge of CLKO

1 - dout output changes on the rising edge of CLKO

Preview Mode: This mode can be used to cut the current consumption of the

chip by 20 mA. The output of the ADC will have 6 bits of resolution in this mode,

4

low_res

and the output of the chip will have 9 bits after using the DRX circuitry. It is in-

tended to be used when driving an LCD display or any other time when a lower

resolution picture is acceptable.

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-

3:2

bits_out1-0

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 pro-

grammable 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

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.

1

blk_dis

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

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 decrease

0

off_range

the offset cancellation range for the added advantage of increasing the resolu-

tion of the offset cancellation.

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

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

DS322PP1

19

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