CS7620 datasheet(29/70 Pages) CIRRUS

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CS7620

DS301PP2

4.3

Power Down Control 2

Default = 00; Read/Write (address 02h)

4.4

Operation Control 1

Default = 09h; Read/Write (address 06h).

Bit Number

765432

Bit Name

Reserved

pd_htim

Reserved

Default

----

Bit

Mnemonic

Function

7:2

Reserved

pd_htim

Horizontal Timing Power Down: When written with a ‘1’, the horizontal tim-

ing generator powers down. Should be powered down when horizontal timing

is not being used by the system. In this mode the chip is a “timing slave.”

Reserved

Bit Number

3210

Bit Name

low_res

tim_modes2

tim_modes1

tim_modes0

bits_out1

blk_dis

off_range

Default

1001

Bit

Mnemonic

Function

low_res

Low Resolution Mode: This mode can be used to cut the current consump-

tion of the chip by 20 mA. The output of the ADC will have 6 bits of resolution

in this mode, and the output of the chip will have 9 bits after using the DRX

circuitry. It is intended to be used when driving an LCD display or any other

time when a lower resolution picture is acceptable.

tim_modes2

Timing Generator Select: The type of timing signals output by the chip can

be selected using these control bits. IBM35CCDPIX13 2x2 and

IBM35CCDPIX13 3x4 modes, support type IBM CCDs with different color filter

patterns. Note that register 1Bh needs to be rewritten with correct low resolu-

tion values for black rows if low resolution mode is used (see Table 3).

The chip’s default power up setting is hardcoded to be IBM35CCD2PIX1. So

that the registers that hold the number of lines, the number of pixels per line,

the number of black lines, and the number of active lines are all set up to their

proper values. If IBM35CCDPIX13 is to be used, the values on all those reg-

isters has to be changed appropriately (see Tables 5 and 6).

tim_modes1

tim_modes0

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