WM8141

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 3.0 October 2000

20

OPERATING MODES

Table 5 summarises the most commonly used modes, the clock waveforms required and the register

contents required for CDS and non-CDS operation.

MODE

DESCRIPTION

CDS

AVAILABLE

MAX

SAMPLE

RATE

SENSOR

INTERFACE

DESCRIPTION

TIMING

REQUIRE-

MENTS

REGISTER

CONTENTS

WITH CDS

REGISTER

CONTENTS

WITHOUT

CDS

1

Colour

Pixel-by-Pixel

Yes

2MSPS

The 3 input channels

are sampled in

parallel. The signal is

then gain and offset

adjusted before being

multiplexed into a

single data stream

and converted by the

ADC, giving an output

data rate of 6MSPS

max.

MCLK max

MCLK:

VSMP

ratio is 6:1

SetReg1:

03(hex)

SetReg1:

01(hex)

2

Monochrome/

Colour

Line-by-Line

Yes

2MSPS

As mode 1 except:

Only one input

channel at a time

is continuously

sampled.

MCLK max

MCLK:

VSMP

ratio is 6:1

SetReg1:

07(hex)

SetReg1:

05(hex)

3

Fast

Monochrome/

Colour

Line-by-Line

Yes

4MSPS

Identical to mode 2

MCLK max

MCLK:

VSMP

ratio is 3:1

Identical to

mode 2 plus

SetReg3:

bits 5:4 must

be set to

0(hex)

Identical to

mode 2

4

Maximum

speed

Monochrome/

Colour

Line-by-Line

No

6MSPS

Identical to mode 2

MCLK max

MCLK:

VSMP

ratio is 2:1

CDS not

possible

SetReg1:

45(hex)

5

Slow Colour

Yes

1.5MSPS

Identical to mode 1

MCLK max

MCLK:

VSMP

ratio is

2n:1, n

≥ 4

Identical to

mode 1

Identical to

mode 1

6

Slow

Monochrome/

Colour

Line-by-Line

Yes

1.5MSPS

Identical to mode 2

MCLK max

MCLK:

VSMP

ratio is

2n:1, n

≥ 4

Identical to

mode 2

Identical to

mode 2

Table 5 WM8141 Operating Modes

Notes: 1.

In Monochrome mode, SetReg3 bits 7:6 determine which input is to be sampled.

2.

For Colour Line-by-Line, set control bit LINEBYLINE. For input selection, refer to Table 4, Colour Selection

Description in Line-by-Line Mode.

3.

MCLK max = 12MHz at AVDD = 5V, MCLK max = 8MHz at AVDD = 3.3V.