LM9833 datasheet(12/42 Pages) NSC

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HORIZONTAL RESOLUTION AND DATAMODE SETTINGS

Horizontal DPI Divider

This register determines the horizontal

resolution of the scan.

Scan resolution = Optical resolution divided

by the Horizontal_DPI_Divider.

000÷1

001÷1.5

010÷2

011÷3

100÷4

101÷6

110÷8

111÷12

Pixel Packing

This register determines how many bits in

each byte of data are transmitted to the host

when DataMode = 0

0 0

1 bit/pixel (1 bit grayscale/3 bit color)

0 1

2 bits/pixel (2 bit grayscale/6 bit color)

1 0

4 bits/pixel (4 bit grayscale/12 bit color)

1 1

8 bits/pixel (8 bit grayscale/24 bit color)

DataMode

When DataMode = 0, the pixel data is fully

processed, going through the Offset,

Shading, Horizontal DPI Adjust, Gamma,

and Pixel Packing blocks.

When DataMode = 1, 16 bit data is extracted

following the Shading Multiplier stage.

Gamma and any other post processing must

be done by the host.

1, 2, 4, or 8 bit image data,

as determined by the Pixel Size setting.

16 bit image data - sent in 2 bytes, MSB first:

15 14 13 12 11 10 09 08 - 07 06 05 04 03 02 01 00

Analog Bias Current (Percent of Nominal)

The recommended setting is 80% for best

performance. Lower settings will reduce

power consumption further but may degrade

ADC INL and DNL performance.

0 0

100% (analog supply current = ~81mA)

0 1

80% (analog supply current = ~65mA)

1 0

70% (analog supply current = ~57mA)

1 1

50% (analog supply current = ~41mA)

TURBO AND PREVIEW MODE SETTINGS

Turbo/Preview Mode Select

0 0

Normal Operation

0 1

Preview Mode (for CCD Sensors)

1 0

Turbo Mode (for CIS Sensors)

N/A

Turbo/Preview Mode Speed

0 1

x3 (3 Channel Pixel Rate Mode Only)

1 0

x4 (3 Channel Pixel Rate Mode Only)

1 1

x6 (3 Channel Pixel Rate Mode Only)

SENSOR CONFIGURATION

Input Signal Polarity

0 Negative (Most CCD Sensors and Toshiba CIS)

1 Positive (Most CIS Sensors)

CDS On/Off

CDS Off

CDS On

Standard/Even-Odd Sensor

Standard (1 pixels per Ø period)

Even/Odd (2 pixels per Ø period)

CIS TR1 Timing Mode

0 0

Off - use standard CCD Timing

CIS TR1 Timing Mode 1:

TR1 pulse = exactly one Ø clock,

starting at rising edge of Ø1

CIS TR1 Timing Mode 2:

TR1 pulse = exactly one Ø clock,

TR1 centered around Ø1 high.

N/A

Fake Optical Black Pixels

(for Dyna-type CIS sensors)

Off: Normal operation

On: RS pulse held high for entire Optical Black period

Address

Function

Value

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