LM9830 datasheet(18/45 Pages) NSC

18 / 45 page

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ILLUMINATION SETTINGS

Illumination Mode

Controls the function of the 3 LAMP outputs,

LAMPR, LAMPG, and LAMPB

Mode 0 is the Off/Reset state.

Mode 1 is typically used for CCFL lamps.

Mode 2 is for color scanning with tri-color

LEDs.

Mode 3 is for grayscale scanning with tri-

color LEDs.

LAMPR = LAMPG = LAMPB = 0V

(Power-On/Reset Default)

Illumination Mode 1 - LAMPR and LAMPB turn on

every line, with their on and off points controlled by

the Pixel Counter settings. LAMPG Output is

continuous PWM pulse stream. (Figure 28)

LAMPR and/or LAMPB may be set to stay on or off at

all times by setting the LAMP Off or LAMP On settings

(registers 2C-37) greater than the Line End value

(registers 20 and 21).

Illumination Mode 2 - LAMPR, LAMPG, LAMPB turn

on sequentially at the line rate, with their on and off

points controlled by Pixel Counter settings. (Figure

29)

Illumination Mode 3 - LAMPR, LAMPG, LAMPB turn

on every line, with their on and off points controlled by

the Pixel Counter settings. (Figures 30 and 31)

LAMPG PWM - MSB

(Illumination Mode 1)

nnnn

LAMPG output is a PWM pulse stream. Duty cycle is

n/4095. Clock for counter is CRYSTAL IN, giving max

output frequency of 12.2kHz for fCRYSTAL IN = 50MHz.

LAMPG PWM - LSB (Illumination Mode 1)

nnn nnnnn

LAMPR On - MSB

n nnnnnn pixels (1 - 16384)

This selects the pixel count at which the LAMPR

output goes high (if programmed)

LAMPR On - LSB

nnn nnnnn

LAMPR Off - MSB

n nnnnnn pixels (1 - 16384)

This selects the pixel count at which the LAMPR

output goes low (if programmed)

LAMPR Off - LSB

nnn nnnnn

LAMPG On - MSB

n nnnnnn pixels (1 - 16384)

This selects the pixel count at which the LAMPG

output goes high (if programmed)

LAMPG On - LSB

nnn nnnnn

LAMPG Off - MSB

n nnnnnn pixels (1 - 16384)

This selects the pixel count at which the LAMPG

output goes low (if programmed)

LAMPG Off - LSB

nnn nnnnn

LAMPB On - MSB

n nnnnnn pixels (1 - 16384)

This selects the pixel count at which the LAMPB

output goes high (if programmed)

LAMPB On - LSB

nnn nnnnn

LAMPB Off - MSB

n nnnnnn pixels (1 - 16384)

This selects the pixel count at which the LAMPB

output goes low (if programmed)

LAMPB Off - LSB

nnn nnnnn

STATIC OFFSET AND GAIN SETTINGS FOR ANALOG FRONT END

Static Offset (Red)

0 nnnnn Offset = +n*9.3mV, n = 0 to 31

1 nnnnn Offset = -n*9.3mV, n = 0 to 31

Static Offset (Green)

0 nnnnn Offset = +n*9.3mV, n = 0 to 31

1 nnnnn Offset = -n*9.3mV, n = 0 to 31

Static Offset (Blue)

0 nnnnn Offset = +n*9.3mV, n = 0 to 31

1 nnnnn Offset = -n*9.3mV, n = 0 to 31

Static Gain (Red)

0 nnnnnGain = 0.93 + 0.067*n (V/V), n = 0 to 31

1 nnnnnGain = 3(0.93 + 0.067*n) (V/V), n = 0 to 31

Static Gain (Green)

0 nnnnnGain = 0.93 + 0.067*n (V/V), n = 0 to 31

1 nnnnnGain = 3(0.93 + 0.067*n) (V/V), n = 0 to 31

Static Gain (Blue)

0 nnnnnGain = 0.93 + 0.067*n (V/V), n = 0 to 31

1 nnnnnGain = 3(0.93 + 0.067*n) (V/V), n = 0 to 31

Address

Function

Value

LM9830 Datasheet(PDF) 18 Page - National Semiconductor (TI)

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