STV2001 datasheet(35/46 Pages) STMICROELECTRONICS

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STV2001

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Figure 20. Waveforms (DRIVE adjustment)

14.4.7 - Bright Window

Contrast Gain can be increased by 1.5X when the

I2C command “GainWin” is issued or GWIN (Pin

16) pulse value reaches its Turn-ON threshold.

Bright Window gain can be controlled separately

by I2C command or pulse voltage at “GAINWIN”

pin. Although both controls are independent, max

gain is still limited to 1.5x, not 1.5x + 1.5x.

14.4.8 - Blanking Generator

A vertical blanking pulse is generated

(see Figure 21). The output level is a positive go-

ing pulse of 9.5V. The vertical blanking is started

by the vertical sync pulse and by the falling edge of

VFly pulse. If there is no VFly pulse (VFly>6.5V),

the vertical blanking the vertical blanking start co-

incides with the beginning of the vertical capacitor

discharge time.

The blanking output generates a superimposed

variable DC voltage. The 6-bit adjustment range is

1 V to 4.5 V. This is used to allow brightness con-

trol through G1. Additionally, this pin is used for

spot killer suppression. The 0.8 V of Vcc threshold

will trigger the output into a high level state result-

ing from the Vcc decay.

Figure 21. VBDC (Pin 18) Output Voltage Waveform

HSYNC

CONT

BPCP

HFly

Video IN

BRT

BLACK

VDC

OUT1

OUT2

OUT3

two examples of

drive adjustment (1)

Note : 1. Drive adjustment modifies the following voltages : VCONT, VBRT.

Drive adjustment does not modify the following voltages : VDC and VBLACK.

DC level controlled by

9.5V

6-bit DAC

4.5 V

1.0 V

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