STPCATLAS datasheet(87/111 Pages) STMICROELECTRONICS

87 / 111 page

DESIGN GUIDELINES

Issue 1.0 - July 24, 2002

87/111

6.3.9. VGA INTERFACE

The STPC integrates a voltage reference and

video buffers. The amount of external devices is

then limited to the minimum as described in the

Figure 6-15.

All the resistors and capacitors have to be as

close as possible to the STPC while the circuit

protector DALC112S1 must be close to the VGA

connector.

The DDC[1:0] lines, not represented here, have

also to be protected when they are used on the

VGA connector.

COL_SEL can be used when implementing the

Picture-In-Picture function outside the STPC, for

example when multiplexing an analog video

source. In that case, the CRTC of the STPC has to

be genlocked to this analog source.

DCLK is usually used by the TFT display which

has RGB inputs in order to synchronise the picture

at the level of the pixel.

When the VGA interface is not needed, the signals

R, G, B, HSYNC, VSYNC, COMP, RSET can be

left unconnected, VSS_DAC and VDD_DAC must

then be connected to GND.

Figure 6-15. Typical VGA implementation

143

VDD_DAC

COMP

VREF_DAC

RSET

VSS_DAC

2.5V

10nF

100nF 47uF

AGND

COL_SEL

DCLK

HSYNC

VSYNC

75 1%

DALC112S1

AGND

3.3V

100nF

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