August 2008

Rev 1

1/29

UM0576

User manual

HDMI and video switches using the

STEVAL-CCH002V1 demonstration board

Introduction

This document explains the functioning and operation of the STEVAL-CCH002V1

demonstration board which demonstrates the functionalities of the STMAV335, STMAV340,

STHDMI002A and STDVE003A analog and digital video switches.

The objective of this demonstration board is to display the capabilities of ST's video switches

and buffers and also the appropriate use of signal line protection devices, which have been

exhaustively used in this demonstration board at all I/O lines, whether it is standard analog

or high-speed transition minimized differential signaling (TMDS) digital signals.

Demonstration of the various devices is done by appropriate jumper settings on the

demonstration board, and all necessary I/O interface connectors as applicable for each

signal format are provided. Standard interconnects available in the market can be used to

evaluate the demonstration board.

The demonstration board has a 16 character x 2 line backlit LCD which shows the selection

status and a preprogrammed microcontroller senses all the control signals and

appropriately displays it on the LCD.

The demonstration board may be powered by the 9 V adapter supplied or by a standard 9V

adapter with a current capacity of at least 500 mA. The source need not be regulated. On

board regulators supply +5 V and +3.3 V as required.

To summarize, the STEVAL-CCH002V1 serves to demonstrate the following:

The board also demonstrates to a large extent, the recommended PCB layout in end

applications utilizing these devices. Especially critical layout aspects in high-speed HDMI

bus have been carefully addressed in this demonstration board.

www.st.com