STV2050A datasheet(12/83 Pages) STMICROELECTRONICS

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STV2050A - STRUCTURE OF THE PROGRAMMING SYSTEM

2 STRUCTURE OF THE PROGRAMMING SYSTEM

2.1 DATA STORAGE

The STV2050A is a programmable device. Some of the data, mainly the convergence param-

eters, must be able to be easily changed during TV set alignment or by the user, and must be

memorized when the TV set is switched off in order to be recovered when switched back on.

This data must therefore be stored in EEPROM.

The STV2050A has an embedded RAM for storing data used “in real time” at a high speed.

In order to simplify the microcontroller software, and to ensure a quick startup, the STV2050A

directly controls one or more (or up to seven) EEPROMs.

The STV2050A has 2 ports for I²C connections:

– The first one is used only for “SLAVE” connections: it is used to interface with a microcon-

troller in order to control the IC (customer adjustments,...). The microcontroller can write and

read the embedded RAM via this slave port.

– The second one is used only for “MASTER” connections: it is used to interface the

STV2050A with the EEPROM that stores the convergence data and some user adjustments.

The transfer of data between the EEPROM and the embedded RAM is fully managed by the

STV2050A.

Figure 6. I²C BUS Data Transfer

Data Tranfer Control

STV2050A

From / To

MCU

Slave I²C Interface

Logic Core

Embedded

RAM

Master I²C Interface

EEPROM

2k x 8 bits

STV2050A Datasheet(PDF) 12 Page - STMicroelectronics