TDA9106 datasheet(17/30 Pages) STMICROELECTRONICS

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OPERATING DESCRIPTION

I - GENERAL CONSIDERATIONS

I.1 - Power Supply

The typical values of the power supply voltages

VCC and VDD are respectively 12V and 5V. Perfect

operationis obtained if VCC and VDD are maintened

in the limits : 10.8 to 13.2V and 4.5 to 5.5V.

In order to avoid erratic operation of the circuit

during transient phase of VCC switching on, or

switching off, the value of VCC is monitored and the

outputsof the circuit are inhibited if VCC is less than

7.5V typically.

In the same manner,VDD is monitored and internal

set-up is made until VDD reaches 4V (see I

Control Table for power on reset).

In order to have a verygood powersupply rejection,

the circuit is internally powered by several internal

voltage references (the unique typical value of

which is 8V). Two of these voltage references are

externally accessible, one for the vertical part and

one for the horizontal one. If needed, these voltage

references can be used (until load is less than

5mA).Furthermore it is necessary to filter the a.m.

voltage references by the use of external capacitor

connectedto ground,in order to minimize the noise

and consequently the “jitter” on vertical and hori-

zontal output signals.

I.2 - I

2C Control

TDA9106 belongs to the I

2C controlled device fam-

ily, instead of being controlled by DC voltages on

dedicated control pins, each adjustment can be

realized through the I

2C Interface.

The I

2C bus is a serial bus with a clock and a data

input. The general function and the bus protocolare

specified in the Philips-bus data sheets.

The interface (Data and Clock) is TTL-level com-

patible. The internal threshold level of the input

comparator is 2.2V (when VDD is 5V). Spikes of up

to 50ns are filtered by an integrator and maximum

clock speed is limited to 400kHz.

The data line (SDA) can be used in a bidirectional

way that means in read-mode the IC clocks out a

reply information (1 byte) to the micro-processor.

The bus protocol prescribes always a full-byte

transmission. The first byte after the start condition

is used to transmit the IC-address(7 bits-8C) and

the read/write bit (0 write - 1 read).

I.3 - Write Mode

In write mode the second byte sent contains the

subaddress of the selected function to adjust (or

controls to affect)and the thirdbyte the correspond-

ing data byte.It is possible to send more than one

data byte to the IC. If after the third byte no stop or

start condition is detected, the circuit increments

automatically the momentary subaddress in the

subaddress counter by one (auto-increment

mode). So it is possible to transmit immediately the

next data bytes without sending the IC address or

subaddress.It can be useful so as to reinitialize the

whole controls very quickly (flash manner). This

procedure can be finished by a stop condition.

The circuit has 16 adjustment capabilities: 3 for

Horizontal part, 4 for Vertical one, 2 for E/W correc-

tion, 2 for original Corner correction, 2 for the

Dynamic Horizontal phase control,1 for Moire op-

tion and 2 for Horizontal Dynamic Focus.

20 bits are also dedicated to several controls

(ON/OFF, Horizontal Safety Frequency, Synchro

Priority, Detection Refresh and Xray reset).

I.4 - Read Mode

During read mode the second byte transmits the

reply information.

The reply byte contains Horizontal and Vertical

Lock/Unlock status, Xray activated or not, the Hori-

zontal and Vertical polarity detection. It also con-

tains Synchro detection status that is useful for

µP

to assign Sync priority.

A stop condition always stops all activities of the

bus decoder and switches the data and the clock

line (SDA and SCL) to high impedance.

See I

2C Subaddressand control tables.

I.5 - Synchro Processor

The internal Sync Processor allows the TDA9106

to accept any kind of input synchro signals :

- separated Horizontal & Vertical TTL-compatible

sync signals,

- composite Horizontal &Vertical TTL-compatible

sync signals,

- sync on green or composite video signal.

TDA9106

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