TDA7529 datasheet(17/60 Pages) STMICROELECTRONICS

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TDA7529

Function description

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3.11

AFSAMPLE/AFHOLD

On the TDA7529 there are two dedicated open drain pins (AFSAMPLE and AFHOLD), that

allow the control of the DSP (mute and quality controls) during AF update.

Details are given in Chapter 5.

3.12

Serial BUS interface

The TDA7529 has a serial data port for communication with the microcontroller. It is used for

programming the device and for reading out its detectors. This port supports data

communication using the SPI and the I2C protocol. The data transfer of several consecutive

bytes is supported by the auto increment feature.

The "PS"- pin (Protocol Select) determines which communication protocol is used. The

information is not latched, so any level change at this pin immediately affects the protocol

used by the TDA7529.

The SPI protocol is selected by setting PS = 0 while, during the I2C operation, PS needs to

be open (internally set to 1).

SPI-Protocol: CPOL=1, CPHA=1.

The CS pin performs the Chip Select function during the SPI operation; it has to be reset to

0 during transmission or reception, otherwise set to 1 (the CS pin is set to 1 by leaving it

open).

Both the CS and the AS functions are performed by the CS pin.

When the I2C mode is used, the "AS" pin determines which I2C address or group of

addresses (see below) is used. Three different external connections are defined to

represent three groups of addresses (refer to the following table for details). The information

is not latched, so any level change at this pin immediately affects the address used by the

TDA7529.

First the IC address is transmitted including the R/W bit for setting the direction of the

following data transfer

Table 6.

Supports data communication using the SPI and the I2C protocol

SPI signal

I2C signal

Signal 1

Protocol Select SPI/I2C

Signal 2

Chip Select

Address Select

Signal 3

CLK

Clock

CLK

Clock

Signal 4

MOSI

Master Out – Slave In

DATA

bidirectional Data

Signal 5

MISO

Master In – Slave Out

GP6

General Purpose Out

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