TDA7404D datasheet(22/35 Pages) STMICROELECTRONICS

22 / 35 page

I2C bus interface

TDA7404

22/35

I2C bus interface

5.1

Interface protocol

The interface protocol comprises:

●

a start condition (S)

●

a chip address byte (the LSB bit determines read / write transmission)

●

a subaddress byte

●

a sequence of data (N-bytes + acknowledge)

●

a stop condition (P)

●

the max. clock speed is 500 Kbits/s

Figure 17.

Software specification

= Start

R/W

= "0" -> Receive-Mode (Chip could be programmed by P)

"1" -> Transmission-Mode (Data could be received by P)

ACK

= Acknowledge

= Stop

5.2

Transmitted data (send mode)

SM = Soft mute activated

X = Not Used

The transmitted data is automatic updated after each ACK. Transmission can be repeated

without new chipaddress.

5.3

Reset condition

A Power on reset is invoked if the supply voltage is below than 3.5V. After that the following

data is written automatically into the registers of all subaddresses:

The programming after POR is marked bold-face / underlined in the programming tables.

R/W

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D99AU1044

SUBADDRESS

DATA 1 to DATA n

I2 I1

A3 A2 A1 A0

MSB

LSB

MSB

LSB

110

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