TDA7402 datasheet(49/71 Pages) STMICROELECTRONICS

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TDA7402

I2C bus interface

49/71

I2C bus interface

9.1

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)

S = Start

R/W = "0" -> Receive-Mode (Chip could be programmed by µP)

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

ACK = Acknowledge

P = Stop

Max clock speed 500kbits/s

9.2

Auto increment

If bit I in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled.

9.3

Transmitted data (send mode)

SM = Soft mute activated

ST = Stereo

P = Pause

X = Not Used

The transmitted data is automatically updated after each ACK.

Transmission can be repeated without new chipaddress.

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.

With this programming all the outputs are muted to VREF (VOUT= VDD/2).

CHIP ADDRESS

SUBADDRESS

DATA 1....DATA n

MSB

LSB

MSB

LSB

MSB

LSB

0001

R/W

ACK

AAA

ACK

DATA

ACK

Table 10.

Transmitted data (send mode)

MSB

LSB

Table 11.

Reset condition

MSB

LSB

110

TDA7402 数据表(PDF) 49 Page - STMicroelectronics

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