TDA7406 datasheet(45/64 Pages) STMICROELECTRONICS

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TDA7406

I2C bus interface

45/64

I2C bus interface

13.1

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

13.1.1

Auto increment

If bit I in the subaddress byte is set to “1”, the auto increment of the subaddress is enabled.

13.1.2

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 chip address.

13.1.3

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.

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

S 1 0 0 0 1 1 0 R/W ACK

T AZ

ACK

DATA

ACK

MSB

LSB

MSB

LSB

TDA7406 数据表(PDF) 45 Page - STMicroelectronics

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