TDA7405 datasheet(39/56 Pages) STMICROELECTRONICS

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TDA7405

I²C BUS INTERFACE

6.1 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

6.1.1 Auto increment

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

6.1.2 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 chi-

paddress.

6.1.3 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

C AZ

AAA

ACK

DATA

ACK

MSB

LSB

MSB

LSB

TDA7405 数据表(PDF) 39 Page - STMicroelectronics

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