TDA7402 datasheet(40/59 Pages) STMICROELECTRONICS

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TDA7402

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9.0 I C 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.

9.4 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

0001

R/W ACK C

ACK

DATA

ACK P

MSB

LSB

MSB

LSB

111

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