TDA7300D datasheet(11/16 Pages) STMICROELECTRONICS

11 / 16 page

Transmission without Acknowledge

Avoiding to detect the acknowledge of the audio-

processor, the

µP can use a simplier transmission:

simply it waits one clock without checking the slave

acknowledging, and sends the new data.

This approach of course is less protected from

misworking and decreases the noise immunity.

Interface Protocol

The interface protocol comprises:

A start condition (S)

A chip address byte, containing the TDA7300

address (the 8th bit of the byte must be 0). The

TDA7300 must always acknowledge at the end

of each transmitted byte.

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

TDA7300 ADDRESS

MSB

first byte

LSB

MSB

LSB

MSB

LSB

0010

ACK

DATA

ACK

DATA

ACK

Data Transferred (N-bytes + Acknowledge)

ACK = Acknowledge

S = Start

P = Stop

MAX CLOCK SPEED 100kbits/s

SOFTWARE SPECIFICATION

Chip address (TDA7300 address)

001000

MSB

IIII I LSB

APPLICATION INFORMATION (continued)

Figure 23: Acknowledge on the I

2CBUS

Volume

Speaker

Audio Switch

Bass

Treble

–68dB

–38dB

Mono

+2.5dB

Status after power-on reset

DATA BYTES

MSB

LSB

Function

Volume Control

Speaker ATT LR

Speaker ATT RR

Speaker ATT LF

Speaker ATT RF

Audio switch

Bass control

Treble control

X = don’t care

Ax = 2dB steps

Bx = 10dB steps

Cx = 2.5dB steps

TDA7300

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