APPLICATION INFORMATION (continued)

The audioprocessor which has been addressed

has to generate an acknowledge after the recep-

tion of each byte, otherwise the SDA line remains

at the HIGH level during the ninth clock pulse

time. In this case the master transmitter can gen-

erate the STOP information in order to abort the

transfer.

Transmission without Acknowledge

Avoiding to detect the acknowledge of the audio-

processor, the

µP can use a simpler 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 TDA7310

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

TDA7310 must always acknowledge at the end

of each transmitted byte.

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

SOFTWARE SPECIFICATION

Chip address

1

MSB

00

01

0

A

0

LSB

A = LOGIC LEVEL ON PIN ADDR

DATA BYTES

MSB

LSB

FUNCTION

0

1

1

1

1

0

0

0

0

1

1

0

0

1

1

1

B2

0

1

0

1

0

1

1

B1

B1

B1

B1

B1

G1

0

1

B0

B0

B0

B0

B0

G0

C3

C3

A2

A2

A2

A2

A2

S2

C2

C2

A1

A1

A1

A1

A1

S1

C1

C1

A0

A0

A0

A0

A0

S0

C0

C0

Volume control

Speaker ATT LR

Speaker ATT RR

Speaker ATT LF

Speaker ATT RF

Audio switch

Bass control

Treble control

Ax = 1.25dB steps; Bx = 10dB steps; Cx = 2dB steps; Gx = 6.25dB steps

STATUS AFTER POWER ON RESET

Volume

speaker

audio Switch

bass

treble

gain

-77.5dB

-37.5dB

Stereo 5

+2dB

+2dB

0dB

TDA7310 ADDRESS

MSB

first byte

LSB

MSB

LSB

MSB

LSB

S

1

00

0

1

0A

0

ACK

DATA

ACK

DATA

ACK

P

Data Transferred (N-bytes + Acknowledge)

ACK = Acknowledge

S = Start

P = Stop

MAX CLOCK SPEED 100kbits/s

TDA7310

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