SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (s)

A chip address byte, containing the TDA7317

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

TDA7317 must always acknowledge at the end

of each transmitted byte.

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

TDA7316 ADDRESS

MSB

first byte

LSB

MSB

LSB

MSB

LSB

S

1

00

0

0

1A

0

ACK

DATA

ACK

DATA

Data Transferred (N-bytes + Acknowledge)

ACK = Acknowledge

S = Start

P = Stop

MAX CLOCK SPEED 100kbits/s

SOFTWARE SPECIFICATION

Chip address (84 or 86 Hex)

1

MSB

00

00

1

A

0

LSB

A = Logic level on pin ADDR

A = 1 if ADDR pin = open

A = 0 if ADDR pin = connected to ground

SOFTWARE SPECIFICATION (continued)

DATA BYTES (detailed description)

Volume

MSB

LSB

FUNCTION

0

X

B2

B1

B0

A2

A1

A0

Volume 0.375dB steps

0

0

0

0

1

1

1

1

0

0

1

1

0

0

1

1

0

1

0

1

0

1

0

1

0

-0.375

-0.75

-1.125

-1.5

-1.875

-2.25

-2.625

0

X

B2

B1

B0

A2

A1

A0

Volume -3dB steps

0

0

0

0

1

1

0

0

1

1

0

0

0

1

0

1

0

1

0

-3

-6

-9

-12

-15

TDA7317

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