MSB

LSB

FUNCTION

X

X

X

I

A3A2

A1A0

0

0

0

0

Input Selector

0

0

0

1

Loudness

0

0

1

0

Volume

0

0

1

1

Bass, Treble

0

1

0

0

Speaker Attenuator LF

0

1

0

1

Speaker Attenuator LR

0

1

1

0

Speaker Attenuator RF

0

1

1

1

Speaker Attenuator RR

1

0

0

0

Input Gain Middle

1

0

0

1

Mute

AUTO INCREMENT

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

SUBADDRESS (receive mode)

TRANSMITTED DATA

Send Mode

MSB

LSB

X

X

X

X

X

SM

ZM

P

P = Pause (Active low)

ZM = Zero crossing muted (HIGH active)

SM = Soft mute activated (HIGH active)

X = Not used

The transmitted data is automatically updated after each ACK.

Transmission can be repeated without new chipaddress.

SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (s)

A chip address byte,(the LSB bit determines

read (=1)/write (=0) transmission)

A subaddress byte.

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

LSB

MSB

LSB

S

100010

X

X

I

DATA

ACK

P

ACK = Acknowledge

S = Start

P = Stop

I = Auto Increment

X = Not used

MAX CLOCK SPEED 500kbits/s

ADDRpin open

A = 0

ADDRpin close to Vs A = 1

TDA7437

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