TDA7561

Software specifications

Doc ID 8326 Rev 6

19/27

7

Software specifications

All the functions of the TDA7561 are activated by I2C interface.

The bit 0 of the "Address byte" defines if the next bytes are write instruction (from µP to

TDA7561) or read instruction (from TDA7561 to µP).

Chip address

X = 0 Write to device

X = 1 Read from device

If R/W = 0, the µP sends 2 "Instruction Bytes": IB1 and IB2.

D7

D0

1101100

X

D8 Hex

Table 6.

IB1

Bit

Instruction decoding bit

D7

X

D6

Diagnostic enable (D6 = 1)

Diagnostic defeat (D6 = 0)

D5

Offset detection enable (D5 = 1)

Offset detection defeat (D5 = 0)

D4

Front channel

Gain = 26dB (D4 = 0)

Gain = 12dB (D4 = 1)

D3

Rear channel

Gain = 26dB (D3 = 0)

Gain = 12dB (D3 = 1)

D2

Mute front channels (D2 = 0)

Unmute front channels (D2 = 1)

D1

Mute rear channels (D1 = 0)

Unmute rear channels (D1 = 1)

D0

X