Software specifications

TDA7565

12/19

Doc ID 9800 Rev 5

4

Software specifications

All the functions of the TDA7565 are activated by I2C interface.

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

TDA7565) or read instruction (from TDA7565 to µP).

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

Table 5.

Chip address

Bit

Instruction

D7

Address bit

D6

Address bit

D5

Address bit

D4

Address bit

D3

Address bit

D2

Address bit

D1

Address bit

D0(R/W)

Read/Write bit

0 = Write instruction

1 = read instruction

Table 6.

IB1

Bit

Instruction

D7

Sel. freq. switch 1

D6

Sel. freq. switch 2

D5

Offset detection start (D5 = 1)

Offset detection stop (D5 = 0) (off)

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

CD 1% (D0 = 0)

CD 10% (D0 = 1)