Software specifications

TDA7566

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Doc ID 9801 Rev 6

If R/W = 1, the TDA7566 sends 4 "Diagnostics Bytes" to mP: DB1, DB2, DB3 and DB4.

Table 7.

IB2

Bit

Instruction decoding bit

D7

0

D6

0

D5

0

D4

Standby on - Amplifier not working - (D4 = 0)

Standby off - Amplifier working - (D4 = 1)

D3

Power amplifier mode diagnostic (D3 = 0)

Line driver mode diagnostic (D3 = 1)

D2

Current detection diagnostic enabled (D2 = 1)

Current detection diagnostic defeat (D2 = 0)

D1

0

D0

0

Table 8.

DB1

Bit

Instruction decoding bit

D7

Thermal warning active (D7 = 1)

D6

Diag. cycle not activated or not terminated (D6 = 0)

Diag. cycle terminated (D6 = 1)

D5

Channel LF

Current detection

Output peak current < 250mA - Open load (D5 = 1)

Output peak current > 500mA - Open load (D5 = 0)

D4

Channel LF

Turn-on diagnostic (D4 = 0)

Permanent diagnostic (D4 = 1)

D3

Channel LF

Normal load (D3 = 0)

Short load (D3 = 1)

D2

Channel LF

Turn-on diag.: No open load (D2 = 0)

Open load detection (D2 = 1)

Offset diag.: No output offset (D2 = 0)

Output offset detection (D2 = 1)

D1

Channel LF

No short to Vcc (D1 = 0)

Short to Vcc (D1 = 1)

D0

Channel LF

No short to GND (D1 = 0)

Short to GND (D1 = 1)