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TDA7566

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

DB1

DB2

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)

D7

Offset detection not activated (D7 = 0)

Offset detection activated (D7 = 1)

D6

Current sensor not activated (D6 = 0)

Current sensor activated (D6 = 1)

D5

Channel LR

current detection

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

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

D4

Channel LR

Turn-on diagnostic (D4 = 0)

Permanent diagnostic (D4 = 1)

D3

Channel LR

Normal load (D3 = 0)

Short load (D3 = 1)

D2

Channel LR

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

Open load detection (D2 = 1)

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

Output offset detection (D2 = 1)

D1

Channel LR

No short to Vcc (D1 = 0)

Short to Vcc (D1 = 1)

D0

Channel LR

No short to GND (D1 = 0)

Short to GND (D1 = 1)