Diagnostics functional description

TDA7566

18/29

Doc ID 9801 Rev 6

4.7

I2C programming/reading sequence

A correct turn on/off sequence respectful of the diagnostic timings and producing no audible

noises could be as follows (after battery connection):

TURN-ON: (STANDBY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT

TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STANDBY IN)

Car Radio Installation: DIAG ENABLE (write) --- 200 ms --- I2C read (repeat until All faults

disappear).

AC TEST: FEED H.F. TONE -- AC DIAG ENABLE (write) --- WAIT > 3 CYCLES --- I2C read

(repeat I2C reading until tweeter-off message disappears).

OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I2C reading (repeat

I2C reading until high-offset message disappears).