TDA7562

10/17

with the 4 ohm speaker unconnected is considered as double fault.

S. GND (so) / S. GND (sk) in the above table make a distinction according to which of the 2 outputs is shorted

to ground (test-current source side= so, test-current sink side = sk). More precisely, so = CH+, sk = CH-.

FAULTS AVAILABILITY

All the results coming from I2Cbus, by read operations, are the consequence of measurements inside a defined

period of time. If the fault is stable throughout the whole period, it will be sent out.

the previous diag. cycle (i.e. The device is in turned On, with a short to Gnd, then the short is removed and micro

reading operation occurs, the bytes do not show the short). In general to observe a change in Diagnostic bytes,

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: PIN2 > 7V --- 10ms --- (STAND-BY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT

TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STAND-BY IN) --- 10ms --- PIN2 = 0

disappear).

high-offset message disappears).

FAST MUTING

The muting time can be shortened to less than 1ms by setting (IB2) D5 = 1. This option can be useful in transient

battery situations (i.e. during car engine cranking) to quickly turnoff the amplifier for avoiding any audible effects

caused by noise/transients being injected by preamp stages.

Double fault table for Turn On Diagnostic

S. GND (so)

S. GND (sk)

S. Vs

S. Across L.

S. GND (so)

S. GND

S. GND

S. Vs + S. GND

S. GND

S. GND (sk)

/

S. GND

S. Vs

S. GND

S. Vs

/

/

S. Vs

S. Vs

S. Across L.

/

/

/

S. Across L.