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TDA7561

Fig. 15 and 16 show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and without TURN-ON

DIAGNOSTIC.

Figure 15. SVR and Output behaviour (CASE 1: without turn-on diagnostic)

Figure 16. SVR and Output pin behaviour (CASE 2: with turn-on diagnostic)

The information related to the outputs status is read and memorized at the end of the current pulse top. The

acquisition time is 100 ms (typ.). No audible noise is generated in the process. As for SHORT TO GND / Vs the

fault-detection thresholds remain unchanged from 26 dB to 12 dB gain setting. They are as follows:

Bias (power amp turn-on)

t

Diagnostic Enable

(Permanent)

Permanent diagnostic

acquisition time (100mS Typ)

Permanent Diagnostics data (output)

permitted time

I2CB DATA

Vsvr

Out

FAULT

event

Read Data

B ias (pow e r am p turn -on)

perm i tted tim e

Tu rn -on diagnostic

acquis itio n tim e (1 0 0 m S Typ )

t

R ead D a ta

Perm an ent diagn ostic

acquis itio n tim e (1 0 0 m S Ty p )

Perm a n e nt Dia gnostics da ta (o utput)

perm itt ed tim e

D iagno stic Enab le

(Turn-o n )

Tu rn-on D iagn ostic s data (output)

p e rm itt e d ti m e

I2 C B D ATA

Vs vr

Ou t

D iagno stic E nable

(P e rm anent)

FA U LT

ev ent

D01AU1253

S.C. to GND

x

S.C. to Vs

0V

1.8V

x

Normal Operation

1.2V