Diagnostics functional description

TDA7562B

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Doc ID 17984 Rev 2

Figure 17.

SVR and output behavior (case 1: without turn-on diagnostic)

Figure 18.

SVR and output pin behavior (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

30 dB to 16 dB gain setting. They are as follows:

Figure 19.

Concerning short across the speaker / open speaker, the threshold varies from 30 dB to

16 dB gain setting, since different loads are expected (either normal speaker's impedance

or high impedance). The values in case of 30 dB gain are as follows: