TDA75610SEP
Diagnostics functional description
4
Diagnostics functional description
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It is recommended to activate this function at the turn-on (standby out) through an I2C bus
request. Detectable output faults are:
SHORT TO GND
SHORT TO VS
SHORT ACROSS THE SPEAKER
OPEN SPEAKER
To verify if any of the above misconnections are in place, a subsonic (inaudible) current
pulse (Figure 21) is internally generated, sent through the speaker(s) and sunk back.The
Turn On diagnostic status is internally stored until a successive diagnostic pulse is
requested (after a I2C reading).
If the "standby out" and "diag. enable" commands are both given through a single
programming step, the pulse takes place first (during the pulse the power stage stays 'off',
showing high impedance at the outputs).
Afterwards, when the amplifier is biased, the PERMANENT diagnostic takes place. The
previous turn-on state is kept until a short appears at the outputs.
Figure 21. Turn-on diagnostic: working principle
Figure 22 and 23 show SVR and OUTPUT waveforms at the turn-on (standby out) with and
without turn-on diagnostic.
Figure 22. SVR and output behavior (Case 1: without turn-on diagnostic)
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