General structure

STA540SAN

22/26

Doc ID 18306 Rev 1

8.8

Handling of the diagnostic information

As different diagnostic information is available at the same pin (clipping detection, output

fault, thermal proximity), the signal must be handled correctly in order to discriminate the

event. This could be done by taking into account the different timing of the diagnostic output

during each case.

Normally, clip-detector signalling under faulty conditions produces a low level at pin 10.

Based on this assumption, an interface circuitry to differentiate the information is shown in

Figure 33.

Figure 32.

Waveforms

Figure 33.

Interface circuit diagram

t

t

t

ST_BY PIN

VOLTAGE

Vs

OUTPUT

WAVEFORM

Vpin 10

WAVEFORM

SHORT TO GND

OR TO Vs

D05AU1604_bc

CLIPPING

THERMAL

PROXIMITY

10