TDA7563 Datasheet, PDF (13/20 Pages) STMicroelectronics – MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES

Figure 21. Thermal Foldback Diagram
Vout
TH. WARN.
ON
Vout
TH. SH.
START
TH. SH. _{Tj ( °C)}
END
TDA7563
CD out
< TSD
> TSD (with same input
signal)
Tj ( °C)
Tj ( °C)
I²C PROGRAMMING/READING SEQUENCES
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
Car Radio Installation: PIN2 > 7V --- 10ms DIAG ENABLE (write) --- 200 ms --- I²C read (repeat until All faults
disappear).
OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I²C reading (repeat I²C reading until
high-offset message disappears).
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