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| TDA7562B Datasheet, PDF (19/30 Pages) STMicroelectronics – 4 x 46 W multifunction quad power amplifier with built-in diagnostics features | |||
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TDA7562B
Diagnostics functional description
4.7
I2C Programming/reading sequence
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: (STANDBY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT
TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STANDBY IN)
Car Radio Installation: DIAG ENABLE (write) --- 200 ms --- I2C read (repeat until All faults
disappear).
AC TEST: FEED H.F. TONE -- AC DIAG ENABLE (write) --- WAIT > 3 CYCLES --- I2C read
(repeat I2C reading until tweeter-off message disappears).
OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I2C reading (repeat
I2C reading until high-offset message disappears).
4.8
Fast muting
The muting time can be shortened to less than 1.5 ms by setting (IB2) D5 = 1. This option
can be useful in transient battery situations (i.e. during car engine cranking) to quickly
turnoff the amplifier for avoiding any audible effects caused by noise/transients being
injected by preamp stages. The bit must be set back to â0â shortly after the mute transition.
Doc ID 17984 Rev 2
19/30
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