TDA7562B datasheet(19/30 Pages) STMICROELECTRONICS

19 / 30 page

TDA7562B

Diagnostics functional description

Doc ID 17984 Rev 2

19/30

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 “0” shortly after the mute transition.

TDA7562B Datasheet(PDF) 19 Page - STMicroelectronics