TDA7476

® TDA7476 CAR RADIO DIAGNOSTIC PROCESSOR PRELIMINARY DATA WIDE OPERATING VOLTAGE RANGE ST-BY FUNCTION (C-MOS) LOW QUIESCENT ST-BY CURRENT CONSUMPTION I2C BUS INTERFACE WITH 2 EXTERNALLY SELECTABLE ADDRESSES UP TO 5 BTL EQUIVALENT INPUTS FOR FAULT DETECTION IN THE AUDIO CHANNELS - short to GND - short to Vs - short across the load (at turn-on) - open load (at turn-on) 2 AUX INPUTS FOR FAULT DETECTION IN THE ANTENNA AND BOOSTERS SUPPLY LINE - short to GND - open load WARNING PIN FUNCTION (interrupt facility) ACTIVATED IN THE FOLLOWING CONDITION: - audio channel shorted to VS - audio channel shorted to GND - aux input shorted to GND NOISE FREE DIAGNOSTICS OPERATION PROTETCTORS LOAD DUMP VOLTAGE PIN CONNECTION (Top view) MULTIPOWER BCD TECHNOLOGY SO24 OPEN GND REVERSED BATTERY ESD DESCRIPTION The car radio diagnostic processor is an interface chip in BCD Technology intended for car radio applications. It is able to detect potential faults coming from any misconnection in the car radio or in the harness when installing the set. The device is able to reveal any fault in the loudspeaker lines and in the antenna and booster supply lines, providing a proper output signal (I2C bus compatible) in order to disable the ICs under fault and/or to alert µcontroller by means of warning messages. GND SDA SCL ADD W AUX1 OUT AUX1 IN AUX2 IN AUX2 OUT 5V ST-BY VS 1 2 3 4 5 6 7 8 9 10 11 12 D97AU570 24 23 22 21 20 19 18 17 16 15 14 13 CH5CH5+ CH4+ CH4CH3CH3+ CH2+ CH2CH1CH1+ T-CAP CURR. SET...