TDA7476 Datasheet, PDF (1/15 Pages) STMicroelectronics – CAR RADIO DIAGNOSTIC PROCESSOR

®
TDA7476
CAR RADIO DIAGNOSTIC PROCESSOR
WIDE OPERATING VOLTAGE RANGE
ST-BY FUNCTION (C-MOS)
LOW QUIESCENT ST-BY CURRENT CON-
SUMPTION
I2C BUS INTERFACE WITH 2 EXTERNALLY
SELECTABLE ADDRESSES
UP TO 5 BTL EQUIVALENT INPUTS FOR
FAULT DETECTION IN THE AUDIO CHAN-
NELS
- 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 CONDI-
TION:
- audio channel shorted to V_S
- audio channel shorted to GND
- aux input shorted to GND
NOISE FREE DIAGNOSTICS OPERATION
PROTETCTORS
LOAD DUMP VOLTAGE
PRELIMINARY DATA
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 loud-
speaker 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 warn-
ing messages.
PIN CONNECTION (Top view)
GND
SDA
SCL
ADD
W
AUX1 OUT
AUX1 IN
AUX2 IN
AUX2 OUT
5V
ST-BY
V_S
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
D97AU570
CH5-
CH5+
CH4+
CH4-
CH3-
CH3+
CH2+
CH2-
CH1-
CH1+
T-CAP
CURR. SET. RES.
December 1999
1/15
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.