TDA7476_01 Datasheet, PDF (1/19 Pages) STMicroelectronics – CAR RADIO DIAGNOSTIC PROCESSOR

TDA7476
CAR RADIO DIAGNOSTIC PROCESSOR
s WIDE OPERATING VOLTAGE RANGE
s ST-BY FUNCTION (C-MOS)
s LOW QUIESCENT ST-BY CURRENT
CONSUMPTION
s I²C BUS INTERFACE WITH 2 EXTERNALLY
SELECTABLE ADDRESSES
s 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)
s 2 AUX INPUTS FOR FAULT DETECTION IN
THE ANTENNA AND BOOSTERS SUPPLY
LINE- short to GND- open load
s WARNING PIN FUNCTION (interrupt facility)
ACTIVATED IN THE FOLLOWING
CONDITION:
- audio channel shorted to V_S
- audio channel shorted to GND
- aux input shorted to GND
s NOISE FREE DIAGNOSTICS OPERATION
s PROTECTORS
s LOAD DUMP VOLTAGE
s OPEN GND
s REVERSED BATTERY
s ESD
PIN CONNECTION (Top view)
MULTIPOWER BCD TECHNOLOGY
SO-24
ORDERING NUMBER: TDA7476
DESCRIPTION
The car radio diagnostic processor is an interface
chip in BCD Technology intended for car radio appli-
cations. It is able to detect potential faults coming
from any misconnection in the car radio or in the har-
ness 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 com-
patible) in order to disable the ICs under fault and/or
to alert the micro-controller by means of warning
messages.
April 2001
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
D97AU570A
CH5-
CH5+
CH4+
CH4-
CH3-
CH3+
CH2+
CH2-
CH1-
CH1+
T-CAP
CSR
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