TDA7476 STMicroelectronics, TDA7476 Datasheet - Page 14

• Manufacturer Part Number: TDA7476
• Description: IC PROCESSOR RADIO DIAGN 24-SOIC
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of TDA7476

• Applications: Automotive Systems
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7476
In this way only after that the TDA7476 has done for N times the turn-on diagnostic, it switches from turn-on to
permanent diagnostic mode.From now the TDA7476 always does the permanent diagnostic.To save time when
the audio system is switched on, it is possible to do the repetitive turn-on diagnostic when the car-radio is turned
off. In this case the steps to follow to do the repetitive turn-on diagnostic are the following:
1- to switch off the TDA7476 connecting STBY pin to ground;
2- to wait T
3- to switch on the TDA7476
4- to do the repetitive turn-on diagnostic as above described;
5- to turn off the TDA7476.
WARNING PIN
14/19
START
Step 4: repeat Step1, Step2, Step3 while the second, third, fourth, ...turn-on diagnostic has to be done.
During the last turn-on diagnostic the P sends ADD2, receives BYTE1, BYTE2, BYTE3, and sends
the acknowlegde after BYTE3
This is an open drain output pin that is activated when a fault condition is present for more than 2 sec
(TYP). The fault conditions related to the warning pin are as follows:
- AUX1, AUX2
- CH1, CH2, CH3, CH4, CH5:
The purpose of this pin is to alert the P and start with the permanent diagnostic routine only if faults
are present, thus avoiding CPU's waste of time.
START
Short to GND
Short Circuit to GND
Short Circuit to Vs
5V
ADD2
seconds (time necessary for the discharge of the capacitor). If C
ADD2
ACK
ACK
BYTE1
BYTE1
ACK
ACK
BYTE2
BYTE2
ACK
ACK
5V
BYTE3
= 10 F then T
BYTE3
ACK
5V
= 20ms typ;
STOP
STOP