E-TDA7476 STMicroelectronics, E-TDA7476 Datasheet - Page 11

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

Specifications of E-TDA7476

• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 3. Timing Diagram on the I
Figure 4. Acknowledge on the I
SOFTWARE SPECIFICATIONS
The TDA7476 is activated by turning-on the ST-BY pin (CMOS compatible). In this condition it waits for the
I2CBus addressing byte ADD1 (WRITE to TDA7476)
This sequence (where the bit 0 of ADD1 is at 0 level) enables the acquisition routine and starts the single pulse
(containing infrasonic harmonics) for the test. During this period the data regarding all the outputs are memo-
rized.After a period Twait1 that depends on the value of the timing capacitor (see Timing) the P redirects the
TDA7476 by the byte ADD2.
The byte ADD2 contains the bit 0 at 1 level. This enables the reading mode, TDA7476's. The 3 bytes with the
diagnostic information BYTE1, BYTE2, BYTE3 (READ FROM TDA7476) are now transmitted to the P.
The address of TDA7476 is selected using pin ADD (pin 4) .
If ADD is connected to ground, then A = 0 and the TDA7476 address is 0100010X.
If ADD is connected to 5V, than A = 1 and the TDA7476 address is 0100011X
A) TURN-ON DIAGNOSTIC - The first time that the TDA7476 is addressed by I
Here following the turn-on diagnostic output bytes
- CH1, CH2, CH3, CH4, CH5
- AUX1, AUX2
The TDA7476 provides two types of diagnostic information:
of diagnostic information is activated:
(*) Detected if the power amplifiers are in ST-BY condition.
Short Circuit to GND
Short Circuit to Vs
Open Load (*)
Short Circuit across the load (*)
Short Circuit to GND (*)
Open Load (*)
(*) Detected if the high side drivers attached to the Aux outputs are ON.
S
S
010001A
010001A
ADD1
ADD1
SCL
SDA
SCL
SDA
START
0
0
START
MSB
ACK
ACK
2
1
CBUS
2
CBUS
BYTE1
STOP
2
D99AU1033
D99AU1032
ACK
3
BYTE2
7
8
ACK
ACKNOWLEDGMENT
FROM RECEIVER
STOP
2
CBus, the more complete set
I
2
BYTE3
CBUS
9
ACK
TDA7476
STOP
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