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E-TDA7562

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
TDA7562
10/17
with the 4 ohm speaker unconnected is considered as double fault.
S. GND (so) / S. GND (sk) in the above table make a distinction according to which of the 2 outputs is shorted
to ground (test-current source side= so, test-current sink side = sk). More precisely, so = CH+, sk = CH-.
FAULTS AVAILABILITY
All the results coming from I2Cbus, by read operations, are the consequence of measurements inside a defined
period of time. If the fault is stable throughout the whole period, it will be sent out.
To guarantee always resident functions, every kind of diagnostic cycles will be reactivate after any I
2
C reading
operation. So, when the micro reads the I
2
C, a new cycle will be able to start, but the read data will come from
the previous diag. cycle (i.e. The device is in turned On, with a short to Gnd, then the short is removed and micro
reads I
2
C. The short to Gnd is still present in bytes, because it is the result of the previous cycle. If another I
2
C
reading operation occurs, the bytes do not show the short). In general to observe a change in Diagnostic bytes,
two I
2
C reading operations are necessary.
I
2
C PROGRAMMING/READING SEQUENCES
A correct turn on/off sequence respectful of the diagnostic timings and producing no audible noises could be as
follows (after battery connection):
TURN-ON: PIN2 > 7V --- 10ms --- (STAND-BY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT
TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STAND-BY IN) --- 10ms --- PIN2 = 0
Car Radio Installation: PIN2 > 7V --- 10ms DIAG ENABLE (write) --- 200 ms --- I
2
C read (repeat until All faults
disappear).
OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I
2
C reading (repeat I
2
C reading until
high-offset message disappears).
FAST MUTING
The muting time can be shortened to less than 1ms by setting (IB2) D5 = 1. This option can be useful in transient
battery situations (i.e. during car engine cranking) to quickly turnoff the amplifier for avoiding any audible effects
caused by noise/transients being injected by preamp stages.
Double fault table for Turn On Diagnostic
S. GND (so) S. GND (sk) S. Vs S. Across L.
S. GND (so) S. GND S. GND S. Vs + S. GND S. GND
S. GND (sk) / S. GND S. Vs S. GND
S. Vs / / S. Vs S. Vs
S. Across L. / / / S. Across L.
11/17
TDA7562
I
2
C BUS INTERFACE
Data transmission from microprocessor to the TDA7562 and viceversa takes place through the 2 wires I
2
C BUS inter-
face, consisting of the two lines SDA and SCL (pull-up resistors to positive supply voltage must be connected).
Data Validity
As shown by fig. 16, the data on the SDA line must be stable during the high period of the clock. The HIGH and
LOW state of the data line can only change when the clock signal on the SCL line is LOW.
Start and Stop Conditions
As shown by fig. 17 a start condition is a HIGH to LOW transition of the SDA line while SCL is HIGH. The stop
condition is a LOW to HIGH transition of the SDA line while SCL is HIGH.
Byte Format
Every byte transferred to the SDA line must contain 8 bits. Each byte must be followed by an acknowledge bit.
The MSB is transferred first.
Acknowledge
The transmitter* puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see fig. 18).
The receiver** the acknowledges has to pull-down (LOW) the SDA line during the acknowledge clock pulse, so
that the SDAline is stable LOW during this clock pulse.
* Transmitter
–master (P) when it writes an address to the TDA7562
– slave (TDA7562) when the P reads a data byte from TDA7562
** Receiver
– slave (TDA7562) when the P writes an address to the TDA7562
–master (P) when it reads a data byte from TDA7562
Figure 16. Data Validity on the I
2
CBUS
Figure 17. Timing Diagram on the I
2
CBUS
Figure 18. Acknowledge on the I
2
CBUS
SDA
SCL
DATA LINE
STABLE, DATA
VALID
CHANGE
DATA
ALLOWED
D99AU1031
SCL
SDA
START
I
2
CBUS
STOP
D99AU1032
SCL
1
MSB
23789
SDA
START
ACKNOWLEDGMENT
FROM RECEIVER
D99AU1033
TDA7562
12/17
SOFTWARE SPECIFICATIONS
All the functions of the TDA7562 are activated by I
2
C interface.
The bit 0 of the "ADDRESS BYTE" defines if the next bytes are write instruction (from
P to TDA7562) or read
instruction (from TDA7562 to
P).
Chip Address:
X = 0 Write to device
X = 1 Read from device
If R/W = 0, the
P sends 2 "Instruction Bytes": IB1 and IB2.
IB1
IB2
D7 D0
1101100XD8 Hex
D7 X
D6
Diagnostic enable (D6 = 1)
Diagnostic defeat (D6 = 0)
D5
Offset Detection enable (D5 = 1)
Offset Detection defeat (D5 = 0)
D4
Front Channel
Gain = 30dB (D4 = 0)
Gain = 16dB (D4 = 1)
D3
Rear Channel
Gain = 30dB (D3 = 0)
Gain = 16dB (D3 = 1)
D2
Mute front channels (D2 = 0)
Unmute front channels (D2 = 1)
D1
Mute rear channels (D1 = 0)
Unmute rear channels (D1 = 1)
D0
CD 2% (D0 = 0)
CD 10% (D0 = 1)
D7 X
D6 used for testing
D5
Normal muting time (D5 = 0)
Fast muting time (D5 = 1)
D4
Stand-by on - Amplifier not working - (D4 = 0)
Stand-by off - Amplifier working - (D4 = 1)
D3
Power amplifier mode diagnostic (D3 = 0)
Line driver mode diagnostic (D3 = 1)
D2 X
D1 X
D0 X
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

E-TDA7562

Mfr. #:
Buy E-TDA7562
Manufacturer:
STMicroelectronics
Description:
IC AMP AUDIO PWR 60W 27FLEXIWATT
Lifecycle:
New from this manufacturer.
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