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E-TDA7566
Intelligent quad BTL output with full I2C diagnostics
September 2013 Doc ID 9801 Rev 6 1/29
TDA75664 x 40 W multifunction quad power amplifier
with built-in diagnostics features
Features DMOS power output High output power capability 4 x 25 W/4 @
14.4 V, 1 kHz, 10 % THD, 4 x 40 W max. power Max. output power 4 x 60 W/2 Full I2 C bus driving: Standby Independent front/rear soft play/mute Selectable gain 26 dB - 12 dB2 C bus digital diagnostics Full fault protection DC offset detection Four independent short circuit protection Clipping detector pin with selectable threshold
(1%, 10%) ESD protection
DescriptionThe TDA7566 is a new BCD technology quad
bridge type of car radio amplifier in Flexiwatt25
package specially intended for car radio
applications.
Thanks to the DMOS output stage the TDA7566
has a very low distortion allowing a clear powerful
sound.
This device is equipped with a full diagnostics
array that communicates the status of each
speaker through the I2 C bus.
The possibility to control the configuration and
behavior of the device by means of the I2 C bus
makes TDA7566 a very flexible product.
Table 1. Device summary Obsolete product.
Contents TDA75662/29 Doc ID 9801 Rev 6
Contents Block diagram and application and test circuit . . . . . . . . . . . . . . . . . . . 51.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diagnostics functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124.1 T urn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Permanent diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Output DC offset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 AC diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5 Multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6 Faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7 I2C programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.1 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2 Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
TDA7566 List of tables
Doc ID 9801 Rev 6 3/29
List of tables
Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Double fault table for turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 6. IB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 7. IB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 8. DB1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 9. DB2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 10. DB3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 11. DB4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 12. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
List of figures TDA7566
4/29 Doc ID 9801 Rev 6
List of figures
Figure 1. Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Output power vs. supply voltage (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Output power vs. supply voltage (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Distortion vs. output power (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Distortion vs. output power (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Distortion vs. frequency (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Distortion vs. frequency (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 11. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 13. Power dissipation and efficiency vs. output power (4 W, Sine) . . . . . . . . . . . . . . . . . . . . . 11
Figure 14. Power dissipation vs. average output power (audio program simulation, 4 W) . . . . . . . . . 11
Figure 15. Power dissipation vs. average output power (audio program simulation, 2 W) . . . . . . . . . 11
Figure 16. Turn - on diagnostic: working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 17. SVR and output behavior (case 1: without turn-on diagnostic). . . . . . . . . . . . . . . . . . . . . . 13
Figure 18. SVR and output pin behavior (case 2: with turn-on diagnostic) . . . . . . . . . . . . . . . . . . . . . 13
Figure 19. Thresholds for short to GND/VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 20. Thresholds for short across the speaker/open speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 21. Thresholds for line-drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 22. Restart timing without diagnostic enable (Permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 23. Restart timing with diagnostic enable (Permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 24. Current detection: load impedance magnitude |Z| vs. output peak voltage of the sinus. . . 16
Figure 25. Data validity on the I2 C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 26. Timing diagram on the I2 C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 27. Timing acknowledge clock pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 28. Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
TDA7566 Block diagram and application and test circuit
Doc ID 9801 Rev 6 5/29 Block diagram and application and test circuit
1.1 Block diagram
Figure 1. Block diagram
1.2 Application and test circuit
Figure 2. Application and test circuit
Pin description TDA7566
6/29 Doc ID 9801 Rev 6
2 Pin description
Figure 3. Pin connection (top view)
TDA7566 Electrical specifications
Doc ID 9801 Rev 6 7/29
3 Electrical specifications
3.1 Absolute maximum ratings
3.2 Thermal data
3.3 Electrical characteristics
Table 2. Absolute maximum ratings
Table 3. Thermal data
Table 4. Electrical characteristics
(Refer to the test circuit, VS = 14.4 V; RL = 4 ; f = 1 kHz; GV = 26 dB; Tamb = 25 °C; unless
otherwise specified.)
Electrical specifications TDA7566
8/29 Doc ID 9801 Rev 6
Table 4. Electrical characteristics (continued)
(Refer to the test circuit, VS = 14.4 V; RL = 4 ; f = 1 kHz; GV = 26 dB; Tamb = 25 °C; unless
otherwise specified.)
TDA7566 Electrical specifications
Doc ID 9801 Rev 6 9/29
Table 4. Electrical characteristics (continued)
(Refer to the test circuit, VS = 14.4 V; RL = 4 ; f = 1 kHz; GV = 26 dB; Tamb = 25 °C; unless
otherwise specified.)
Electrical specifications TDA7566
3.4 Electrical characteristics curves
Figure 4. Quiescent current vs. supply
voltage
Figure 5. Output power vs. supply voltage )
Figure 6. Output power vs. supply voltage)
Figure 7. Distortion vs. output power (4 )
Figure 8. Distortion vs. output power (2 ) Figure 9. Distortion vs. frequency (4 )
TDA7566 Electrical specifications
Figure 10. Distortion vs. frequency (2 ) Figure 11. Crosstalk vs. frequency
Figure 12. Supply voltage rejection vs.
frequency
Figure 13. Power dissipation and efficiency vs.
output power (4 , Sine)
Figure 14. Power dissipation vs. average output
power (audio program simulation, 4 )
Figure 15. Power dissipation vs. average output
power (audio program simulation, 2 )
Diagnostics functional description TDA7566 Doc ID 9801 Rev 6 Diagnostics functional description
4.1 Turn-on diagnostic
It is activated at the turn-on (standby out) under I2 C bus request. Detectable output faults
are: Short to GND
–Short to VS Short across the speaker Open speaker o verify if any of the above misconnections are in place, a subsonic (inaudible) current
pulse (Figure 16) is internally generated, sent through the speaker(s) and sunk back.The urn On diagnostic status is internally stored until a successive diagnostic pulse is
requested (after a I2 C reading).
If the "standby out" and "diag. enable" commands are both given through a single
programming step, the pulse takes place first (power stage still in standby mode, low,
outputs = high impedance).
Afterwards, when the Amplifier is biased, the PERMANENT diagnostic takes place. The
previous Turn On state is kept until a short appears at the outputs.
Figure 16. Turn-on diagnostic: working principle
Figure 17 and 18 show SVR and output waveforms at the turn-on (standby out) with and
without Turn-on diagnostic.
TDA7566 Diagnostics functional description
Doc ID 9801 Rev 6 13/29
Figure 17. SVR and output behavior (case 1: without turn-on diagnostic)
Figure 18. SVR and output pin behavior (case 2: with turn-on diagnostic)
The information related to the outputs status is read and memorized at the end of the
current pulse top. The acquisition time is 100 ms (typ.). No audible noise is generated in the
process. As for short to GND / Vs the fault-detection thresholds remain unchanged from dB to 12 dB gain setting. They are as follows:
Figure 19. Thresholds for short to GND/VS
Diagnostics functional description TDA7566
14/29 Doc ID 9801 Rev 6
Concerning short across the speaker / open speaker, the threshold varies from 26 dB to dB gain setting, since different loads are expected (either normal speaker's impedance
or high impedance). The values in case of 26 dB gain are as follows:
Figure 20. Thresholds for short across the speaker/open speaker
If the Line-Driver mode (Gv = 12 dB and Line Driver Mode diagnostic = 1) is selected, the
same thresholds will change as follows:
Figure 21. Thresholds for line-drivers
4.2 Permanent diagnostics
Detectable conventional faults are: short to GND short to Vs short across the speaker
The following additional features are provided: output offset detection AC diagnostic
The TDA7566 has 2 operating statuses: Restart mode. The diagnostic is not enabled. Each audio channel operates
independently from each other. If any of the a.m. faults occurs, only the channel(s)
interested is shut down. A check of the output status is made every 1 ms (Figure 22).
Restart takes place when the overload is removed.
2. Diagnostic mode. It is enabled via I2 C bus and self activates if an output overload (such
to cause the intervention of the short-circuit protection) occurs to the speakers outputs.
Once activated, the diagnostics procedure develops as follows (Figure 23): To avoid momentary re-circulation spikes from giving erroneous diagnostics, a
check of the output status is made after 1ms: if normal situation (no overloads) is
detected, the diagnostic is not performed and the channel returns back active. Instead, if an overload is detected during the check after 1 ms, then a diagnostic
cycle having a duration of about 100 ms is started. After a diagnostic cycle, the audio channel interested by the fault is switched to
Restart mode. The relevant data are stored inside the device and can be read by
the microprocessor. When one cycle has terminated, the next one is activated by
TDA7566 Diagnostics functional description
Doc ID 9801 Rev 6 15/29
an I2 C reading. This is to ensure continuous diagnostics throughout the car-radio
operating time. To check the status of the device a sampling system is needed. The timing is
chosen at microprocessor level (over half a second is recommended).
Figure 22. Restart timing without diagnostic enable (Permanent)
each 1 ms time, a sampling of the fault is done
Figure 23. Restart timing with diagnostic enable (Permanent)
4.3 Output DC offset detection
Any DC output offset exceeding ±2 V are signalled out. This inconvenient might occur as a
consequence of initially defective or aged and worn-out input capacitors feeding a DC
component to the inputs, so putting the speakers at risk of overheating.
This diagnostic has to be performed with low-level output AC signal (or Vin = 0).
The test is run with selectable time duration by microprocessor (from a "start" to a "stop"
command):
START = Last reading operation or setting IB1 - D5 - (OFFSET enable) to 1
STOP = Actual reading operation
Excess offset is signalled out if persistent throughout the assigned testing time. This feature
is disabled if any overloads leading to activation of the short-circuit protection occurs in the
process.
