4 x 40 W multifunction quad power amplifier
Features
■ DMOS power output
■ High output power capability 4 x 25 W/4 Ω @
14.4 V, 1 kHz, 10 % THD, 4 x 40 W max. power
■ Max. output power 4 x 60 W/2 Ω
■ Full I
■ Full fault protection
■ DC offset detection
■ Four independent short circuit protection
■ Clipping detector pin with selectable threshold
■ ESD protection
Description
The TDA7566 is a new BCD technology quad
bridge type of car radio amplifier in Flexiwatt25
package specially intended for car radio
applications.
Table 1. Device summary
2
C bus driving:
– Standby
– Independent front/rear soft play/mute
– Selectable gain 26 dB - 12 dB
2
–I
C bus digital diagnostics
(1%, 10%)
TDA7566
with built-in diagnostics features
Flexiwatt25
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 I
The possibility to control the configuration and
behavior of the device by means of the I
makes TDA7566 a very flexible product.
2
C bus.
2
C bus
Order code Package Packing
E-TDA7566 Flexiwatt25 Tube
TDA7566
1. Obsolete product.
October 2010 Doc ID 9801 Rev 5 1/29
(1)
Flexiwatt25 Tube
www.st.com
1
Contents TDA7566
Contents
1 Block diagram and application and test circuit . . . . . . . . . . . . . . . . . . . 5
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Diagnostics functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Turn-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
5 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2 Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7 Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2/29 Doc ID 9801Rev 5
TDA7566 List of tables
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
Doc ID 9801Rev 5 3/29
List of figures TDA7566
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 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Output power vs. supply voltage (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Distortion vs. output power (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Distortion vs. output power (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Distortion vs. frequency (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Distortion vs. frequency (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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/V
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 I
Figure 26. Timing diagram on the I
Figure 27. Timing acknowledge clock pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 28. Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2
C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2
C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
S
4/29 Doc ID 9801Rev 5
TDA7566 Block diagram and application and test circuit
1 Block diagram and application and test circuit
1.1 Block diagram
Figure 1. Block diagram
V
DATA CD_OUTCLK
CC1VCC2
IN RF
IN RR
IN LF
IN LR
REFERENCE
F
R
F
R
SVR RF RR LF LR TAB S_GNDAC_GND
D00AU1229
PROTECTION
& DUMP
MUTE1
1.2 Application and test circuit
I2C BUSTHERMAL
MUTE2
12/26dB
12/26dB
12/26dB
12/26dB
CLIP
DETECTOR
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
PW_GND
OUT RF+
OUT RF-
OUT RR+
OUT RR-
OUT LF+
OUT LF-
OUT LR+
OUT LR-
Figure 2. Application and test circuit
C8
0.1μFC73300μF
I2C BUS
DATA
CLK
C1 0.22μF
IN RF
C2 0.22μF
IN RR
C3 0.22μF
IN LF
C4 0.22μF
IN LR
25
22
15
14
11
12
S-GND
13
16 10 4
C5
1μFC610μF
Doc ID 9801Rev 5 5/29
Vcc1
620
Vcc2
CD OUT
47K
+
17
18
19
+
21
24
23
+
9
8
7
+
5
2
3
-
TAB
1
OUT RF
OUT RR
OUT LF
OUT LR
V
D00AU1212
Pin description TDA7566
2 Pin description
Figure 3. Pin connection (top view)
25
24
23
22
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
4
3
2
1
DATA
PW_GND RR
OUT RR-
CK
OUT RR+
V
CC2
OUT RF-
PW_GND RF
OUT RF+
AC GND
IN RF
IN RR
S GND
IN LR
IN LF
SVR
OUT LF+
PW_GND LF
OUT LF-
V
CC1
OUT LR+
CD-OUT
OUT LR-
PW_GND LR
TAB
D99AU1037
6/29 Doc ID 9801Rev 5
TDA7566 Electrical specifications
3 Electrical specifications
3.1 Absolute maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
T
V
V
peak
V
DATA
I
I
P
stg
Operating supply voltage 18 V
op
DC supply voltage 28 V
S
Peak supply voltage (for t = 50 ms) 50 V
CK pin voltage 6 V
CK
Data pin voltage 6 V
Output peak current (not repetitive t = 100 μs) 8 A
O
Output peak current (repetitive f > 10 Hz) 6 A
O
Power dissipation T
tot
= 70 °C 85 W
case
, TjStorage and junction temperature -55 to 150 °C
3.2 Thermal data
Table 3. Thermal data
Symbol Description Value Unit
R
th j-case
Thermal resistance junction-to-case Max. 1 °C/W
3.3 Electrical characteristics
Table 4. Electrical characteristics
(Refer to the test circuit, VS = 14.4 V; RL = 4 Ω; f = 1 kHz; GV = 26 dB; T
= 25 °C; unless
amb
otherwise specified.)
Symbol Parameter Test condition Min. Typ. Max. Unit
Power amplifier
V
Supply voltage range - 8 - 18 V
S
I
Total quiescent drain current - - 150 300 mA
d
Max. (VS = 14.4 V) 35 40 - W
P
O
Output power
THD = 10 %
THD = 1 %
= 2 Ω; EIAJ (VS = 13.7 V)
R
L
= 2 Ω; THD 10 %
R
L
= 2 Ω; THD 1 %
R
L
R
= 2 Ω; MAX POWER
L
Doc ID 9801Rev 5 7/29
22
16
50
32
25
55
25
20
55
38
30
60
-
-
W
W
W
W
W
W
Electrical specifications TDA7566
Table 4. Electrical characteristics (continued)
(Refer to the test circuit, VS = 14.4 V; RL = 4 Ω; f = 1 kHz; GV = 26 dB; T
= 25 °C; unless
amb
otherwise specified.)
Symbol Parameter Test condition Min. Typ. Max. Unit
P
= 1 W to 10 W - 0.04 0.1 %
O
THD Total harmonic distortion
C
Cross talk f = 1 kHz to 10 kHz, RG = 600 W 50 60 - dB
T
R
G
ΔG
G
E
E
Input impedance - 60 100 130 KΩ
IN
Voltage gain 1 - 25 26 27 dB
V1
Voltage gain match 1 - -1 0 1 dB
V1
Voltage gain 2 - - 12 - dB
V2
Output noise voltage 1 Rg = 600 Ω; 20 Hz to 22 kHz - 35 100 μV
IN1
Output noise voltage 2
IN2
SVR Supply voltage rejection
BW Power bandwidth - 100 - - KHz
= 12 dB;
G
V
= 0.1 to 5 V
V
O
R
= 600 Ω;
g
= 12 dB; 20 Hz to 22 kHz
G
V
RMS
f = 100 Hz to 10 kHz; V
= 600 Ω
R
g
= 1V pk;
r
- 0.02 0.05 %
-12-μV
50 60 - dB
A
V
V
T
T
CD
CD
Standby attenuation - 90 110 - dB
SB
Standby current - - 25 100 μA
I
SB
Mute attenuation - 80 100 - dB
A
M
Offset voltage Mute and Play -100 0 100 mV
OS
Min. supply voltage threshold - 7 7.5 8 V
AM
Turn on delay D2/D1 (IB1) 0 to 1 - 20 50 ms
ON
Turn off delay D2/D1 (IB1) 1 to 0 - 20 50 ms
OFF
Clip det high leakage current CD off - 0 15 μA
LK
Clip det sat. voltage CD on; ICD = 1mA - - 300 mV
SAT
D0 (IB1) = 0 0 1 2 %
CD
Clip det THD level
THD
D0 (IB1) = 1 5 10 15 %
Turn on diagnostics 1 (Power amplifier mode)
Short to GND det. (below this
Pgnd
limit, the Output is considered in
Short Circuit to GND)
Short to Vs det. (above this limit,
Pvs
the Output is considered in Short
Circuit to VS)
Power amplifier in standby
Normal operation
Pnop
thresholds.(Within these limits,
the Output is considered without
faults).
--1.2V
Vs -1.2 - - V
1.8 - Vs -1.8 V
8/29 Doc ID 9801Rev 5
TDA7566 Electrical specifications
Table 4. Electrical characteristics (continued)
(Refer to the test circuit, VS = 14.4 V; RL = 4 Ω; f = 1 kHz; GV = 26 dB; T
= 25 °C; unless
amb
otherwise specified.)
Symbol Parameter Test condition Min. Typ. Max. Unit
Lsc Shorted load det. - - - 0.5 Ω
Lop Open load det. - 85 - - Ω
Lnop Normal load det. - 1.65 - 45 Ω
Turn on diagnostics 2 (Line driver mode)
Short to GND det. (below this
Pgnd
Pvs
Pnop
Lsc Shorted load det. - - - 2 Ω
Lop Open load det. - 330 - - Ω
limit, the Output is considered in
Short Circuit to GND)
Short to Vs det. (above this limit,
the Output is considered in Short
Circuit to VS)
Normal operation thresholds.
(Within these limits, the Output is
considered without faults).
Power amplifier in standby
--1.2V
Vs -1.2 - - V
1.8 - Vs -1.8 V
Lnop Normal load det. - 7 - 180 Ω
Permanent diagnostics 2 (Power amplifier mode or line driver mode)
Pgnd
Short to GND det. (below this
limit, the Output is considered in
Short Circuit to GND)
Power amplifier in Mute or Play,
one or more short circuits
protection activated
--1.2V
Short to Vs det. (above this limit,
Pvs
the Output is considered in Short
- Vs -1.2 - - V
Circuit to VS)
Normal operation
Pnop
thresholds.(Within these limits,
the Output is considered without
- 1.8 - Vs -1.8 V
faults).
Power amplifier mode - - 0.5 Ω
L
2
I
C bus interface
f
V
Shorter Load det.
SC
V
Offset Detection
O
I
Normal load current detection
NL
Open load current detection - - 250 mA
I
OL
Clock frequency - - 400 - KHz
SCL
V
Input low voltage - - - 1.5 V
IL
Input high voltage - 2.3 - - V
IH
Line driver mode - - 2 Ω
Power amplifier in play, AC Input
signals = 0
1.522.5V
500 - - mA
VO < (VS - 5)pk
Doc ID 9801Rev 5 9/29
Electrical specifications TDA7566
(V)
(V)
(V)
(W)
(W)
(Hz)
3.4 Electrical characteristics curves
Figure 4. Quiescent current vs. supply
voltage
Id (mA)
250
230
210
190
170
150
130
110
90
70
50
Vin = 0
NO LOADS
8 1012141618
Vs
Figure 6. Output power vs. supply voltage
(2 Ω)
Po (W)
80
75
70
65
RL = 2 Ohm
60
f = 1 KHz
55
50
45
40
35
30
25
20
15
10
5
8 9 10 11 12 13 14 15 16
Vs
Po-max
THD= 10 %
THD= 1 %
Figure 5. Output power vs. supply voltage
(4 Ω)
Po (W)
70
65
60
55
50
45
40
35
30
25
20
15
10
5
RL = 4 Ohm
f = 1 KHz
8 9 10 11 12 13 14 15 16 17 18
Vs
Po-max
THD= 10 %
THD= 1 %
Figure 7. Distortion vs. output power (4 Ω)
THD (%)
10
Vs = 14.4 V
RL = 4 Ohm
1
f = 10 KHz
0.1
0.01
0.1 1 10
f = 1 KHz
Po
Figure 8. Distortion vs. output power (2 Ω) Figure 9. Distortion vs. frequency (4 Ω)
THD (%)
10
Vs = 14.4 V
RL = 2 Ohm
1
f = 10 KHz
0.1
0.01
0.1 1 10
f = 1 KHz
Po
10/29 Doc ID 9801Rev 5
THD (%)
10
Vs = 14.4 V
RL = 4 Ohm
Po = 4 W
1
0.1
0.01
10 100 1000 10000
f
TDA7566 Electrical specifications
(Hz)
(Hz)
(Hz)
(W)
(W)
(W)
Figure 10. Distortion vs. frequency (2 Ω) Figure 11. Crosstalk vs. frequency
10
THD (%)
CROSSTALK (dB)
90
Vs = 14.4 V
RL = 2 Ohm
Po = 8 W
1
0.1
0.01
10 100 1000 10000
f
Figure 12. Supply voltage rejection vs.
frequency
SVR (dB)
90
80
70
60
50
Rg = 600 Ohm
40
Vripple = 1 Vpk
30
20
10 100 1000 10000
f
80
70
60
Vs = 14.4 V
RL = 4 Ohm
50
Po = 4 W
Rg = 600 Ohm
40
30
20
10 100 1000 10000
Figure 13.
Power dissipation and efficiency vs.
output power (4
Ptot (W)
90
80
Vs = 14.4 V
RL = 4x4 Ohm
70
f= 1 KHz SINE
60
50
40
30
20
10
0
0 2 4 6 8 101214161820222426
Po
f
Ω
, Sine)
n
Ptot
n (%)
90
80
70
60
50
40
30
20
10
0
Figure 14.
Power dissipation vs. average output
power (audio program simulation, 4 Ω)
Ptot (W)
45
40
Vs = 14.4 V
35
RL = 4x4 Ohm
GAUSSIAN NOISE
30
25
20
15
10
5
012345
Po
CLIP
START
Doc ID 9801Rev 5 11/29
Figure 15.
Power dissipation vs. average output
power (audio program simulation, 2 Ω)
Ptot (W)
90
80
Vs = 14.4 V
70
RL = 4x2 Ohm
GAUSSIAN NOISE
60
50
40
30
20
10
0
012345678
Po
CLIP
START
Diagnostics functional description TDA7566
4 Diagnostics functional description
4.1 Turn-on diagnostic
It is activated at the turn-on (standby out) under I2C bus request. Detectable output faults
are:
– Short to GND
–Short to V
– Short across the speaker
– Open speaker
To 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
Turn On diagnostic status is internally stored until a successive diagnostic pulse is
requested (after a I
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.
S
2
C reading).
Figure 16. Turn-on diagnostic: working principle
Vs~5V
Isource
CH+
CH-
Isink
I (mA)
Isource
Isink
~100ms
Measure time
t (ms)
Figure 17 and 18 show SVR and output waveforms at the turn-on (standby out) with and
without Turn-on diagnostic.
12/29 Doc ID 9801Rev 5
TDA7566 Diagnostics functional description
Figure 17. SVR and output behavior (case 1: without turn-on diagnostic)
Vsvr
Out
Permanent diagnostic
acquisition time (100mS Typ)
Bias (power a mp turn-on)
I2CB DATA
Diagnostic Enable
(Permanent)
FAULT
event
Permanent Diagnostics data (output)
permitted time
Read Data
Figure 18. SVR and output pin behavior (case 2: with turn-on diagnostic)
Vsvr
Out
Diagnostic Enable
I2CB DATA
Turn-on diagnostic
acquisition time (100mS Typ)
(Turn-on)
Bias (power amp turn-on)
permitted time
Turn-on Diagnostics data (output)
permitted time
Read Data
Diagnostic Enable
(Permanent)
Permanent Diagnostics data (output)
Permanent diagnostic
acquisition time (100mS Typ)
FAULT
event
permitted time
t
t
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
26 dB to 12 dB gain setting. They are as follows:
Figure 19. Thresholds for short to GND/V
S.C. to GND x S.C. to Vs
0V 1.8V VS-1.8V V
1.2V VS-1.2V
Doc ID 9801Rev 5 13/29
S
xNormal Operation
D01AU1253
S
Diagnostics functional description TDA7566
Concerning short across the speaker / open speaker, the threshold varies from 26 dB to
12 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
S.C. across Load x Open Load
0V 1.65Ω
If the Line-Driver mode (G
0.5Ω
= 12 dB and Line Driver Mode diagnostic = 1) is selected, the
v
same thresholds will change as follows:
Figure 21. Thresholds for line-drivers
S.C. across Load x Open Load
0Ω 7Ω 180Ω infinite
2Ω 330Ω
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
45Ω
xNormal Operation
85Ω
xNormal Operation
D02AU1340
AC00566
Infinite
The TDA7566 has 2 operating statuses:
1. 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 I
2
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
14/29 Doc ID 9801Rev 5
TDA7566 Diagnostics functional description
an I2C 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
Out
1-2mS
1mS 1mS 1mS
1mS
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Figure 23. Restart timing with diagnostic enable (Permanent)
1mS 100mS 1mS1mS
Overcurrent and short
(i.e. short circuit to GND)
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 V
The test is run with selectable time duration by microprocessor (from a "start" to a "stop"
command):
Short circuit removed
t
t
Short circuit removed
= 0).
in
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.
Doc ID 9801Rev 5 15/29
Diagnostics functional description TDA7566
4.4 AC diagnostic
It is targeted at detecting accidental disconnection of tweeters in 2-way speaker and, more
in general, presence of capacitive (AC) coupled loads.
This diagnostic is based on the notion that the overall speaker's impedance (woofer +
parallel tweeter) will tend to increase towards high frequencies if the tweeter gets
disconnected, because the remaining speaker (woofer) would be out of its operating range
(high impedance). The diagnostic decision is made according to peak output current
thresholds, as follows:
I
> 500mApk = normal status
out
I
< 250mApk = open tweeter
out
To correctly implement this feature, it is necessary to briefly provide a signal tone (with the
amplifier in "play") whose frequency and magnitude are such to determine an output current
higher than 500mApk in normal conditions and lower than 250mApk should the parallel
tweeter be missing. The test has to last for a minimum number of 3 sine cycles starting from
the activation of the AC diagnostic function IB2<D2>) up to the I
(measuring period). To confirm presence of tweeter, it is necessary to find at least 3 current
pulses over 500mA over all the measuring period, else an "open tweeter" message will be
issued.
The frequency / magnitude setting of the test tone depends on the impedance
characteristics of each specific speaker being used, with or without the tweeter connected
(to be calculated case by case). High-frequency tones (> 10 KHz) or even ultrasonic signals
are recommended for their negligible acoustic impact and also to maximize the impedance
module's ratio between with tweeter-on and tweeter-off.
2
C reading of the results
Figure 24 shows the Load Impedance as a function of the peak output voltage and the
relevant diagnostic fields.
This feature is disabled if any overloads leading to activation of the short-circuit protection
occurs in the process.
Figure 24. Current detection: load impedance magnitude |Z| vs. output peak voltage
of the sinus
Load |z| (Ohm)
50
Low current detection area
30
20
10
5
3
2
1
(Open load)
D5 = 1 of the DBx byres
High current detection area
(Normal load)
D5 = 0 of the DBx bytes
12345678
Vout (Peak)
Iout (peak) <250m A
Iout (peak) >500m A
16/29 Doc ID 9801Rev 5
TDA7566 Diagnostics functional description
4.5 Multiple faults
When more misconnections are simultaneously in place at the audio outputs, it is
guaranteed that at least one of them is initially read out. The others are notified after
successive cycles of I
This is true for both kinds of diagnostic (Turn on and Permanent).
The table below shows all the couples of double-fault possible. It should be taken into
account that a short circuit with the 4 ohm speaker unconnected is considered as double
fault.
Table 5. Double fault table for turn-on diagnostic
2
C reading and faults removal, provided that the diagnostic is enabled.
S. GND (so) S. GND (sk) S. Vs S. Across L. Open L.
S. GND (so) S. GND S. GND
S. GND (sk) / S. GND S. Vs S. GND Open L. (*)
S. Vs / / S. Vs S. Vs S. Vs
S. Across L. / / / S. Across L. N.A.
Open L. / / / / Open L. (*)
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, in channels LF and LR, so = CH+, sk = CH-; in channels LR and RF, so = CH-, SK
= CH+.
In Permanent Diagnostic the table is the same, with only a difference concerning Open Load
(*), which is not among the recognizable faults. Should an Open Load be present during the
device's normal working, it would be detected at a subsequent Turn-on Diagnostic cycle (i.e.
at the successive Car Radio Turn-on).
4.6 Faults availability
All the results coming from I2C bus, 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. This is true for DC diagnostic (Turn-on and Permanent), for Offset
Detector, for AC Diagnostic (the low current sensor needs to be stable to confirm the Open
tweeter).
S. Vs + S.
GND
S. GND S. GND
To guarantee always resident functions, every kind of diagnostic cycles (Turn on,
Permanent, Offset, AC) will be reactivate after any I
micro reads the I
previous diag. cycle (i.e. The device is in Turn On state, with a short to Gnd, then the short is
removed and micro reads I
result of the previous cycle. If another I
2
C, a new cycle will be able to start, but the read data will come from the
2
C. The short to GND is still present in bytes, because it is the
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 operation. So, when the
2
C reading operations
are necessary.
Doc ID 9801Rev 5 17/29
Diagnostics functional description TDA7566
4.7 I2C programming/reading sequence
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: (STANDBY OUT + DIAG ENABLE) --- 500 ms (min) --- MUTING OUT
TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STANDBY IN)
Car Radio Installation: DIAG ENABLE (write) --- 200 ms --- I
disappear).
AC TEST: FEED H.F. TONE -- AC DIAG ENABLE (write) --- WAIT > 3 CYCLES --- I
(repeat I
2
C reading until tweeter-off message disappears).
OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I
2
I
C reading until high-offset message disappears).
2
C read (repeat until All faults
2
C read
2
C reading (repeat
18/29 Doc ID 9801Rev 5
TDA7566 I2C bus interface
5 I2C bus interface
Data transmission from microprocessor to the TDA7566 and vice versa takes place through
the 2 wires I
2
C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to
positive supply voltage must be connected).
5.1 Data validity
As shown by Figure 25, 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.
5.2 Start and stop conditions
As shown by Figure 26 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.
5.3 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.
5.4 Acknowledge
The transmitter* puts a resistive HIGH level on the SDA line during the acknowledge clock
pulse (see Figure 27). The receiver** the acknowledges has to pull-down (LOW) the SDA
line during the acknowledge clock pulse, so that the SDA line is stable LOW during this clock
pulse.
* Transmitter
– master (µP) when it writes an address to the TDA7566
– slave (TDA7566) when the µP reads a data byte from TDA7566
** Receiver
– slave (TDA7566) when the µP writes an address to the TDA7566
– master (µP) when it reads a data byte from TDA7566
Figure 25. Data validity on the I
SDA
SCL
2
C bus
DATA LINE
STABLE, DATA
VALID
Doc ID 9801Rev 5 19/29
CHANGE
DATA
ALLOWED
D99AU1031
I2C bus interface TDA7566
Figure 26. Timing diagram on the I2C bus
SCL
2
CBUS
I
SDA
START
D99AU1032
Figure 27. Timing acknowledge clock pulse
SCL
SDA
START
1
MSB
23789
D99AU1033
STOP
ACKNOWLEDGMENT
FROM RECEIVER
20/29 Doc ID 9801Rev 5
TDA7566 Software specifications
6 Software specifications
All the functions of the TDA7566 are activated by I2C interface.
The bit 0 of the "ADDRESS BYTE" defines if the next bytes are write instruction (from μP to
TDA7566) or read instruction (from TDA7566 to µP).
Chip address
D7 D0
1101100XD8 Hex
X = 0 Write to device
X = 1 Read from device
If R/W = 0, the μP sends 2 "Instruction Bytes": IB1 and IB2.
Table 6. IB1
Bit Instruction decoding bit
D7 0
D6
D5
D4
D3
D2
D1
D0
Diagnostic enable (D6 = 1)
Diagnostic defeat (D6 = 0)
Offset Detection enable (D5 = 1)
Offset Detection defeat (D5 = 0)
Front Channel
Gain = 26dB (D4 = 0)
Gain = 12dB (D4 = 1)
Rear Channel
Gain = 26dB (D3 = 0)
Gain = 12dB (D3 = 1)
Mute front channels (D2 = 0)
Unmute front channels (D2 = 1)
Mute rear channels (D1 = 0)
Unmute rear channels (D1 = 1)
CD 2% (D0 = 0)
CD 10% (D0 = 1)
Doc ID 9801Rev 5 21/29
Software specifications TDA7566
Table 7. IB2
Bit Instruction decoding bit
D7 0
D6 0
D5 0
D4
D3
D2
Standby on - Amplifier not working - (D4 = 0)
Standby off - Amplifier working - (D4 = 1)
Power amplifier mode diagnostic (D3 = 0)
Line driver mode diagnostic (D3 = 1)
Current detection diagnostic enabled (D2 = 1)
Current detection diagnostic defeat (D2 = 0)
D1 0
D0 0
If R/W = 1, the TDA7566 sends 4 "Diagnostics Bytes" to mP: DB1, DB2, DB3 and DB4.
Table 8. DB1
Bit Instruction decoding bit
D7 Thermal warning active (D7 = 1)
D6
D5
D4
Diag. cycle not activated or not terminated (D6 = 0)
Diag. cycle terminated (D6 = 1)
Channel LF
Current detection
Output peak current < 250mA - Open load (D5 = 1)
Output peak current > 500mA - Open load (D5 = 0)
Channel LF
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel LF
D3
Normal load (D3 = 0)
Short load (D3 = 1)
Channel LF
Turn-on diag.: No open load (D2 = 0)
D2
Open load detection (D2 = 1)
Offset diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel LF
D1
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel LF
D0
No short to GND (D1 = 0)
Short to GND (D1 = 1)
22/29 Doc ID 9801Rev 5
TDA7566 Software specifications
Table 9. DB2
Bit Instruction decoding bit
D7
D6
D5
D4
D3
D2
D1
D0
Offset detection not activated (D7 = 0)
Offset detection activated (D7 = 1)
Current sensor not activated (D6 = 0)
Current sensor activated (D6 = 1)
Channel LR
Current detection
Output peak current < 250mA - Open load (D5 = 1)
Output peak current > 500mA - Open load (D5 = 0)
Channel LR
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel LR
Normal load (D3 = 0)
Short load (D3 = 1)
Channel LR
Turn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Permanent diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel LR
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel LR
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Doc ID 9801Rev 5 23/29
Software specifications TDA7566
Table 10. DB3
Bit Instruction decoding bit
D7 Standby status (= IB1 - D4)
D6 Diagnostic status (= IB1 - D6)
Channel RF
D5
D4
D3
D2
D1
D0
Current detection
Output peak current < 250mA - Open load (D5 = 1)
Output peak current > 500mA - Open load (D5 = 0)
Channel RF
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel RF
Normal load (D3 = 0)
Short load (D3 = 1)
Channel RF
Turn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Permanent diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel RF
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel RF
No short to GND (D1 = 0)
Short to GND (D1 = 1)
24/29 Doc ID 9801Rev 5
TDA7566 Software specifications
Table 11. DB4
Bit Instruction decoding bit
D7 X
D6 X
Channel R
D5
D4
D3
D2
D1
D0
Current detection
Output peak current < 250 mA - Open load (D5 = 1)
Output peak current > 500 mA - Open load (D5 = 0)
Channel RR
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel RR
Normal load (D3 = 0)
Short load (D3 = 1)
Channel RR
Turn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Permanent diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel RR
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel RR
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Doc ID 9801Rev 5 25/29
Examples of bytes sequence TDA7566
7 Examples of bytes sequence
1 - Turn-on diagnostic - Write operation
Start Address byte with D0 = 0 ACK IB1 with D6 = 1 ACK IB2 ACK STOP
2 - Turn-on diagnostic - Read operation
Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK DB3 ACK DB4 ACK STOP
The delay from 1 to 2 can be selected by software, starting from 1ms
3a - Turn-on of the power amplifier with 26dB gain, mute on, diagnostic defeat.
Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP
X000000X XXX1X0XX
3b - Turn-off of the power amplifier
Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP
X0XXXXXX XXX0XXXX
4 - Offset detection procedure enable
Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP
XX1XX11X XXX1X0XX
5 - Offset detection procedure stop and reading operation (the results are valid only for the offset
detection bits (D2 of the bytes DB1, DB2, DB3, DB4).
Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK DB3 ACK DB4 ACK STOP
● The purpose of this test is to check if a D.C. offset (2V typ.) is present on the outputs, produced by
input capacitor with anomalous leakage current or humidity between pins.
● The delay from 4 to 5 can be selected by software, starting from 1ms
6 - Current detection procedure start (the AC inputs must be with a proper signal that depends on the
type of load)
Start Address byte with D0 = 0 ACK IB1 ACK IB2 ACK STOP
XX01111X XXX1X1XX
7 - Current detection reading operation (the results valid only for the current sensor detection bits - D5 of
the bytes DB1, DB2, DB3, DB4).
Start Address byte with D0 = 1 ACK DB1 ACK DB2 ACK DB3 ACK DB4 ACK STOP
● During the test, a sinus wave with a proper amplitude and frequency (depending on the loudspeaker
under test) must be present. The minimum number of periods that are needed to detect a normal
load is 5.
● The delay from 6 to 7 can be selected by software, starting from 1ms.
26/29 Doc ID 9801Rev 5
TDA7566 Package information
8 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
is an ST trademark.
Figure 28. Flexiwatt25 mechanical data and package dimensions
DIM.
A 4.45 4.50 4.65 0.175 0.177 0.183
B 1.80 1.90 2.00 0.070 0.074 0.079
C 1.40 0.055
D 0.75 0.90 1.05 0.029 0.035 0.041
E 0.37 0.39 0.42 0.014 0.015 0.016
F (1) 0.57 0.022
G 0.80 1.00 1.20 0.031 0.040 0.047
G1 23.75 24.00 24.25 0.935 0.945 0.955
H (2) 28.90 29.23 29.30 1.139 1 .150 1.153
H1 17.00 0.669
H2 12.80 0.503
H3 0.80 0.031
L (2) 22.07 22.47 22.87 0.869 0.884 0.904
L1 18.57 18.97 19.37 0.731 0.747 0.762
L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626
L3 7.70 7.85 7.95 0.303 0.309 0.313
L4 5 0.197
L5 3.5 0.138
M 3.70 4.00 4.30 0.145 0.157 0.169
M1 3.60 4.00 4.40 0.142 0.157 0.173
N 2.20 0.086
O 2 0.079
R 1.70 0.067
R1 0.5 0.02
R2 0.3 0.12
R3 1.25 0.049
R4 0.50 0.019
V5˚ (Tp.)
V1 3˚ (Typ.)
V2 20˚ (Typ.)
V3 45˚ (Typ.)
(1): dam-bar protusion not included
(2): molding pr otusion incl uded
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
OUTLINE AND
MECHANICAL DATA
Flexiwatt25 (vertical)
V
C
B
H
V3
OL3 L4
L2
Pin 1
H3
G
H1
G1
H2
R3
N
F
V
A
R4
R2
R
L
L1
V2
R2
V1
R1
L5
FLEX25ME
R1 R1
M1
M
V1
D
E
7034862
Doc ID 9801Rev 5 27/29
Revision history TDA7566
9 Revision history
Table 12. Document revision history
Date Revision Changes
20-Sep-2003 1 Initial release.
Document reformatted.
12-Jul-2006 2
18-Dec-2006 3 Updated Figure 20 and 21.
29-Sep-2008 4
11-Oct-2010 5 Modified Section Table 1.: Device summary on page 1.
Corrected the values of INL and IOL parameters in the Tab le 4 :
Electrical characteristics.
Updated Table 4: Electrical characteristics.
Updated Figure 20.
28/29 Doc ID 9801Rev 5
TDA7566
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Doc ID 9801Rev 5 29/29
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