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TDA7566
4 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
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
2
C bus driving:
– Standby
– Independent front/rear soft play/mute
– Selectable gain 26 dB - 12 dB
– I
2
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
Flexiwatt25
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
Order code
E-TDA7566
TDA7566
(1)
1.
Obsolete product.
Package
Flexiwatt25
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
2
C bus.
The possibility to control the configuration and behavior of the device by means of the I
2
C bus makes TDA7566 a very flexible product.
Packing
Tube
Tube
October 2010 Doc ID 9801 Rev 5 1/29
www.st.com
1
Contents
Contents
TDA7566
Block diagram and application and test circuit . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diagnostics functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
I2C programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/29 Doc ID 9801Rev 5
TDA7566
List of tables
List of tables
Doc ID 9801Rev 5 3/29
List of figures
List of figures
TDA7566
Output power vs. supply voltage (4
Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output power vs. supply voltage (2
Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Distortion vs. output power (4
Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Distortion vs. output power (2
Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power dissipation vs. average output power (audio program simulation, 4 W) . . . . . . . . . 11
Power dissipation vs. average output power (audio program simulation, 2 W) . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Current detection: load impedance magnitude |Z| vs. output peak voltage of the sinus. . . 16
C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2
C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4/29 Doc ID 9801Rev 5
TDA7566
1
Block diagram and application and test circuit
Block diagram and application and test circuit
1.2
Figure 1.
Block diagram
CLK DATA
REFERENCE
THERMAL
PROTECTION
& DUMP
I2C BUS
MUTE1 MUTE2
F
IN RF
IN RR
R
IN LF
IN LR
F
R
D00AU1229
SVR
V
CC1
V
CC2
CLIP
DETECTOR
CD_OUT
AC_GND
12/26dB
OUT RF+
OUT RF-
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
12/26dB
OUT RR+
OUT RR-
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
12/26dB
OUT LF+
OUT LF-
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
12/26dB
RF RR LF LR
OUT LR+
OUT LR-
SHORT CIRCUIT
PROTECTION &
DIAGNOSTIC
PW_GND
TAB S_GND
Application and test circuit
Figure 2.
Application and test circuit
C8
0.1
μF
DATA
I2C BUS
CLK
C1 0.22
μF
IN RF
C2 0.22
μF
IN RR
C3 0.22
μF
IN LF
C4 0.22
μF
IN LR
25
22
15
14
11
12
S-GND
13
16
1
C5
μF
C7
3300
μF
Vcc1
6
Vcc2
20
21
24
23
17
18
19
-
+
+
-
+
9
8
7
-
+
5
2
3
1
-
TAB
10 4
47K
C6
10
μF
CD OUT
V
OUT RF
OUT RR
OUT LF
OUT LR
D00AU1212
Doc ID 9801Rev 5 5/29
Pin description
Figure 3.
Pin connection (top view)
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
25
24
23
22
4
3
2
1
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
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
TDA7566
6/29 Doc ID 9801Rev 5
TDA7566 Electrical specifications
3.1 Absolute maximum ratings
Table 2.
Symbol
V op
V
S
V peak
V
CK
V
DATA
I
O
I
O
P tot
T stg
, T j
Absolute maximum ratings
Parameter
Operating supply voltage
DC supply voltage
Peak supply voltage (for t = 50 ms)
CK pin voltage
Data pin voltage
Output peak current (not repetitive t = 100
μs)
Output peak current (repetitive f > 10 Hz)
Power dissipation T case
= 70 °C
Storage and junction temperature
Table 3.
Symbol
Thermal data
Description
R th j-case
Thermal resistance junction-to-case
Value
8
6
6
6
18
28
50
85
-55 to 150
Unit
A
A
V
V
V
V
V
W
°C
Max.
Value
1
Unit
°C/W
Table 4.
Electrical characteristics
(Refer to the test circuit, V
S
= 14.4 V; R
L
= 4
Ω; f = 1 kHz; G
V
= 26 dB; T amb otherwise specified.)
= 25 °C; unless
Parameter Test condition Min.
Typ.
Max.
Unit Symbol
Power amplifier
V
S
I d
Supply voltage range
Total quiescent drain current
P
O
Output power
-
-
Max. (V
S
= 14.4 V)
THD = 10 %
THD = 1 %
R
L
R
L
= 2
Ω; EIAJ (V
S
= 13.7 V)
= 2
Ω; THD 10 %
R
L
R
L
= 2
Ω; THD 1 %
= 2
Ω; MAX POWER
8
-
35
22
16
50
32
25
55
-
150
40
25
20
55
38
30
60
18
300
-
-
-
V mA
W
W
W
W
W
W
W
Doc ID 9801Rev 5 7/29
Electrical specifications TDA7566
Table 4.
Symbol
Electrical characteristics (continued)
(Refer to the test circuit, V
S
= 14.4 V; R
L
= 4
Ω; f = 1 kHz; G
V
= 26 dB; T amb otherwise specified.)
= 25 °C; unless
Parameter Test condition Min.
Typ.
Max.
Unit
0.04
0.1
%
THD Total harmonic distortion
C
T
R
IN
G
V1
ΔG
V1
G
V2
E
IN1
E
IN2
Cross talk
Input impedance
Voltage gain 1
Voltage gain match 1
Voltage gain 2
Output noise voltage 1
Output noise voltage 2
SVR Supply voltage rejection
BW
A
SB
I
SB
A
M
V
OS
V
AM
T
ON
T
OFF
CD
LK
CD
SAT
Power bandwidth
Standby attenuation
Standby current
Mute attenuation
Offset voltage
Min. supply voltage threshold
Turn on delay
Turn off delay
Clip det high leakage current
Clip det sat. voltage
CD
THD
Clip det THD level
-
-
-
-
-
P
O
= 1 W to 10 W
G
V
= 12 dB;
V
O
= 0.1 to 5 V
RMS
f = 1 kHz to 10 kHz, R
G
= 600 W
-
R g
= 600
Ω; 20 Hz to 22 kHz
R g
= 600
Ω;
G
V
= 12 dB; 20 Hz to 22 kHz
f = 100 Hz to 10 kHz; V r
= 1V pk;
R g
= 600
Ω
Mute and Play
-
D2/D1 (IB1) 0 to 1
D2/D1 (IB1) 1 to 0
CD off
CD on; I
CD
= 1mA
D0 (IB1) = 0
D0 (IB1) = 1
-
-
50
-
-
100
-
100
8
50
50
15
300
2
15
-
110
25
100
0
7.5
20
20
0
-
1
10
100
90
-
80
-100
7
-
-
-
-
0
5
50
60
25
-1
-
-
0.02
60
100
26
0
12
35
12
60
0.05
-
130
27
1
-
100
-
-
% ms ms
μA mV
%
%
KHz dB
μA dB mV
V dB
K
Ω dB dB dB
μV
μV dB
Turn on diagnostics 1 (Power amplifier mode)
Pgnd
Pvs
Pnop
Short to GND det. (below this 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)
Power amplifier in standby
Normal operation thresholds.(Within these limits, the Output is considered without faults).
-
Vs -1.2
1.8
-
-
1.2
-
Vs -1.8
V
V
V
8/29 Doc ID 9801Rev 5
TDA7566 Electrical specifications
Table 4.
Symbol
Lsc
Electrical characteristics (continued)
(Refer to the test circuit, V
S
= 14.4 V; R
L
= 4
Ω; f = 1 kHz; G
V
= 26 dB; T amb otherwise specified.)
= 25 °C; unless
Parameter Test condition Min.
Typ.
Max.
Shorted load det.
Lop Open load det.
Lnop Normal load det.
-
-
-
85
1.65
-
-
0.5
-
45
Unit
Ω
Ω
Ω
Turn on diagnostics 2 (Line driver mode)
Pgnd
Short to GND det. (below this limit, the Output is considered in
Short Circuit to GND)
Pvs
Pnop
Short to Vs det. (above this limit, the Output is considered in Short
Circuit to VS)
Power amplifier in standby
Normal operation thresholds.
(Within these limits, the Output is considered without faults).
Lsc Shorted load det.
Lop Open load det.
-
-
Lnop Normal load det.
-
Permanent diagnostics 2 (Power amplifier mode or line driver mode)
-
Vs -1.2
1.8
-
330
7
-
-
-
-
-
1.2
-
Vs -1.8
2
-
180
V
V
V
Ω
Ω
Ω
Pgnd
Pvs
Pnop
L
V
SC
O
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
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).
-
Shorter Load det.
Offset Detection
Power amplifier mode
Line driver mode
Power amplifier in play, AC Input signals = 0
-
-
-
Vs -1.2
1.8
1.5
I
NL
I
OL
Normal load current detection
Open load current detection
I
2
C bus interface
V
O
< (V
S
- 5)pk
500
f
SCL
V
IL
V
IH
Clock frequency
Input low voltage
Input high voltage -
-
-
-
2.3
-
-
-
-
-
2
-
-
400
-
-
1.2
-
Vs -1.8
0.5
2
2.5
-
250
-
1.5
-
V
V
V
Ω
Ω
V mA mA
KHz
V
V
Doc ID 9801Rev 5 9/29
Electrical specifications TDA7566
Figure 4.
Quiescent current vs. supply voltage
130
110
90
70
50
8
250
Id (mA)
230
210
Vin = 0
NO LOADS
190
170
150
10 12
Vs (V)
14 16 18
Figure 6.
Output power vs. supply voltage
(2
Ω)
50
45
40
35
30
25
20
15
10
5
8
80
Po (W)
75
70
65
60
55
RL = 2 Ohm
f = 1 KHz
9 10
Po-max
THD= 10 %
THD= 1 %
11 12
Vs (V)
13 14 15 16
Figure 8.
Distortion vs. output power (2
Ω)
Figure 5.
Output power vs. supply voltage
(4
Ω)
45
40
35
30
25
20
15
10
5
8
70
Po (W)
65
60
55
50
9
RL = 4 Ohm
f = 1 KHz
10 11 12 13
Vs (V)
14 15
Po-max
THD= 10 %
16
THD= 1 %
17 18
Figure 7.
Distortion vs. output power (4
Ω)
10
THD (%)
1
Vs = 14.4 V
RL = 4 Ohm
0.1
f = 10 KHz f = 1 KHz
0.01
0.1
1
Po (W)
10
Figure 9.
Distortion vs. frequency (4
Ω)
10
THD (%)
1
Vs = 14.4 V
RL = 2 Ohm
10
THD (%)
Vs = 14.4 V
RL = 4 Ohm
Po = 4 W
1
0.1
f = 10 KHz f = 1 KHz
0.1
0.01
0.1
1
Po (W)
10
0.01
10 100 f (Hz)
1000 10000
10/29 Doc ID 9801Rev 5
TDA7566 Electrical specifications
Figure 10. Distortion vs. frequency (2
Ω)
Figure 11. Crosstalk vs. frequency
10
THD (%)
1
0.1
Vs = 14.4 V
RL = 2 Ohm
Po = 8 W
70
60
50
40
90
CROSSTALK (dB)
80
30
20
10
Vs = 14.4 V
RL = 4 Ohm
Po = 4 W
Rg = 600 Ohm
100
0.01
10 100 f (Hz)
1000 10000 f (Hz)
1000 10000
Figure 12. Supply voltage rejection vs. frequency
70
60
50
90
SVR (dB)
80
40
30
20
10
Rg = 600 Ohm
Vripple = 1 Vpk
20
10
0
0
60
50
40
30
90
Ptot (W)
80
70
Vs = 14.4 V
RL = 4x4 Ohm
f= 1 KHz SINE
2 4 6 8 n n (%)
90
80
70
Ptot
10 12 14 16 18 20 22 24 26
Po (W)
0
20
10
60
50
40
30
100 f (Hz)
1000 10000
Figure 14.
Power dissipation vs. average output power (audio program simulation, 4
Ω)
Figure 15.
Power dissipation vs. average output power (audio program simulation, 2
Ω)
25
20
15
10
5
0
35
30
45
Ptot (W)
40
Vs = 14.4 V
RL = 4x4 Ohm
GAUSSIAN NOISE
1
CLIP
START
2
Po (W)
3 4 5
Figure 13.
Power dissipation and efficiency vs. output power (4
Ω, Sine)
30
20
10
0
0
60
50
40
90
Ptot (W)
80
70
Vs = 14.4 V
RL = 4x2 Ohm
GAUSSIAN NOISE
1 2
CLIP
START
3 4
Po (W)
5 6 7 8
Doc ID 9801Rev 5 11/29
Diagnostics functional description
4 Diagnostics functional description
TDA7566
It is activated at the turn-on (standby out) under I
2
C bus request. Detectable output faults are:
– Short to GND
– Short to V
S
– Short across the speaker
– Open speaker
To verify if any of the above misconnections are in place, a subsonic (inaudible) current pulse (
) 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
2
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
Isource
Vs~5V
CH+
CH-
I (mA)
Isource
Isink
Isink
~100ms
Measure time t (ms)
and
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 amp turn-on)
Diagnostic Enable
(Permanent)
FAULT event
Permanent Diagnostics data (output) permitted time
Read Data
I2CB DATA
Figure 18.
SVR and output pin behavior (case 2: with turn-on diagnostic)
Vsvr
Out
Turn-on diagnostic acquisition time (100mS Typ) Permanent diagnostic acquisition time (100mS Typ) t t
Diagnostic Enable
(Turn-on)
Turn-on Diagnostics data (output) permitted time
Diagnostic Enable
(Permanent)
FAULT event
Bias (power amp turn-on) permitted time
Read Data
Permanent Diagnostics data (output) permitted time
I2CB DATA
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
S.C. to GND x Normal Operation x S.C. to Vs
0V 1.2V
1.8V
V
S
-1.8V
V
S
-1.2V
D01AU1253
V
S
Doc ID 9801Rev 5 13/29
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 Normal Operation x Open Load
0V 0.5
Ω
1.65
Ω
45
Ω
85
Ω
AC00566
Infinite
If the Line-Driver mode (G v
= 12 dB and Line Driver Mode diagnostic = 1) is selected, the same thresholds will change as follows:
Figure 21.
Thresholds for line-drivers
S.C. across Load x Normal Operation x Open Load
0
Ω
2
Ω
7
Ω
180
Ω
330
Ω
D02AU1340 infinite
14/29
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:
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 (
).
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 (
– 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
Doc ID 9801Rev 5
TDA7566 Diagnostics functional description
an I
2
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
Out
1-2mS
1mS 1mS 1mS
1mS
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Short circuit removed t
Figure 23.
Restart timing with diagnostic enable (Permanent)
1mS 100mS 1mS 1mS
4.3
Overcurrent and short
(i.e. short circuit to GND) t
Short circuit removed
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 in
= 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.
Doc ID 9801Rev 5 15/29
Diagnostics functional description TDA7566
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 out
> 500mApk = normal status
I out
< 250mApk = open tweeter
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
2
C reading of the results
(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.
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
30
20
Low current detection area
(Open load)
D5 = 1 of the DBx byres
Iout (peak) <250mA
Iout (peak) >500mA
10
High current detection area
(Normal load)
D5 = 0 of the DBx bytes
5
3
2
1
1 2 3 4
Vout (Peak)
5 6 7 8
16/29 Doc ID 9801Rev 5
TDA7566 Diagnostics functional description
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
2
C reading and faults removal, provided that the diagnostic is enabled.
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
S. GND (so) S. GND (sk) S. Vs
S. GND (so)
S. GND
S. GND (sk)
/
S. GND
S. GND
S. Vs + S.
GND
S. Vs
S. Vs
/ / S. Vs
S. Across L.
/
Open L.
/ /
/
/
/
S. Across L.
S. GND
S. GND
S. Vs
S. Across L.
/
Open L.
S. GND
Open L. (*)
S. Vs
N.A.
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).
All the results coming from I
2
C 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).
To guarantee always resident functions, every kind of diagnostic cycles (Turn on,
Permanent, Offset, AC) 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 Turn On state, 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.
Doc ID 9801Rev 5 17/29
Diagnostics functional description TDA7566
4.7 I
2
C 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
2
C read (repeat until All faults disappear).
AC TEST: FEED H.F. TONE -- AC DIAG ENABLE (write) --- WAIT > 3 CYCLES --- I
2
C read
(repeat I
2
C reading until tweeter-off message disappears).
OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I
2
C reading (repeat
I
2
C reading until high-offset message disappears).
18/29 Doc ID 9801Rev 5
TDA7566
5 I
2
C bus interface
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).
5.2
As shown by
, 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
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.
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
). 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
2
C bus
SDA
SCL
DATA LINE
STABLE, DATA
VALID
CHANGE
DATA
ALLOWED D99AU1031
Doc ID 9801Rev 5 19/29
I2C bus interface
Figure 26.
Timing diagram on the I
2
C bus
SCL
SDA
D99AU1032
START
Figure 27.
Timing acknowledge clock pulse
SCL
1 2 3
SDA
MSB
START
D99AU1033
7
STOP
8 9
I
2
CBUS
ACKNOWLEDGMENT
FROM RECEIVER
TDA7566
20/29 Doc ID 9801Rev 5
TDA7566 Software specifications
All the functions of the TDA7566 are activated by I
2
C 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
D0
X D8 Hex
D7
1 1 0 1 1 0
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.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
IB1
Instruction decoding bit
0
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)
0
Doc ID 9801Rev 5 21/29
Software specifications TDA7566
Table 7.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
IB2
Instruction decoding bit
0
0
0
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)
0
0
Current detection diagnostic enabled (D2 = 1)
Current detection diagnostic defeat (D2 = 0)
If R/W = 1, the TDA7566 sends 4 "Diagnostics Bytes" to mP: DB1, DB2, DB3 and DB4.
Table 8.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
DB1
Instruction decoding bit
Thermal warning active (D7 = 1)
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
Normal load (D3 = 0)
Short load (D3 = 1)
Channel LF
Turn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Offset diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel LF
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel LF
No short to GND (D1 = 0)
Short to GND (D1 = 1)
22/29 Doc ID 9801Rev 5
TDA7566
Table 9.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
DB2
Instruction decoding bit
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)
Software specifications
Doc ID 9801Rev 5 23/29
Software specifications
Table 10.
DB3
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Instruction decoding bit
Standby status (= IB1 - D4)
Diagnostic status (= IB1 - D6)
Channel RF
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)
TDA7566
24/29 Doc ID 9801Rev 5
TDA7566
Table 11.
DB4
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Instruction decoding bit
X
X
Channel R
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)
Software specifications
Doc ID 9801Rev 5 25/29
Examples of bytes sequence
7 Examples of bytes sequence
TDA7566
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
X000000X XXX1X0XX
3b - Turn-off of the power amplifier
Start Address byte with D0 = 0 ACK IB1
X0XXXXXX
ACK IB2
XXX0XXXX
ACK STOP
ACK STOP
4 - Offset detection procedure enable
Start Address byte with D0 = 0 ACK IB1
XX1XX11X
ACK IB2
XXX1X0XX
ACK STOP
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
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
B
C
D
E
F (1)
4.45
1.80
mm
4.50
1.90
4.65
2.00
0.175
0.070
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
0.177
0.074
0.183
0.079
1.40
0.055
0.75
0.90
1.05
0.029
0.035
0.041
0.37
0.39
0.42
0.57
0.014
0.015
0.016
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
H2
17.00
12.80
0.669
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
L5
5
3.5
0.197
0.138
M
M1
N
O
R
R1
R2
3.70
4.00
4.30
0.145
0.157
0.169
3.60
4.00
4.40
0.142
0.157
0.173
2.20
2
1.70
0.5
0.3
R3
R4
V
V1
V2
1.25
0.50
5˚ (T p.)
3˚ (Typ.)
20˚ (Typ.)
V3 45˚ (Typ.)
(1): dam-bar protusion not included
(2): molding protusion included
0.086
0.079
0.067
0.02
0.12
0.049
0.019
OUTLINE AND
MECHANICAL DATA
Flexiwatt25 (vertical)
V
C
B
V
H
H1
V3
H3
R3
H2
A
R4
V1
N
R
R2
L L1
V1
V2
Pin 1
G
G1
F
R2
FLEX25ME
L5
R1
D
R1
M
R1
E
M1
7034862
Doc ID 9801Rev 5 27/29
Revision history TDA7566
Table 12.
Document revision history
Date Revision
20-Sep-2003
12-Jul-2006
18-Dec-2006
29-Sep-2008
11-Oct-2010
1
2
3
4
5
Changes
Initial release.
Document reformatted.
Corrected the values of I
NL
and I
OL
parameters in the
Updated
Updated
Table 4: Electrical characteristics
.
Updated
Modified
Section Table 1.: Device summary on page 1
28/29 Doc ID 9801Rev 5
TDA7566
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Doc ID 9801Rev 5 29/29
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