STMICROELECTRONICS TDA7562B

TDA7562B
4 x 46 W multifunction quad power amplifier
with built-in diagnostics features
Features
■
MOSFET output power stage
■
High output power capability 4 x 25 W/4 Ω @
14.4 V, 1 kHz, 10 % THD
■
Max. output power 4 x 68 W/2 Ω, 4 x 42 W/4 Ω
@ 14.4 V
■
Full I2C bus driving:
– Standby
– Independent front/rear soft play/mute
– Selectable gain 30 dB - 16 dB
– I2C bus digital diagnostics
■
Full fault protection
■
DC offset detection
■
Four independent short circuit protection
■
Clipping detector (2 % / 10 %)
■
Standby/mute pin
■
ESD protection
Flexiwatt27
Thanks to the DMOS output stage the TDA7562B
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 I2C bus.
Description
The TDA7562B is a new BCD technology quad
bridge type of car radio amplifier in Flexiwatt27
package specially intended for car radio
applications.
Table 1.
'!0'03
The possibility to control the configuration and
behavior of the device by means of the I2C bus
makes TDA7562B a very flexible machine.
Device summary
Order code
Package
Packing
TDA7562B
Flexiwatt27
Tube
February 2011
Doc ID 17984 Rev 2
1/30
www.st.com
1
Contents
TDA7562B
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
4
5
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Diagnostics functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1
Turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2
Permanent diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3
Output DC offset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4
AC diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5
Multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6
Faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7
I2C Programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8
Fast muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1
Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2
Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.3
Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.4
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6
Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7
Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2/30
Doc ID 17984 Rev 2
TDA7562B
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Double fault table for turn on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
IB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DB4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Doc ID 17984 Rev 2
3/30
List of figures
TDA7562B
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
4/30
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Output power vs. supply voltage (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output power vs. supply voltage (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Distortion vs. output power (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Distortion vs. output power (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Distortion vs. frequency (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Distortion vs. frequency (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power dissipation and efficiency vs. output power (4 W, SINE) . . . . . . . . . . . . . . . . . . . . . 12
Power dissipation vs. average output power (audio program simulation, 4 W) . . . . . . . . . 12
Power dissipation vs. average output power (audio program simulation, 2 W) . . . . . . . . . 12
Turn-on diagnostic: working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SVR and output behavior (case 1: without turn-on diagnostic). . . . . . . . . . . . . . . . . . . . . . 14
SVR and output pin behavior (case 2: with turn-on diagnostic) . . . . . . . . . . . . . . . . . . . . . 14
Thresholds for short to GND/VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thresholds for short across the speaker/open speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Thresholds for line-drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Restart timing without diagnostic enable (permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Restart timing with diagnostic enable (permanent). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Current detection: Load impedance magnitude |Z| Vs. output peak voltage of the sinus. . 17
Data validity on the I2C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Timing diagram on the I2C Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Timing acknowledge clock pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Doc ID 17984 Rev 2
TDA7562B
Block diagram and application and test circuit
1
Block diagram and application and test circuit
1.1
Block diagram
Figure 1.
Block diagram
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'!0'03
Application and test circuit
Figure 2.
Application and test circuit
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Doc ID 17984 Rev 2
/54,2
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6
'!0'03
5/30
Pin description
2
Pin description
Figure 3.
6/30
TDA7562B
Pin connection (top view)
4!"
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07?'.$22
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Doc ID 17984 Rev 2
'!0'03
TDA7562B
Electrical specifications
3
Electrical specifications
3.1
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Value
Unit
Vop
Operating supply voltage
18
V
VS
DC supply voltage
28
V
Vpeak
Peak supply voltage (for t = 50 ms)
50
V
VCK
CK pin voltage
6
V
Data pin voltage
6
V
IO
Output peak current (not repetitive t = 100 μs)
8
A
IO
Output peak current (repetitive f > 10 Hz)
6
A
Power dissipation Tcase = 70 °C
85
W
Storage and junction temperature
-55 to 150
°C
Operative temperature range
-40 to 105
°C
Value
Unit
1
°C/W
VDATA
Ptot
Tstg, Tj
Top
3.2
Parameter
Thermal data
Table 3.
Symbol
Rth j-case
Thermal data
Description
Thermal resistance junction-to-case
Doc ID 17984 Rev 2
Max.
7/30
Electrical specifications
3.3
TDA7562B
Electrical characteristics
Refer to the test circuit, VS = 14.4 V; RL = 4 Ω; f = 1 kHz; GV = 30 dB; Tamb = 25 °C; unless
otherwise specified.
Table 4.
Electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Power amplifier
VS
Supply voltage range
-
8
-
18
V
Id
Total quiescent drain current
-
--
150
300
mA
Max. (VS = 15.2 V)
-
46
-
W
THD = 10 %
THD = 1 %
Max power
24
18
37
27
22
42
-
W
RL = 2 Ω; THD 10%
RL = 2 Ω; THD 1%
RL = 2 Ω; max. power
38
30
60
45
36
70
-
W
PO = 1 W to 10 W;
-
0.04
0.1
%
Total harmonic distortion
GV = 16 dB;
VO = 0.1 to 5 VRMS
-
0.02
0.05
%
CT
Cross talk
f = 1 kHz to 10 kHz, RG = 600 Ω
50
60
-
dB
RIN
Input impedance
-
60
100
130
kΩ
GV1
Voltage gain 1
-
29
30
31
dB
Voltage gain match 1
-
-1
0
1
dB
GV2
Voltage gain 2
-
15
16
17
dB
EIN1
Output noise voltage 1
Rg = 600 Ω; 20 Hz to 22 kHz
-
60
100
μV
EIN2
Output noise voltage 2
Rg = 600 Ω;
GV = 16 dB; 20 Hz to 22 kHz
-
20
30
μV
SVR
Supply voltage rejection
f = 100 Hz to 10 kHz; Vr = 1 Vpk;
Rg = 600 Ω
50
60
-
dB
BW
Power bandwidth
-
100
-
-
kHz
VSBY
Standby/mute pin for standby
-
0
-
1.5
V
VMU
Standby/mute pin for mute
-
3.5
-
5
V
VOP
Standby/mute pin for operating
-
7
-
VS
V
ASB
Standby attenuation
-
90
110
-
dB
ISB
Standby current
VSBY = 0V
-
1
10
μA
AM
Mute attenuation
-
80
100
-
dB
VOS
Offset voltage
Mute and play
-100
0
100
mV
VAM
Min. supply voltage threshold
-
6.5
7.5
8
V
TON
Turn on delay
D2/D1 (IB1) 0 to 1
8
20
50
ms
TOFF
Turn off delay
D2/D1 (IB1) 1 to 0
8
20
50
ms
PO
THD
ΔGV1
8/30
Output power
Doc ID 17984 Rev 2
TDA7562B
Table 4.
Symbol
Electrical specifications
Electrical characteristics (continued)
Parameter
Test condition
Min.
Typ.
Max.
Unit
CDLK
Clip det high leakage current
CD off
-
0
5
μA
CDSAT
Clip det sat. voltage
CD on; ICD = 1 mA
-
-
300
mV
CDTHD
Clip det THD level
D0 (IB1) = 0
0.5
2
3
%
D0 (IB1) = 1
5
10
15
%
-
-
1.2
V
Vs -1.2
-
-
V
1.8
-
Vs -1.8
V
Turn on diagnostics 1 (power amplifier mode)
Pgnd
Short to GND det. (below this
limit, the output is considered in
short circuit to GND)
Pvs
Short to Vs det. (above this limit,
the output is considered in short
circuit to VS)
Pnop
Power amplifier in standby
Normal operation thresholds.
(Within these limits, the output is Power amplifier in standby
considered without faults).
Lsc
Shorted load det.
-
-
-
0.5
Ω
Lop
Open load det.
-
85
-
-
Ω
Lnop
Normal load det.
-
1.5
-
45
Ω
-
-
1.2
V
Vs -1.2
-
-
V
1.8
-
Vs -1.8
V
Turn on diagnostics 2 (line driver 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 Power amplifier in standby
circuit to VS)
Normal operation thresholds.
(within these limits, the output is
considered without faults).
Lsc
Shorted load det.
-
-
-
2
Ω
Lop
Open load det.
-
330
-
-
Ω
Lnop
Normal load det.
-
7
-
180
Ω
-
-
1.2
V
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
Pvs
Short to Vs det. (above this limit,
the output is considered in short circuit to VS)
Vs -1.2
-
-
V
Pnop
Normal operation thresholds.
(Within these limits, the output is considered without faults).
1.8
-
Vs -1.8
V
Doc ID 17984 Rev 2
9/30
Electrical specifications
Table 4.
TDA7562B
Electrical characteristics (continued)
Symbol
Parameter
LSC
Shorter load det.
VO
Offset detection
INL
Normal load current detection
IOL
Open load current detection
Test condition
Min.
Typ.
Max.
Unit
Power amplifier mode
-
-
0.5
Ω
Line driver mode
-
-
2
Ω
±1.5
±2
±2.5
V
500
-
-
mA
-
-
250
mA
Power amplifier in play, AC Input
signals = 0
VO < (VS - 5)pk
I2C bus interface
fSCL
Clock frequency
-
-
400
-
kHz
VIL
Input low voltage
-
-
-
1.5
V
VIH
Input high voltage
-
2.3
-
-
V
10/30
Doc ID 17984 Rev 2
TDA7562B
Electrical specifications
3.4
Electrical characteristics curves
Figure 4.
Output power vs. supply voltage
(4 Ω)
Figure 5.
0O7
0O7
0OMAX
2,/HM
F+(Z
4($
4($
Output power vs. supply voltage
(2 Ω)
6S6
0OMAX
2,/HM
F+(Z
4($
4($
'!0'03
Distortion vs. output power (4 Ω)
Figure 6.
'!0'03
Distortion vs. output power (2 Ω)
Figure 7.
7+'
6S6
7+'
9V 9
5/ 2KP
9V 9
5/ 2KP
I .+]
I .+]
I .+]
I .+]
3R:
Distortion vs. frequency (4 Ω)
Figure 8.
3R:
7+'
'!0'03
Distortion vs. frequency (2 Ω)
Figure 9.
7+'
9V 9
5/ 2KP
3R :
9V 9
5/ 2KP
3R :
'!0'03
I+]
'!0'03
Doc ID 17984 Rev 2
I+]
'!0'03
11/30
Electrical specifications
TDA7562B
Figure 10. Quiescent current vs. supply
voltage
Figure 11. Crosstalk vs. frequency
&52667$/.G%
,GP$
9LQ 12/2$'6
9V
5/
3R
5J
9
2KP
:
2KP
9V9
I+]
'!0'03
Figure 12. Supply voltage rejection vs.
frequency
'!0'03
Figure 13. Power dissipation and efficiency vs.
output power (4 Ω, SINE)
695G%
3WRW:
Q
Q
9V 9
5/ [2KP
I .+]6,1(
3WRW
5J 2KP
9ULSSOH 9SN
I+]
'!0'03
3R:
'!0'03
Figure 14. Power dissipation vs. average output Figure 15. Power dissipation vs. average output
power (audio program simulation, 4 Ω)
power (audio program simulation, 2 Ω)
3WRW:
3WRW:
9V 9
5/ [2KP
*$866,$112,6(
9V 9
5/ [2KP
*$866,$112,6(
&/,3
67$57
&/,3
67$57
3R:
12/30
'!0'03
Doc ID 17984 Rev 2
3R:
'!0'03
TDA7562B
Diagnostics functional description
4
Diagnostics functional description
4.1
Turn-on diagnostic
It is activated at the turn-on (stand-by out) under I2C bus request. Detectable output faults
are:
–
Short to GND
–
Short to VS
–
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 I2C 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 stand-by 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
9Va9
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Figure 17 and 18 show SVR and output waveforms at the turn-on (standby out) with and
without turn-on diagnostic.
Doc ID 17984 Rev 2
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Diagnostics functional description
TDA7562B
Figure 17. SVR and output behavior (case 1: without turn-on diagnostic)
6SVR
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Figure 18. SVR and output pin behavior (case 2: with turn-on diagnostic)
6SVR
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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
30 dB to 16 dB gain setting. They are as follows:
Figure 19. Thresholds for short to GND/VS
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6
X
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6
636
X
3#TO6S
636
63
'!0'03
Concerning short across the speaker / open speaker, the threshold varies from 30 dB to
16 dB gain setting, since different loads are expected (either normal speaker's impedance
or high impedance). The values in case of 30 dB gain are as follows:
14/30
Doc ID 17984 Rev 2
TDA7562B
Diagnostics functional description
Figure 20. Thresholds for short across the speaker/open speaker
3#ACROSS,OAD
6
X
7
.ORMAL/PERATION
7
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7
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'!0'03
If the Line-Driver mode (Gv= 16 dB and line driver mode diagnostic = 1) is selected, the
same thresholds will change as follows:
Figure 21. Thresholds for line-drivers
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7
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7
7
X
/PEN,OAD
7
INFINITE
'!0'03
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 TDA7562B 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 shutdown. 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 I2C 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
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).
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Diagnostics functional description
TDA7562B
Figure 22. Restart timing without diagnostic enable (permanent)
Each 1 ms time, a sampling of the fault is done
/UT
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'!0'03
Figure 23. Restart timing with diagnostic enable (permanent)
M3
M3
M3
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T
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4.3
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'!0'03
Output DC offset detection
Any DC output offset exceeding ±2V 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.
16/30
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TDA7562B
4.4
Diagnostics functional description
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:
Iout > 500 mApk = normal status
Iout < 250 mApk = 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 500 mApk in normal conditions and lower than 250 mApk 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 > 0 up to the I2C reading of the results
(measuring period). To confirm presence of tweeter, it is necessary to find at least 3 current
pulses over 500 mA 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.
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
,O AD\Z\/HM )OUTPEAKM!
,OWCURRENTDETECTIONAREA
/PENLOAD
$OFTHE$"XBYRES
)OUTPEAKM!
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(IGHCURRENTDETECTIONAREA
.ORMALLOAD
$OFTHE$"XBYTES
6OUT 0EAK
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Diagnostics functional description
4.5
TDA7562B
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 I2C 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. Across L.
Open L.
S. GND (so)(1)
S. GND
S. GND
S. Vs + S.
GND
S. GND
S. GND
S. GND (sk)(1)
/
S. GND
S. Vs
S. GND
Open Load(2)
S. Vs
/
/
S. Vs
S. Vs
S. Vs
S. Across L.
/
/
/
S. Across L.
N.A.
Open L.
/
/
/
/
Open Load (2)
1. 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+.
2. 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).
To guarantee always resident functions, every kind of diagnostic cycles (Turn-on,
Permanent, Offset, AC) will be reactivate after any I2C reading operation. So, when the
micro reads the I2C, 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 I2C. The short to GND is still present in bytes, because it is the
result of the previous cycle. If another I2C reading operation occurs, the bytes do not show
the short). In general to observe a change in Diagnostic bytes, two I2C reading operations
are necessary.
18/30
Doc ID 17984 Rev 2
TDA7562B
4.7
Diagnostics functional description
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 --- I2C read (repeat until All faults
disappear).
AC TEST: FEED H.F. TONE -- AC DIAG ENABLE (write) --- WAIT > 3 CYCLES --- I2C read
(repeat I2C reading until tweeter-off message disappears).
OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I2C reading (repeat
I2C reading until high-offset message disappears).
4.8
Fast muting
The muting time can be shortened to less than 1.5 ms 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. The bit must be set back to “0” shortly after the mute transition.
Doc ID 17984 Rev 2
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I2C bus interface
5
TDA7562B
I2C bus interface
Data transmission from microprocessor to the TDA7562B and voice-overs takes place
through the 2 wires I2C 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 TDA7562B
–
slave (TDA7562B) when the µP reads a data byte from TDA7562B
** Receiver
–
slave (TDA7562B) when the µP writes an address to the TDA7562B
–
master (µP) when it reads a data byte from TDA7562B
Figure 25. Data validity on the I2C bus
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20/30
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Doc ID 17984 Rev 2
'!0'03
I2C bus interface
TDA7562B
Figure 26. Timing diagram on the I2C Bus
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'!0'03
Figure 27. Timing acknowledge clock pulse
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Software specifications
6
TDA7562B
Software specifications
All the functions of the TDA7562B are activated by I2C interface.
The bit 0 of the "ADDRESS BYTE" defines if the next bytes are write instruction (from μP to
TDA7562B) or read instruction (from TDA7562B to µP).
D7
1
D0
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.
IB1
Bit
22/30
Instruction decoding bit
D7
0
D6
Diagnostic enable (D6 = 1)
Diagnostic defeat (D6 = 0)
D5
Offset Detection enable (D5 = 1)
Offset Detection defeat (D5 = 0)
D4
Front Channel
Gain = 30 dB (D4 = 0)
Gain = 16 dB (D4 = 1)
D3
Rear Channel
Gain = 30 dB (D3 = 0)
Gain = 16 dB (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)
Doc ID 17984 Rev 2
0
X
D8 Hex
TDA7562B
Software specifications
Table 7.
IB2
Bit
Instruction decoding bit
D7
0
D6
0
D5
Normal muting time (D5 = 0)
Fast muting time (D5 = 1)
D4
Standby on - Amplifier not working - (D4 = 0)
Standby off - Amplifier working - (D4 = 1)
D3
Power amplifier mode diagnostic (D3 = 0)
Line driver mode diagnostic (D3 = 1)
D2
Current detection diagnostic enabled (D2 = 1)
Current detection diagnostic defeat (D2 = 0)
D1
0
D0
0
If R/W = 1, the TDA7562B 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
Diag. cycle not activated or not terminated (D6 = 0)
Diag. cycle terminated (D6 = 1)
D5
Channel LF
Current detection
Output peak current < 250 mA - Open load (D5 = 1)
Output peak current > 500 mA - Open load (D5 = 0)
D4
Channel LF
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel LF
Normal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1
Channel LF
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
D0
Channel LF
No short to GND (D1 = 0)
Short to GND (D1 = 1)
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Software specifications
Table 9.
TDA7562B
DB2
Bit
24/30
Instruction decoding bit
D7
Offset detection not activated (D7 = 0)
Offset detection activated (D7 = 1)
D6
Current sensor not activated (D6 = 0)
Current sensor activated (D6 = 1)
D5
Channel LR
Current detection
Output peak current < 250 mA - Open load (D5 = 1)
Output peak current > 500 mA - Open load (D5 = 0)
D4
Channel LR
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel LR
Normal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1
Channel LR
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
D0
Channel LR
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Doc ID 17984 Rev 2
TDA7562B
Software specifications
Table 10.
DB3
Bit
Instruction decoding bit
D7
Stand-by status (= IB1 - D4)
D6
Diagnostic status (= IB1 - D6)
D5
Channel RF
Current detection
Output peak current < 250 mA - Open load (D5 = 1)
Output peak current > 500 mA - Open load (D5 = 0)
D4
Channel RF
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel RF
Normal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1
Channel RF
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
D0
Channel RF
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Doc ID 17984 Rev 2
25/30
Software specifications
Table 11.
TDA7562B
DB4
Bit
26/30
Instruction decoding bit
D7
X
D6
X
D5
Channel R
Current detection
Output peak current < 250 mA - Open load (D5 = 1)
Output peak current > 500 mA - Open load (D5 = 0)
D4
Channel RR
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel RR
Normal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1
Channel RR
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
D0
Channel RR
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Doc ID 17984 Rev 2
TDA7562B
7
Examples of bytes sequence
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 30 dB gain, mute on, diagnostic defeat.
Start
Address byte with D0 = 0
ACK
IB1
ACK
X000000X
IB2
ACK
STOP
ACK
STOP
ACK
STOP
XXX1X0XX
3b - Turn-off of the power amplifier
Start
Address byte with D0 = 0
ACK
IB1
ACK
X0XXXXXX
IB2
XXX0XXXX
4 - Offset detection procedure enable
Start
Address byte with D0 = 0
ACK
IB1
ACK
XX1XX11X
IB2
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 (2 V 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
XX01111X
IB2
ACK
STOP
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.
Doc ID 17984 Rev 2
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Package information
8
TDA7562B
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. Flexiwatt27 mechanical data and package dimensions
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28/30
Doc ID 17984 Rev 2
TDA7562B
9
Revision history
Revision history
Table 12.
Document revision history
Date
Revision
Changes
20-Sep-2010
1
Initial release.
01-Feb-2011
2
Updated Section 4.1: Turn-on diagnostic.
Updated Section 7: Examples of bytes sequence.
Doc ID 17984 Rev 2
29/30
TDA7562B
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