STMicroelectronics TDA7561 Datasheet

TDA7561

Multifunction quad power amplifier with built-in diagnostics features

Datasheet



production data

Features

■

■

■

■

■

■

■

■

■

■

Multipower BCD technology

DMOS power output

High output power capability 4 x 25 W / 4



@

14.4 V, 1 kHz, 10 % THD, 4 x 35 W EIAJ

Max. output power 4 x 60 W / 2



Full I

2

C bus driving:

– Standby

– Independent front/rear soft play/mute

– Selectable gain 26 dB - 12 dB (for low noise line output function)

– I

2

C bus digital diagnostics

Full fault protection

DC offset detection

Four independent short circuit protection

Clipping detector

ESD protection

'!0'03

Flexiwatt25

(vertical)

Flexiwatt25

(horizontal)

'!0'03

Thanks to the DMOS output stage the TDA7561 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 behaviour of the device by means of the I

2

C bus makes TDA7561 a very flexible machine.

Description

The TDA7561 is a BCD technology quad bridge type of car radio amplifier in Flexiwatt25 package specially intended for car radio applications.

Table 1.

Device summary

Order code

TDA7561

TDA7561H

Package

Flexiwatt25 (vertical)

Flexiwatt25 (horizontal)

Packing

Tube

Tube

September 2013

This is information on a product in full production.

Doc ID 8326 Rev 6 1/27 www.st.com

1

7

8

9

10

1

2

3

Contents

Contents

4

5

6

TDA7561

Block diagram and test/application diagram . . . . . . . . . . . . . . . . . . . . . 5

Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

Diagnostics functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1

Turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2

Permanent diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.3

Output DC offset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.1

Faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

I2C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.1

I2C programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.2

I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.2.1

6.2.2

6.2.3

6.2.4

Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2/27 Doc ID 8326 Rev 6

TDA7561

List of tables

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Double fault table for turn-on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

IB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

IB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 9.

DB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 10.

DB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 11.

DB4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 12.

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Doc ID 8326 Rev 6 3/27

List of figures

List of figures

TDA7561

Figure 1.

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2.

Test and application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3.

Pins connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4.

Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 5.

Output power vs. supply voltage, R

L

= 2

 

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Output power vs. supply voltage, R

Distortion vs output power, R

Distortion vs output power, R

Distortion vs. frequency, R

Distortion vs. frequency, R

L

L

L

L

L

= 4

 

= 2



= 4



= 2

 

= 4

 

Figure 11.

Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 12.

Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 13.

Power dissipation and efficiency vs. output power (4



, SINE). . . . . . . . . . . . . . . . . . . . . . 11

Figure 14.

Power dissipation vs. average output power (audio program simulation, 4



) . . . . . . . . . . 11

Figure 15.

Power dissipation vs. average output power (audio program simulation, 2



Figure 16.

Turn-on diagnostic: working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 17.

SVR and output behaviour (case 1: without turn-on diagnostic). . . . . . . . . . . . . . . . . . . . . 12

Figure 18.

SVR and output pin behaviour (case 2: with turn-on diagnostic) . . . . . . . . . . . . . . . . . . . . 13

Figure 19.

Short circuit detection thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 20.

Load detection thresholds - high gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 21.

Load detection threshold - low gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 22.

Restart timing without diagnostic enable (permanent) - Each 1 mS time,

a sampling of the fault is done . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 23.

Restart timing with diagnostic enable (permanent). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 24.

Data validity on the I

2

C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 25.

Timing diagram on the I

2

C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 26.

Acknowledge on the I

2

C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 27.

Flexivatt25 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 24

Figure 28.

Flexivatt25 (horizontal) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . 25

4/27 Doc ID 8326 Rev 6

TDA7561

1

Block diagram and test/application diagram

Block diagram and test/application diagram

Figure 1.

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Test and application diagram

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Doc ID 8326 Rev 6 5/27

Pins description

6/27

Figure 3.

Pins connection diagram (top view)

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Doc ID 8326 Rev 6

TDA7561

'!0'03

TDA7561 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 ms)

Output peak current (repetitive f > 10 Hz)

Power dissipation T case

= 70 °C

Storage and junction temperature

Value

8

6

6

6

18

28

50

85

-55 to 150

Unit

A

A

V

V

V

V

V

W

°C

Table 3.

Symbol

Thermal data

Parameter

R th j-case

Thermal resistance junction-to-case Max.

Value

1

Unit

°C/W

Table 4.

Symbol

Refer to the test circuit, V

S

= 14.4 V; R

L

= 4



; f = 1 kHz; T amb

= 25 °C; unless otherwise specified.

Electrical characteristics

Parameter Test condition Min. Typ.

Max.

Unit

Power amplifier

V

S

I d

Supply voltage range

Total quiescent drain current

P

O

Output power

-

-

EIAJ (V

S

= 13.7 V)

THD = 10%

THD = 1%

R

L

= 2



; EIAJ (V

S

= 13.7 V)

R

L

= 2



; THD 10%

R

L

= 2



; THD 1%

R

L

= 2



; Max. power

22

-

50

8

-

32

32

-

-

-

150

35

25

20

55

38

30

60

-

-

-

18

300

-

-

-

-

W

W

W

V mA

W

W

W

W

Doc ID 8326 Rev 6 7/27

Electrical specifications TDA7561

Table 4.

Symbol

Electrical characteristics (continued)

Parameter Test condition

THD

C

T

R

IN

G

V1



G

V1

G

V2



G

V2

E

IN1

E

IN2

Total harmonic distortion

Cross talk

Input impedance

Voltage gain 1

Voltage gain match 1

Voltage gain 2

Voltage gain match 2

Output noise voltage 1

Output noise voltage 2

-

-

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



-

-

-

Rg = 600



, 20 Hz to 22 kHz

Rg = 600



; G

V

= 12 dB

20 Hz to 22 kHz

SVR

BW

A

SB

I

SB

A

M

V

OS

V

AM

T

ON

T

OFF

CD

LK

CD

CD

SAT

THD

Supply voltage rejection

Power bandwidth

Standby attenuation

Standby current

Mute attenuation

Offset voltage

Min. supply mute threshold

Turn-on delay

Turn-off delay

Clip det. high leakage current

Clip det. sat. voltage

Clip det. THD level

-

-

-

f = 100 Hz to 10 kHz;

Vr = 1 Vpk; R g

= 600



Mute & play

-

D2/D1 (IB1) 0 to 1

D2/D1 (IB1) 1 to 0

CD off

CD on; I

CD

= 1 mA

V

S

> 10 V

Turn on diagnostics 1 (Power amplifier mode)

Pgnd

Pvs

Pnop

Lsc

Short to GND det. (below this limit, the Output is considered in short circuit to GND)

Power amplifier in standby condition

Short to Vs det. (above this limit, the output is considered in short circuit to V

S

)

-

Normal operation thresholds.

(Within these limits, the Output is considered without faults).

-

Shorted load det.

Lop Open load det.

-

-

Lnop Normal load det.

-

-

50

-

Vs -1.2

1.8

-

130

1.5

20

20

0

150

1

-

110

25

100

0

7.5

-

-

-

-

-

100

90

-

80

-100

7

Min. Typ.

Max.

80

25

-1

11

-

-

50

-1

-

0.04

0.02

60

100

26

-

12

-

35

0.1

0.05

-

130

27

1

13

1

80

12

60

-

-

-

-

-

-

20

-

1.2

Vs -1.8

0.5

70

40

40

15

300

2

-

-

100

-

100

8

Unit

%

% dB k

 dB dB dB dB

µV

µV dB

V

V

V





 ms ms

µA mV

% kHz dB

µA dB mV

V

8/27 Doc ID 8326 Rev 6

TDA7561 Electrical specifications

Table 4.

Symbol

Electrical characteristics (continued)

Parameter Test condition Min. Typ.

Max.

Turn-on diagnostics 2 (Line driver mode)

Pgnd

Pvs

Pnop

Lsc

Short to GND det. (below this limit, the Output is considered in short circuit to GND)

Power amplifier in standby

Short to Vs det. (above this limit, the output is considered in short circuit to V

S

)

-

Normal operation thresholds

(within these limits, the output is considered without faults).

-

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

-

-

400

4.5

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 V

S

)

-

Normal operation thresholds.

(within these limits, the output is considered without faults)

-

Shorted 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

2

C bus interface f

SCL

V

IL

V

IH

Clock frequency

Input low voltage

Input high voltage -

-

-

-

-

2.3

-

-

-

-

-

-

-

-

-

-

-

2

400

-

-

1.2

1.5

-

200

0.5

1.5

-

1.5

-

-

Vs -1.8

1.2

-

Vs -1.8

2.5

Unit

V

V

V

V

V

V





V





 kHz

V

V

Doc ID 8326 Rev 6 9/27

Electrical specifications TDA7561

Figure 4.

Quiescent current vs. supply voltage

)DM!

6IN

./ , /!$3

Figure 5.

Output power vs. supply voltage,

R

L

= 2



0O 7

0O MAX

2, /HM

F+( Z

4($

4($

6S6

'!0'03

Figure 6.

Output power vs. supply voltage,

R

L

= 4



0O 7

6S6

Figure 7.

Distortion vs output power,

R

L

= 2



4( $

'!0'03

2, /HM

F+( Z

0O MAX

4( $

6 S 6

2,/ HM

FK (Z

FK (Z

4( $

6S6

Figure 8.

Distortion vs output power,

R

L

= 4



4($

'!0'03

0O 7

'!0'03

Figure 9.

Distortion vs. frequency, R

L

= 2



4( $

6 S6

2,/ HM

6S 6

2, /HM

0O 7

FK(Z

FK (Z

0O 7 F(Z

'!0'03

10/27

'!0'03

Doc ID 8326 Rev 6

TDA7561 Electrical specifications

Figure 10.

Distortion vs. frequency, R

L

= 4



Figure 11.

Crosstalk vs. frequency

4($

6S 6

2,/HM

0O 7

#2/33 4!,+D"

6S6

2,/HM

0O 7

2G/HM

F(Z

Figure 12.

Supply voltage rejection vs. frequency

362 D"

'!0'03

F(Z

'!0'03

Figure 13.

Power dissipation and efficiency vs. output power (4



, SINE)

0TOT7 H

H

6S6

2,X/HM

F+(Z3).%

0TOT

2G/HM

6R IPPLE 6 PK

F(Z 0O7

'!0'03 '!0'03

Figure 14.

Power dissipation vs. average output power (audio program simulation, 4



)

Figure 15.

Power dissipation vs. average output power (audio program simulation, 2



0TOT7 0TOT7

6S6

2,X/HM

'!533)!../)3%

#,)0

34!24

6S6

2,X /HM

'!533)!../)3% #,)0

34!24

0O 7

'!0'03

Doc ID 8326 Rev 6

0O7

'!0'03

11/27

Diagnostics functional description

4 Diagnostics functional description

TDA7561

●

●

●

●

It is activated at the turn-on (standby out) under I

2

C 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 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 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 ,P$

,VRXUFH

,VRXUFH

,VLQN

,VLQN aPV

0HDVXUHWLPH

WPV

'!0'03

Figure 17

and

18

show SVR and output waveforms at the turn-on (stand-by out) with and without turn-on diagnostic.

Figure 17.

SVR and output behaviour (case 1: without turn-on diagnostic)

6SVR

/UT

0ERMANENTDIAGNOSTIC

ACQUISITIONTIMEM34YP

12/27

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)#"$!4!

$IAGNOSTIC%NABLE

0ERMANENT &!5,4

EVENT

0ERMANENT$IAGNOSTICSDATAOUTPUT

PERMITTEDTIME

2EAD$ATA

Doc ID 8326 Rev 6

T

'!0'03

TDA7561 Diagnostics functional description

Figure 18.

SVR and output pin behaviour (case 2: with turn-on diagnostic)

6 S VR

/ U T

4URNONDIAGNOSTIC

ACQUISITIONTIMEM34YP

0ERMANENTDIAGNOSTIC

ACQUISITIONTIMEM34YP

T

$IAGNOSTIC%NABLE

4URNON

4URNON$IAGNOSTICSDATAOUTPUT

PERMITTEDTIME

$IAGNOSTIC%NABLE

0ERMANENT

&!5,4

EVENT

) # " $ !4!

"IASPOWERAMPTURNON

PERMITTEDTIME

2EAD$ATA 0ERMANENT$IAGNOSTICDATAOUTPUT

PERMITTEDTIME

'!0'03

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.

Short circuit detection thresholds

3#TO'.$ X .ORMAL/PERATION X 3#TO6S

6 6 6 6

3

6 6

3

6 6

3

'!0'03

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.

Load detection thresholds - high gain setting

3#ACROSS,OAD X .ORMAL/PERATION X /PEN,OAD

6 7 7 7 7 )NFINITE

'!0'03

If the line-driver mode (Gv = 12 dB and line driver mode diagnostic = 1) is selected, the same thresholds will change as follows:

Figure 21.

Load detection threshold - low gain setting

3#ACROSS,OAD X .ORMAL/PERATION X /PEN,OAD

7 7 7 7 7 INFINITE

'!0'03

Doc ID 8326 Rev 6 13/27

Diagnostics functional description TDA7561

14/27

Detectable conventional faults are:

●

●

●

Short to GND

Short to Vs

Short across the speaker

The following additional features are provided:

● Output offset detection

The TDA7561 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 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

/UT

M3

M3 M3 M3

M3

/VERCURRENT AND SHOR T

CIRCUIT PROTECTIONINTERVENTION

IESHORT CIRCUI TT O'.$

T

3HORT CIRCUI TREMOVED

Figure 23.

Restart timing with diagnostic enable (permanent)

M3 M3 M3 M3

/VERCURRENT ANDSHORT

CIRCUITPROTECTI ON IN TERVENTI ON

IES HORTC IRCUI TTO'.$

'!0'03

T

3HO RTCIRCUIT REMOVED

'!0'03

Doc ID 8326 Rev 6

TDA7561

4.3

Diagnostics functional description

Output DC offset detection

Any DC output offset exceeding ±2 V are signalled out. This inconvenient might occur as a consequence of initially defective or aged and worn-out input capacitors feeding a DC component to the inputs, so putting the speakers at risk of overheating.

This diagnostic has to be performed with low-level output AC signal (or Vin = 0).

●

●

The test is run with selectable time duration by microprocessor (from a "start" to a "stop" command):

Start = Last reading operation or setting IB1 - D5 - (offset enable) to 1

Stop = Actual reading operation

Excess offset is signalled out if persistent throughout the assigned testing time. This feature is disabled if any overloads leading to activation of the short-circuit protection occurs in the process.

Doc ID 8326 Rev 6 15/27

Multiple faults TDA7561

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 possible double-fault. It should be taken into account that a short circuit with the 4 ohm speaker unconnected is considered as double fault.

Table 5.

S. GND (so)

S. GND (sk)

S. Vs

S. Across L.

Open L.

Double fault table for turn-on diagnostic

S. GND (so) S. GND (sk) S. Vs

S. GND

/

/

/

/

S. GND

S. GND

/

/

/

S. Vs + S.

GND

S. Vs

S. Vs

/

/

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, 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.

To guarantee always resident functions, every kind of diagnostic cycles (Turn-on,

Permanent, Offset) will be reactivate after any I

2

C reading operation. So, when the microprocessor 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.

16/27 Doc ID 8326 Rev 6

TDA7561

6 I

2

C bus

I2C bus

6.1 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).

Offset test: Device in Play (no signal) -- Offset enable - 30 ms - I

2

C reading (repeat I

2

C reading until high-offset message disappears).

6.2 I

2

C bus interface

Data transmission from microprocessor to the TDA7561 and viceversa 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).

6.2.2

As shown by

Figure 24 , 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

Figure 25

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.

Doc ID 8326 Rev 6 17/27

I2C bus TDA7561

6.2.4 Acknowledge

The transmitter puts a resistive HIGH level on the SDA line during the acknowledge clock

pulse (see Figure 26 ). The receive 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 TDA7561

– slave (TDA7561) when the µP reads a data byte from TDA7561

Receiver:

– slave (TDA7561) when the µP writes an address to the TDA7561

– master (µP) when it reads a data byte from TDA7561

Figure 24.

Data validity on the I

2

C bus

3$!

3#,

$!4!,).%

34!",%$!4!

6!,)$

#(!.'%

$!4!

!,,/7%$

Figure 25.

Timing diagram on the I

2

C bus

3#,

'!0'03

) #"53

3$!

34!24

Figure 26.

Acknowledge on the I

2

C bus

3#,

34/0

'!0'03

3$!

-3"

34!24

!#+./7,%$'-%.4

&2/-2%#%)6%2

'!0'03

18/27 Doc ID 8326 Rev 6

TDA7561 Software specifications

All the functions of the TDA7561 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

TDA7561) or read instruction (from TDA7561 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

X

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)

X

Instruction decoding bit

0

Doc ID 8326 Rev 6 19/27

Software specifications TDA7561

Table 7.

Bit

D7

D6

D5

D4

D3

D2

D1

D0

IB2

Instruction decoding bit

X

X

X

X

Used for testing

Used for testing

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)

If R/W = 1, the TDA7561 sends 4 "Diagnostics Bytes" to µP: 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)

X

Channel LFTurn-on diagnostic (D4 = 0)

Permanent diagnostic (D4 = 1)

Channel LF

Normal load (D3 = 0)

Short load (D3 = 1)

Channel LFTurn-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 LFNo short to Vcc (D1 = 0)Short to Vcc (D1 = 1)

Channel LFNo short to GND (D1 = 0)Short to GND (D1 = 1)

20/27 Doc ID 8326 Rev 6

TDA7561

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)

X

X

Channel LRTurn-on diagnostic (D4 = 0)

Permanent diagnostic (D4 = 1)

Channel LRNormal load (D3 = 0)

Short load (D3 = 1)

Channel LRTurn-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)

Table 10.

DB3

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Instruction decoding bit

Standby status (= IB1 - D4)

Diagnostic status (= IB1 - D6)

X

Channel RFTurn-on diagnostic (D4 = 0)

Permanent diagnostic (D4 = 1)

Channel RFNormal 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 RFNo short to Vcc (D1 = 0)

Short to Vcc (D1 = 1)

Channel RFNo short to GND (D1 = 0)

Short to GND (D1 = 1)

Software specifications

Doc ID 8326 Rev 6 21/27

Software specifications

Table 11.

DB4

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Instruction decoding bit

X

X

X

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 RRNo short to Vcc (D1 = 0) Short to Vcc (D1 = 1)

Channel RRNo short to GND (D1 = 0) Short to GND (D1 = 1)

TDA7561

22/27 Doc ID 8326 Rev 6

TDA7561

8 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 1 ms

3a - Turn-on of the power amplifier with 26 dB gain, mute on, diagnostic defeat.

Start Address byte with D0 = 0 ACK IB1

X000000X

ACK IB2

XXX1X0XX

ACK STOP

3b - Turn-off of the power amplifier

Start Address byte with D0 = 0 ACK IB1

X0XXXXXX

ACK IB2

XXX0XXXX

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 DC 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 1 ms.

Doc ID 8326 Rev 6 23/27

Package information TDA7561

24/27

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 27. Flexivatt25 (vertical) mechanical data and package dimensions

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Doc ID 8326 Rev 6

TDA7561 Package information

Figure 28. Flexivatt25 (horizontal) mechanical data and package dimensions

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Doc ID 8326 Rev 6 25/27

Revision history TDA7561

Table 12.

Document revision history

Date Revision

December 2002

17-May-2012

16-Sep-2103

4

5

6

Changes

-

Document reformatted.

Added

Table 1: Device summary on page 1

.

Added

Figure 28: Flexivatt25 (horizontal) mechanical data and package dimensions on page 25 .

Updated Disclaimer.

26/27 Doc ID 8326 Rev 6

TDA7561

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice.

All ST products are sold pursuant to ST’s terms and conditions of sale.

Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.

UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED

WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED

WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS

OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.

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