STMicroelectronics TDA7562B Datasheet

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



@

14.4 V, 1 kHz, 10 % THD

Max. output power 4 x 68 W/2



, 4 x 42 W/4



@ 14.4 V

Full I

2

C bus driving:

– Standby

– Independent front/rear soft play/mute

– Selectable gain 30 dB - 16 dB

– I

2

C bus digital diagnostics

Full fault protection

DC offset detection

Four independent short circuit protection

Clipping detector (2 % / 10 %)

Standby/mute pin

ESD protection

Flexiwatt27

'!0'03

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.

Device summary

Order code

TDA7562B

Package

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 I

2

C bus.

The possibility to control the configuration and behavior of the device by means of the I

2

C bus makes TDA7562B a very flexible machine.

Packing

Tube

September 2013 Doc ID 17984 Rev 3 1/30 www.st.com

1

2

3

6

7

8

9

2/30

Contents

Contents

1

4

5

TDA7562B

Block diagram and application and test circuit . . . . . . . . . . . . . . . . . . . 5

1.1

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

1.2

Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

I

2

C Programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.8

Fast muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

I

2

C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.1

Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.2

Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3

Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.4

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Examples of bytes sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Doc ID 17984 Rev 3

TDA7562B

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Double fault table for turn on diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

IB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

IB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 9.

DB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 10.

DB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 11.

DB4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 12.

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Doc ID 17984 Rev 3 3/30

List of figures

List of figures

TDA7562B

Figure 1.

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

Figure 2.

Application and test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3.

Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4.

Output power vs. supply voltage (4



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

Figure 5.

Output power vs. supply voltage (2



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

Figure 6.

Distortion vs. output power (4



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

Figure 7.

Distortion vs. output power (2



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

Figure 8.

Distortion vs. frequency (4



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

Figure 9.

Distortion vs. frequency (2



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

Figure 10.

Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 11.

Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 12.

Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 13.

Power dissipation and efficiency vs. output power (4 W, SINE) . . . . . . . . . . . . . . . . . . . . . 12

Figure 14.

Power dissipation vs. average output power (audio program simulation, 4 W) . . . . . . . . . 12

Figure 15.

Power dissipation vs. average output power (audio program simulation, 2 W) . . . . . . . . . 12

Figure 16.

Turn-on diagnostic: working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 17.

SVR and output behavior (case 1: without turn-on diagnostic). . . . . . . . . . . . . . . . . . . . . . 14

Figure 18.

SVR and output pin behavior (case 2: with turn-on diagnostic) . . . . . . . . . . . . . . . . . . . . . 14

Figure 19.

Thresholds for short to GND/V

S

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 20.

Thresholds for short across the speaker/open speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 21.

Thresholds for line-drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 22.

Restart timing without diagnostic enable (permanent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 23.

Restart timing with diagnostic enable (permanent). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 24.

Current detection: Load impedance magnitude |Z| Vs. output peak voltage of the sinus . . 17

Figure 25.

Data validity on the I

2

C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 26.

Timing diagram on the I

2

C Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 27.

Timing acknowledge clock pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 28.

Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4/30 Doc ID 17984 Rev 3

TDA7562B

1

Block diagram and application and test circuit

Block diagram and application and test circuit

1.2

Figure 1.

Block diagram

34"9-54%

#,+ $!4!

2%&%2%.#%

4(%2-!,

02/4%#4)/.

$5-0

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-54% -54%

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2

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362 !#?'.$

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3(/24#)2#5)4

02/4%#4)/.

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3(/24#)2#5)4

02/4%#4)/.

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07?'.$

4!" 3?'.$

'!0'03

Application and test circuit

Figure 2.

Application and test circuit

#

M &

666

##

)#"53

#,+

# M &

).2&

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# M &

).22

# M &

).,&

# M &

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M &

6CC 6CC

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#

M &

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+

4!"

6

/542&

/5422

/54,&

/54,2

'!0'03

Doc ID 17984 Rev 3 5/30

Pin description

Figure 3.

Pin connection (top view)

TDA7562B

4!"

$!4!

07?'.$22

/5422

#+

/5422

6

##

/542&

07?'.$2&

/542&

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6/30 Doc ID 17984 Rev 3

TDA7562B 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

T op

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

 s)

Output peak current (repetitive f > 10 Hz)

Power dissipation T case

= 70 °C

Storage and junction temperature

Operative temperature range

Table 3.

Symbol

Thermal data

Description

R th j-case

Thermal resistance junction-to-case

Value

8

6

6

6

85

18

28

50

-55 to 150

-40 to 105

Unit

A

A

V

V

W

V

V

V

°C

°C

Max.

Value

1

Unit

°C/W

Doc ID 17984 Rev 3 7/30

Electrical specifications TDA7562B

Table 4.

Symbol

Electrical characteristics

Parameter

Power amplifier

V

S

I d

Supply voltage range

Total quiescent drain current

P

O

Refer to the test circuit, V

S

= 14.4 V; R

L

= 4



; f = 1 kHz; G

V

= 30 dB; T amb

= 25 °C; unless otherwise specified.

Output power

THD Total harmonic distortion

C

T

R

IN

G

V1



G

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

V

SBY

V

MU

V

OP

A

SB

I

SB

A

M

V

OS

V

AM

T

ON

T

OFF

Power bandwidth

Standby/mute pin for standby

Standby/mute pin for mute

Standby/mute pin for operating

Standby attenuation

Standby current

Mute attenuation

Offset voltage

Min. supply voltage threshold

Turn on delay

Turn off delay

Test condition Min.

-

-

-

-

Max. (V

S

= 15.2 V)

THD = 10 %

THD = 1 %

Max power

R

L

R

L

R

L

= 2



; THD 10%

= 2



; THD 1%

= 2



; max. power

P

O

= 1 W to 10 W;

G

V

= 16 dB;

V

O

= 0.1 to 5 V

RMS f = 1 kHz to 10 kHz, R

G

= 600



-

-

-

-

-

-

R g

= 600



20 Hz to 22 kHz

R g

= 600



;

G

V

= 16 dB; 20 Hz to 22 kHz

f = 100 Hz to 10 kHz; V r

= 1 Vpk;

R g

= 600



-

V

SBY

= 0V

Mute and play

-

D2/D1 (IB1) 0 to 1

D2/D1 (IB1) 1 to 0

-

-

50

100

0

3.5

7

90

-

80

-100

6.5

8

8

8

--

-

24

18

37

38

30

60

-

-1

15

-

50

60

29

Typ.

Max.

-

150

46

27

22

42

45

36

70

0.04

0.02

0

16

60

60

100

30

20

60

18

300

-

-

-

0.1

0.05

30

-

10

-

100

8

50

50

-

1.5

5

V

S

-

-

110

1

100

0

-

-

-

7.5

20

20

-

130

31

1

17

100

Unit

V mA

W

W

W

%

% dB dB



V dB k

 dB



V dB kHz

V

V

V dB



A dB mV

V ms ms

8/30 Doc ID 17984 Rev 3

TDA7562B Electrical specifications

Table 4.

Symbol

CD

LK

CD

SAT

CD

THD

Electrical characteristics (continued)

Parameter

Clip det high leakage current

Clip det sat. voltage

Clip det THD level

Test condition

CD off

CD on; I

CD

= 1 mA

D0 (IB1) = 0

D0 (IB1) = 1

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).

Power amplifier in standby

Lsc Shorted load det.

Lop Open load det.

Lnop Normal load det.

-

-

-

Turn on diagnostics 2 (line driver mode)

Pgnd

Pvs

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

Pnop

Normal operation thresholds.

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

Shorted load det.

Lsc

Lop Open load det.

Lnop Normal load det.

-

-

-

Permanent diagnostics 2 (power amplifier mode or 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 circuit to VS)

-

Power amplifier in mute or play, one or more short circuits protection activated

Normal operation thresholds.

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

-

Min.

-

-

0.5

5

-

Vs -1.2

1.8

-

85

1.5

Vs -1.2

1.8

-

330

7

-

-

Vs -1.2

1.8

-

-

-

-

-

-

Typ.

Max.

0

-

2

10

5

300

3

15

-

-

-

-

-

-

-

-

1.2

Vs -1.8

0.5

-

45

1.2

Vs -1.8

2

-

180

1.2

-

-

-

Vs -1.8

Unit



A mV

%

%

V

V

V

V

V

V

V

V

V













Doc ID 17984 Rev 3 9/30

Electrical specifications TDA7562B

Table 4.

Symbol

L

SC

V

O

Electrical characteristics (continued)

Parameter Test condition

Shorter load det.

Offset detection

Power amplifier mode

Line driver mode

Power amplifier in play, AC Input signals = 0

I

NL

I

OL

Normal load current detection

Open load current detection

I

2

C bus interface f

SCL

V

IL

V

IH

Clock frequency

Input low voltage

Input high voltage

V

O

< (V

S

- 5)pk

-

-

-

Min.

-

-

±1.5

500

-

-

-

2.3

Typ.

Max.

-

0.5

2

±2

-

-

±2.5

-

250

Unit





V mA mA

400

-

-

-

1.5

kHz

V

V

10/30 Doc ID 17984 Rev 3

TDA7562B Electrical specifications

Figure 4.

Output power vs. supply voltage

(4



)

0O7

0OMAX

2,/HM

F+(Z

4($

Figure 5.

Output power vs. supply voltage

(2



)

0O7

2,/HM

F+(Z

0OMAX

4($

4($ 4($

6S6

'!0'03

Figure 6.

Distortion vs. output power (4



)

6S6

'!0'03

Figure 7.

Distortion vs. output power (2



)

7+' 7+'

9V 9

5/ 2KP

9V 9

5/ 2KP

I .+]

I .+]

I .+]

I .+]

3R:

Figure 8.

Distortion vs. frequency (4



)

'!0'03

3R:

'!0'03

Figure 9.

Distortion vs. frequency (2



)

7+'

9V 9

5/ 2KP

3R :

7+'

9V 9

5/ 2KP

3R :

I+]

'!0'03

Doc ID 17984 Rev 3

I+]

'!0'03

11/30

Electrical specifications

Figure 10. Quiescent current vs. supply voltage

,GP$

9LQ

12/2$'6

Figure 11. Crosstalk vs. frequency

&52667$/.G%

TDA7562B

9V 9

5/ 2KP

3R :

5J 2KP

9V9

Figure 12. Supply voltage rejection vs. frequency

'!0'03

I+]

'!0'03

Figure 13.

Power dissipation and efficiency vs. output power (4



, 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 power (audio program simulation, 4



)

Figure 15.

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



)

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3R:

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Doc ID 17984 Rev 3

3R:

'!0'03

TDA7562B

4

Diagnostics functional description

Diagnostics functional description

It is activated at the turn-on (stand-by 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 (

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

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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 3 13/30

Diagnostics functional description

Figure 17.

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

6SVR

/UT

0ERMANENTDIAGNOSTIC

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Figure 18.

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

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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/V

S

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 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:

Doc ID 17984 Rev 3

TDA7562B Diagnostics functional description

Figure 20.

Thresholds for short across the speaker/open speaker

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

6 7 7 7 7 )NFINITE

'!0'03

If the Line-Driver mode (G v

= 16 dB and line driver mode diagnostic = 1) is selected, the same thresholds will change as follows:

Figure 21.

Thresholds for line-drivers

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

7 7 7 7 7 INFINITE

'!0'03

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 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).

Doc ID 17984 Rev 3 15/30

16/30

Diagnostics functional description

Figure 22.

Restart timing without diagnostic enable (permanent)

Each 1 ms time, a sampling of the fault is done

M3

M3 M3 M3

M3

TDA7562B

/UT

4.3

/VERCUR RENTAND SHOR T

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IESHOR TCIRCUI TT O'.$

T

3HOR TCIRCUI TREMOVED

Figure 23.

Restart timing with diagnostic enable (permanent)

M3 M3 M3 M3

/VERCURRENT ANDSHORT

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IES HORTC IRCUI TTO'.$

'!0'03

T

3HO RTCIRCUIT REMOVED

'!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 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 17984 Rev 3

TDA7562B Diagnostics functional description

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

> 500 mApk = normal status

I out

< 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 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 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

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Doc ID 17984 Rev 3 17/30

Diagnostics functional description TDA7562B

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)

(1)

S. GND (sk)

(1)

S. GND

/

S. GND

S. GND

S. Vs + S.

GND

S. Vs

S. Vs / / S. Vs

S. Across L.

S. GND

S. GND

S. Vs

Open L.

S. GND

Open Load

S. Vs

(2)

S. Across L.

/ / / S. Across L.

N.A.

Open Load

(2)

Open L.

/ / / /

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).

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.

18/30 Doc ID 17984 Rev 3

TDA7562B Diagnostics functional description

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).

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 3 19/30

I

2

C bus interface

5 I

2

C bus interface

TDA7562B

Data transmission from microprocessor to the TDA7562B and voice-overs 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

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.

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.

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 I

2

C bus

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3#,

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34!",%$!4!

6!,)$

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20/30 Doc ID 17984 Rev 3

TDA7562B

Figure 26.

Timing diagram on the I

2

C Bus

3#,

3$!

34!24

Figure 27.

Timing acknowledge clock pulse

3#,

3$!

-3"

34!24

I

2

C bus interface

34/0

) #"53

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Doc ID 17984 Rev 3 21/30

22/30

Software specifications TDA7562B

All the functions of the TDA7562B are activated by I

2

C interface.

The bit 0 of the "ADDRESS BYTE" defines if the next bytes are write instruction (from



P to

TDA7562B) or read instruction (from TDA7562B to µP).

D7

1 1 0 1 1 0 0

D0

X D8 Hex

X = 0 write to device

X = 1 read from device

If R/W = 0, the



P 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 = 30 dB (D4 = 0)

Gain = 16 dB (D4 = 1)

Rear Channel

Gain = 30 dB (D3 = 0)

Gain = 16 dB (D3 = 1)

Mute front channels (D2 = 0)

Unmute front channels (D2 = 1)

Mute rear channels (D1 = 0)

Unmute rear channels (D1 = 1)

CD 2% (D0 = 0)

CD 10% (D0 = 1)

Doc ID 17984 Rev 3

TDA7562B Software specifications

Table 7.

Bit

D7

D6

D5

D4

D3

D2

D1

D0

IB2

Instruction decoding bit

0

0

Normal muting time (D5 = 0)

Fast muting time (D5 = 1)

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 TDA7562B 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 < 250 mA - Open load (D5 = 1)

Output peak current > 500 mA - 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)

Doc ID 17984 Rev 3 23/30

Software specifications

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 < 250 mA - Open load (D5 = 1)

Output peak current > 500 mA - 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)

TDA7562B

24/30 Doc ID 17984 Rev 3

TDA7562B

Table 10.

DB3

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Instruction decoding bit

Stand-by status (= IB1 - D4)

Diagnostic status (= IB1 - D6)

Channel RF

Current detection

Output peak current < 250 mA - Open load (D5 = 1)

Output peak current > 500 mA - 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)

Software specifications

Doc ID 17984 Rev 3 25/30

Software specifications

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)

TDA7562B

26/30 Doc ID 17984 Rev 3

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

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 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 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.

Doc ID 17984 Rev 3 27/30

Package information TDA7562B

28/30

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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Doc ID 17984 Rev 3

TDA7562B

Table 12.

Document revision history

Date Revision

20-Sep-2010

01-Feb-2011

18-Sep-2013

1

2

3

Changes

Initial release.

Updated

Section 4.1: Turn-on diagnostic .

Updated

Section 7: Examples of bytes sequence

.

Updated Disclaimer.

Revision history

Doc ID 17984 Rev 3 29/30

TDA7562B

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