DOWNLOAD Panasonic KX-TDA6178X / KX-TDA6178XJ (serv.man3) Service Manual ↓ Size: 1.87 MB | Pages: 43 in PDF or view online for FREE

10

KX-TDA6178X / KX-TDA6178XJ

4 out of 24 lines have switching relays (RL200A-D) installed in order to enable the outside call during a power failure. The line con-
nected to the outside call card will be directly connected to the CN201 located in forward part of the board via a 4-conductor TEL
cord. In the normal operation mode, it breaks the power failure switching relay, and during a power failure, it makes the power fail-
ure switching relay to initiate Power failure direct connection mode.

In  ringing mode, the ringing DC offset and the ringing signal are summed within SLIC/CODEC(IC300A-W) in accordance with the
programmed values.
The SLIC/CODEC(IC300A-W) supplies the line with 65 Vrms.
The bell signal is generated with VBAT supplied to the SLIC/CODEC(IC300A-W).

TA

RA

CN201

2

DIAG_T

RL201A

6

7

5

CN201

3

DIAG_R

RL201A

3

2

4

C302A

C303A

J300A

DG

DG

R308A

R309A

D305A

C304A

DG

D304A

FG

C305A

C321A

CN200

26

1

IC300A

TIPa

1

SRINGDCa

5

SRINGACa

6

STIPACa

7

STIPDCa

8

SDCHa

20

SDCLa

21

DCDRVa

22

RINGa

59

R319A

R318A

R306A

R307A

RL200A

9

10

8

RL200A

4

3

5

R260A

R261A

m

b

m

b

b

m

m

b

VBAT for portA

VBAT for portB

TA

RA

RB

TB

DG

CLK

FH

UHW

DHW

nC_CS0

DIN[0]

DCLK[0]

DOUT[0]

DG

nSIRST

+3.3V

DG

nCDC_INT0

+3.3V

+3.3V

DG

C316A

DG

C300A

C301A

C301B

C313A

C317A

DG

CN201

2

DIAG_T

RL201A

6

7

5

CN201

3

DIAG_R

RL201A

3

2

4

D300A

D300B

C313B

DG

C302A

C303A

C302B

C303B

C318A

R300A

DG

C308B

C309B

L301B

C310B

D301B

1

2

+40V

L300B

R303A

R316B

R314B

R315B

DG

CN201

4

CN201

1

R320A

VBATa

VBATb

J300A

DG

DG

+40V

R310A

J301A

R310B

R304A

C320A

DG

R308A

R309A

R308B

R309B

D305A

C304A

DG

D304A

FG

C305A

D304B

C305B

DG

C304B

FG

D305B

C321A

C321B

C310A

R315A

R316A

C309A

L300A

DG

DG

R314A

D301A

1

2

C308A

L301A

+40V

DG

Q300A

NC

S

1 2 3

G

4

D

5 6 7 8

Q300B

S

1

2

3

G

4

D

5

6

7

8

J699

Q301B

S

D

G

Q301A

S

D

G

C312A

C312B

CN200

26

1

CN200

27

2

C307A

IC300A

TIPa

1

N/C2 2

GPIO2a/SRINGCa 3

GPIO1a/STIPCa 4

SRINGDCa

5

SRINGACa

6

STIPACa

7

STIPDCa

8

CAPPa 9

CAPMa 10

SVBATa

11

SVDC 12

RST 13

INTB/DTXENB 14

FSYNC 15

SDITHRU 16

PCLK 17

DTX 18

DRX 19

SDCHa

20

SDCLa

21

DCDRVa

22

DCFFa

23

DCFFb

24

DCDRVb

25

SDCLb

26

SDCHb

27

VDDD 28

VDDREG

29

CSB 30

SCLK 31

SDO 32

SDI 33

SVBATb

34

CAPMb 35

CAPPb 36

IREF 37

STIPDCb

38

STIPACb

39

SRINGACb

40

SRINGDCb

41

GPIO1b/STIPCb 42

GPIO2b/SRINGCb 43

VDDA 44

N/C45 45

TIPb

46

N/C47 47

RINGb

48

N/C49 49

VBATb

50

N/C51

51

BASEb

52

N/C53

53

BAT_PO

54

BASEa

55

N/C56 56

VBATa

57

N/C58

58

RINGa

59

N/C60

60

EPAD1 61

EPAD2 62

R321A

R318B

R319A

R318A

R319B

R313A

R313B

R306A

R306B

R307A

R307B

RL200B

9

10

8

RL200B

4

3

5

RL200A

9

10

8

RL200A

4

3

5

R317A

R317B

R260A

R261A

R263B

R262B

A

B

Used only Fixed rail
DC/DC convertor

To ASIC

To PLD

m

b

m

b

b

m

m

b

SDCH

SDCL

DCDRV

m

b

b

m

SDCL

SDCH

DCDRV

11

KX-TDA6178X / KX-TDA6178XJ

The SLIC/CODEC (IC300A-W) generates the extension Caller ID signals (FSK signal) with the CPU control.
The data flow is shown below.

• Block Diagram

The input from the main power supply is in 2 voltage levels: +15V, +40V.
Since the voltage levels: +15V, +3.3V, VBATa - VBATx are required onboard, voltage levels are generated onboard as written below.

12

KX-TDA6178X / KX-TDA6178XJ

• Protection of 3.3V output

The protection circuit consists of an output short protection and an overvoltage protection.
When an output of power supply is short, IC1 works to stop the output as the output short protection.
When +3.3V output become overvoltage caused by Q5 short, it is detected by D7. Q3 is cut by Q2 to shut down the input power
supply as the overvoltage protection.

• VBAT Converter

The SLIC/CODEC(IC300A-W) features an PWM controller to control the external DC/DC converter components to generate the
required negative battery voltage (VBAT).
The battery voltage generation circuit tracks the VBAT voltage to the optimal value under each operating state (e.g. on-hook, off-
hook, ringing, etc.) .
Additionally, in the ringing state, the VBAT voltage closely tracks the most negative crest of the TIP and RING ringing waveforms
(trough tracking) in order to further optimize power consumption and dissipation. 

TA

RA

DG

CLK

FH

UHW

DHW

nC_CS0

DIN[0]

DCLK[0]

DOUT[0]

+3.3V

+3.3V

C316A

DG

C300A

C313A

C317A

DG

CN201

2

DIAG_T

RL201A

6

7

5

CN201

3

DIAG_R

RL201A

3

2

4

C313B

DG

C302A

C303A

C302B

C303B

C318A

R300A

R320A

VBATa

J300A

DG

DG

+40V

R310A

J301A

R308A

R309A

R308B

R309B

D305A

C304A

DG

D304A

FG

C305A

C321A

C310A

R315A

R316A

C309A

L300A

DG

DG

R314A

D301A

1

2

C308A

L301A

+40V

DG

Q300A

S

1 2 3

G

4

D

5 6 7 8

J699

Q301A

S

D

G

CN200

26

1

C307A

IC300A

TIPa

1

N/C2 2

SRINGDCa

5

SRINGACa

6

STIPACa

7

STIPDCa

8

SVBATa

11

SVDC 12

FSYNC 15

SDITHRU 16

PCLK 17

DTX 18

DRX 19

SDCHa

20

SDCLa

21

DCDRVa

22

DCFFa

23

DCFFb

24

VDDD 28

VDDREG

29

CSB 30

SCLK 31

SDO 32

SDI 33

STIPDCb

38

STIPACb

39

SRINGACb

40

SRINGDCb

41

VDDA 44

N/C49 49

N/C56 56

RINGa

59

R321A

R319A

R318A

R313A

R306A

R306B

R307A

R307B

RL200A

9

10

8

RL200A

4

3

5

R317A

R260A

R261A

A

To ASIC

To PLD

m

b

m

b

b

m

m

b

SDCL

SDCH

DCDRV

The external DC/DC converter components

13

KX-TDA6178X / KX-TDA6178XJ