Panasonic KX-TDA6178X / KX-TDA6178XJ (serv.man3) Service Manual / Supplement ▷ View online
8
KX-TDA6178X / KX-TDA6178XJ
1.3.2.4.
2W-4W Conversion
It converts 4W-VOX signal used in the PBX to 2W-VOX signal used in SLT, and vice versa. It consists of an operational amplifier in
the SLIC and a balanced network (B/N) in the CODEC. It can control the return loss of the audio data and frequency characteristics.
By modifying the CODEC program, it can match the corresponding impedance.
the SLIC and a balanced network (B/N) in the CODEC. It can control the return loss of the audio data and frequency characteristics.
By modifying the CODEC program, it can match the corresponding impedance.
1.3.2.5.
DTMF Signal Detection
Each port has its own DTMF receiver in the codec.
Detection of DTMF signal by Codec transmits this data to the MPR via the PLD.
Via the PLD, MPR reads the DTMF signal which is received in the Codec.
Detection of DTMF signal by Codec transmits this data to the MPR via the PLD.
Via the PLD, MPR reads the DTMF signal which is received in the Codec.
1.3.2.6.
Power Supply
Voltage and current generated by the SLIC is supplied to the phones.
Preset voltage is -26V (On-hook).
Current is set as 26mA (Off-hook).
Preset voltage is -26V (On-hook).
Current is set as 26mA (Off-hook).
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
2W-VOX
Audio codec
DSP
PCM I/F
SPI I/F
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
NC
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
DTMF signal
Audio codec
DSP
PCM I/F
SPI I/F
TA
RA
C313A
CN201
2
DIAG_T
RL201A
6
7
5
CN201
3
DIAG_R
RL201A
3
2
4
C313B
DG
C302A
C303A
C302B
C303B
VBATa
J300A
DG
DG
R310A
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
Q301A
S
D
G
CN200
26
1
C307A
IC300A
TIPa
1
SRINGDCa
5
SRINGACa
6
STIPACa
7
STIPDCa
8
SVBATa
11
SDCHa
20
SDCLa
21
DCDRVa
22
DCFFa
23
DCFFb
24
STIPDCb
38
STIPACb
39
SRINGACb
40
SRINGDCb
41
RINGa
59
R319A
R318A
R313A
R306A
R306B
R307A
R307B
RL200A
9
10
8
RL200A
4
3
5
R317A
R260A
R261A
m
b
m
b
b
m
m
b
SDCL
SDCH
DCDRV
TIP
RING
0
-26V
9
KX-TDA6178X / KX-TDA6178XJ
1.3.2.7.
Hook Detection
The SLIC/CODEC(IC300A-W) provides a programmable off-hook detection mechanism.
The off-hook detection scheme provides two unique thresholds to allow hysteresis, and also includes a programmable debounce fil-
ter to eliminate false detection.
The off-hook detection scheme provides two unique thresholds to allow hysteresis, and also includes a programmable debounce fil-
ter to eliminate false detection.
1.3.2.8.
Ring Trip Feature
During ringing, the ring current is permanently sensed by the SLIC/CODEC(IC300A-W).
When the handset of a ringing telephone is picked up, the current is compared against the programmed ring trip threshold.
If it is above the programmed ring trip threshold, the ringing signal automatically stop and move to the off-hook status.
When the handset of a ringing telephone is picked up, the current is compared against the programmed ring trip threshold.
If it is above the programmed ring trip threshold, the ringing signal automatically stop and move to the off-hook status.
1.3.2.9.
Surge Protection
Thyristor is installed between T or R and FG protect from extraneous surge.
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
NC
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
TIP
RING
On-hook
Off-hook
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
NC
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
TIP
RING
Ringing
Off-hook
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
10
KX-TDA6178X / KX-TDA6178XJ
1.3.2.10. Power Failure Switch Feature
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.
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.
1.3.2.11. Bell Signal Generator and transmission
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).
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
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
1.3.2.12. EXT-CID Transmission
The SLIC/CODEC (IC300A-W) generates the extension Caller ID signals (FSK signal) with the CPU control.
The data flow is shown below.
The data flow is shown below.
1.3.2.13. Power Supply Voltage Generator
• 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.
Since the voltage levels: +15V, +3.3V, VBATa - VBATx are required onboard, voltage levels are generated onboard as written below.
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