Panasonic KX-T7636RU Service Manual ▷ View online
10.7. DXDP COMMUNICATION
Function
This circuit performs the same communication as DXDP-compatible DPT and PBX communication connected with DXDP port.
Circuit Operation
The data to Slave DPT is outputted from pin 63 and 64 of IC5 and sent by Transistor Q8 and Q9.
The data from Slave DPT is inputted to the comparator (pin 61) built in IC5.
The threshold voltage of the comparator is determined by R65 to 67 and inputted to pin 60 and 62.
Also, the supplying power to Slave DPT is controlled by a constant current circuit of Q15 as below.
•
The data from Slave DPT is inputted to the comparator (pin 61) built in IC5.
The threshold voltage of the comparator is determined by R65 to 67 and inputted to pin 60 and 62.
Also, the supplying power to Slave DPT is controlled by a constant current circuit of Q15 as below.
•
•
•
• IC5-pin 58 as H : Constant current circuit ON
•
•
•
• IC5-pin 58 as L : Constant current circuit OFF
•
•
•
• IC5-pin 57 as H : 40mA Feeding (Slave DPT usually)
•
•
•
• IC5-pin 57 as L : 10mA Feeding (Slave DPT at starting up only)
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KX-T7636RU-B
10.8. OPTION DETECTION
When the option is connected with CN3 and CN10, IC3 detects the option connection by the following voltages.
•
•
•
•
• IC3-pin 63 : 3.3V→No option connection with CN3 and CN10
•
•
•
• IC3-pin 63 : 2.1V→Option connection with CN3 only
•
•
•
• IC3-pin 63 : 1.7V→Option connection with CN10 only
•
•
•
• IC3-pin 63 : 1.3V→Option connection with CN3 and CN10
10.9. ANALOG CIRCUIT
This circuit performs the setting of the call path/vol. adjustment in each call mode by DSP built in IC5.
The audio gain of each call is determined by download data from PBX.
•
The audio gain of each call is determined by download data from PBX.
•
•
•
• IC5 sends each audio data to IC4 by PCM interface.
•
•
•
• IC5 receives each audio data from IC4 by PCM interface.
1. Handset Call
Transmitting signal is inputted from handset microphone and amplified by IC4 built-in Amp
→ A/D conversion→inputted to
IC5 in PCM data
→Gain adjustment by DSP of IC5→then sent to PBX.
Transmitting signal inputted from handset microphone is controlled by transmission switching SW IC7 as below.
IC3-pin 52 L : Handset Call
(IC3-pin 52 H : Headset Call)
Receiving signal inputted from PBX is
IC3-pin 52 L : Handset Call
(IC3-pin 52 H : Headset Call)
Receiving signal inputted from PBX is
→Gain adjustment by DSP of IC5→D/A conversion after the input to IC4 in PCM
data
→IC4 built-in Amp output→outputted from IC5 built-in Amp to handset.
2. Headset Call
Transmitting signal is inputted from headset microphone and amplified by IC4 built-in Amp
→ A/D conversion→inputted to
IC5 in PCM data
→Gain adjustment by DSP of IC5→then sent to PBX.
Transmitting signal inputted from headset microphone is controlled by transmission switching SW IC7 as below.
IC3-pin 52 H : Headset Call
(IC3-pin 52 L : Handset Call)
Receiving signal inputted from PBX is
IC3-pin 52 H : Headset Call
(IC3-pin 52 L : Handset Call)
Receiving signal inputted from PBX is
→Gain adjustment by DSP of IC5→D/A conversion after the input to IC4 in PCM
data
→IC4 built-in Amp output→outputted from Q16 (transistor for buffer) to headset.
3. Speakerphone Call
Speakerphone call realizes all double-call by DSP(echo canceller) built in IC5. For a call in the most appropriate condition,
DSP checks voice level of the calling party, acousticity in a room, voice level of the other party and state of the line of
contact, and cancels echo in transmitting and receiving at the start of calling. It operates in a half double-call state in a few
seconds for the check.
DSP checks voice level of the calling party, acousticity in a room, voice level of the other party and state of the line of
contact, and cancels echo in transmitting and receiving at the start of calling. It operates in a half double-call state in a few
seconds for the check.
Transmitting signal is inputted from SP phone mic. and amplified by IC4 built-in Amp
→ A/D conversion→inputted to IC5 in
PCM data
→Gain adjustment by DSP of IC5, then sent to PBX through echo canceller.
Receiving signal inputted from PBX is
→Gain adjustment by DSP through echo canceller of IC5 →inputted to IC4 in PCM
data
→D/A conversion→IC4 built-in Amp output→outputted from IC2(Amp) to speaker.
Power Amp IC2 is controlled as follows;
IC3-pin 51 L
IC3-pin 51 L
→IC2-ON
IC3-pin 51 H
→IC2-OFF
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KX-T7636RU-B
PCM TX
DA
T
A
HANDSET
RX
PCM RX DA
T
A
HANDSET
TX
HEADSET
RX
HEADSET
TX
SP
PHONE RX
SP
PHONE
TX
CN7
1
2
CN6
1
2
L2
JK1
3
SP
2
1
MIC
4
C58
A3.3V
AG
IC2
1
CD
2
FC2
3
FC1
4
Vi
n
5
VO1
6
VCC
7
GND
8
VO2
C38
R26
C33
C27
A3.3V
C21
AG
C41
R32
R33
R34
R30
C40
R29
R31
IC4
GSR1
4
SCLK
13
VREF
24
DR
11
VFR1
5
GST1
3
VFTN1
2
DX
10
BCLK
9
VSS
18
VR1
6
VDD
7
LPC
16
FS
8
DA
T
A
14
12
TNOUT
GST0
21
VFTN0
22
VFR0
19
GSR0
20
VR0
17
CSN
15
VFTP0
23
VFTP1
1
R28
C37
AG
C44
A3.3V
AG
JK4
1
5
4
3
2
AG
R41
R45
R40
CN5
1
HS2SP
2
GND
3
HS2MIC
4
C19
C20
C36
R27
R19
R20
A3.3V
AG
AG
R18
A3.3V
R17
R42
C43
R36
C48
C47
C66
DG
A3.3V
AG
CN4
1
2
3
4
DG
D3.3V
R47
R46
C56
C53
R43
DG
C68
R24
C32
C51
SP1
MIC1
AG1
SP2
AG2
MIC2
MIC3
AG3
SP3+
SP3-
R49
R50
R35
R51
AG
R12
C28
C29
C30
C31
C46
C23
AG
C50
C49
R38
D3.3V
PN9CLK
IC7
1
6
7
5
IC7
8
4
2 3
C108
A3.3V
IC5
OEP/PN9CLK
30
PVSS
5
PVDD
6
RIN
7
PLLO
9
PEP/SCLK
54
PCM2M
53
PSR
52
PSX
50
SPOP
44
SPON
45
SPI
46
PLLI
8
VREF0
43
AV
D
D
47
AG
42
PSYNC
51
CK16M
76
C59
C
111
Q16
R120
R121
AG
C1
12
R128
R124
R125
R126
C144
C42
L3
R130
C146
C126
C125
C124
C147
C120
C35
C142
C121
C123
C122
C148
C149
CLK
DA
T
A
CS
SP
MIC
T
O
HANDSET
ANALOG CIRCUIT
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KX-T7636RU-B
11 IC DATA
11.1. IC5
Pin
No.
I/O Setting
Pull-up
Processing
Contents of Control
Remark
1
WEN
in
Built-in
Write signal
2
REN
in
Built-in
Read signal
3
CSN
in
Built-in
Chip select input
4
INTN
out
-
Interrupt output
5
PVSS
-
-
Ground for DSP PLL
6
PVDD
-
-
Power supply for DSP PLL
7
RIN
in
-
DSP PLL adjustment
8
PLLI
in
-
DSP PLL adjustment
9
PLLO
out
-
DSP PLL adjustment
10
GND
-
-
Digital ground
11
CML5
out
-
LED column drive 5
12
CML4
out
-
LED column drive 4
13
CML3
out
-
LED column drive 3
14
CML2
out
-
LED column drive 2
15
CML1
out
-
LED column drive 1
16
CML0
out
-
LED column drive 0
17
VDD
-
-
Digital power supply
18
GND
-
-
Digital ground
19
NROW9
out
-
LED row drive 9
20
NROW8
out
-
LED row drive 8
21
NROW7
out
-
LED row drive 7
22
NROW6
out
-
LED row drive 6
23
NROW5
out
-
LED row drive 5
24
NROW4
out
-
LED row drive 4
25
NROW3
out
-
LED row drive 3
26
NROW2
out
-
LED row drive 2
27
NROW1
out
-
LED row drive 1
28
NROW0
out
-
LED row drive 0
29
VDD
-
-
Digital power supply
30
OEP
tri
-
Channel pulse
31
OSX
tri
-
2.048MHz serial data output
32
OSR
in
Built-in
2.048MHz serial data input
33
OSYNC
bi
-
8Khz frame synchronized signal
34
OCK2M
bi
-
2.048MHz serial clock (Schmitt)
35
OCK4MN
tri
-
4.096MHz serial clock
36
OP0
out
-
Optional reset output 1
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KX-T7636RU-B
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