Panasonic KX-NT680RU-B Service Manual ▷ View online
13
KX-NT680 Series
4.2.5.
Analog Circuit
1. Speaker phone call
Transmitting signal is input from microphone MIC4001 (differential amplifier circuit)
input to IC1001-pin L19, M19 A/D
conversion, Gain adjustment and echo cancel by built-in DSP of IC1001.
Receiving signal input from IP Line
Receiving signal input from IP Line
Gain adjustment and D/A conversion by DSP of IC1001 output from IC1001-pin V18,
V19
output to Speaker.
2. Handset call
Transmitting signal is input from handset microphone
input to IC1001-pin M17,M18 A/D conversion, Gain adjustment
and echo cancel by built-in DSP of IC1001.
Receiving signal input from IP Line
Receiving signal input from IP Line
Gain adjustment and D/A conversion by DSP of IC1001 IC1001-pinK18,K19
output to handset speaker.
3. Headset call
Transmitting signal is input from headset microphone
input to IC1001-pin N15 A/D conversion, Gain adjustment and
echo cancel by built-in DSP of IC1001.
Receiving signal input from IP Line
Receiving signal input from IP Line
Gain adjustment and D/A conversion by DSP of IC1001 IC1001-pinL17 output to
headset speaker.
R4029
R4030
IC1001
C4039
R4022
C4037
C4038
C4028
NC
NC
R4023
C4024
C4025
C4013
NC
DG
DG
DG
DG
R4020
C4034
C4033
R4021
R4019
MICBIAS
D4010
D4011
CL_MICP
CL_MICM
C4030
C4031
C4029
R4018
R4017
DG
DG
DG
DG
DG
DG
MIC4001
C4010
D4004
D4005
C4007
C4003
C4004
DG
DG
DG
DG
SPP
SPM
CL_SPP
CL_SPM
L4001
L4002
L4005
L4006
C4011
C4012
DG
DG
L4007
L4008
V19
PAOUTP
V18
PAOUTN
L19
DIFFIN1P
M19
DIFFIN1N
1
2
SP
MIC
R4032
R4031
IC1001
HS_MIC
HS_SP
C4015
C4014
C4017
C4035
C4002
C4008
C4009
DG
DG
DG
DG
D4007
D4008
D4009
MICBIAS
L4003
C4027
C4026
R4012
R4013
L4004
CL_HS_MICP
CL_HS_MICM
CL_HS_SPP
CL_HS_SPM
R4011
D4006
R4007
R4008
R4014
R4015
C4023
C4022
C4021
R4005
R4006
JK4002
2
3
4
5
DG
DG
DG
DG
DG
DG
DG
DG
M18
DIFFIN0P
M17
DIFFIN0N
K18
AMPOUT0
K19
AMPOUT1
R4027
R4028
JK4001 via Flat cable (HEAD)
IC1001
HEADSET
C4019
C4001
R4001
D4002
MICBIAS
CL_HEAD_IN
D4003
R4003
R4010
R4004
CL_HEAD_OUT
R4009
C4018
C4006
C4005
C4020
C4016
AG
HEAD_DET
D4001
HEAD_B1_GND
HEAD_B3_DET
HEAD_B2_IN
HEAD_B5_OUT
HEAD_B4_CAP
DG
DG
DG
DG
DG
DG
DG
C4092
AG
DG
L4011
R4041
N15
SINGIN0
L17
AMPOUT2
R4036
R4016
C4043
DG
14
KX-NT680 Series
4.2.6.
Key Circuit
The key data is under the matrix control by IC1001.
The key information output from KEY_OUT is input into KEY_IN, when the key is pressed.
The HOOK key is independent from Key Scan Matrix and taken into the port singularly.
The key information output from KEY_OUT is input into KEY_IN, when the key is pressed.
The HOOK key is independent from Key Scan Matrix and taken into the port singularly.
4.2.7.
LED Circuit
The lighting of the LEDs is controlled(static lighting) by IC1001.
IC1001
T9
V9
T10
R10
W9
V10
U10
P10
U9
V8
R9
W8
U8
T8
V8
R9
W8
U8
T8
R19
HOOK SW
KEY_IN[0]
KEY_IN[2]
KEY_IN[3]
KEY_IN[4]
KEY_IN[1]
KEY_IN[5]
KEY_IN[6]
KEY_OUT[0]
KEY_OUT[1]
KEY_OUT[3]
KEY_OUT[4]
KEY_IN[7]
KEY_OUT[5]
KEY_OUT[2]
SW7036
SOFT4
1
2
SW7014
4
1
2
SW7032
#
1
2
SW7015
1
1
2
SW7052
PAUSE
1
2
SW7033
9
1
2
SW7016
SOFT2
1
2
SW7053
CANCEL
1
2
SW7035
3
1
2
SW7005
HOLD
1
2
SW7034
6
1
2
SW7006
SOFT1
1
2
SW7025
2
1
2
SW7022
0
1
2
SW7041
TRANSFER
1
2
SW7003
MESSAGE
1
2
SW7011
FLASH
/RECALL
/RECALL
1
2
SW7001
REDIAL
1
2
SW7023
8
1
2
SW7012
*
1
2
SW7026
SOFT3
1
2
SW7024
5
1
2
SW7043
ENTER
1
2
SW7013
7
1
2
SW7044
DOWN
1
2
SW7054
RIGHT
1
2
SW7045
UP
1
2
SW7055
LEFT
1
2
SW7042
FWD
/DND
/DND
1
2
SW7031
SP-PHONE
1
2
SW7004
INTERCOM
1
2
SW7002
MUTE
/AUTO ANS
/AUTO ANS
1
2
SW7051
CONF
1
2
SW7021
AUTO DIAL
/STORE
/STORE
1
2
SW7019
FF8
1
2
SW7029
FF9
1
2
SW7047
FF5
1
2
SW7017
FF2
1
2
SW7007
FF1
1
2
SW7057
FF6
1
2
SW7009
FF7
1
2
SW7059
FF12
1
2
SW7027
FF3
1
2
SW7049
FF11
1
2
SW7037
FF4
1
2
SW7039
FF10
1
2
SW7046
SOFT5
1
2
LED PCB
R6006
R6007
R6001
R6003
R6002
R6005
R6004
3R3V
LED_RED_SP
LED_GRN_RINGER
LED_RED_RINGER
LED_RED_STORE
LED_GRN_INCOM
LED_RED_FWD
LED_RED_CONF
LED_RED_MUTE
D6003
R
D6004
R
D6005
R
D6006
R
D6007
R
DG
Q1001
4.7k
47k
Q1002
4.7k
47k
DG
D6002
R
G
1
2
4
3
D6001
G
D6014
R
LED_L3_R
LED_L2_G
LED_L1_VDD
LED_B3_R
LED_B2_G
LED_B1_VDD
3R3V
R6016
DG
C6035
C6036
C6037
C6038
C6039
C6040
R6008
15
KX-NT680 Series
4.2.8.
ASIC
IC1001 and IC5005 (ASIC) are connected by an I2C communication.
EHS terminals are controlled by IC5005 (ASIC).
EHS terminals are controlled by IC5005 (ASIC).
*This ASIC supports Plantronics and Jabra EHS.
Plantronics control signals : PSB IN/OUT
Jabra control signals : JABRA_UTX/URX
Jabra control signals : JABRA_UTX/URX
The audio signals are exchanged with IC1001 through HANDSET JACK.
4.2.9.
BT(Bluetooth) Module
The BT Module (IC1004) is controlled by IC1001 using serial communication command (IC1004 pin6,9).
This BT Module supports Plantronics and Jabra BT headset (narrow&wide band), voice signals can be transmitted/received
through PCM (IC1004 pin2,3,31,32)
This BT Module supports Plantronics and Jabra BT headset (narrow&wide band), voice signals can be transmitted/received
through PCM (IC1004 pin2,3,31,32)
5V
L2SW_3R3V
Q5004
R5015
Q5003
4.7k
10k
IC5002
1
4
6
5
3
IC5004
1
4
6
5
3
PSB_OUT
ASIC_RST
I2C_SDA
PSB_IN
IC5005
1
INTOUT
2
RESET
14
PSBIN
15
PSBOUT
3
SDL
16
VCC
4
SDA
13
EHS_DET/GPIO3
5
CLKIN
12
UARTTX1
6
CLKOUT/GPIO2
11
UARTRX1
7
TEST
10
GPIO0/UARTTX2
8
GND
9
GPIO1/UARTRX2
EHS_DET
VDD3R3V
JABRA_URX
JABRA_UTX
C5007
ASIC_CLK
ASIC_INT
C5008
I2C_SCLK
L5001
Q5005
10k
10k
R5010
R5011
R5012
R5013
C5006
C5004
DG
DG
DG
DG
DG
DG
DG
DG
DG
IC5003
1
4
2
3
IC5001
1
4
2
3
R5014
C5005
DG
R5016
VDD3R3V
IC1001
ASIC_EHS
EHS_2
E4
U7
R7
G2
R8
JK5001 via Flat cable (EHS)
BT_SYNC
BT_CLK
btu1tx
BT_DIN
BT_DOUT
BT_U1TX
BT_U1RX
BT_DOUT
BT_U1TX
BT_U1RX
BT_CLK
BT_SYNC
BT_DIN
BT_DIN
BT_DOUT
BT_U1RX
BT_U1TX
BT_RST
BT_RST
BT_U1_A
BT_DOUT
BT_DIN
BT_SYNC
BT_CLK
R1074
R1107
R1108
R1106
R1104
R1103
33
BT_U1_B
ST_UCFG0
ST_UCFG1
ST_CKMN1
ST_CKMN0
ST_UCFG2
ST_UCFG3
DG
BT_MDO
DG
BT_TDO
BT_TMS
BT_TCK
BT_SIO
BT_SOT
3R3V
C1070
BT_3.3V
R1146
C1072
DG
C1077
ANT_JP
1
2
L1004
ANT_BT_Short
BT_RST
BT_RST
R1109
T11
U1TX
R11
U1RX
F17
T1SCLK
E18
F1SYNC
D19
D1RX
F15
D1TX
V11
SD_D0
W11
SD_CMD
W10
SD_CLK
R1105
IC1004
15
GND4
20
GND8
21
GND9
22
GND10
23
GND11
24
PIO1
29
SIO0/PIO5
30
SOT0/PIO6
31
PCM_IN
32
PCM_CLK
4
GND2
5
MD0
6
RX
7
GND3
8
X0/PIO3
12
TMS
13
TCK
14
RESETB
17
GND6
18
GND7
19
RF
26
GND12
27
3V
28
GND13
1
GND1
2
PCM_SYNC
3
PCM_DOUT
9
TX
10
TDO
11
RESETC
16
GND5
25
PIO2
SHORT
BT_CLK
BT_SYNC
BT_DIN
BT_DOUT
BT_SYNC
BT_DIN
BT_DOUT
R1075
VDD3R3V
R1077
R1078
R1072
R1076
C1071
R1147
R1148
R1149
R1150
VDD3R3V
C1073
C1074
C1075
C1076
OJ1001
ANT_TP-BT
1
2
DG
IC1001
Pattern Antenna for BT
BT_RST
R1021
G1
MEMCLK
BT
16
KX-NT680 Series
4.2.10.
Power Supply Circuit
RJ45
(LA
N
)
A
C
adaptor
12V
/1
.5
A
10.
6V
12V
5V
Vi
n
EN
LD
O
1.5V
V
DD33V
AVC
C
3
3
V
L
2
S
W
_11V
V
DDI
O
_
DDR
in
te
rn
a
l
D
V
F
9919
V
D
D18V
VD
D
1
.3
V
Vi
n
DCDC
1.1V
EN
L2S
W
_
33V
L2
S
W
EHS
Headset
LE
D
AS
IC
(
J
abr
a)
Handset
MI
C
S
peaker
RJ45
(P
C
)
Po
E_
G
DG
Vi
n
DCDC
5V
EN
Ter
minal
Terminal
VC
C
5
V
45
57
V
3.
3V
Po
E
DCDC
DCI
N
1.
1V
DSS
Vi
n
DCDC
3.3V
EN
NAND
DDR3
I/
O
LCD
BT
M
o
d
u
le
B
a
ckl
ight(
LCD)
DCDC
40mA
AG
E
X
T
_
RE
G
_
CT
L
DCDC
Da
m
p
LD
O
RF
A
P
U
VC
C
_
AN
A
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