Panasonic KX-T7440CB / KX-T7440C Service Manual ▷ View online
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5
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KX-T7440C/KX-T7440C-B
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
R3
0
R2
3
R2
2
R2
1
R2
0
R1
3
R1
2
R1
1
R1
0
R0
3
/ INT
4
R0
2
/ INT
3
R0
1
/ INT
2
R0
0
/ INT
1
D
13
/ INT
0
D
12
/ STOPC
D
11
R8
0
R7
3
R7
2
R7
1
R7
0
R6
3
R6
2
R6
1
R6
0
R4
3
/ SO
1
R4
2
/ SI
1
R4
1
/ SCK
1
R4
0
/ EVND
R3
1
/ TOC
R3
2
/ TOD
R3
3
TEST
RE
0
/ VC
ref
OSC
1
OSC
2
RESET
X1
X2
GND
D
0
D
1
D
2
D
3
D
4
D
5
D
9
D
10
R8
1
R8
2
R8
3
R9
0
R9
1
R9
2
R9
3
RA
0
RA
1
SEL
V
CC
RB0
RB1
RB2
RD
0
/ COMP
0
RD
1
/ COMP
1
IC DATA
1. IC3
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6
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KX-T7440C/KX-T7440C-B
Classification Terminal
Pin
Input /
Function
Signal
Number
Output
Power
Vcc
59
Adds the power voltage.
GND
8
Connects.
There is no terminal for the user application.
Connects the Vcc voltage.
Reset
RESET
5
Input
Used to reset the MCU.
These are the input / output terminals for the main
oscillator. Please connect to a ceramic oscillator,
crystal oscillator, or an exterior oscillating circuit.
These are input / output terminals for the save oscillator.
Please connect to a 32.768kHz crystal.
When not using a 32.768kHz crystal oscillator,
set terminal X1 to Vcc and open terminal X2.
There is an addressing input / output terminal for each
byte. D
0
-D
3
terminals can supply a maximum of 10mA
current to each terminal in the source current input /
9~17
output terminal.
D
4
, D
5
, D
9
~
11
terminals can supply a maximum of 15mA
current to each terminal in the sink current input / output
terminal.
These are addressing input terminals for each
byte.
R0
0
~R4
3
Input /
These are addressing input / output terminals for each
R6
0
~RA
1
Output
4 bytes.
RB
02
,RD
01
,RE
0
60~64,1
Input
These are addressing input terminals for each 4 bytes.
INT
0
,INT
1
,
These are the exterior separation input terminals.
INT
2
~INT
4
This input terminal is used to change from the stop
mode to the active mode.
Input /
This is the serial interface clock input terminal.
Serial
Output
Interface
SI
1
38
Input
This is the serial interface receiving data input terminal.
SO
1
39
Output
This is the serial interface sending data output terminal.
TOC,TOD
35,34
Output
These are the timer output terminals.
EVND
36
Input
This is the event input terminal.
COMP
0
,COMP
1
63,64
Input
These are the comparator analog input terminals.
This is the analog input terminal threshold voltage
standard level power terminal.
After setting to the reset position when the stop mode
Frequency
returns to the active mode, this is the terminal which
Division
selects the system lock frequency division comparison.
Comparison
If 4 frequency division is selected, connect to the Vcc
Selector
voltage. If 32 frequency division is selected,
connect to the GND voltage.
TEST
Test
2
Input
OSC
1
Oscillation
3
Input
4
Output
X1
6
Input
X2
7
OSC
2
Output
Port
Input/
Output
Output
D
0
∼
D
5
D
9
∼
D
11
18,19
Input
D
12
,
D
13
20
∼
57
Interrupt
19
∼
23
Input
Stop Clear
STOPC
18
Input
37
SCK
1
Timer
VCref
1
Input
58
SEL
Voltage
Comparator
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7
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KX-T7440C/KX-T7440C-B
BLOCK DIAGRAM
DATA
COMMUNI-
CATION
IC2,Q43,
Q44
T1
TEL JACK
JK1
IC1
IC4
＋
5V
(V1)
＋
5V
(V2)
POWER REGULATOR
D1
＋ ∼
− ∼
TX
RX
PBX
IC3
CPU
4MHz
×
1
KEY
RED
GREEN
22
Ω
120
Ω
RESET
＋
5V
LED
L[0]
∼
L[13]
K[0]
∼
K[8]
RED
GREEN
22
Ω
120
Ω
LED
L[14]
∼
L[27]
C[0]
∼
L[4]
C[0]
∼
L[7]
−
8
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KX-T7440C/KX-T7440C-B
This circuit is used for transmission of a reset pulse to the CPU (IC3) at the following times, connecting the telephone line jack,
circuit operation. The timing chart is shown below.
circuit operation. The timing chart is shown below.
The +16V DC, provided from the DSS console is converted to +5V by the voltage regulator IC (IC1. IC4).
CIRCUIT OPERATIONS
1. RESET CIRCUIT
2. POWER SUPPLY CIRCUIT
1) Circuit Operation
1) Circuit Operation
V1
Q42
R41
IC3
Power ON
Q42 OFF
The reset signal wiu increase
along with the power voltage.
along with the power voltage.
R40
R42
C2
D72
R39
5
D11 zener diode ON
Q42 ON
Negate the reset signal
Start current to C2.
Increase the base voltage of Q42.
Increase the base voltage of Q42.
Reset signal assert.
Reset nagate
Circuit Diagram
Circuit Diagram
+5V(V1)
Q42(Base)
Reset signal
IC3 5
First reset assert
+5V(V1)
+5V(V2)
C8
C7
C6
H
1
2
3
L
D1
IC1
JK1
+
∼
∼
C11
C10
C9
1
2
3
IC4
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