Panasonic KX-TS550MEB, Service Manual

Page: 18 / 31

13 CPU DATA
IC
Clock frequency: 3.58MHz
Operating range: 13~100mA
Pin
No.
Symbol Function
Pin
No.
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LS
MFL
RO
V
DD
A
GND
STB
CI
MO
LLC
HS/DP
OSC
MODE
C4
C3
Line Current Sense Input
MF Level Setting
Receive Output
Positive Voltage Supply
Analogue Ground
Side Tone Balance Input
Complex Impedance Pin
Melody Output
Line Loss Compensation
Hook Switch Input and Dial Pulse Output
Oscillator Input
Signalling Mode Select Input
Keyboard Column
Keyboard Column
Symbol
Function
C2
C1
R4
R3
R2
R1
FCI
LED
M1
M2
CS
V
SS
V
SS
LI
RI
Keyboard Column
Keyboard Column
Keyboard Row
Keyboard Row
Keyboard Row
Keyboard Row
Frequency Comparator Input
LED Output Driver
Microphone Input
Microphone Input
Current Shunt Control Output
Negative Power Supply
Line Input
EMC ground connection
Receive Input
V
SS
1
VSS
28
LS 1
MFL 2
RO 3
V
DD
4
A
GND
5
STB 6
CI 7
MO 8
LLC 9
V
SS
V
SS
HS/DP 10
OSC 11
MODE 12
C4 13
C3 14
C2 15
C1 16
R4 17
R3 18
R2 19
R1 20
FCI 21
LED 22
M1 23
M2 24
CS 25
V
SS
26
LI 27
RI 28
U4
U5
C1
C2
C3
C5
C4
C6
18
KX-TS550MEB / KX-TS550MEW