Cpu Data - Panasonic KX-TS2350CAB Service Manual

KX-TS2350CAB / KX-TS2350CAC / KX-TS2350CAH / KX-TS2350CAR / KX-TS2350CAW

9 CPU DATA

C2 C3
U5
1
Pin
Symbol
No.
LS Line Current Sense Input
1
MFL MF Level Setting
2
RO
Receive Output
3
V Positive Voltage Supply
4
DD
A Analogue Ground
5
GND
STB Side Tone Balance Input
6
CI Complex Impedance Pin
7
MO
Melody Output
8
LLC Line Loss Compensation
9
HS/DP
Hook Switch Input and Dial Pulse Output
10
OSC Oscillator Input
11
MODE Signalling Mode Select Input
12
C4 Keyboard Column
13
C3
Keyboard Column
14
C2
Keyboard Column
15
C1 Keyboard Column
16
R4
17 Keyboard Row
R3 Keyboard Row
18
R2
Keyboard Row
19
R1 Keyboard Row
20
FCI Frequency Comparator Input
21
LED
LED Output Driver
22
M1 Microphone Input
23
M2
Microphone Input
24
CS Current Shunt Control Output
25
V
26 Negative Power Supply
SS
LI Line Input
27
RI
Receive Input
28
V EMC ground connection
VSS
SS
(IC1)
C1
VSS
Function
This is the input for sending the line current.
A voltage divider connected from this pin to A GND and VSS can be used to set the DTMF level.
This is the output for driving a dynamic earpiece with an impedance of 140 to 300
This is the supply pin for the circuit.
This is the analog(ue) ground for the amplifiers.
This is the input for side tone cancellation.
For complex impedance a capacitor should be connected to this pin.
PDM output of the melody generator for tone ringing. Hi-Z when not active.
Select pin for line loss compensation.
LLC = AGND: 20-50 mA
This is an I/O that is pulled high by the hook switch when off-hook and an open
drain pulls it low during break periods of pulse dialing and flash.
Pin for ceramic resonator (3.58 MHz).
During temporary MF : 82/160 ms
(see key arrangement in Schematic Diagram) the scanning to the key.
(see key arrangement in Schematic Diagram) the scanning to the key.
This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.
Output for driving an LED that will be flashing when in Programme.
Differential inputs for the microphone (electric).
This N-channel open drain output controls the external high power shunt transistor
for the modulation of the line voltage and for shorting the line during make period
of pulse dialing.
This input is used for power extraction and line current sending.
This is the input for the receive signal.
U4
C5 C4 C6
Description
LLC = VDD: 45-75 mA
Mode pin Function
Row 2 mode, 10 pps, 40/60 ms
Row 6 MF only, 82/82 ms
16
Clock frequency: 3.58MHz
Operating range: 13~100mA
28
LLC = VSS: none.