![background image](http://html.mh-extra.com/html/panasonic/kx-t7453/kx-t7453_service-manual_270032012.webp)
RXD
22
TTL
input
PCM
interface
Input terminal for PCM data.
TXD
23
output
Output terminal for PCM data
-FSYNC
24
TTL
input
Input terminal of Sync. signal for PCM interface. The frequenc
of input sync.
signal is 8 kHz.
BCLK
25
Input terminal of shift clock pulse for PCM deta. Input pulse
frequency range is 64 kHz~2.048 kHz.
PCM data (TXD termianl signal) is output st the positive edge.
PCM data (RXD terminal signal) is sampled at the negative ed
The sameling is performed inside LSI.
MCLK
26
Output
Clock
Clock pulse output terminal. Output pulse frequency is
6.144MHz.
System reset (inputting “0” to -RESET terminal) doesn’t stop
this output.
CLKO
27
Clock pulse output terminal which has selective frequencies.
The following 4 frequencies can be selected by resistor settin
12.228, 4.096, 2.048, 1.536 (MHz).
System reset (inputting “0” to -RESET terminal) selects the
frequency of 1.536MHz and doesn’t stop this output.
DG2
28
---
Power
supply, etc.
Ground terminal of digital circuit.
OSCI
29
---
Clock
Input terminal of oscillation circuit.
Connect the oscillator and resistor berween this terminal and
pin 30 (OSCO), moreover, connect the capacitor between this
terminal and digital ground to make the oscillation circuit.
OSCO
30
---
Output terminal of oscillation circuit.
Connect the oscillator and resistor berween this terminal and
pin 29 (OSCI), moreover, connect the capacitor between this
terminal and digital ground to make the oscillation circuit.
D5V2
31
---
Power
supply, etc.
5V power supply terminal of digital circuit.
-INT
44
Output
Micro-
computer
interface
Outputs 8 kHz clock pulse which is synchronized with -FSYNC
TEST
45
CMOS
input
Power
supply, etc.
Test terminal
Connect to the digital ground.
A5V3
46
---
5V power supply terminal of analog circuit.
HI
47
Analog
input
Analog
Input terminal of TX handset signal.
Either this signal or the signal supplied to pin 49 (HI) is input
AD converter.
VBB
48
---
Power
supply, etc.
Reference voltage terminal of AD converter.
Connect the capacitor of 10 F between VBB terminal and p
50 (AG3).
MI
49
Analog
input
Analog
Input terminal of TX microphone signal.
Either this signal or the signal supplied to pin 47 (HI) is input
AD converter.
12
Summary of Contents for KX-T7453
Page 7: ...5 IC DATA 5 1 IC1 7 ...
Page 10: ...10 ...
Page 15: ...15 ...
Page 21: ...The reset signal is negledted 21 ...
Page 26: ...8 2 THE LCD DOES NOT OPERATE 26 ...
Page 28: ...8 5 SPEAKER PHONE TROUBLE 8 6 TONE DIAL TROUBLE 8 7 HANDSET TROUBLE 28 ...
Page 29: ...9 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 29 ...
Page 33: ...13 ACCESSORIES AND PACKING MATERIALS 33 ...
Page 39: ... 39 ...
Page 41: ...41 ...
Page 43: ...43 ...
Page 48: ...1 5 2 6 3 7 4 8 ...
Page 49: ...9 13 10 14 11 15 12 16 ...
Page 50: ...17 21 18 22 19 23 20 24 ...
Page 51: ...33 34 35 36 25 32 ...
Page 57: ...SW301 CN301 1 2 3 ...