Panasonic KX-TES824UA / KX-TEM824UA / KX-TE82461X / KX-TE82474X / KX-TE82480X / KX-TE82483X / KX-TE82491X / KX-TE82492X / KX-TE82493X / KX-A227X / KX-TES824UAPP / KX-TEM824UAPP Service Manual ▷ View online
11.7. CONTROL CIRCUIT
11.7.1. Composition
The control block is composed of the 16bit CPU(IC700: operating on 23.966MHz system clock from the 47.936MHz external crystal
oscillator), the 8Mbit Flash ROM, the 4Mbit SRAM, and the ASIC for the I/O Port to control the outside line.
The port to control the extension, the clock IC, the address decoder, and other CPU Peripheral circuit are included in the
IC700.Also, the IC700 includes functions such as Extension CID(FSK, DTMF), MODEM sending/receiving, BGM, OGM
recording/playing, DTMF tone, CNG tone, CPT tone, and VOX detection.
The SRAM has a lithium battery to back up information such as speed dial, date, dial data, and system data etc. The battery also
backs up the clock IC in the IC700.
I/O Port to control extension circuit, clock IC, address decoder, and other CPU Peripheral function are included in IC700. And IC700
include the functions as transmission of Extension Caller ID, transmission & receive of MODEM, transmission BGM, recording &
playing of OGM, detect of DTMF tone, CNG tone, CPT tone & VOX.
the SRAM has a lithium battery as back up for protection of the memory of information of such as the speed dial, date, dial data,
and system data, etc. This battery is back up clock IC in IC700 too.
oscillator), the 8Mbit Flash ROM, the 4Mbit SRAM, and the ASIC for the I/O Port to control the outside line.
The port to control the extension, the clock IC, the address decoder, and other CPU Peripheral circuit are included in the
IC700.Also, the IC700 includes functions such as Extension CID(FSK, DTMF), MODEM sending/receiving, BGM, OGM
recording/playing, DTMF tone, CNG tone, CPT tone, and VOX detection.
The SRAM has a lithium battery to back up information such as speed dial, date, dial data, and system data etc. The battery also
backs up the clock IC in the IC700.
I/O Port to control extension circuit, clock IC, address decoder, and other CPU Peripheral function are included in IC700. And IC700
include the functions as transmission of Extension Caller ID, transmission & receive of MODEM, transmission BGM, recording &
playing of OGM, detect of DTMF tone, CNG tone, CPT tone & VOX.
the SRAM has a lithium battery as back up for protection of the memory of information of such as the speed dial, date, dial data,
and system data, etc. This battery is back up clock IC in IC700 too.
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KX-TES824UA / KX-TEM824UA /
11.8. TONE GENERATOR CIRCUIT
11.8.1. Composition
This system has three different tones, 620Hz, 440Hz, 350Hz.
ASIC make the 350Hz, 620Hz and 440Hz square wave signals.
The 350Hz and 440Hz square wave signals are shaped by the low pass filter to sin wave and become tone 1.
On the other hand, 620Hz, square wave signal is shaped by the low pass filter to sin wave and becomes tone 2.
Tone signals 1 and 2 turn ON and OFF at the cross point, thus dial tone, busy tone, and other tones, are produced.
ASIC make the 350Hz, 620Hz and 440Hz square wave signals.
The 350Hz and 440Hz square wave signals are shaped by the low pass filter to sin wave and become tone 1.
On the other hand, 620Hz, square wave signal is shaped by the low pass filter to sin wave and becomes tone 2.
Tone signals 1 and 2 turn ON and OFF at the cross point, thus dial tone, busy tone, and other tones, are produced.
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KX-TES824UA / KX-TEM824UA /
11.9. DTMF GENERATOR CIRCUIT
11.9.1. Composition
DTMF generator is controlled by the 8 bit I/O data of CO G/A. DTMF tone is sent to CO line.
DTMF GENERATOR
R1
R2
R3
R4
C1
C2
C3
C4
TRANSMIT SIGNAL
L
L
L
L
L
L
L
L
DISABLE
H
L
L
L
H
L
L
L
1
H
L
L
L
L
H
L
L
2
H
L
L
L
L
L
H
L
3
L
H
L
L
H
L
L
L
4
L
H
L
L
L
H
L
L
5
L
H
L
L
L
L
H
L
6
L
L
H
L
H
L
L
L
7
L
L
H
L
L
H
L
L
8
L
L
H
L
L
L
H
L
9
L
L
L
H
L
H
L
L
0
L
L
L
H
H
L
L
L
*
L
L
L
H
L
L
H
L
#
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KX-TES824UA / KX-TEM824UA /
11.10. DTMF RECEIVER CIRCUIT
11.10.1. Composition
The DTMF receiver circuit is composes of four DTMF receivers.
IC613 and IC614 are used for the DTMF receivers from SLT connected to the extension.
The DTMF signal is the 4bit parallel data and read by ASIC.
*In case of KX-TEM824, the system have two more DTMF receiver which are in KX-TE82483.
IC613 and IC614 are used for the DTMF receivers from SLT connected to the extension.
The DTMF signal is the 4bit parallel data and read by ASIC.
*In case of KX-TEM824, the system have two more DTMF receiver which are in KX-TE82483.
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KX-TES824UA / KX-TEM824UA /
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