Panasonic KX-TG8551RUB / KX-TG8551RUW / KX-TG8552RUB / KX-TG8561RUB / KX-TG8561RUR / KX-TG8562RUW / KX-TGA855RUB / KX-TGA855RUW / KX-TGA855RUR Service Manual ▷ View online
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KX-TG8551RU/KX-TG8552RU/KX-TG8561RU/KX-TG8562RU/KX-TGA855RU
4.2.
Circuit Operation (Base Unit)
4.2.1.
Outline
Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.8).
• DECT BBIC (Base Band IC): IC501
- Handling all the audio, signal and data processing needed in a DECT base unit
- Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM code filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- All interfaces (ex: QSPI FLASH MEMORY, EEPROM, LED, Analog Front End, etc.)
- DCDC Converter
- Integrated 1.9GHz PA for DECT
- Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM code filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- All interfaces (ex: QSPI FLASH MEMORY, EEPROM, LED, Analog Front End, etc.)
- DCDC Converter
- Integrated 1.9GHz PA for DECT
• EEPROM: IC611
- Temporary operating parameters (for RF, etc.)
• FLASH MEMORY: IC601 (for KX-TG8561 only)
- Voice Prompt (TAM) D/L Area
- ICM/OGM Recording Area
- ICM/OGM Recording Area
• Additionally,
- Power Supply Circuit (+3.0 V, +2.4 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
• QSPI FLASH MEMORY IC502
- Main Program D/L Area
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KX-TG8551RU/KX-TG8552RU/KX-TG8561RU/KX-TG8562RU/KX-TGA855RU
4.3.
Block Diagram (Base Unit RF Part)
KX-TG8551/8561 BLOCK DIAGRAM (Base Unit_RF Part)
DA801
ANT2
ANT1
TXON
RXON
RXp
RXn
ANT2
ANT1
TXp
TXn
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KX-TG8551RU/KX-TG8552RU/KX-TG8561RU/KX-TG8562RU/KX-TGA855RU
4.4.
Circuit Operation (Base Unit)
General Description:
(BBIC, Flash Memory, EERROM) is a digital speech/signal processing system that implements all the functions of speechcom-
pression, record and playback, and memory management required in a digital telephone answering machine.The BBIC system
is fully controlled by a host processor. The host processor provides activation and control of all that functionsas follows.
pression, record and playback, and memory management required in a digital telephone answering machine.The BBIC system
is fully controlled by a host processor. The host processor provides activation and control of all that functionsas follows.
4.4.1.
BBIC (Base Band IC: IC501)
• Voice Message Recording/Play back
The BBIC system uses a proprietary speech compression technique to record and store voice message in Flash Memory.An
error correction algorithm is used to enable playback of these messages from the Flash Memory.
error correction algorithm is used to enable playback of these messages from the Flash Memory.
• DTMF Generator
When the DTMF data from the handset is received, the DTMF signal is output.
• Synthesized Voice (Pre-recorded message)
The BBIC implements synthesized Voice, utilizing the built in speech detector and a Flash Memory, which stored the vocabulary.
• Caller ID demodulation
The BBIC implements monitor and demodulate the FSK/DTMF signals that provide CID information from the Central Office.
• Digital Switching
The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to theTele-
phone line, etc. They are determined by the signal path route operation of voice signal.
phone line, etc. They are determined by the signal path route operation of voice signal.
• Block Interface Circuit
RF part, LED, Key scan, Speaker, Telephone line.
4.4.2.
Flash Memory (IC601) (for KX-TG8561 only)
Following information data is stored.
• Voice signal
ex: Pre-recorded Greeting message, Incoming message
4.4.3.
EEPROM (IC611)
Following information data is stored.
• Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
RF part
ADPCM
Analog
Front
End
Front
End
&
Multi-
plexer
Multi-
plexer
TEL
Line
Interface
Line
Interface
Digital
Speech
Processor
Speech
Processor
Caller ID
Modem
Modem
Digital TAM System
Flash Memory IC601
Host CPU
BBIC (IC501)
DECT RF system
TDMA/TDD
Mod/Demod
PA/LNA
TDMA/TDD
Mod/Demod
PA/LNA
ADPCM
Keys/ LEDs/ Charge
EEPROM IC611
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KX-TG8551RU/KX-TG8552RU/KX-TG8561RU/KX-TG8562RU/KX-TGA855RU
4.4.4.
Power Supply Circuit
The power is supplied to the DECT BBIC, QSPI FLASH MEMORY, FLASH MEMORY, EEPROM and Charge Contact from AC
Adaptor (+5.5 V) as shown in Fig.101. The power supply is as follows;
Adaptor (+5.5 V) as shown in Fig.101. The power supply is as follows;
• DECT BBIC (IC501):
DC Jack (+5.5 V)
→ IC302 → IC501
DC Jack (+5.5 V)
→ IC302 → Q302 → IC501
DC Jack (+5.5 V)
→ IC302 → Q301 → IC501
• EEPROM (IC611):
DC Jack (+5.5 V)
→ IC302 → IC501→ IC611
• FLASH MEMORY (IC601) (for KX-TG8561 only):
DC Jack (+5.5 V)
→ IC302→ IC501→ IC601
• Charge Contact (CHARGE+):
DC Jack (+5.5 V)
→ R371 → R372 → D362→ CHARGE+
• QSPI FLASH MEMORY (IC502):
DC Jack (+5.5 V)
→ IC302 → IC501 → IC502
<Fig.101>
AC Adaptor
* for KX-TG8561 only
DCP
IC302
Q302
IC501
IC502
IC601*
IC611
+5.5 V
1.8 V
3.0 V
3.0 V
Q301
2.4 V
CHARGE+
D362
R372
R371
DC
Jack
2.85 V
DCM
1
2
3
On
DC
S
1.8 V
Reset
(IC501(RSTN))
Off
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