Read Panasonic KX-TCD953RUB (serv.man2) Service Manual online
9 CIRCUIT OPERATION (HANDSET)
9.1. THE BASE-BAND SECTION (SEE BLOCK DIAGRAM Fig. 25)
9.1.1. INTRODUCTION
The base-band section consists of a base-band integrated circuit (BBIC), a Flash PROM, an EEPROM, an LCD Display, a
Microphone, an Earpiece, and power supply/battery management circuits.
Microphone, an Earpiece, and power supply/battery management circuits.
9.1.2. THE BASE-BAND INTEGRATED CIRCUIT (BBIC)
The National SC14405 BBIC (IC1) is a CMOS device designed to handle all the audio, signal and data processing needed in a
DECT handset. It contains two microprocessors - one general purpose - while the other burst mode controller takes care of DECT
specific physical layer and radio section control.The BBIC also contains the ADPCM transcoders, a low power 14 bit codec
(ADC/DAC), various other ADCs, DACs and timers, a UART for data communication with RF unit, a gaussian filter for the DECT
GFSK modulation method, clock and data recovery circuits, a clock oscillator circuit, a battery management circuit, and a pair of
gaincontrollable amplifiers for the microphone and earpiece.
DECT handset. It contains two microprocessors - one general purpose - while the other burst mode controller takes care of DECT
specific physical layer and radio section control.The BBIC also contains the ADPCM transcoders, a low power 14 bit codec
(ADC/DAC), various other ADCs, DACs and timers, a UART for data communication with RF unit, a gaussian filter for the DECT
GFSK modulation method, clock and data recovery circuits, a clock oscillator circuit, a battery management circuit, and a pair of
gaincontrollable amplifiers for the microphone and earpiece.
9.1.3. LCD DISPLAY, AND DISPLAY DRIVER (SEE Fig. 26)
The LCD display also receives data via a serial interface. Serial data is sent to LCD display on pin 3 (TP70). The RS signal (pin
1, TP67) is used by the BBIC to send either commands or data.
1, TP67) is used by the BBIC to send either commands or data.
Circuit Diagram
23
KX-TCD953RUB
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