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7 CIRCUIT OPERATION (BASE UNIT)
BLOCK DIAGRAM BASE - BAND SECTION AND LINE INTERFACE
KX-TCD775RUS BLOCK DIAGRAM (BASE UNIT)
Audio
Hook
Switch
Switch
16kHz
Filter
Filter
Bridge
Rect.
Rect.
A/D
D/A
Analog
Front End
Front End
Buzzer
CPU
HOOK
RXAF
TXAF
CHARGE PULSE
DSP
BMC
Speech Encoding
Speech Decoding
RF
Interface
Burst Building
Burst Decoding
ADPCM
Codec Filter
Codec Filter
EEPROM
IC9
SDA
SCL
SYRI
RSSI
ANT2
SYEN
SYEN
ANT1
RXDA
TXDA
J2
J1
PMB5737
IC6
IC6
3.3V
Reg.
Reg.
2.65V
Reg.
Reg.
3.3V
2.65V
VUNREG
27
26
133
123
123
75
63
81
12
20
20
139
5
22
25
25
18
5
6
13
RF
Module
Module
20
11
12
1
35
17
12
1
35
17
44
37
CHARGE
CONTACT
7
5
XTAL
10.368
MHz
MHz
ADDRESS
DATA
CTRL
Flash
PROM
PROM
A0..
A17
A17
D0..
D7
D7
29
30
TXAF
RING
136
142
Ring
Det.
Det.
Tax
Det.
Det.
Clip
Det.
Det.
71
Page
Serial Flash ROM
IC8
103 104 105
106
107
1
11 14 13 12
SCK
SI
SO
CS
RDY/
BUSY
BUSY
IC5
Fig. 17
7.1. The Base - Band Section
7.1.1. Introduction (See Fig. 17)
The base-band section consists of a base-band integrated circuit (BBIC), a Flash PROM, an EEPROM and serial FLASH ROM.
The circuits included clock generation, locator key, factory serial port, buzzer circuit and audio paths both TX and RX.
The circuits included clock generation, locator key, factory serial port, buzzer circuit and audio paths both TX and RX.
7.1.2. The Base - Band Integrated Circuit (BBIC)
The PMB5737 (IC6) is a CMOS device designed to handle all the audio, signal and data processing needed in a DECT
baseunit. It contains a "burst mode controller" which takes care of DECT specific physical layer and radio section control. It also
contains an ADPCM codec filter used for speech encoding and decoding in the DSP section, a general purpose
microcontroller,various other ADCs, DACs, timers and power control circuitry.
The BBIC interfaces to its external PROM (IC5) via a data/address/control bus. It connects to the EEPROM via a serial
interface, and a second serial interface is used during manufacture and service to connect to an external computer.
It connects to Serial Flash ROM via serial interface.
baseunit. It contains a "burst mode controller" which takes care of DECT specific physical layer and radio section control. It also
contains an ADPCM codec filter used for speech encoding and decoding in the DSP section, a general purpose
microcontroller,various other ADCs, DACs, timers and power control circuitry.
The BBIC interfaces to its external PROM (IC5) via a data/address/control bus. It connects to the EEPROM via a serial
interface, and a second serial interface is used during manufacture and service to connect to an external computer.
It connects to Serial Flash ROM via serial interface.
7.1.3. FLASH PROM (See Fig. 18)
The 2 Mbit (IC5) Flash PROM contains the operational firmware for the microcontolloer. It is interfaced to the
data/adress/control bus using address lines A0 to A17, data lines D0 to D7, and chip select (pin 30), output enable (pin 32), and
write (pin 7).
data/adress/control bus using address lines A0 to A17, data lines D0 to D7, and chip select (pin 30), output enable (pin 32), and
write (pin 7).
7.1.4. EEPROM (See Fig. 18)
The electrically erasable PROM AT24C128N(IC9) is used to store all the temporary operating parameters for the base (see
EEPROM LAYOUT). It uses a two-line serial data interface with the BBIC, with bi-directional data on pin 5 (TP104), and clock
on pin 6 (TP103).
EEPROM LAYOUT). It uses a two-line serial data interface with the BBIC, with bi-directional data on pin 5 (TP104), and clock
on pin 6 (TP103).
16
KX-TCD775RUS
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