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53

KX-FLC413RU : CORDLESS HANDSET BLOCK DIAGRAM

SPEAKER

RECEIVER

MIC

CHARGE
CIRCUIT

Q4,Q5,Q9
R7

CHARGE
CONTACTS

CHARGE(+)

CHARGE(-)

CHARGE

CHARGE DETECT

EEPROM

SCL

SDA

SWITCHED
SUPPLY

    Q1

Q1

BATTERY
TERMINAL

D7

VBAT1

DC/DC-SWITCH

J1

J2

2.5V

Q3

1.8V

Q2

4.0V

2.5V

1.8V

LCD

RS

RESET

CS

SI

 SCL

CPU

Analog

Front

End

D/A

A/D

30

32

66

67
72

62

52

45

44

 58

56

  59 

 60

6

  9

10

77

ADPCM

Codec

Filter

DSP

Speech

Decoding

Speech

Encoding

BMC

Burst

Decoding

Burst

Encoding

RF

Interface

RF

Module

23

22

RXDA

TXDA

19

26

25

24

RSSI

SYDA
SYEN
SYCL

16

17

XTAL

X1

10.368
MHz

BATTERY

61

ON SWITCH

KEYPAD

ROWS

COLUMNS

1,12,40,76

27,28,34,35,36,74

BBIC

 11

LCD-BACK  LIGHT

KEY-BACK  LIGHT

Ringer LED

 7

75

46

54

Handset consists of the following ICs as shown in Cordless Handset Block Diagram (P.53).

• DECT BBIC (Base Band IC): IC1

- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD)

• RF Module: IC4

- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for transmission and reception

• EEPROM: IC3

- Temporary operating parameters (for RF, etc.)

When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: J1) 

→ F1, L1, D1 → Q2 (1.8 V), Q3 (2.5 V), Q1 (3.3 V)

The Reset signal generates IC1 (66 pin) and 1.8 V.

When charging the handset on the Base Unit, the charge current is as follows;
DC+(6.5V) 

→ R1, R2, R3, R4 → CHARGE+(Charger) → CHARGE+(Handset) → L4 → Q4 → D7 → F1 → BATTERY+...Bat-

tery...Battery- 

→ R45 → GND → L5 → CHARGE-(Handset)→ CHARGE-(Charger) → GND → DC-(GND)

In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q5 of Handset.

"Battery Low" and "Power Down" are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;

• Battery Low

Battery voltage: V(Batt)   2.25V ± 50mV
The BBIC detects this level and "

" starts flashing.

• Power Down

Battery voltage: V(Batt)   2.0V ± 50mV
The BBIC detects this level and power down.

The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.

The power supply is as shown.

55

As for the developing voltage, the DC voltage and AC voltage are overlapped and output from an output terminal.
There is one terminal for transcription output and + and - are switched to be output.

Charge (CHG)

Grid

Developing DC

Transfer (TRA-)

Transfer (TRA+)

Output Characteristics Constant current

Constant voltage

Constant voltage

Constant current
(Variable)

Constant voltage

Nominal Output Voltage 4.25KV

475±10V

220V±15V

100M

Ω

(-800V)

800V±100V

Nominal Output Current 180±15

µA

180

µA

300M

Ω

-8

µA±1µA

(-4

µA~-25µA)

PWM 58%

1000M

Ω

(0.8

µA)

Load Range

(19.4M

Ω)

100M

Ω~2000MΩ

62.5M

Ω~312MΩ

10M

Ω~1000MΩ

Constant Current
Range

4.1~4.6KV

-500V~-2500V

56

When CHG REM becomes “L”, IC604 turns ON the transistor Q614, and Charge BIAS (200

µA) is output from CHG OUTPUT.

GRID BIAS is generated by the current flowing in the GRID circuit via charge wire and GRID.

When CHG REM is “L” and TRA CLK is “open”, Charge BIAS (200

µA) is output from CHG OUTPUT, and at the same time Transfer

(+) BIAS (800V) is output from TRA OUTPUT. When 5.425kHz PWM (Pulse Width Modulation) signal is input to TRA CLK through
transistor Q609, Transfer (-) CURRENT BIAS corresponding to PWM signal is output from TRA OUTPUT.