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13

QSPI

FLASH MEMORY

IC2

Reset

Reset

Pin B8

3.0V

Q7

SPEAKER

RECEIVER

MIC

CHARGE

CIRCUIT

Q2,Q3,Q4,

CHARGE

CONTACTS

CHARGE(+)

CHARGE_CTRL

CHARGE

EEPROM

SCL

SDA

BATTERY

TERMINAL

R1

VBAT

BATT-

1.8 V

Q6

1.8 V

LCD

LCD_CS

RS

WRn

RDn

 DAB [0-7]

CPU

Analog

Front

End

D/A

A/D

U8,V8

K3

K2

H1

J3

R2

R1

B12

A13

 M5

M3

K16

J14

J18,J17,J16,L18,M18,N18,P18,P17

P3

C16

ADPCM

Codec

Filter

DSP

Speech

Decoding

Speech

Encoding

BMC

Burst

Decoding

ANT1

Burst

Encoding

RF

PLL

MOD/DEMOD

C1

D1

A4

A5

RXn

ANT1

RXp

TXp

TXn

G1

F1

XTAL

X1

20.736 MHz

BATTERY

T4

ON SWITCH

KEYPAD

DC/DC 

CONVER

TER 

Control

ROWS

COLUMNS

+3.4V

U5, 

T6, V5, 

T7, N1

F3, G2, G3, H2, 

T1

1

V12, U13, V14, 

T12

BBIC

 B15

LCD-BACK  LIGHT

KEY   LED

A9

LDO_CTRL

+ 3.0 V

+3.0V

QSPI

Control

U12

U14

KX-PRSA10 BLOCK DIAGRAM (Handset)

+2.8V

U9,V9

+3.4V

+1.8V

LCD_RESET

E13

DC/DC CONVER

TER

CIRCUIT

 Q9, L4

DC/DC 

CONVER

TER 

CIRCUIT

 Q8, L3

LDO_IO_CTRL

+2.8V

+3.0V

CPU

R4,R7,R8

14

Handset consists of the following ICs as shown in Block Diagram (Handset) (P.13).

• 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 Power Amp.)
- PLL Oscillator
- Detector
- Compress/Expander
- Reception
- Integrated 1.9 GHz PA for DECT

• QSPI FLASH MEMORY: IC2

- Main Program D/L Area

• 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: BATT+) 

 F1  L3  Q8  Q6(1.8V), Q7 (3.0V)

The Reset signal generates IC1 (B8 pin) and 1.8 V.

When charging the handset on the Base Unit, the charge current is as follows;

DC+(5.5 V) 

 R371  R372  D362  CHARGE+(Base)  CHARGE+(Handset)  

 

 Q2  F1  BATTERY+...

Battery... 
BATTERY- 

 R1  GND  CHARGE-(Handset) CHARGE-(Base)  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 Q4 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.11).

“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)   2.25 V ± 50 mV

The BBIC detects this level and "

" starts flashing.

• Power Down

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

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

1.8 V

Reset
(IC1_B8pin)

Battery +

Q3
R4

15

(HANDSET)
from BASE UNIT   ANT - C50 –– IC1 (D1) ––– IC1 (U8, V8) - SP (–)

                                                                                        – IC1 (C1) –  – IC1 (U9, V9) - SP (+)

A                  D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn) 
B - P101
–– IC501 (TXp) - C819 - DA802 –– C894 - ANT1
  – IC501 (TXn)                                C893 - ANT2

SIGNAL ROUTE

ROUTE

IN

OUT

SIGNAL

DTMF TONE
TEL OUT
(to Tel Line)

CDL TX
(to Tel Line)

CDL RX
(from Tel Line)

DTMF TONE
TEL IN
(from Tel Line)

SP-PHONE TX
(to Tel Line)

 SP-PHONE RX
(from Tel Line)

Caller ID
(from Tel Line)

(BASE UNIT)
B - P101 - C106 - R106 - R107 - IC501 (CIDINp)        IC501 (TXp)        C819 - 

   

A - C105 - R105 - R108 - IC501 (CIDINn)                    IC501 (TXn)

(BASE UNIT)
IC501 (LSRp) - C184 - Q161 - Q141 - D101         A

(BASE UNIT)
A                    D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn)

 P101- B

(BASE UNIT)
from HANDSET   ANT1 - C894         DA802        IC501 (RXn) 

 

ANT2 - C893

IC501 (RXp)

IC501 (LSRp) - C184 - Q161 - Q141 - D101        A

 P101- B

B - P101

- C819 -  DA802       C894 - ANT1  to HANDSET

(HANDSET)
from BASE UNIT   ANT - C50 

(BASE UNIT)
A                 D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn)         IC501 (TXp)         
B - P101                                                                                                        IC501 (TXn)

C893 - ANT2

IC1 (D1)
IC1 (C1)

IC1 (K3) - RECEIVER (+)

IC1 (K2) - RECEIVER (–)

DA802 –– C894 - ANT1
              – C893 - ANT2                

 to HANDSET

 to HANDSET

(BASE UNIT)

(HANDSET)
MIC (+) - C10 - IC1 (J3)        IC1(A4)
MIC (–) - C9  - IC1 (H1)          IC1(A5)         C51  - C50 - ANT to BASE

(BASE UNIT)
from HANDSET   ANT1 - C894         DA802        IC501 (RXn) 

ANT2 - C893

IC501 (RXp)

IC501 (LSRp) - C184 - Q161 - Q141 - D101        A

 P101  

 -  B

(HANDSET)
MIC (+) - C10 - IC1 (J3)        IC1(A4)
MIC (–) - C9  - IC1 (H1)          IC1(A5)         C51 - C50 - ANT to BASE

16

SIGNAL ROUTE

ROUTE

IN

OUT

SIGNAL

Memo/OGM
Recording
(from Handset)

ICM Recording
(from Tel Line)

(BASE UNIT)
from HANDSET ANT1 - C894 –– DA802  

IC501 (RXn)  –– 

ANT2 - C893                           IC501 (RXp) 

IC501 (LSRp) - IC601 (5)

(BASE UNIT)
A –––––––– D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn) - IC501 (SPI_DO) - IC601 (5)
B - P101–

Message Play
(to Handset)

(BASE UNIT)
IC601 (2) - IC501 (SPI_DI)       IC501 (TXp)        C819 -

(BASE UNIT)
IC601 (2) - IC501 (SPI_DI) - IC501 (LSRp) - C184 - Q161 - Q141 - D101        A

Message Play
(to Tel Line)

IC501 (TXn)

DA802

 C894 - ANT1

 C893 - ANT2

 to HANDSET

(HANDSET)
from BASE UNIT   ANT -  C50 –– IC1 (D1)

– IC2 (C1)

P101 - B

for KX-PRS120

(HANDSET)
MIC (+) - C10 - IC1 (J3)        IC1(A4)
MIC (–) - C9  - IC1 (H1)          IC1(A5)         C51 - C50 - ANT to BASE

IC1 (U8, V8) - SP (-)
IC1 (U9, V9) - SP (+)