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30 SPEAKER RECEIVER MIC 32 66 67 72
Speech Decoding Speech Encoding Burst Decoding Burst Encoding

23 22 19 25 26 24

RXDA TXDA RSSI SYDA SYEN SYCL RF Module

D/A A/D

Analog Front End CHARGE(+) CHARGE CHARGE CIRCUIT CONTACTS Q4,Q5,Q9
R7

ADPCM Codec Filter DSP

RF Interface BMC

CN6

CHARGE

62

16

XTAL X1 10.368 MHz BATTERY ON SWITCH

CHARGE DETECT 52 EEPROM SCL 45 SDA 44 VBAT1 58 17

CHARGE(-) D7 J1 BATTERY TERMINAL J2

IC3

SWITCHED SUPPLY Q1 4.0V

61

DC/DC-SWITCH 56 2.5V 2.5V Q3 59 1.8V 60 1.8V Q2 RS 11 77 6 9 10 7 75 46 BBIC
IC1

CPU

1,12,40,76

ROWS

KEYPAD 27,28,34,35,36,74 COLUMNS

LCD

RESET CS SI SCL

LCD-BACK LIGHT KEY-BACK LIGHT SP-PHONE LIGHT

KX-TCA121 BLOCK DIAGRAM (HANDSET)