Specifications

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9-2. Power Supply
1. Refer to 9-1. Block Diagram.
2. Common mode coil (EF601) is used to prevent the emission of high frequency noise from AC
Adapter jack.
AC Adapter (7 V)
AD-A70140
Common mode coil (EF601)
D606
Voltage regulator
D601
D-D Converter
IC603 (3 V→5 V)
IC611 (5 V)
Voltage regulator
IC605 (3 V)
Voltage control
circuit
Voltage regulator
IC606 (2 V)
Q602
D605
D607
(5 V)
P5 (from CPU)
V5SYS
(2 V)
V2SYS
(3 V)
P1 to Gate array
Detection of low adapter
voltage (4.4 V)
V3SYS
VLCO
V5EXT (5 V)
APO:OFF
BLD2
to CPU
to CPU
Q624
IC602
Q623
Q604
D604
20.5~23 V
VOUT
TH
D-D
Converter
Q605
EVOL1~EVOL5
from CPU
PORT4 from CPU
FUSE (F601)
Battery (3 V)
IC601
BLD1
Low battery
Forced power off
(2.1 V)
(1.6 V)
APO:OFF
<POWER SUPPLY>
V5EXT: to MODEM
V5SYS: to CPU (Gate array etc.), DC/AC Inverter for
EL, Line receiver/driver
V2SYS: to CPU (Buzzer, Keys etc.)
V3SYS: to CPU (Oscillator etc.), Gate array, Memory,
TAB LSI for LCD
VLCO: to LCD
: P channel MOS-FET
: N channel MOS-FET
: Thermistor (TH)
: Voltage detector
: Electronic variable ohm using analog switch
SD
G
DS
G