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ICD-55
– 7 –
– 8 –
SECTION 4
DIAGRAMS
4-1.
BLOCK DIAGRAM
ADPCM
IC101 (1/2)
MIC
MIC101
ADPCM
IC101 (2/2)
05
•
SIGNAL PATH
: PLAY
: REC
J101
SP101
(SPEAKER)
TONE CONTROL
SWITCH
Q150
3.3V
(ADPCM (IC101) B+)
3.5V
(LED B+)
1.5V
(POWER AMP (IC102) B+)
XSPOWER
XHOLD
TP701
(TEST)
S701 – S705
S706 – S710
D504
D503
(LCD BACK LIGHT)
GRN
OPR
(PLAY)
(REC)
RED
IC706
REAL TIME CLOCK
IC703
X701
32.768kHz
OSCIN
OSCOUT
32KOUT
DSPIS
DSPIR
IR
VFRO
IS
MIC AMP
IC103 (1/2)
MIC SENSE
SWITCH
Q103
AGC CIRCUIT
D101, 102,
Q104
DIVIDER
IC104
LINE MUTING
Q105
POWER AMP
IC102, Q108, 109
EAR
GATE SWITCH
IC705
BUFFER
IC103 (2/2)
L.P.F.
A/D
CONVERTER
DECIMATION
FILTER
L.P.F.
L.P.F.
D/A
CONVERTER
RV101
VOL
INTER-
POLATOR
B.P.F.
COMPRESSOR
EXPANDER
ADPCM
ENCODER
ADPCM
DECODER
AIN2
PCMSO
PCMSI
LEDPB
LEDREC
69
XRESET 84
AMPPO 68
4
67
66
8
1
9
X702
5MHz
X2
X1
80
MSKCLK
18
XBCK
74
SYNCOUT
15
SYNCIN
85
SYNCMSK
16
MICSEL
6
79
MCK
RSYNC
22
29
XSYNC
BCLK
30
31
DIN
EXCK
19 20
DEN
21
14
26
25
8
72
XPDRST
71
XDSPDEN
65
RTCDO
76
RTCCLK
77
RTCDI
75
RTCCE
70
RTCINT
SI
SCLK
SO
CE
INTR
87
XT1
82
4
2
3
7
6
73
LMUTE
5
LPMODE 89
BEEP 21
28
27
PCMRO
PCMRI
24
23
6
FLASH MEMORY
IC702
FMIO0 – FMIO7
S0 – S29
I/O0 – I/O7
14
2
11
3
10
4
17
42
20
XFMSE
40
19
5
7
43
WE
RE
WP
CE
13
41
R/B
XFMCE
XFMWP
XFMRE
XFMWE
91 – 98
18 – 21, 24 – 27
32 – 61
COM0 – COM3
23 – 26
XFMBSY
LED DRIVE
Q506 (1/2)
LED DRIVE
Q506 (2/2)
WAKE UP CONTROL
SWITCH
Q701 – 703
LIGHT 22
KEY0
1
LED DRIVE
Q505
KEY1
2
W
AKEUP
86
TEST
64
ND701
LIQUID CRYSTAL
DISPLAY
OFF
HOLD
S711
C
HOLD
SPDSW
3
FAST
NORMAL
SLOW
S712
PLAY SPEED
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
1P. 1.5V
VOLTAGE
DETECT
IC504
POWER
SWITCHING
Q508
OSC
Q502
DC/DC
CONVERTER
IC502
+3.3V
REGULATOR
IC503
B+ SWITCH
Q106, 107
BATT
BATT B+
BATT B+
100
DC/DC
CONVERTER
IC501
DC/DC CONVERTER
CONTROL
Q507
RESET SIGNAL
GENERATOR
IC505
3.3V
SYSTEM CONTROLLER (IC701), FLASH
MEMORY (IC702), REAL TIME CLOCK (IC703) B+
+
SYSTEM CONTROLLER
IC701
CLE
ALE
SE
XFMCLE
XFMALE
PDN
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