Read Sony ICD-B100 / ICD-B200 Service Manual online
18
ICD-B100/B200
• IC Pin Function Description
IC703
IC703
µ
PD780308GC-A77-8EU (MEMORY CONTROL, SYSTEM CONTROL) (MAIN BOARD)
Pin No.
Pin Name
I/O
Description
1,2
KEY1, KEY2
I
Key signal input
3
DC-IN
I
Not used. (Open)
4
HOLD
I
Hold switch signal input
5
AMPPOW
O
Power down control signal output to the power amplifier IC (IC104)
6
AVREFON
I
A/D reference voltage input
7
XFMCE
O
Chip enable signal output to the flash memory IC (IC701)
8
VDD0
—
Power supply pin (+3.3 V)
9
AVREF
—
A/D reference voltage
10
XFMWE
O
Write enable signal output to the flash memory IC (IC701)
11
XFMALE
O
ALE signal output to the flash memory IC (IC701)
12
VSS1
—
Ground pin
13
XFMR/B
I
Ready/Busy signal input from the flash memory IC (IC701)
14
XFMCLE
O
CLE signal output to the flash memory IC (IC701)
15
HPJACK
O
Headphone detect signal input Not used in this set. (Open)
16
HPMUTE
O
Headphones mute switch
17
XFMRE
O
Read enable signal output to the flash memory IC (IC701)
18
KEY3
I
Key signal input
19
XFMWP
O
WP signal output to the flash memory IC (IC701)
20
HPAMPPOW
O
Power down control signal output to the headphones amplifier (Open)
21
BEEP
O
Beep signal output (2.4 kHz)
22
MICSENSE
O
Microphone sensitivity select (H: Conference, L: Dictation)
23 to 26
COM0 to COM3
O
LCD common signal output
27
BIAS
O
Connect to VDD. (LCD bias)
28 to 30
VLC0 to VLC2
—
LCD drive power supply pin
31
VSS0
—
Ground pin
32 to 63
S0 to S31
O
LCD segment signal output
64
XTEST
I
Test pin
65
DSPPOW
O
Digital signal processor registor control I/F enable signal output
66
LEDREC
O
OPR (REC) LED (D701: red) ON/OFF signal output
67
LEDPB
O
OPR (PLAY) LED (D701: green) ON/OFF signal output
68
RTCCE
O
Real time clock chip enable signal output
69
XDSPIFRQ
O
I/F request signal output to the DSP IC (IC101)
70
DSPIFRW
O
I/F data read/write signal output to the DSP IC (IC101)
71
XDSPRST
O
Reset signal output to the A/D, D/A converter, DSP IC (IC101)
72
SI0
I
I/F data signal input to the DSP IC (IC101)
73
SO0
O
I/F data signal output to the DSP IC (IC101)
74
SCK0
O
I/F signal clock output to the DSP IC (IC101)
75
RTCDI
I
Real time clock data signal input
76
RTCDO
O
Real time clock data and digital signal processor registor control data output
77
RTCCLK
O
Real time clock I/F data and digital signal processor registor control clock output
78
IC
—
Connect to ground.
79
X2
O
System clock output (5 MHz)
80
X1
I
System clock input (5 MHz)
81
VDD1
—
Power supply pin
82
XT1
—
Sub clock input (32.768 kHz)
83
XT2
—
Not used in this set. (Open)
84
XRESET
I
Reset signal input
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