Read Sony ICD-80 Service Manual online
– 16 –
4-4.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC701 MN102L25DSD (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
PO PMUT
O
Gain down muting on/off control signal output to the power amplifier (IC105) “H”: muting on
2
PO LPCI
O
Not used (open)
3
POA PDN
O
Power down control signal output to the MSM7560LGS (IC101) “L”: power down
4
POA RES
O
Reset signal output to the MSM7560LGS (IC101) “L”: reset
5
PO MIC
O
Microphone sensitivity selection signal output for the microphone input “L”: low, “H”: high
6
POR CE
O
Chip enable signal output to the flash memory (IC702)
7
PIR R/B
I
Ready/busy monitor input from the flash memory (IC702)
8
PI ERS
I
ERASE switch (S702) input terminal When the key pressing “L”
9
PI HOLD
I
9 HOLD switch (S704) input terminal “L”: hold on, “H”: hold off
10
PI VOR
I
Detect whether audio signal is entered or not input from the VOR detection circuit (IC104)
“L”: signal is entered, “H”: no signal entered
“L”: signal is entered, “H”: no signal entered
11
PI DET3
I
Power supply voltage detection input of the back-up power supply
12
PO MUTE
O
Line muting on/off control signal output terminal “H”: line muting on
13
PO BOT
O
Power on/off section signal output of the back-up power supply “H”: power on
14
PO BACK
O
Connection control signal output of the back-up power supply
15
PO REGU
O
Power supply voltage detection input of the +3.3V and mic circuit power supply
“H”: power on
“H”: power on
16
PO DDC
O
Power on/off control signal output of the DC/DC converter “H”: power on
Not used (open)
Not used (open)
17
VDD
—
Power supply terminal (+3.4V)
18
SYSCLK
O
Not used (open)
19
VSS
—
Ground terminal
20
XI
I
Sub system clock input terminal (32.768 kHz)
21
XO
O
Sub system clock output terminal (32.768 kHz)
22
VDD
—
Power supply terminal (+3.4V)
23
OSCI
I
Main system clock input terminal (10.368 MHz)
24
OSCO
O
Main system clock output terminal (10.368 MHz)
25
MODE
I
Setting terminal for the CPU operational mode (fixed at “H” in this set)
26
POL REC
O
LED drive signal output of the OPR REC indicator (red) “H”: LED on (recording mode)
27
POL PLY
O
LED drive signal output of the OPR PLAY indicator (green) “H”: LED on (play mode)
28
—
O
Not used (open)
29
—
O
Not used (open)
30
PO LIGH
O
LED drive signal output of the LCD back light “H”: LED on
31
PO ACK
O
Acknowledge signal output to the equipment connected to digital I/O connector (CN703)
32
PO OPT
O
OPT control signal output to the equipment connected to digital I/O connector (CN703)
33
PO WLOK
O
Output of enable control signal when loading serial data from the equipment connected to digital I/O
connector (CN703) “H” active
connector (CN703) “H” active
34
VDD
—
Power supply terminal (+3.4V)
35
—
O
Not used (open)
36
—
O
Not used (open)
37
—
O
Not used (open)
38
PI WLNK
I
For detecting the connection of the equipment connected to digital I/O connector (CN703)
“L”: connection (link), “H”: no connection
“L”: connection (link), “H”: no connection
39
PI COM0
I
Link data (0) input from the equipment connected to digital I/O connector (CN703)
40
PI COM1
I
Link data (1) input from the equipment connected to digital I/O connector (CN703)
41
PI COM2
I
Link data (2) input from the equipment connected to digital I/O connector (CN703)
42
PI COM3
I
Link data (3) input from the equipment connected to digital I/O connector (CN703)
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