Read Sony XR-CA650X Service Manual online
25
XR-CA650X
6-10.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501 MN101C49KSC1 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
VREF–
I
Reference voltage (0V) input terminal (for A/D converter)
2
VSM
I
FM and AM signal meter voltage detection signal input from the tuner unit (A/D input)
3
NIL
I
Not used
4, 5
KEYIN1,
KEYIN0
I
Key input terminal (A/D input)
6
RCIN0
I
Rotary remote commander key input terminal (A/D input)
7, 8
NIL
I
Not used
9
DSTSEL
I
Destination setting terminal Fixed at center voltage in this set
10
VREF+
I
Reference voltage (+5V) input terminal (for A/D converter)
11
VDD
—
Power supply terminal (+5V)
12
OSCOUT
O
Main system clock output terminal (18.432 MHz)
13
OSCIN
I
Main system clock input terminal (18.432 MHz)
14
VSS
—
Ground terminal
15
XI
I
Sub system clock input terminal (32.768 kHz)
16
XOUT
O
Sub system clock output terminal (32.768 kHz)
17
MMOD
I
Selection signal of memory mode input terminal
“L”: single chip mode (fixed at “L” in this set)
“L”: single chip mode (fixed at “L” in this set)
18
LCDSO
O
Serial data output to the liquid crystal display driver
19
LCDCE
O
Chip enable signal output to the liquid crystal display driver “H” active
20
LCDCKO
O
Serial data transfer clock signal output to the liquid crystal display driver
21 to 23
NCO
O
Not used
24
SYSRST
O
Reset signal output to the SONY bus interface “L”: reset
25
BUSON
O
Bus on/off control signal output to the SONY bus interface “L”: bus on
26
KEYACK
I
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
and eject keys in the power off status On at input of “H”
and eject keys in the power off status On at input of “H”
27
NIL
I
Not used
28
BUIN
I
Battery detection signal input from the SONY bus interface
“L” is input at low voltage
“L” is input at low voltage
29
SIRCS
I
SIRCS remote control signal input from the remote control receiver
30, 31
NIL
I
Not used
32
VDD2
—
Power supply terminal (+5V)
33
RESET
I
System reset signal input from the reset signal generator and reset switch
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
34
TUNON
O
Tuner system power supply on/off control signal output “H”: tuner power on
35
BEEP
O
Beep sound drive signal output to the power amplifier
36
PW_ON
O
Main system power supply on/off control signal output “H”: power on
37
NCO
I
Not used
38
ACCIN
I
Accessory detection signal input “L”: accessory on
39
NCO
O
Not used
40
TELATT
I
Telephone attenuate signal input terminal At input of “H”, the signal is attenuated by –20 dB
Not used
Not used
41
VPP
I
Not used
42
BUSSO
O
Serial data output to the SONY bus interface
43
BUSSI
I
Serial data input from the SONY bus interface
44
BUSCKO
O
Serial data transfer clock signal output to the SONY bus interface
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