Sony XR-CA300 Service Manual page 42

XR-CA300/CA320/CA320X
IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC1 MN101C49GTH1 (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
1 VREF – — Reference voltage (0V) terminal (for A/D converter)
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
2 VSM I
(A/D input)
3 to 6 NCI I Not used (fixed at "L")
7 NOISE-DET I
Not used (fixed at "L")
8 MPTH I Not used (fixed at "L")
9 NCI I Not used (fixed at "L")
10 VREF + —
Reference voltage (+5V) terminal (for A/D converter)
11 VDD — Power supply terminal (+5V)
12 OSC2
O Main system clock output terminal (18.432MHz)
13 OSC1 I Main system clock input terminal (18.432MHz)
14 VSS — Ground terminal
15 XI I
Sub system clock input terminal (32.768kHz)
16 XO O Sub system clock output terminal (32.768kHz)
17 MMOD I
Setting terminal for the single chip mode
18 LCD-SO (TX) O
LCD serial data output to the liquid crystal display driver (IC900)
19 LCD-SI (RX) I LCD serial data input from the liquid crystal display driver (IC900)
20 LCD-CKO O
LCD serial transfer clock signal output to the liquid crystal display driver (IC900)
21 PLL-SO O Serial data output to the FM/AM PLL (IC3)
22 PLL-SI I Serial data input from the FM/AM PLL (IC3)
23 PLL-CKO O
Serial data transfer clock signal output to the FM/AM PLL (IC3)
24 LCD-RES O LCD reset signal output to the liquid crystal display driver (IC900) "L": reset
25 LCD-CE O
Chip enable signal output to the liquid crystal display driver (IC900) "H" active
26 KEYACK I Key acknowledge signal detect input from the liquid crystal display driver (IC900)
27 DAVN-RDS I Not used (fixed at "L")
Battery detect signal input from the SONY bus interface (IC800) and battery detect circuit
28 B/U-IN I
"L" is input at low voltage
29 NCI I Not used (fixed at "L")
Internal RAM reset detection signal input terminal
30 RAM BU I
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset
31 TEST-IN I Setting terminal for the test mode "L": test mode, Normally: fixed at "H"
32 I
NCI Not used (fixed at "L")
System reset signal input from the reset signal generator (IC2) and reset switch (S1)
33 RESET I
"L": reset "L" is input for several 100 msec after power on, then it changes to "H"
34 PLL-CE O
Chip enable signal output to the FM/AM PLL (IC3) "H" active
35 BEEP O Beep sound drive signal output to the power amp (IC500)
36 POWER-ON O Main system power supply on/off control signal output terminal "H": power on
37 ILL-IN
I Not used (fixed at "H")
38 ACC-IN I Accessory detect signal input terminal "L": accessory on
39 O
NCO Not used (open)
Telephone muting signal input terminal At input of "H", the signal is attenuated by –20 dB
40 TEL-MUTE I
Used for the XR-CA320/CA320X only
41 NCI
I Not used (fixed at "H")
42 UNI-SO
O Serial data output to the SONY bus interface (IC800)
43 UNI-SI
I Serial data input from the SONY bus interface (IC800)
Description
"L": single chip
"L": RAM reset
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Pin No. Pin Name I/O
44 UNI-CKO O Serial data transfer clock signal output to the SONY bus interface (IC800)
45 SDA I/O Not used (open)
46 NCO
O Not used (open)
47 SCL O Not used (open)
48 VOL-SO
O Serial data output to the electrical volume (IC400)
49 VOL-CE O Chip enable signal output to the electrical volume (IC400) "H" active
50 VOL-CKO O Serial data transfer clock signal output to the electrical volume (IC400)
Standby on/off control signal output to the power amp (IC500)
51 AMP-ON O
"L": standby mode, "H": amp on
52 AMP-MUTE O Muting on/off control signal output to the power amp (IC500) "L": muting on
53 MUTE
O Audio line muting on/off control signal output terminal "H": muting on
54 TU-MUTE O Not used (open)
FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU100)
55 PORT2 (ST) I
"L": stereo display lighting
Station detector detect input from the FM/AM tuner unit (TU100)
56 SD IN
I
Stop level for SEEK is determined
57 LO/DX O
Local/DX control signal output
58 TU-ON O Tuner system power supply on/off control signal output terminal "H": tuner power on
FM system power supply on/off control signal output terminal
59 FM-ON O
"L": AM power on, "H": FM power on
AM system power supply on/off control signal output terminal
60
AM-ON O
"L": FM power on, "H": AM power on Not used (open)
61 to 68 NCO O Not used (open)
69 NOISE-ON O
Not used (open)
70 to 82 NCO O Not used (open)
83 ILL-COLOR
I Illumination color select input terminal "L": amber illumination "H": green illumination
84 DEST-SEL0 I Destination setting terminal (fixed at "H")
85 DEST-SEL1 I Destination setting terminal XR-CA300: fixed at "L", XR-CA320/CA320X: fixed at "H"
Destination setting terminal XR-CA300: fixed at "L", XR-CA320/CA320X: input for the
86 DEST-SEL2 I
FREQUENCY SELECT switch (S60)
87, 88 NCO O Not used (open)
Front panel block remove/attach detection signal input terminal
89 NOSE-SW I
"L": front panel is attached
Internal flash memory data write mode detection signal input terminal "L": data write mode,
90 FLASH-W I
Normally: fixed at "H"
91 NCO O
Not used (open)
Power on/off control signal output of the illumination LED and LCD back light (PL901, 902)
92 ILL-ON O
"H": power on
93 BUS-ON
O Bus on/off control signal output to the SONY bus interface (IC800) "L": bus on
94 SYS-RST O Reset signal output to the SONY bus interface (IC800) "L": reset
95 DAVSS —
Ground terminal (for D/A converter)
96 TAPE-ON O Capstan/reel motor (M901) drive signal output terminal "H": motor on
97 N/R I Tape direction switch (S903) input terminal "L": reverse direction "H": forward direction
98 FF/REW I
FF/REW detection switch (S902) input terminal "L": FF/REW mode
99 TAPE-IN I Tape in detection switch (S903) input terminal "L": tape in
100 DAVDD — Power supply terminal (+5V) (for D/A converter)
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Description
SD is present at input of "H"
"L": DX Not used (open)