5-7. Ic Pin Function Description - Sony XR-CA300 Service Manual

5-7. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC1 MN101C49GTH (SYSTEM CONTROLLER)
Pin No. Pin Name
1 VREF –
2
VSM
3 to 6
NCI
7 NOISE-DET
8 MPTH
9
NCI
10 VREF +
11 VDD
12 OSC2
13 OSC1
14
VSS
15 XI
16 XO
17 MMOD
18 LCD-SO (TX)
19 LCD-SI (RX)
20 LCD-CKO
21 TU-SDA
22 TU-SI
23 TU-SCL
24 LCD-RES
25 LCD-CE
26 KEYACK
27 DAVN-RDS
28 B/U-IN
29
NCI
30 RAM BU
31 TEST-IN
32
NCI
33 RESET
34 TU-ENABLE
35 BEEP
36
POWER-ON
37 ILL-IN
38 ACC-IN
39 NCO
40
TEL-MUTE
41 NCI
42 UNI-SO
43 UNI-SI
I/O
—
Reference voltage (0V) terminal (for A/D converter)
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
I
(A/D input)
I
Not used (fixed at "L")
I Not used (fixed at "L")
I Not used (fixed at "L")
I
Not used (fixed at "L")
—
Reference voltage (+5V) terminal (for A/D converter)
— Power supply terminal (+5V)
O Main system clock output terminal (18.432MHz)
I Main system clock input terminal (18.432MHz)
—
Ground terminal
I Sub system clock input terminal (32.768kHz)
O
Sub system clock output terminal (32.768kHz)
I
Setting terminal for the single chip mode
O
LCD serial data output to the liquid crystal display driver (IC900)
I LCD serial data input from the liquid crystal display driver (IC900)
O
LCD serial transfer clock signal output to the liquid crystal display driver (IC900)
O
Serial data output to the FM/AM tuner unit (TU100)
I
Serial data input from the FM/AM tuner unit (TU100)
O Serial data transfer clock signal output to the FM/AM tuner unit (TU100)
O
LCD reset signal output to the liquid crystal display driver (IC900) "L": reset
O
Chip enable signal output to the liquid crystal display driver (IC900) "H" active
I Key acknowledge signal detect input from the liquid crystal display driver (IC900)
I Not used (fixed at "L")
Battery detect signal input from the SONY bus interface (IC800) and battery detect circuit
I
"L" is input at low voltage
I
Not used (fixed at "L")
Internal RAM reset detection signal input terminal
I
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset
I Setting terminal for the test mode "L": test mode, Normally: fixed at "H"
I
Not used (fixed at "L")
System reset signal input from the reset signal generator (IC2) and reset switch (S1)
I
"L": reset "L" is input for several 100 msec after power on, then it changes to "H"
O
Chip enable signal output to the FM/AM tuner unit (TU100) "H" active
O Beep sound drive signal output to the power amp (IC500)
O Main system power supply on/off control signal output terminal "H": power on
I Not used (fixed at "H")
I Accessory detect signal input terminal "L": accessory on
O Not used (open)
Telephone muting signal input terminal At input of "H", the signal is attenuated by –20 dB
I
Used for the XR-CA320/CA320X only
I Not used (fixed at "H")
O Serial data output to the SONY bus interface (IC800)
I Serial data input from the SONY bus interface (IC800)
XR-CA300/CA320/CA320X
Description
"L": single chip
"L": RAM reset
25