– 42 –
6-11.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501 MB90574PFV-G-196-BND (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
SEEKOUT
O
Seek control signal output to the FM/AM tuner unit (TU1)
AM mode: Used for IF count output/SD output request/AGC cut at SEEK or BTM
FM mode: Used for SD speed up at SEEK, BTM, or AF
“L” is output at tuner off
2
AF-SEEK
O
PLL low-pass filter time constant selection signal output at AF SEEK
“H” is output when AF SEEK Not used (open)
3
NCO
O
Not used (open)
4
ST-MONO
I/O
FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU1), or forced
monaural control signal output to the FM/AM tuner unit (TU1)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode
5
TUNMUTE
O
Muting on/off control signal output of the FM and AM tuner signal “H”: muting on
6
FM-ON
O
FM system power supply on/off control signal output to the BA3918 (IC671)
“L”: AM power on, “H”: FM power on
7
TU-ON
O
Tuner system power supply on/off control signal output to the BA3918 (IC671)
“H”: tuner power on
8
VCC
—
Power supply terminal (+5V)
9
NCO
O
Not used (open)
10
BUS-ON
O
Bus on/off control signal output to the SONY bus interface (IC701) “L”: bus on
11
SYSRST
O
Reset signal output to the SONY bus interface (IC701) “L”: reset
12
DOORSW
I
Front panel open/close detection signal input “L” is input when the front panel is closed
13
LCD SO
O
Serial data output to the liquid crystal display driver (IC901)
14
LCD CKO
O
Serial data transfer clock signal output to the liquid crystal display driver (IC901)
15
BEEP
O
Beep sound drive signal output terminal
16
LCD CE
O
Chip enable signal output to the liquid crystal display driver (IC901) “H” active
17
UNISI
I
Serial data input from the SONY bus interface (IC701)
18
UNISO
O
Serial data output to the SONY bus interface (IC701)
19
UNICKO
O
Serial data transfer clock signal output to the SONY bus interface (IC701)
20
SD-IN
I
Station detector detect input from the FM/AM tuner unit (TU1)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
21 to 23
NCO
O
Not used (open)
24
SIRCS
I
Sircs remote control signal input terminal Not used (fixed at “H”)
25
PLLSI
I
PLL serial data input from the FM/AM PLL (IC1)
26
PLLSO
O
PLL serial data output to the FM/AM PLL (IC1)
27
PLLCKO
O
PLL serial data transfer clock signal output to the FM/AM PLL (IC1)
28
PLLCE
O
PLL chip enable signal output to the FM/AM PLL (IC1) “H” active
29
ILL-ON
O
30, 31
NCO
O
Not used (open)
32
NOISE ON
O
Discharge control signal output for the noise detection circuit “H”: discharge
33
VSS
—
Ground terminal
34
C
—
Connected to coupling capacitor for the power supply
35
AD-ON
O
A/D converter power control signal output terminal
When the KEYACK (pin
&§
) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input
36
RE-IN0
I
37
RE-IN1
I
Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC901) “H”: power on Depends on initial setting of power select switch (S501)
Power select switch (S501) on: “H” output at the accessory on
Power select switch (S501) off: “H” output at the power on
Dial pulse input of the rotary encoder (RE900)
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)
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