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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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