Ic Pin Function Description - Sony XR-C7220 Service Manual

6-9. IC PIN FUNCTION DESCRIPTION

•
MAIN BOARD IC501 (SYSTEM CONTROLLER)
MB90574PFV-G-180-BND (XR-C7220)
Pin No. Pin Name
1 SEEKOUT
2, 3 NCO
4 ST-MONO
5 TUNMUTE
6
FM-ON
7
TU-ON
8 VCC
9
NCO
10 BUS-ON
11 SYSRST
12 DOORSW
13 LCD SO
14 LCD CKO
15
BEEP
16 LCD CE
17 UNISI
18 UNISO
19 UNICKO
20 SD-IN
21 to 23 NCO
24
SIRCS
25 PLLSI
26 PLLSO
27 PLLCKO
28 PLLCE
29
ILL-ON
30 to 32
NCO
33
VSS
34 C
35 AD-ON
36 RE-IN0
37 RE-IN1
38 DVCC
39 DVSS
MB90574PFV-G-181-BND (XR-C7300/C7300W)
I/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
O
FM mode: Used for SD speed up at SEEK, BTM, or AF
"L" is output at tuner off
O Not used (open)
FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU1), or forced
I/O
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
O
Muting on/off control signal output of the FM and AM tuner signal "H": muting on
FM system power supply on/off control signal output to the BA3918 (IC671)
O
"L": AM power on, "H": FM power on
Tuner system power supply on/off control signal output to the BA3918 (IC671)
O
"H": tuner power on
—
Power supply terminal (+5V)
O
Not used (open)
O Bus on/off control signal output to the SONY bus interface (IC701) "L": bus on
O
Reset signal output to the SONY bus interface (IC701) "L": reset
I Front panel open/close detection signal input "L" is input when the front panel is closed
O Serial data output to the liquid crystal display driver (IC901)
O Serial data transfer clock signal output to the liquid crystal display driver (IC901)
O Beep sound drive signal output terminal
O Chip enable signal output to the liquid crystal display driver (IC901) "H" active
I Serial data input from the SONY bus interface (IC701)
O Serial data output to the SONY bus interface (IC701)
O Serial data transfer clock signal output to the SONY bus interface (IC701)
Station detector detect input from the FM/AM tuner unit (TU1)
I
Stop level for SEEK, BTM, etc. is determined SD is present at input of "H"
O Not used (open)
I
Sircs remote control signal input from the remote control receiver (IC951)
I
PLL serial data input from the FM/AM PLL (IC1)
O
PLL serial data output to the FM/AM PLL (IC1)
O
PLL serial data transfer clock signal output to the FM/AM PLL (IC1)
O
PLL chip enable signal output to the FM/AM PLL (IC1) "H" active
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)
O
Power select switch (S501) on: "H" output at the accessory on
Power select switch (S501) off: "H" output at the power on
O
Not used (open)
—
Ground terminal
—
Connected to coupling capacitor for the power supply
A/D converter power control signal output terminal
When the KEYACK (pin &§) that controls reference voltage power for key A/D conversion input
O
is active, "L" is output from this terminal to enable the input
I
Dial pulse input of the rotary encoder (RE900)
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)
I
—
Power supply terminal (+5V) (for D/A converter)
— Ground terminal (for D/A converter)
Function
– 35 –