-45-
●
Output Expander (IC1803, TC74LCX574FT) Port Functions
Control Port Functions
1
OE
IO_ENB
I
2
D8
D8
I
3
D9
D9
I
4
D10
D10
I
5
D11
D11
I
6
D12
D12
I
7
D13
D13
I
8
D14
D14
I
9
D15
D15
I
10
GND
GND
-
11
CK
ADD1_CS
Output Port Chip Select
Enable = L
I
12
Q7
--
O
13
Q6
TURBO_ST
Strobe for Turbo (IC9401)
O
14
Q5
SH_B_ST
Strobe for B sample & hold (IC501)
O
15
Q4
SH_G_ST
Strobe for G sample & hold (IC531)
O
16
Q3
SH_R_ST
Strobe for R sample & hold (IC561)
O
17
Q2
IRM_RS
Reset for IC401
O
18
Q1
MCLK_SW
Switch for MCLK
O
19
Q0
--
O
20
Vdd
Power 3.3V
-
●
Output Expander (IC1802, TC74LCX574FT) Port Functions
1
OE
IO_ENB
I
2
D0
D0
I
3
D1
D1
I
4
D2
D2
I
5
D3
D3
I
6
D4
D4
I
7
D5
D5
I
8
D6
D6
I
9
D7
D7
I
10
GND
GND
-
11
CK
ADD1_CS
Output Port Chip Select
Enable = L
I
12
Q7
SC_SW
SCART input switch
SCART = H
O
13
Q6
READY_LED
Ready LED
Ready = H
O
14
Q5
LAMP_LED
Lamp Replace LED
Replace = H
O
15
Q4
TEMP_LED
Warning Temperature LED
Warning = H
O
16
Q3
PWR_LED
AC Power LED
ON = H
O
17
Q2
KO3
KEY Scan Output
O
18
Q1
KO2
KEY Scan Output
O
19
Q0
KO1
KEY Scan Output
O
20
Vdd
Power 3.3V
-
Pin No.
Name
Function
I/O
●
Output Expander (IC1801, TC74LCX574FT) Port Functions
1
OE
IO_ENB
I
2
D0
D0
I
3
D1
D1
I
4
D2
D2
I
5
D3
D3
I
6
D4
D4
I
7
D5
D5
I
8
D6
D6
I
9
D7
D7
I
10
GND
GND
-
11
CK
ADD1_CS
Output Port Chip Select
Enable = L
I
12
Q7
--
O
13
Q6
--
O
14
Q5
--
O
15
Q4
LAMPDC_ON
Drives Lamp Ballast Unit
Power-on=H
O
16
Q3
DC_ON
Drives 15.5V Power Supply
Power-on=H
O
17
Q2
ON_3.3V
Drives 3.3V Power Supply
Power-on=H
O
18
Q1
FAN_SW2
Not used
O
19
Q0
FAN_SW1
Drives FAN_B, FAN_C Power Supply
Power-on=H
O
20
Vdd
Power 3.3V
-
Pin No.
Name
Function
I/O
Pin No.
Name
Function
I/O
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