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I/O Expander (IC899)
Pin Name
1
SO
2
SCL
3
SDA
4
D0
5
D1
6
D2
7
D3
8
GND
9
D4
10
D5
11
D6
12
D7
13
VDD
14
CS2
15
CS1
16
CS0
Mode Switching Table
Mode
SWITCH 1
TV
AV1
(Composite)
AV1
(S-Input: Y)
AV2 (Composite)
AV2 (Y)
CONTROL PORT FUNCTIONS (Cont.)
Function
SERIAL OUTPUT
BUS SCL
BUS SDA
P-FAIL 1
P-FAIL 2
P-FAIL 3
P-FAIL 4
GND
AV SWITCH 1
AV SWITCH 2
AV SWITCH 3
AV SWITCH 4
VDD
CHIP SELECT3
CHIP SELECT2
CHIP SELECT1
SWITCH 2
Low
High
Low
Low
High
Low
Low
Low
Low
Low
I/O Description
–
I/O
IIC Bus port, SCL : Clock
I/O
IIC Bus port, SDA : Data
IN
Power Failure for Digital Power Source, Failure : Low
IN
Power Failure for Panel, Failure : Low
IN
Power Failure for Analog Power Source, Failure : Low
IN
Power Failure for Audio Power Source, Failure : Low
I
OUT
Connect to IC1001 2pin
OUT
Connect to IC1001 4pin
OUT
Connect to IC1002 2pin
OUT
Connect to IC1002 4pin
–
5V
I
Fixed to Low
I
Fixed to Low
I
Fixed to Low
SWITCH 3
Low
Low
Low
Low
High
— 50 —
SWITCH 4
High
High
High
Low
Low
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