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Sony BKPF-L752 Maintenance Manual page 21

Audio d/a converter board
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PCF8574AT (PHILIPS)
C-MOS REMOTE 8-BIT I/O EXPANDER
—TOP VIEW—
1
A0
A0
1
V
16
2
IN
DD
A1
3
A2
A1
2
15
SDA
IN
14
SCL
A2
3
14
SCL
IN
P0
4
13
INT
I/O
P1
5
12
P7
I/O
I/O
P2
6
11
P6
I/O
I/O
P3
7
10
P5
I/O
I/O
8
GND
9
P4
I/O
INPUT
A0 - A2
; ADDRESS INPUTS
SCL
; SYSTEM CLOCK LINE
OUTPUT
INT
; INTERRUPT OUTPUT
SDA
; SERIAL DATA LINE
INPUT/OUTPUT
P0 - P7
; 8-BIT QUASI-BIDIRECTIONAL I/O PORT
INTERRUPT
13
INT
LOGIC
PCF8574
1
PCF8574A
A0
2
A1
3
A2
14
SCL
INPUT
I
2
C BUS
15
SDA
FILTER
CONTROL
SHIFT
REGISTER
write pulse
read pulse
16
V
DD
POWER-ON
8
RESET
V
SS
SSM-2142P (PMI)
BALANCED LINE DRIVER
—TOP VIEW—
_FORCE
1
8
+FORCE
_SENSE
2
7
+SENSE
3
GND
V
6
CC
V
4
V
5
IN
EE
BKPF-L752
13
INT
4
P0
5
P1
6
P2
7
P3
9
P4
10
P5
11
P6
12
P7
15
SDA
LP FILTER
4
P0
5
P1
6
P2
7
I/O
P3
9
8-BIT
PORTS
P4
10
P5
11
P6
12
P7
TL7705ACPS (TI)
TL7705ACPSR
POWER VOLTAGE SUPERVISOR
—TOP VIEW—
7
V
1
V
8
REF OUT
CC
2
RESIN
SENSE
IN
2
7
IN
3
C
OUT (1)
T IN
3
6
)
4
GND
5
OUT (2)
REF
+2.5 V
V
CC
7
2
3
* OPEN COLLECTOR
1
SENSE
V
REF
6
RESIN
OUT (1)
5
OUT (2)
C
T
1
*
5
*
6
4-5
IC

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