Sony BKPF-L752, Maintenance Manual

Page: 21 / 34

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