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PCA9557 데이터 시트보기 (PDF) - Philips Electronics
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PCA9557
8-bit I2C and SMBus I/0 port with reset
Philips Electronics
PCA9557 Datasheet PDF : 16 Pages
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Philips Semiconductors
8-bit I
2
C and SMBus I/0 port with reset
SIMPLIFIED SCHEMATIC OF I/O0
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
CONFIGURATION
PULSE
WRITE PULSE
CONFIGURATION
REGISTER
DQ
FF
C
K
Q
READ PULSE
DQ
FF
C
K
Q
OUTPUT
PORT
REGISTER
INPUT PORT
REGISTER
DQ
FF
C
K
Q
DATA FROM
SHIFT REGISTER
WRITE POLARITY
PULSE
DQ
FF
C
K
Q
POLARITY
INVERSION
REGISTER
NOTE:
On power–up or reset, all registers return to default values.
Figure 4. Simplified schematic of I/O0
Product data
PCA9557
OUTPUT PORT
REGISTER DATA
I/O0
ESD PROTECTION DIODE
V
SS
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
SW00795
2001 Dec 12
4
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