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PCA9557 查看數據表(PDF) - Philips Electronics
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产品描述 (功能)
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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
Product data
PCA9557
SIMPLIFIED SCHEMATIC OF I/O1 TO I/O7
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
CONFIGURATION
PULSE
WRITE PULSE
CONFIGURATION
REGISTER
DQ
FF
C
K
Q
DQ
FF
C
K
Q
OUTPUT
PORT
REGISTER
READ PULSE
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 5. Simplified schematic of I/O1 to I/O7
OUTPUT PORT
REGISTER DATA
V
DD
ESD PROTECTION DIODE
I/O1 TO I/O7
ESD PROTECTION DIODE
V
SS
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
SW00796
2001 Dec 12
5
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