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PCA9557 Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. PCA9557
Description  8-bit I2C and SMBus I/0 port with reset
Download  16 Pages
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9557 Datasheet(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product data
PCA9557
8-bit I2C and SMBus I/0 port with reset
2001 Dec 12
4
SIMPLIFIED SCHEMATIC OF I/O0
WRITE PULSE
DATA FROM
SHIFT REGISTER
I/O0
VSS
WRITE
CONFIGURATION
PULSE
D
CK
FF
Q
D
CK
Q
FF
D
CK
Q
FF
D
CK
Q
FF
INPUT PORT
REGISTER
POLARITY
INVERSION
REGISTER
OUTPUT
PORT
REGISTER
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE POLARITY
PULSE
CONFIGURATION
REGISTER
OUTPUT PORT
REGISTER DATA
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
SW00795
READ PULSE
ESD PROTECTION DIODE
Q
Q
Q
Q
NOTE:
On power–up or reset, all registers return to default values.
Figure 4. Simplified schematic of I/O0


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