PCA9556 データシートの表示（PDF） - Philips Electronics

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PCA9556

Octal SMBus and I2C registered interface

Philips Electronics 

Philips Semiconductors

Octal SMBus and I2C registered interface

SIMPLIFIED SCHEMATIC OF I/O0

DATA FROM

SHIFT REGISTER

DATA FROM

SHIFT REGISTER

WRITE

CONFIGURATION

PULSE

WRITE PULSE

CONFIGURATION

REGISTER

DQ

FF

CK Q

READ PULSE

DQ

FF

CK Q

OUTPUT

PORT

REGISTER

INPUT PORT

REGISTER

DQ

FF

CK Q

DATA FROM

SHIFT REGISTER

WRITE POLARITY

PULSE

DQ

FF

CK 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

PCA9556

OUTPUT PORT

REGISTER DATA

I/O0

ESD PROTECTION DIODE

VSS

INPUT PORT

REGISTER DATA

POLARITY

REGISTER DATA

SW00795

2002 Mar 28

5

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