PCA9557 查看數據表（PDF） - Philips Electronics

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产品描述 (功能)

生产厂家

PCA9557

8-bit I2C and SMBus I/0 port with reset

Philips Electronics 

Philips Semiconductors

8-bit I2C 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

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

PCA9557

OUTPUT PORT

REGISTER DATA

I/O0

ESD PROTECTION DIODE

VSS

INPUT PORT

REGISTER DATA

POLARITY

REGISTER DATA

SW00795

2001 Dec 12

4

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