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9557

8-bit I2C-bus and SMBus I/O port with reset

NXP Semiconductors. 

NXP Semiconductors

PCA9557

8-bit I2C-bus and SMBus I/O port with reset

data from

shift register

data from

shift register

write configuration

pulse

configuration

register

D

Q

FF

CK Q

write pulse

DQ

FF

CK

output port

register

read pulse

data from

shift register

write polarity

pulse

input port

register

D

Q

FF

CK

polarity inversion

register

D

Q

FF

CK

On power-up or reset, all registers return to default values.

Fig 3. Simplified schematic of IO1 to IO7

output port

register data

VDD

ESD protection

diode

IO1 to IO7

ESD protection

diode

VSS

input port

register data

polarity inversion

register data

002aad278

PCA9557

Product data sheet

Rev. 06 — 11 June 2008

© NXP B.V. 2008. All rights reserved.

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