PCA9557PW datasheet(3/26 Pages) NXP

Part #	PCA9557PW

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

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Manufacturer	NXP [NXP Semiconductors]

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3 / 26 page

PCA9557

Product data sheet

Rev. 06 — 11 June 2008

3 of 26

NXP Semiconductors

PCA9557

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

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

Fig 2.

Simpliﬁed schematic of IO0

IO0

output port

register data

configuration

register

DQ

CK

Q

data from

shift register

write configuration

pulse

output port

register

DQ

CK

write pulse

polarity inversion

register

DQ

CK

data from

shift register

write polarity

pulse

input port

register

DQ

CK

read pulse

input port

register data

polarity inversion

register data

002aad277

FF

data from

shift register

FF

VSS

ESD protection

diode

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Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCA9557PW	127Kb / 16P	8-bit I2C and SMBus I/0 port with reset 2001 Dec 12
Texas Instruments	PCA9557PW	1,015Kb / 34P	[Old version datasheet] REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH RESET AND CONFIGURATION REGISTERS
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