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PCA9557 Datasheet(PDF) 3 Page - NXP Semiconductors

Part # PCA9557
Description  8-bit I2C-bus and SMBus I/O port with reset
PDF  26 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9557 Datasheet(HTML) 3 Page - NXP Semiconductors

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PCA9557
© NXP B.V. 2008. All rights reserved.
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
FF
FF
VSS
ESD protection
diode



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