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PCA9502 Datasheet(PDF) 10 Page - NXP Semiconductors

Part # PCA9502
Description  8-bit I/O expander with I2C-bus/SPI interface
PDF  25 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9502 Datasheet(HTML) 10 Page - NXP Semiconductors

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PCA9502_3
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 03 — 13 October 2006
10 of 25
NXP Semiconductors
PCA9502
8-bit I/O expander with I2C-bus/SPI interface
Fig 9.
I2C-bus data formats
002aab458
DATA
SLAVE ADDRESS
master write:
S
W
A
DATA
A
A
P
data transferred
(n bytes + acknowledge)
START condition
STOP condition
acknowledge
acknowledge
acknowledge
write
DATA
SLAVE ADDRESS
master read:
S
R
A
DATA
A
NA
P
data transferred
(n bytes + acknowledge)
START condition
STOP condition
acknowledge
acknowledge
not
acknowledge
read
DATA
SLAVE ADDRESS
combined
formats:
S
R/W
A
DATA
A
A
P
data transferred
(n bytes + acknowledge)
START condition
STOP condition
acknowledge
acknowledge
acknowledge
read or
write
SLAVE ADDRESS
Sr
R/W
A
repeated
START condition
acknowledge
read or
write
direction of transfer
may change at this point
data transferred
(n bytes + acknowledge)



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