PCA9553 Ver la hoja de datos (PDF) - NXP Semiconductors.
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PCA9553 Datasheet PDF : 26 Pages
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NXP Semiconductors
PCA9553
4-bit I2C-bus LED driver with programmable blink rates
data output
by transmitter
data output
by receiver
SCL from master
1
2
S
START
condition
Fig 11. Acknowledgement on the I2C-bus
8.4 Bus transactions
not acknowledge
acknowledge
8
9
clock pulse for
acknowledgement
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SCL 1 2 3 4 5 6 7 8 9
slave address
command byte
data to register
SDA S 1 1 0 0 0 1 0 0 A 0 0 0 AI 0 B2 B1 B0 A
DATA 1
A
START condition
write to register
data out from port
Fig 12. Write to register
R/W acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
tv(Q)
DATA 1 VALID
002aad746
slave address
command byte
SDA S 1 1 0 0 0 1 0 0 A 0 0 0 AI 0 B2 B1 B0 A (cont.)
START condition
R/W
acknowledge
from slave
slave address
(cont.) S 1 1 0 0 0 1 0 1 A
(repeated)
START condition
R/W
acknowledge
from slave
Fig 13. Read from register
acknowledge
from slave
data from register
data from register
DATA (first byte)
A
DATA (last byte)
NA P
Auto-Increment
register address
if AI = 1
acknowledge
from master
no acknowledge STOP
from master condition
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
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PCA9553_6
Product data sheet
Rev. 06 — 29 December 2008
© NXP B.V. 2008. All rights reserved.
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