PCA9554U,029 NXP Semiconductors, PCA9554U,029 Datasheet - Page 11

• Manufacturer Part Number: PCA9554U,029
• Description: I2C Interface IC PCA9554U/UNCASED/PUT
• Manufacturer: NXP Semiconductors

Specifications of PCA9554U,029

• Factory Pack Quantity: 7000

NXP Semiconductors
PCA9554_9554A
Product data sheet
Fig 13. Read from register
Fig 14. Read Input Port register
SDA
(cont.)
data into
read from
This figure assumes the command byte has previously been programmed with 00h.
Transfer of data can be stopped at any moment by a STOP condition.
port
INT
S
START condition
SDA
SCL
port
S
(repeated)
START condition
0
0
S
START condition
1
slave address
1
1
t
0
0
v(INT_N)
slave address
0
2
0 A2 A1 A0 0
1
slave address
0 A2 A1 A0 1
3
0
acknowledge
4
0 A2 A1 A0 1
from slave
acknowledge
5
R/W
from slave
6
acknowledge
R/W
from slave
7
A
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R/W
t
h(D)
A
8
9
A
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
command byte
Rev. 9 — 19 March 2013
DATA 2
data from register
DATA (first byte)
t
rst(INT_N)
data from port
DATA 1
acknowledge
DATA 3
from slave
acknowledge
from master
acknowledge
from master
8-bit I
A
t
A
su(D)
(cont.)
PCA9554; PCA9554A
2
C-bus and SMBus I/O port with interrupt
A
DATA 4
data from register
DATA (last byte)
data from port
DATA 4
no acknowledge
no acknowledge
from master
from master
© NXP B.V. 2013. All rights reserved.
NA
NA
002aac475
002aac474
P
STOP
condition
P
STOP
condition
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