9538 データシートの表示（PDF） - NXP Semiconductors.
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9538 Datasheet PDF : 28 Pages
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NXP Semiconductors
PCA9538
8-bit I2C-bus and SMBus low power I/O port with interrupt and reset
slave address
SDA S 1 1 1 0 0 A1 A0 0 A
COMMAND BYTE
A (cont.)
START condition
R/W
acknowledge
from slave
slave address
(cont.) S 1 1 1 0 0 A1 A0 1 A
acknowledge
from slave
data from register
DATA (first byte)
A
data from register
DATA (last byte)
NA P
(repeated)
START condition
R/W
acknowledge
from slave
Fig 9. Read from register
acknowledge
from master
no acknowledge STOP
from master condition
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
002aae710
SCL 1 2 3 4 5 6 7 8 9
slave address
data from port
data from port
SDA S 1 1 1 0 0 A1 A0 1 A
DATA 1
A
DATA 4
START condition
read from
port
data into
port
DATA 1
INT
tv(INT)
R/W acknowledge
from slave
acknowledge
from master
th(D)
DATA 2
trst(INT)
DATA 3
tsu(D)
DATA 4
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.
Expanded diagram is shown in Figure 17.
Fig 10. Read input port register
no acknowledge
from master
NA P
STOP
condition
002aae711
PCA9538_5
Product data sheet
Rev. 05 — 28 May 2009
© NXP B.V. 2009. All rights reserved.
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