pca9575 NXP Semiconductors, pca9575 Datasheet - Page 23

• Manufacturer Part Number: pca9575
• Description: 16-bit I2c-bus And Smbus, Level Translating, Low Voltage Gpio With Reset And Interrupt
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9575_1
Product data sheet
Fig 15. Read from register
Fig 16. Read Input port register
data into
(1) Slave address shown in this example is for the 24-pin version.
(1) Slave address shown in this example is for the 24-pin version.
SDA
(cont.)
port
INT
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.
S
START condition
SDA
S
(repeated)
START condition
port
0
SCL
0
1
slave address
S
START condition
t
1
v(INT)
slave address
0
1
0
0
0
2
1
slave address
0
0
3
0
(1)
0
acknowledge
0
4
0
(1)
from slave
0
acknowledge
0
5
0
R/W
from slave
0
(1)
0
R/W
6
0
1
A
7
t
0
h(D)
R/W
A
8
1
9
A
acknowledge
from slave
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
Rev. 01 — 2 October 2008
command byte
16-bit I
data from register
DATA (first byte)
t
rst(INT)
DATA 2
data from port
2
acknowledge
C-bus and SMBus, level translating, low voltage GPIO
DATA 1
DATA 3
from slave
acknowledge
from master
t
su(D)
A
A
(cont.)
A
acknowledge
from master
data from register
DATA (last byte)
data from port
DATA 4
DATA 4
no acknowledge
from master
PCA9575
© NXP B.V. 2008. All rights reserved.
NA
1
no acknowledge
from master
002aad571
002aad572
P
STOP
condition
P
STOP
condition
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