pca9575 NXP Semiconductors, pca9575 Datasheet - Page 22

• 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
9. Bus transactions
PCA9575_1
Product data sheet
Fig 13. Write to Output port register
Fig 14. Write to Polarity inversion, Bus-hold enable, Pull-up/pull-down select, Configuration, Interrupt mask and
(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
SDA
write to port
data out from port
data to register
Interrupt status registers
SCL
SCL
S
START condition
S
START condition
1
1
0
0
2
2
1
1
slave address
slave address
3
3
0
0
Data is transmitted to the PCA9575 registers using ‘Write Byte’ transfers (see
and
Data is read from the PCA9575 registers using ‘Read Byte’ transfers (see
Figure
4
4
0
0
Figure
5
5
0
0
(1)
(1)
16).
6
6
0
0
7
7
0
0
14).
R/W
R/W
8
8
0
0
9
9
A
A
acknowledge
from slave
acknowledge
from slave
0
0
0
0
Rev. 01 — 2 October 2008
16-bit I
command byte
command byte
0
0
0
0
2
0
X
C-bus and SMBus, level translating, low voltage GPIO
0
X
0
X
1
X
A
acknowledge
from slave
A
acknowledge
from slave
data to register
data to port
DATA 1
DATA
t
v(Q)
A
acknowledge
from slave
A
acknowledge
from slave
PCA9575
© NXP B.V. 2008. All rights reserved.
DATA 1 VALID
STOP
condition
P
STOP
condition
P
002aad569
Figure 15
002aad570
Figure 13
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and