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PCA9535 Datasheet(PDF) 8 Page - NXP Semiconductors

Part No. PCA9535
Description  16-bit I2C and SMBus, low power I/O port with interrupt
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9535 Datasheet(HTML) 8 Page - NXP Semiconductors

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1
0
A2
A1 A0
0
0
0
0
A2
A1
A0
0
1
S0
A
A
A
COMMAND BYTE
acknowledge
from slave
R/W
acknowledge
from slave
A
P
NA
acknowledge
from slave
acknowledge
from master
S
DATA
DATA
R/W
first byte
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
last byte
SU01463
no acknowledge
from master
1
slave address
data from upper
or lower byte of
register
data from lower
or upper byte
of register
slave address
MSB
LSB
MSB
LSB
NOTE: Transfer can be stopped at any time by a STOP condition.
Figure 8.
READ from register
1
23456789
S
0
100
A2
A1
A0
1
A
7
654
321
0
A
I0.x
765
4
3
2
1
0
A
I1.x
7
654
321
0
A
I0.x
7
6
54
32
1
0
1
I1.x
P
R/W
ACKNOWLEDGE
FROM SLAVE
SCL
SDA
ACKNOWLEDGE
FROM MASTER
ACKNOWLEDGE
FROM MASTER
ACKNOWLEDGE
FROM MASTER
NON ACKNOWLEDGE
FROM MASTER
READ FROM PORT 0
DATA INTO PORT 0
READ FROM PORT 1
DATA INTO PORT 1
INT
tIR
tIV
SU01464
NOTES: Transfer of data can be stopped at any moment by a STOP condition. When this occurs, data present at the latest acknowledge phase is valid (output mode).
It is assumed that the command byte has previously been set to 00 (read input port port register).
Figure 9.
READ input port register — scenario 1


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