PCA9535 Philips Semiconductors, PCA9535 Datasheet - Page 8

• Manufacturer Part Number: PCA9535
• Description: 16-bit I2C and SMBus/ low power I/O port with interrupt
• Manufacturer: Philips Semiconductors

NOTE: Transfer can be stopped at any time by a STOP condition.
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).
READ FROM PORT 0
DATA INTO PORT 0
READ FROM PORT 1
DATA INTO PORT 1
SDA
SCL
INT
S
1
S
0
2
0
1
3
1
0
t
IV
4
0
0
slave address
5
A2
0
6
A1
A2 A1 A0
7
A0
R/W ACKNOWLEDGE
8
1
acknowledge
from slave
9
A
FROM SLAVE
R/W
0
7
A
6
t
IR
5
4
I0.x
COMMAND BYTE
3
2
Figure 9. READ input port register — scenario 1
1
0
Figure 8. READ from register
A
ACKNOWLEDGE
FROM MASTER
acknowledge
from slave
7
6
A
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
5
S
4
I1.x
0
3
0
2
slave address
1
1
0
0
A2 A1 A0
A
ACKNOWLEDGE
FROM MASTER
7
6
acknowledge
from slave
R/W
1
5
MSB
4
A
I0.x
MSB
3
data from upper
or lower byte of
2
register
last byte
1
data from lower
DATA
or upper byte
of register
0
first byte
DATA
ACKNOWLEDGE
FROM MASTER
A
7
LSB
no acknowledge
from master
6
acknowledge
from master
NA
5
LSB
SU01463
4
P
I1.x
A
3
NON ACKNOWLEDGE
2
1
FROM MASTER
0
SU01464
1
P