PCA6416A NXP [NXP Semiconductors], PCA6416A Datasheet - Page 14

• Manufacturer Part Number: PCA6416A
• Description: Low-voltage translating 16-bit I2C-bus/SMBus I/O expander
• Manufacturer: NXP [NXP Semiconductors]

Fig 12. Read input port register, scenario 1
data into port 0
data into port 1
SDA
read from port 0
read from port 1
INT
SCL
S
START condition
Remark: 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 register).
This figure eliminates the command byte transfer and a restart between the initial slave address call and actual data transfer from P port (see
1
0
2
1
slave address
t
3
v(INT)
0
4
0
5
0
6
acknowledge
0
from slave
AD
DR
7
R/W
8
1
9
A
7
t
rst(INT)
6
5
4
I0.x
3
acknowledge
2
from master
1
0
A
7
6
5
4
I1.x
3
acknowledge
2
from master
1
0
A
A
7
6
5
4
I0.x
3
acknowledge
2
from master
1
0
A
7
6
5
Figure
4
I1.x
3
non acknowledge
11).
2
from master
STOP condition
1
0
002aah131
1
P