pca9539d NXP Semiconductors, pca9539d Datasheet - Page 10

• Manufacturer Part Number: pca9539d
• Description: 16-bit I2c And Smbus, Low Power I/o Port With Interrupt And Reset
• Manufacturer: NXP Semiconductors

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
1
2
1
3
1
t
IV
4
0
5
1
A1 A0
6
DATA 00
7
R/W ACKNOWLEDGE
8
1
9
A
FROM SLAVE
DATA 10
t
t
IR
ph
DATA 00
DATA 01
I0.x
Figure 10. READ input port register — scenario 2
A
ACKNOWLEDGE
FROM MASTER
t
ph
DATA 10
DATA 02
DATA 11
I1.x
A
ACKNOWLEDGE
FROM MASTER
t
ps
DATA 03
DATA 03
I0.x
A
ACKNOWLEDGE
FROM MASTER
t
ps
DATA 12
DATA 12
I1.x
NON ACKNOWLEDGE
FROM MASTER
SW02209
1
P