PCA9555AHF,128 NXP Semiconductors, PCA9555AHF,128 Datasheet - Page 12

• Manufacturer Part Number: PCA9555AHF,128
• Description: Interface - I/O Expanders
• Manufacturer: NXP Semiconductors

Specifications of PCA9555AHF,128

• Rohs: yes
• Maximum Operating Frequency: 100 kHz
• Operating Supply Voltage: 1.65 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: HWQFN-24
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders

Fig 10. Read input port register, scenario 1
data into port 0
data into port 1
SDA
read from port 0
read from port 1
INT
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 the actual data transfer from P port (see
1
0
2
1
slave address
t
3
v(INT)
0
4
0 A2 A1 A0 1
5
6
acknowledge
from slave
7
R/W
8
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
4
I1.x
Figure
3
non acknowledge
2
from master
STOP condition
9).
1
0
002aah347
1
P