CAT9554AHV4I-GT2 ON Semiconductor, CAT9554AHV4I-GT2 Datasheet - Page 10

• Manufacturer Part Number: CAT9554AHV4I-GT2
• Description: Interface - I/O Expanders 8B I2C/SMBUS I/O PT W/INT
• Manufacturer: ON Semiconductor

Specifications of CAT9554AHV4I-GT2

• Product Category: Interface - I/O Expanders
• Rohs: yes
• Logic Family: CAT9554A
• Number Of I/os: 8
• Maximum Operating Frequency: 400 KHz
• Operating Supply Voltage: 2.3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-16
• Interface Type: I2C, SMBus
• Interrupt Output: Yes
• Operating Current: 104 uA
• Output Current: 3 mA
• Power Dissipation: 1 W
• Product Type: I/O Expanders

Power−On Reset Operation
power−on reset pulse holds the CAT9554/9554A in a reset
state until V
READ FROM
PORT
DATA INTO
PORT
S 0 1 0 0 A2
When the power supply is applied to V
SDA
SCL
INT
acknowledge from slave
t
start condition
slave address
IV
S
1
CC
0
2
reaches V
1
slave address
3
A1
0
A0 0
4
0 A2
R/W
POR
5
DATA 1
acknowledge
from slave
A1
A
6
level. At this point, the reset
A0 1
7
acknowledge from slave
t
PH
t
R/W
IR
COMMAND BYTE
8
CC
A
9
Figure 13. Read Input Port Register
pin, an internal
Figure 12. Read from Register
At this moment master−transmitter becomes
DATA 2
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data from port
master−receiver and slave−receiver
DATA 1
A S
DATA 3
10
acknowledge
becomes slave−transmitter
from master
condition is released and the internal state machine and the
CAT9554/9554A registers are initialized to their default
state.
t
0
PS
acknowledge from slave
1 0
slave address
0 A2 A1 A0
A
R/W
data from port
1
A
DATA 4
data from register
no acknowledge
DATA 4
acknowledge from master
last byte
from master
data from register
no acknowledge
DATA
first byte
from master
DATA
NA P
condition
stop
NA
A
P