CAT9554A ONSEMI [ON Semiconductor], CAT9554A Datasheet - Page 11

• Manufacturer Part Number: CAT9554A
• Manufacturer: ONSEMI [ON Semiconductor]

POWER-ON RESET OPERATION
When the power supply is applied to V
internal
CAT9554/9554A in a reset state until V
V
READ FROM
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Characteristics subject to change without notice
S
POR
DATA INTO
0
level. At this point, the reset condition is released
PORT
PORT
SDA
SCL
INT
1
slave address
acknowledge from slave
0
t
start condition
IV
power-on
S
0 A2
1
0
2
A1
1
slave address
3
A0
0
R/W
4
reset
0
0
A2
5
DATA 1
A
acknowledge
A1
6
from slave
pulse
A0
COMMAND BYTE
7
acknowledge from slave
t
PH
t
IR
R/W
1
8
Figure 12. Read Input Port Register
Figure 11. Read from Register
9
A
holds
CC
CC
reaches
pin, an
DATA 2
At this moment master-transmitter becomes
the
data from port
A
master-receiver and slave-receiver
DATA 1
11
S
DATA 3
and
CAT9554/9554A registers are initialized to their
default state.
0
acknowledge
becomes slave-transmitter
from master
t
PS
1
slave address
acknowledge from slave
0
the
0
A2 A1 A0
A
internal
R/W
1
state
A
data from port
DATA 4
data from register
DATA 4
no acknowledge
data from register
CAT9554, CAT9554A
machine
last byte
from master
DATA
no acknowledge
first byte
DATA
from master
Doc. No. MD-9002, Rev. F
acknowledge
from master
and
NA
stop
condition
NA
P
A
the
P