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CAT9554AYI-GT2 Datasheet(PDF) 11 Page - ON Semiconductor

No. de pieza CAT9554AYI-GT2
Descripción Electrónicos  8-bit I짼C and SMBus I/O Port with Interrupt
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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CAT9554AYI-GT2 Datasheet(HTML) 11 Page - ON Semiconductor

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CAT9554, CAT9554A
© 2008 SCILLC. All rights reserved
11
Doc. No. MD-9002, Rev. F
Characteristics subject to change without notice
POWER-ON RESET OPERATION
When the power supply is applied to VCC pin, an
internal
power-on
reset
pulse
holds
the
CAT9554/9554A in a reset state until VCC reaches
VPOR level. At this point, the reset condition is released
and
the
internal
state
machine
and
the
CAT9554/9554A registers are initialized to their
default state.
Figure 11. Read from Register
Figure 12. Read Input Port Register
DATA
S
0
100
A2
A0
0
A
A1
0
1
0
0
A2 A1 A0
A
DATA
A
acknowledge
from master
acknowledge from slave
R/W
slave address
slave address
data from register
COMMAND BYTE
AS
1
acknowledge from slave
acknowledge from slave
R/W
At this moment master-transmitter becomes
master-receiver and slave-receiver
becomes slave-transmitter
NA
no acknowledge
from master
data from register
P
last byte
first byte
12
3
4
5
6
7
8
9
SCL
SDA
READ FROM
PORT
DATA INTO
PORT
S
010
0
A2
A0
1
A
A1
A
DATA 4
NA
P
no acknowledge
from master
acknowledge
from master
acknowledge
from slave
R/W
slave address
data from port
start condition
stop
condition
DATA 2
tPS
tPH
DATA 3
DATA 4
DATA 1
data from port
tIV
tIR
INT
DATA 1


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