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PCF8574 Datasheet(PDF) 5 Page - Texas Instruments

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Part # PCF8574
Description  REMOTE 8-BIT I/O EXPANDER FOR I2C BUS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCF8574 Datasheet(HTML) 5 Page - Texas Instruments

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background image
A
A
S
0
1
0
0
A1
A2
A0
0
Start
Condition
ACK
From Slave
ACK
From Slave
Data
Data
Slave Address
R/W
P7
P6
1
P0
P7
P0
A
Integral Multiples of Two Bytes
P5
tpv
IOHT
tir
SCL
SDA
Write to
Port
Data Output
Voltage
P5 Output
Voltage
P5 Pullup
Output
Current
INT
ACK
From Slave
Data A0
and B0
Valid
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
IOH
A
A
S
0
1
0
0
A1
A2
A0
1
ACK
From Slave
ACK
From Master
R/W
P7 P6
P0
P7
ACK
From Master
tsu
tir
SCL
SDA
Read From
Port
Data Into
Port
INT
P5
P4
P3
P2 P1
A
P0
tir
tiv
P7 to P0
A low-to-high transition of SDA while SCL is high is defined as the stop condition (P). The transfer of data can be stopped at any moment by
a stop condition. When this occurs, data present at the latest ACK phase is valid (output mode). Input data is lost.
P6
P5 P4
P3 P2
P1
th
P7 P6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
P7 to P0
PCF8574
www.ti.com ............................................................................................................................................................... SCPS068G – JULY 2001 – REVISED MAY 2008
Figure 1 and Figure 2 show the address and timing diagrams for the write and read modes, respectively.
Figure 1. Write Mode (Output)
Figure 2. Read Mode (Input)
Copyright © 2001–2008, Texas Instruments Incorporated
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