PCF8574_15 Datasheet, PDF (14/36 Pages) Texas Instruments – Remote 8-Bit I/O Expander for I2C Bus

PCF8574
SCPS068I – JULY 2001 – REVISED NOVEMBER 2015
Device Functional Modes (continued)
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SCL _{1 2 3 4 5 6 7 8}
12 3 4 5 6 7 8
1 23 456 78
ACK
R/W ^{From Slave}
ACK
From Master
ACK
From Master
SDA ^{S 0 1 0 0 A2 A1 A0 1 A P7 P6 P5 P4 P3 P2 P1 P0 A P7 P6 P5 P4 P3 P2 P1 P0 A P7 P6}
Read From
Port
Data Into
Port
P7 to P0
P7 to P0
t_h
t_su
INT
t_iv
t_ir
t_ir
A. 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 bya stop condition. When this occurs, data present at the latest ACK phase is valid (output
mode). Input data is lost.
Figure 17. Read Mode (Input)
14
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