8574A View Datasheet(PDF) - Philips Electronics
Part Name
Description
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8574A Datasheet PDF : 24 Pages
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Philips Semiconductors
Remote 8-bit I/O expander for I2C-bus
7 FUNCTIONAL DESCRIPTION
Product specification
PCF8574
handbook, full pagewidth
write pulse
data from
shift register
power-on
reset
read pulse
data to
shift register
DQ
FF
CI
S
DQ
FF
CI
S
VDD
100
µA
P0 to P7
V SS
to interrupt
logic
MBD977
Fig.9 Simplified schematic diagram of each I/O.
7.1 Addressing
For addressing see Figs 10, 11 and 12.
handbook, full pagewidth
slave address
S 0 1 0 0 A2 A1 A0 0 A
a. PCF8574.
slave address
S 0 1 1 1 A2 A1 A0 0 A
MBD973
b. PCF8574A.
Fig.10 PCF8574 and PCF8574A slave addresses.
Each of the PCF8574’s eight I/Os can be independently used as an input or output. Input data is transferred from the
port to the microcontroller by the READ mode (see Fig.12). Output data is transmitted to the port by the WRITE mode
(see Fig.11).
2002 Nov 22
9
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