參數(shù)資料
型號: PCF8574T
廠商: NXP Semiconductors N.V.
元件分類: I2C/I2S
英文描述: Remote 8-bit I-O expander for I2C-bus
封裝: PCF8574AP<SOT38-4 (DIP16)|<<http://www.nxp.com/packages/SOT38-4.html<1<Always Pb-free,;PCF8574AT/3<SOT162-1 (SO16)|<<http://www.nxp.com/packages/SOT162-1.html<1<wee
文件頁數(shù): 9/24頁
文件大?。?/td> 132K
代理商: PCF8574T
2002 Nov 22
9
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
7
FUNCTIONAL DESCRIPTION
Fig.9 Simplified schematic diagram of each I/O.
handbook, full pagewidth
MBD977
D
Q
CI
S
FF
D
Q
CI
S
FF
100
μ
A
to interrupt
logic
VSS
P0 to P7
VDD
write pulse
data from
shift register
power-on
reset
read pulse
data to
shift register
7.1
Addressing
For addressing see Figs 10, 11 and 12.
Fig.10 PCF8574 and PCF8574A slave addresses.
handbook, full pagewidth
MBD973
S
0
1
0
0
A2
A1
A0
0
A
1
0
slave address
slave address
A
S
0
1
1
A2
A1
A0
a. PCF8574.
b. PCF8574A.
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).
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