參數(shù)資料
型號(hào)： PCF8574
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Remote 8-bit I/O expander for I2C-bus
中文描述： SPECIALTY MICROPROCESSOR CIRCUIT
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 156K
代理商： PCF8574
1997 Apr 02
6
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
6
CHARACTERISTICS OF THE I
2
C-BUS
The I
2
C-bus is for 2-way, 2-line communication between
different ICs or modules. The two lines are a serial data
line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when
connected to the output stages of a device. Data transfer
may be initiated only when the bus is not busy.
6.1
Bit transfer
One data bit is transferred during each clock pulse. The
data on the SDA line must remain stable during the HIGH
period of the clock pulse as changes in the data line at this
time will be interpreted as control signals (see Fig.4).
6.2
Start and stop conditions
Both data and clock lines remain HIGH when the bus is not
busy. A HIGH-to-LOW transition of the data line, while the
clock is HIGH is defined as the start condition (S).
A LOW-to-HIGH transition of the data line while the clock
is HIGH is defined as the stop condition (P) (see Fig.5).
6.3
System configuration
A device generating a message is a ‘transmitter’, a device
receiving is the ‘receiver’. The device that controls the
message is the ‘master’ and the devices which are
controlled by the master are the ‘slaves’ (see Fig.6).
Fig.4 Bit transfer.
MBC621
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig.5 Definition of start and stop conditions.
MBC622
SDA
SCL
P
STOP condition
SDA
SCL
S
START condition
Fig.6 System configuration.
MBA605
MASTER
TRANSMITTER /
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER /
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER /
RECEIVER
SDA
SCL
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8574_02 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Remote 8-bit I/O expander for I2C-bus
PCF8574_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE 8-BIT I/O EXPANDER FOR I2C BUS
PCF8574_08 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE 8-BIT I/O EXPANDER FOR I2C BUS
PCF8574_10 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE 8-BIT I/O EXPANDER FOR I2C BUS
PCF8574A 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE 8BIT I/O EXPANDER FOR I2C BUS
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