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)： 7/24頁(yè)
文件大小： 156K
代理商： PCF8574
1997 Apr 02
7
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
6.4
Acknowledge
The number of data bytes transferred between the start
and the stop conditions from transmitter to receiver is not
limited. Each byte of eight bits is followed by one
acknowledge bit. The acknowledge bit is a HIGH level put
on the bus by the transmitter whereas the master
generates an extra acknowledge related clock pulse.
A slave receiver which is addressed must generate an
acknowledge after the reception of each byte. Also a
master must generate an acknowledge after the reception
of each byte that has been clocked out of the slave
transmitter. The device that acknowledges has to pull
down the SDA line during the acknowledge clock pulse, so
that the SDA line is stable LOW during the HIGH period of
the acknowledge related clock pulse, set-up and hold
times must be taken into account.
A master receiver must signal an end of data to the
transmitter by
not
generating an acknowledge on the last
byte that has been clocked out of the slave. In this event
the transmitter must leave the data line HIGH to enable the
master to generate a stop condition.
Fig.7 Acknowledgment on the I
2
C-bus.
MBC602
S
START
CONDITION
9
8
2
1
clock pulse for
acknowledgement
not acknowledge
acknowledge
DATA OUTPUT
BY TRANSMITTER
DATA OUTPUT
BY RECEIVER
SCL FROM
MASTER
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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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