參數(shù)資料
型號(hào)： PCF8574T
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 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(yè)數(shù)： 8/24頁(yè)
文件大小： 132K
代理商： PCF8574T
2002 Nov 22
8
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 (see Fig.8). 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.8 Acknowledgment on the I
2
C-bus.
handbook, full pagewidth
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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參數(shù)描述
PCF8574T K72741 制造商:NXP Semiconductors 功能描述:
PCF8574T 制造商:NXP Semiconductors 功能描述:IC SM I/O EXPANDER 8-BIT
PCF8574T/3 制造商:NXP Semiconductors 功能描述:I/O Expander 16-Pin SO 制造商:NXP Semiconductors 功能描述:I/O Expander 16-Pin SO Bulk 制造商:NXP Semiconductors 功能描述:I/O EXPANDER 8BIT REMOTE SO-16 制造商:NXP Semiconductors 功能描述:I/O EXPANDER, 8BIT REMOTE, SO-16
PCF8574T/3,512 功能描述:I2C 接口集成電路 REMOTE I/O EXPANDER RoHS:否 制造商:NXP Semiconductors 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 最大工作頻率:400 KHz 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-16
PCF8574T/3,518 功能描述:接口-I/O擴(kuò)展器 I/O EXPANDER I2C RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
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