參數(shù)資料
型號: PCA9675
廠商: NXP Semiconductors N.V.
英文描述: Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt
中文描述: 遠程16位I / O擴展調(diào)頻I2C總線的中斷
文件頁數(shù): 18/34頁
文件大?。?/td> 185K
代理商: PCA9675
PCA9675_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 1 February 2007
18 of 34
NXP Semiconductors
PCA9675
Remote 16-bit I/O expander for Fm+ I
2
C-bus with interrupt
9.3 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 22. System configuration
002aaa966
MASTER
TRANSMITTER/
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER/
RECEIVER
SDA
SCL
I
2
C-BUS
MULTIPLEXER
SLAVE
Fig 23. Acknowledgement on the I
2
C-bus
002aaa987
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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