参数资料
型号: PCF8591T-T
厂商: NXP SEMICONDUCTORS
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO16
封装: 7.50 MM, PLASTIC, SOT162-1, SO-16
文件页数: 5/28页
文件大小: 139K
代理商: PCF8591T-T
2003 Jan 27
13
Philips Semiconductors
Product specication
8-bit A/D and D/A converter
PCF8591
8.3
System conguration
A device generating a message is a ‘transmitter’, a device receiving a message is the ‘receiver’. The device that controls
the message is the ‘master’ and the devices which are controlled by the master are the ‘slaves’.
8.4
Acknowledge
The number of data bytes transferred between the start and stop conditions from transmitter to receiver is not limited.
Each data 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 also 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. 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.
MBA605
MASTER
TRANSMITTER /
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER /
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER /
RECEIVER
SDA
SCL
Fig.14 System configuration.
Fig.15 Acknowledgement on the I2C-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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