参数资料
型号: DS1721S/T&R
厂商: Maxim Integrated
文件页数: 8/17页
文件大小: 257K
描述: IC THERMOMETER/STAT DIG HP 8SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
功能: 温度计,恒温计
传感器类型: 内部
感应温度: -55°C ~ 125°C
精确度: ±2°C(最小值)
拓扑: ADC,比较器,寄存器库
输出类型: 2 线串行,I²C?/SMBUS?
输出警报:
输出风扇:
电源电压: 2.7 V ~ 5.5 V
工作温度: -55°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
DS1721
 
 
 
8 of 17
DATA TRANSFER ON 2-WIRE SERIAL BUS Figure 5
 
 
 
Figure 6 details how data transfer is accomplished on the two-wire bus. Depending upon the state of the
R/
W  bit, two types of data transfer are possible: 
 
Data transfer from a master transmitter to a slave receiver. The 1
st
 byte transmitted by the master is
the slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after each
received byte.
 
Data transfer from a slave transmitter to a master receiver. The  1
st
  byte (the slave address) is
transmitted by the master. The slave then returns an acknowledge bit. Next follows a number of data
bytes transmitted by the slave to the master. The master returns an acknowledge bit after all received
bytes other than the last byte. At the end of the last received byte, a not acknowledge is returned.
 
The master device generates all of the serial clock pulses and the START and STOP conditions. A
transfer is ended with a STOP condition or with a repeated START condition. Since a repeated START
condition is also the beginning of the next serial transfer, the bus will not be released.
 
The DS1721 may operate in the following two modes:
 
Slave receiver mode: Serial  data  and  clock  are  received  through  SDA  and  SCL.  After  each  byte  is 
received, an acknowledge bit is transmitted. START and STOP conditions are recognized as the
beginning and end of a serial transfer. Address recognition is performed by hardware after reception of
the slave address and direction bit.
 
Slave transmitter mode: The first byte is received and handled as in the slave receiver mode. However, 
in this mode, the direction bit will indicate that the transfer direction is reversed. Serial data is transmitted
on SDA by the DS1721 while the serial clock is input on SCL. START and STOP conditions are
recognized as the beginning and end of a serial transfer.
 
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