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DS1621 参数 Datasheet PDF下载

DS1621图片预览
型号: DS1621
PDF下载: 下载PDF文件 查看货源
内容描述: 数字温度计和温度监控器 [Digital Thermometer and Thermostat]
分类和应用: 传感器换能器温度传感器输出元件监控
文件页数/大小: 16 页 / 649 K
品牌: DALLAS [ DALLAS SEMICONDUCTOR ]
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DS1621  
COMMAND SET  
Data and control information is read from and written to the DS1621 in the format shown in Figure 5. To  
write to the DS1621, the master will issue the slave address of the DS1621 and the R/ bit will be set to  
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“0”. After receiving an acknowledge, the bus master provides a command protocol. After receiving this  
protocol, the DS1621 will issue an acknowledge and then the master may send data to the DS1621. If the  
DS1621 is to be read, the master must send the command protocol as before and then issue a repeated  
START condition and the control byte again, this time with the R/ bit set to “1” to allow reading of the  
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data from the DS1621. The command set for the DS1621 as shown in Table 3 is as follows:  
Read Temperature [AAh]  
This command reads the last temperature conversion result. The DS1621 will send 2 bytes, in the format  
described earlier, which are the contents of this register.  
Access TH [A1h]  
If R/  
is “0” this command writes to the TH (HIGH TEMPERATURE) register. After issuing this  
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command, the next 2 bytes written to the DS1621, in the same format as described for reading  
temperature, will set the high temperature threshold for operation of the TOUT output. If R/  
value stored in this register is read back.  
is “1” the  
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Access TL [A2h]  
If R/  
is “0” this command writes to the TL (LOW TEMPERATURE) register. After issuing this  
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command, the next 2 bytes written to the DS1621, in the same format as described for reading  
temperature, will set the high temperature threshold for operation of the TOUT output. If R/  
value stored in this register is read back.  
is “1” the  
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Access Config [ACh]  
If R/  
is “0” this command writes to the configuration register. After issuing this command, the next  
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data byte is the value to be written into the configuration register. If R/ is “1” the next data byte read is  
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the value stored in the configuration register.  
Read Counter [A8h]  
This command reads the value of the counter byte. This command is valid only if R/ is “1”.  
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Read Slope [A9h]  
This command reads the value of the slope counter byte from the DS1621. This command is valid only if  
R/ is “1”.  
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Start Convert T [EEh]  
This command begins a temperature conversion. No further data is required. In one–shot mode the  
temperature conversion will be performed and then the DS1621 will remain idle. In continuous mode this  
command will initiate continuous conversions.  
Stop Convert T [22h]  
This command stops temperature conversion. No further data is required. This command may be used to  
halt a DS1621 in continuous conversion mode. After issuing this command, the current temperature  
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