DS1721U/T,R

更新时间： 2024-02-27 12:54:30

品牌	Logo	应用领域
美信 - MAXIM		监控
页数	文件大小	规格书
17页	269K
描述
2-Wire Digital Thermometer and Thermostat

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DS1721U/T,R 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	TSSOP8,.19
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	6 weeks
风险等级：	1.36	最大精度（摄氏度）：	1 Cel
主体宽度：	3 mm	主体高度：	1.1 mm
主体长度或直径：	3 mm	外壳：	PLASTIC
JESD-609代码：	e3	安装特点：	SURFACE MOUNT
位数：	12	端子数量：	8
最大工作电流：	1.25 mA	最高工作温度：	125 °C
最低工作温度：	-55 °C	输出接口类型：	2-WIRE INTERFACE
封装主体材料：	PLASTIC/EPOXY	封装等效代码：	TSSOP8,.19
封装形状/形式：	SQUARE	电源：	3/5 V
传感器/换能器类型：	TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL	子类别：	Other Sensors
最大供电电压：	5.5 V	最小供电电压：	2.7 V
表面贴装：	YES	端子面层：	Matte Tin (Sn)
端接类型：	SOLDER	Base Number Matches：	1

DS1721

Each additional bit of resolution approximately doubles the conversion time, so 9-bit conversions can be

performed in less than a quarter of a second.

This is accomplished by issuing a command protocol to the configuration register. It is recommended that

the user issue the command protocol to program the configuration register before any temperature

conversion commands are issued after power-up. This is due to the fact that the configuration data is

stored in volatile memory and will always power-up in the default state. The configuration register

defines the conversion mode, thermometer resolution/conversion time, and active state of the thermostat

comparator output. It also contains 3 status bits denoting the state of temperature conversions and

thermostat flags.

The user can also program over-temperature (TH) and under-temperature (TL) setpoints for thermostatic

operation. The power-up state of TH is 80°C and that for TL is 75°C. The result of each temperature

conversion is compared with these setpoints. The thermostat output (T_OUT) becomes active when the

measured temperature exceeds the programmed TH, and remains latched in the active state until

temperature falls below TL. Thus, any hysteresis can be realized for fan control without external

components.

Digital data is written to/read from the DS1721 via a 2-wire interface, and all communication is MSb

first. Multipoint sensing is possible with the DS1721 by uniquely setting the 3-bit address of up to eight

parts on the 2-wire bus.

DS1721 FUNCTIONAL BLOCK DIAGRAM Figure 1

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型号	品牌	描述	获取价格	数据表
DS1721U+T&R	MAXIM	Serial Switch/Digital Sensor, 12 Bit(s), 1Cel, Square, 8 Pin, Surface Mount, LEAD FREE, US	获取价格
DS1721U-T,R	MAXIM	2-Wire Digital Thermometer and Thermostat	获取价格
DS1722	MAXIM	Digital Thermometer with SPI/3-Wire Interface	获取价格
DS1722	DALLAS	Digital Thermometer with SPI/3-Wire Interface	获取价格
DS1722	ADI	数字温度计，带有SPI/3线接口	获取价格
DS1722S	MAXIM	Digital Thermometer with SPI/3-Wire Interface	获取价格