Datasheet > 传感器/换能器 > 温度传感器> DS1721U/T,R

DS1721U/T,R

更新时间： 2024-01-21 14:28:31

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

DS1721U/T,R 数据手册

DS1721

The active state for the totem-pole output is programmable by the user. The power-up default of the

DS1721 has TH=80°C, TL=75°C, and the output state active high. Refer to the “OPERATION-

Programming” section for instructions in adjusting the thermostat setpoints and T_COMactive state.

THERMOSTAT OUTPUT OPERATION Figure 2

OPERATION-Programming

There are two areas of interest in programming the DS1721: the Configuration/Status register and the

thermostat setpoints. All programming is done via the 2-wire interface using the protocols discussed in

the “Command Set” section.

Configuration/Status Register Programming

The configuration/status register is accessed via the Access Config (ACh) function command. Writing to

or reading from the register is determined by the R/ W bit of the 2-wire control byte (See “2-wire Serial

Data Bus” section). Data is read from or written to the configuration register MSb first. The format of the

below along with the power-up state of the bit and its ability to be read or written to. The entire register is

volatile and will always power-up in the default state. Therefore, it is recommended that the user issue

any configuration programming commands immediately after power is cycled, before any other

commands are issued.

CONFIGURATION/STATUS REGISTER Figure 3

DONE

MSb

POL

1SHOT

LSb

1SHOT = Temperature Conversion Mode. If 1SHOT is "1", the DS1721 will perform and store one

temperature conversion upon reception of the Start Convert T (51h) command. If 1SHOT is "0", the

DS1721 will continuously perform temperature conversions and store the last completed result in the

Thermometer Register. The user has read/write access to the bit and the power-up default state is "0"

(continuous mode).

POL = TCOM Polarity Bit. If POL is "1", the active state of the TCOM output will be high. A "0" stored

in this location sets the thermostat output to an active low state. The user has read/write access to the

POL bit, and the power-up default state is "1" (active high).

U = Undefined. This bit is used internally by the DS1721. It will be a "0" at power-up and will change to

a "1" once the Start Convert T [51h] command is issued. This is a “Don’t Care” on a write; i.e. The

DS1721 will ignore writes to this location.

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与DS1721U/T,R相关器件

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

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