Datasheet > 传感器/换能器 > 温度传感器> DS1721S/T&R

DS1721S/T&R

更新时间： 2024-01-17 06:22:00

品牌	Logo	应用领域
美信 - MAXIM		传感器换能器输出元件监控
页数	文件大小	规格书
17页	269K
描述
Serial Switch/Digital Sensor, 12 Bit(s), 1Cel, Rectangular, 8 Pin, Surface Mount, 0.150 INCH, SOIC-8

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技术参数
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DS1721S/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

DS1721S/T&R 数据手册

DS1721

If the user does not wish to take advantage of the thermostat capabilities of the DS1721, the 24 bits can be

used for general storage of system data that need not be maintained following a power loss. However, the

T_OUTpin should be left floating if general data is stored in T_H/T_L.

2-WIRE SERIAL DATA BUS

The DS1721 supports a bi-directional 2-wire bus and data transmission protocol. A device that sends data

onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls

the message is called a “master.” The devices that are controlled by the master are “slaves.” The bus must

be controlled by a master device which generates the serial clock (SCL), controls the bus access, and

generates the START and STOP conditions. The DS1721 operates as a slave on the 2-wire bus.

Connections to the bus are made via the open-drain I/O lines SDA and SCL.

The following bus protocol has been defined (See Figure 5):

Sꢀ Data transfer may be initiated only when the bus is not busy.

Sꢀ During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in

the data line while the clock line is high will be interpreted as control signals.

Accordingly, the following bus conditions have been defined:

Bus not busy: Both data and clock lines remain HIGH.

Start data transfer: A change in the state of the data line, from HIGH to LOW, while the clock is HIGH,

defines a START condition.

Stop data transfer: A change in the state of the data line, from LOW to HIGH, while the clock line is

HIGH, defines the STOP condition.

Data valid: The state of the data line represents valid data when, after a START condition, the data line

is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed

during the LOW period of the clock signal. There is one clock pulse per bit of data.

Each data transfer is initiated with a START condition and terminated with a STOP condition. The

number of data bytes transferred between START and STOP conditions is not limited, and is determined

by the master device. The information is transferred byte-wise and each receiver acknowledges with a 9^th

bit.

Within the bus specifications a regular mode (100 kHz clock rate) and a fast mode (400 kHz clock rate)

are defined. The DS1721 works in both modes.

Acknowledge: Each receiving device, when addressed, is obliged to generate an acknowledge after the

reception of each byte. The master device must generate an extra clock pulse which is associated with this

acknowledge bit.

A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a

way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Of

course, setup and hold times must be taken into account. A master must signal an end of data to the slave

by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case,

the slave must leave the data line HIGH to enable the master to generate the STOP condition.

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与DS1721S/T&R相关器件

型号	品牌	描述	获取价格	数据表
DS1721S/T&R+W	MAXIM	Serial Switch/Digital Sensor,	获取价格
DS1721S/T,R	MAXIM	2-Wire Digital Thermometer and Thermostat	获取价格
DS1721S+	MAXIM	Serial Switch/Digital Sensor, 12 Bit(s), 1Cel, Rectangular, 8 Pin, Surface Mount, 0.150 IN	获取价格
DS1721S-T,R	MAXIM	2-Wire Digital Thermometer and Thermostat	获取价格
DS1721U	MAXIM	2-Wire Digital Thermometer and Thermostat	获取价格
DS1721U/T&R+W	MAXIM	暂无描述	获取价格

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