DS1821S+TR

更新时间： 2024-01-20 13:57:44

品牌	Logo	应用领域
达拉斯 - DALLAS		监控
页数	文件大小	规格书
18页	455K
描述
Programmable Digital Thermostat and Thermometer

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技术参数
数据手册

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DS1821S+TR 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	TO-220, 3 PIN	Reach Compliance Code：	unknown
风险等级：	5.78	Is Samacsys：	N
外壳：	PLASTIC	JESD-609代码：	e0
安装特点：	THROUGH HOLE MOUNT	位数：	8
端子数量：	3	最大工作电流：	1 mA
最高工作温度：	125 °C	最低工作温度：	-55 °C
输出接口类型：	1-WIRE INTERFACE	封装主体材料：	PLASTIC/EPOXY
封装等效代码：	SIP3,.1TB	封装形状/形式：	RECTANGULAR
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：	NO
端子面层：	Tin/Lead (Sn/Pb)	端接类型：	SOLDER
Base Number Matches：	1

DS1821S+TR 数据手册

DS1821

TEMPERATURE/DATA RELATIONSHIP Table 2

TEMPERATURE

DIGITAL OUTPUT

(Binary)

DIGITAL OUTPUT

(Hex)

+125°C*

+85°C

+25°C

0°C

0111 1101

0101 0101

0001 1001

0000 0000

1111 1111

1110 0111

1100 1001

7Dh

55h

19h

00h

FFh

E7h

C9h

-1°C

-25°C

-55°C

HIGH-RESOLUTION TEMPERATURE READINGS

The user can calculate temperature values with higher than 8-bit resolution using the data remaining in

the counter and slope accumulator when the temperature conversion is complete. To do this the user must

first read the temperature from the 8-bit temperature register. This value is called TEMP_READ in the

high-resolution equation (see Eq. 1). The 9-bit counter value must then be obtained by issuing the Read

Counter [A0h] command. This value is the count remaining in the counter at the end of the gate period

and is called COUNT_REMAIN in Eq. 1. Next the Load Counter [41h] command must be issued, which

loads the 9-bit slope accumulator value into the counter register. The slope accumulator value (called

COUNT_PER_C in Eq. 1) can then be read from the counter by again issuing the Read Counter [A0h]

command. The slope accumulator value is called “COUNT_PER_C” because it represents the number of

counts needed for an accurate measurement at a given temperature (i.e., the counts per degree C). The

high-resolution temperature can then be calculated using Eq. 1:

(COUNT _ PER _ C − COUNT _ REMAIN)

Eq. 1)

TEMPERATURE = TEMP_READ − 0.5 +

COUNT _ PER _ C

High-resolution temperature readings cannot be used while in continuous conversion mode. Also, the

Read Counter [A0h] and Load Counter [41h] commands must not be used while in continuous conversion

mode.

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