DS1825U+

更新时间： 2024-01-27 12:51:17

品牌	Logo	应用领域
美信 - MAXIM		模拟IC 信号电路光电二极管
页数	文件大小	规格书
21页	286K
描述
Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID

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中文翻译

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技术参数
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DS1825U+ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	TSSOP,	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	6 weeks
风险等级：	0.94	Samacsys Description：	Board Mount Temperature Sensors Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	125 °C
最低工作温度：	-55 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1.1 mm
最大供电电压 (Vsup)：	3.7 V	最小供电电压 (Vsup)：	3 V
表面贴装：	YES	温度等级：	MILITARY
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	宽度：	3 mm

DS1825U+ 数据手册

DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID

Table 4. THERMOMETER RESOLUTION CONFIGURATION

Resolution

9-bit

Max Conversion Time

93.75ms

187.5ms

375ms

(t_CONV/8)

(t_CONV/4)

(t_CONV/2)

10-bit

11-bit

12-bit

750ms

(t_CONV)

CRC GENERATION

CRC bytes are provided as part of the DS1825’s 64-bit ROM code and in the 9^thbyte of the scratchpad memory.

The ROM code CRC is calculated from the first 56 bits of the ROM code and is contained in the most significant

byte of the ROM. The scratchpad CRC is calculated from the data stored in the scratchpad, and therefore it

changes when the data in the scratchpad changes. The CRCs provide the bus master with a method of data

validation when data is read from the DS1825. To verify that data has been read correctly, the bus master must re-

calculate the CRC from the received data and then compare this value to either the ROM code CRC (for ROM

reads) or to the scratchpad CRC (for scratchpad reads). If the calculated CRC matches the read CRC, the data has

been received error free. The comparison of CRC values and the decision to continue with an operation are

determined entirely by the bus master. There is no circuitry inside the DS1825 that prevents a command sequence

from proceeding if the DS1825 CRC (ROM or scratchpad) does not match the value generated by the bus master.

The equivalent polynomial function of the CRC (ROM or scratchpad) is:

CRC = X⁸+ X⁵+ X⁴+ 1

The bus master can re-calculate the CRC and compare it to the CRC values from the DS1825 using the polynomial

generator shown in Figure 9. This circuit consists of a shift register and XOR gates, and the shift register bits are

initialized to 0. Starting with the least significant bit of the ROM code or the least significant bit of byte 0 in the

scratchpad, one bit at a time should shifted into the shift register. After shifting in the 56^thbit from the ROM or the

most significant bit of byte 7 from the scratchpad, the polynomial generator will contain the re-calculated CRC.

Next, the 8-bit ROM code or scratchpad CRC from the DS1825 must be shifted into the circuit. At this point, if the

re-calculated CRC was correct, the shift register will contain all 0s. Additional information about the Dallas 1-Wire

cyclic redundancy check is available in Application Note 27 entitled “Understanding and Using Cyclic Redundancy

Checks with Dallas Semiconductor Touch Memory Products.”

Figure 9. CRC GENERATOR

INPUT

XOR

(MSB)

(LSB)

1-Wire BUS SYSTEM

The 1-Wire bus system uses a single bus master to control one or more slave devices. The DS1825 is always a

slave. When there is only one slave on the bus, the system is referred to as a “single-drop” system; the system is

“multidrop” if there are multiple slaves on the bus.

All data and commands are transmitted least significant bit first over the 1-Wire bus.

The following discussion of the 1-Wire bus system is broken down into three topics: hardware configuration,

transaction sequence, and 1-Wire signaling (signal types and timing).

9 of 21

1...6 7 8910 11 12...21

中文翻译

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DS1825U+ 替代型号

型号	品牌	替代类型	描述	数据表
DS1825U/T&R	MAXIM	类似代替	暂无描述
DS1825U	MAXIM	类似代替	Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID

与DS1825U+相关器件

型号	品牌	获取价格	描述	数据表
DS1825U+TR	MAXIM	获取价格	Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DS1825UTR	MAXIM	获取价格	Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DS1830	DALLAS	获取价格	Reset Sequence Pushbutton
DS1830	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, PDIP8,
DS1830	ADI	获取价格	顺序复位按钮
DS1830+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, PDIP8, 0.300 INCH, DIP-8
DS1830A	DALLAS	获取价格	Reset Sequence Pushbutton
DS1830A	ADI	获取价格	顺序复位按钮
DS1830A+	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8, 0.300 INCH, DIP-8
DS1830A+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, PDIP8, 0.300 INCH, DIP-8

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