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DS1822+

更新时间： 2024-02-07 20:53:00
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
21页 223K
描述
Econo 1-Wire Digital Thermometer

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中文翻译

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DS1822+ 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：SOP8,.25
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01Factory Lead Time：6 weeks
风险等级：1.59Samacsys Description：Board Mount Temperature Sensors Econo 1-Wire Digital Thermometer
最大精度（摄氏度）：2 Cel其他特性：COMPLIANCE TO MIL-150
主体宽度：3.91 mm主体高度：1.55 mm
主体长度或直径：4.88 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：1.5 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：SOP8,.25
封装形状/形式：RECTANGULAR电源：3.3/5 V
传感器/换能器类型：TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL子类别：Other Sensors/Transducers
最大供电电压：5.5 V最小供电电压：3 V
表面贴装：YES端子面层：Matte Tin (Sn)
端接类型：SOLDER

DS1822+ 数据手册

 浏览型号DS1822+的Datasheet PDF文件第5页浏览型号DS1822+的Datasheet PDF文件第6页浏览型号DS1822+的Datasheet PDF文件第7页浏览型号DS1822+的Datasheet PDF文件第9页浏览型号DS1822+的Datasheet PDF文件第10页浏览型号DS1822+的Datasheet PDF文件第11页 
DS1822  
CONFIGURATION REGISTER  
Byte 4 of the scratchpad memory contains the configuration register, which is organized as  
illustrated in Figure 8. The user can set the conversion resolution of the DS1822 using the R0 and R1  
bits in this register as shown in Table 3. The power-up default of these bits is R0 = 1 and R1 = 1 (12-bit  
resolution). Note that there is a direct tradeoff between resolution and conversion time. Bit 7 and bits 0–4  
in the configuration register are reserved for internal use by the device and cannot be overwritten.  
CONFIGURATION REGISTER Figure 8  
bit 7  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
0
R1  
R0  
1
1
1
1
1
THERMOMETER RESOLUTION CONFIGURATION Table 3  
R1  
0
R0  
0
Resolution  
9-bit  
Max Conversion Time  
93.75ms  
187.5ms  
375ms  
(tCONV/8)  
(tCONV/4)  
(tCONV/2)  
(tCONV  
0
1
10-bit  
1
0
11-bit  
1
1
12-bit  
750ms  
)
CRC GENERATION  
CRC bytes are provided as part of the DS1822’s 64-bit ROM code and in the 9th byte 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 DS1822. To verify that data has been  
read correctly, the bus master must recalculate 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 DS1822 that prevents a command sequence from proceeding if the DS1822 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 recalculate the CRC and compare it to the CRC values from the DS1822 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 56th bit from the ROM or the most significant bit of byte 7 from the scratchpad, the  
polynomial generator will contain the recalculated CRC. Next, the 8-bit ROM code or scratchpad CRC  
from the DS1822 must be shifted into the circuit. At this point, if the recalculated CRC was correct, the  
shift register will contain all 0s. Additional information about the Dallas 1-Wire cyclic redundancy check  
8 of 21  
1...567891011...21

中文翻译

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