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参数资料
| 型号： | DS2450S |
| 英文描述： | 1-Wire Quad A/D Converter |
| 中文描述： | 1线四通道A / D转换器 |
| 文件页数： | 3/24页 |
| 文件大小： | 523K |
| 代理商： | DS2450S |
DS2450
3 of 24
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HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL
Figure 2
The DS2450 uses the standard Dallas Semiconductor 1-Wire protocol for data transfers. Communication
to and from the DS2450 requires a single bi-directional line that is typically a port pin of a
microcontroller. The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The 1-Wire bus
master must first provide one of the seven ROM Function Commands, 1) Read ROM, 2) Match ROM, 3)
Search ROM, 4) Conditional Search ROM, 5) Skip ROM, 6) Overdrive-Skip ROM or 7) Overdrive-
Match ROM. Upon completion of an overdrive ROM command byte executed at standard speed, the
device will enter Overdrive mode where all subsequent communication occurs at a higher speed. The
protocol required for these ROM function commands is described in Figure 9. After a ROM function
command is successfully executed, the memory and control functions become accessible and the master
may provide any one of the available commands. The protocol for these commands is described in Figure
6. All data is read and written least significant bit first.
64-BIT LASERED ROM
Each DS2450 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family
code. The next 48 bits are a unique serial number. The last eight bits are a CRC of the first 56 bits. (See
Figure 3.) The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and
XOR gates as shown in Figure 4. The polynomial is X
8
+ X
5
+ X
4
+ 1. Additional information about the
Dallas 1-Wire Cyclic Redundancy Check is available in the Book of DS19xx iButton
TM
Standards. The
shift register acting as the CRC accumulator is initialized to zero. Then starting with the least significant
bit of the family code, one bit at a time is shifted in. After the 8
th
bit of the family code has been entered,
then the serial number is entered. After the 48
th
bit of the serial number has been entered, the shift
register contains the CRC value. Shifting in the eight bits of CRC should return the shift register to all
zeros.
相关PDF资料 |
PDF描述 |
|---|---|
| DS2480 | Serial 1.Wire Line Driver |
| DS2480S | Serial 1.Wire Line Driver |
| DS2490 | USB to 1-Wire Bridge Chip |
| DS2490S | USB to 1-Wire Bridge Chip |
| DS2502-E64 | IEEE EUI-64 Node Address Chip |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2450S/T&R | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| DS2450S+ | 功能描述:模数转换器 - ADC Quad 1-Wire RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| DS2450S+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| DS2450S+T&R | 制造商:Maxim Integrated Products 功能描述:IC CONVERTER A/D QUAD 1-W 8-SOIC |
| DS2450S+T&R | 功能描述:模数转换器 - ADC Quad 1-Wire RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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