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参数资料
| 型号： | DS2438Z+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/29页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SMART BATTERY 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 智能电池 |
| 电源电压： | 2.4 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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DS2438
64-BIT LASERED ROM FORMAT Figure 3
8-BIT CRC CODE
48-BIT SERIAL NUMBER
8-BIT FAMILY CODE (26h)
MSb
LSb
MSb
LSb
MSb
LSb
CRC Generation
The DS2438 has an 8-bit CRC stored in the most significant byte of the 64-bit ROM. The bus master can
compute a CRC value from the first 56 bits of the 64-bit ROM and compare it to the value stored within
the DS2438 to determine if the ROM data has been received error-free by the bus master. The equivalent
polynomial function of this CRC is:
CRC = X 8 + X 5 + X 4 +1
The DS2438 also generates an 8-bit CRC value using the same polynomial function shown above and
provides this value to the bus master to validate the transfer of data bytes. In each case where a CRC is
used for data transfer validation, the bus master must calculate a CRC value using the polynomial
function given above and compare the calculated value to either the 8-bit CRC value stored in the 64-bit
ROM portion of the DS2438 (for ROM reads) or the 8-bit CRC value computed within the DS2438
(which is read as a 9th byte when a scratchpad is read). The comparison of CRC values and decision to
continue with an operation are determined entirely by the bus master. There is no circuitry inside the
DS2438 that prevents a command sequence from proceeding if the CRC stored in or calculated by the
DS2438 does not match the value generated by the bus master. Proper use of the CRC as outlined in the
flowchart of Figure 6 can result in a communication channel with a very high level of integrity.
The 1-Wire CRC can be generated using a polynomial generator consisting of a shift register and XOR
gates as shown in Figure 4. 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.”
The shift register bits are initialized to 0. Then starting with the least significant bit of the family code,
1 bit at a time is shifted in. After the 8 th bit of the family code has been entered, the serial number is
entered. After the 48 th bit of the serial number has been entered, the shift register contains the CRC
value.
1-WIRE CRC CODE Figure 4
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相关代理商/技术参数 |
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|---|---|
| DS244 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Octal Buffer/Line Driver with 3-State Outputs |
| DS2441 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1-Cell Li-Ion Battery Manager |
| DS2442 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Battery Management |
| DS245 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Octal Bus Transceiver |
| DS2450 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1-Wire Quad A/D Converter |
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