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参数资料
| 型号： | DS2740BU+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/16页 |
| 文件大小： | 304K |
| 描述： | IC CURRENT GAUGE(15BIT) 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 功能： | 电流计（13 位） |
| 输入电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
DS2740
The CRC can be generated by the host using a circuit consisting of a shift register and XOR gates as
shown in Figure 8, or it can be generated in software. Additional information about the Dallas 1-Wire
CRC is available in Application Note 27, Understanding and Using Cyclic Redundancy Checks with
Dallas Semiconductor i
Button Products. (This application note can be found on the Maxim/Dallas
Semiconductor website at www.maxim-ic.com.)
In the circuit in Figure 8, the shift register bits are initialized to 0. Then, starting with the least significant
bit of the family code, one bit at a time is shifted in. After the 8th bit of the family code has been entered,
then the serial number is entered. After the 48th bit of the serial number has been entered, the shift
register contains the CRC value.
Figure 8. 1-Wire CRC GENERATION BLOCK DIAGRAM
MSb
XOR
XOR
LSb
XOR
INPUT
HARDWARE CONFIGURATION
Because the 1-Wire bus has only a single line, it is important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must connect to the
bus with open-drain or tri-state output drivers. The DS2740 uses an open-drain output driver as part of the
bidirectional interface circuitry shown in Figure 9. If a bidirectional pin is not available on the bus master,
separate output and input pins can be connected together.
The 1-Wire bus must have a pullup resistor at the bus-master end of the bus. For short line lengths, the
value of this resistor should be approximately 5k? The idle state for the 1-Wire bus is high. If, for any
reason, a bus transaction must be suspended, the bus must be left in the idle state to properly resume the
transaction later. If the bus is left low for more than 120?/SPAN>s (16?/SPAN>s for overdrive speed), slave devices on
the bus begin to interpret the low period as a reset pulse, effectively terminating the transaction.
The DS2740 can operate in two communication speed modes, standard and overdrive. The speed mode is
determined by the input logic level of the OVD pin with a logic 0 selecting standard Speed and a logic 1
selecting overdrive speed. The OVD pin must be at a stable logic level of 0 or 1 before initializing a
transaction with a reset pulse. All 1-Wire devices on a multinode bus must operate at the same
communication speed for proper operation. 1-Wire timing for both standard and overdrive speeds are
listed in the Electrical Characteristics: 1-Wire Interface tables.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2740EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-PRECISION COULOMB COUNTER - Boxed Product (Development Kits) |
| DS2740K | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| DS2740U | 制造商:Maxim Integrated Products 功能描述:HI PRECISION COUL CNTR UMAX(USOP)-8 - Rail/Tube |
| DS2740U/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
| DS2740U/T | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
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