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参数资料
| 型号： | DS2784G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/43页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STND-ALONE 14-TDFN |
| 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： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 2.5 V ~ 4.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x5） |
| 包装： | 带卷 (TR) |
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Figure 8, or it can be generated in software using the polynomial X + X + X + 1. Additional information about the
DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
CRC GENERATION
The DS2784 has an 8-bit CRC stored in the most significant byte of its 1-Wire net address. To ensure error-free
transmission of the address, the host system can compute a CRC value from the first 56 bits of the address and
compare it to the CRC from the DS2784.
The host system is responsible for verifying the CRC value and taking action as a result. The DS2784 does not
compare CRC values and does not prevent a command sequence from proceeding as a result of a CRC mismatch.
Proper use of the CRC can result in a communication channel with a very high level of integrity.
The CRC can be generated by the host using a circuit consisting of a shift register and XOR gates as shown in
8 5 4
Maxim 1-Wire CRC is available in Application Note 27: Understanding and Using Cyclic Redundancy Checks with
Maxim iButton Products .
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
INPUT
MSb
XOR
XOR
LSb
XOR
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 DS2784 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. A value of between 2k ? and 5k ? is
recommended. 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. Note that if the bus is left low for more
than t LOW0 , slave devices on the bus begin to interpret the low period as a reset pulse, effectively terminating the
transaction.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2784K | 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 |
| DS2786 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Standalone OCV-Based Fuel Gauge |
| DS2786_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786B | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786BEVKIT+ | 制造商:Maxim Integrated Products 功能描述:STANDALONE OCV-BASED FUEL GAUGE - Boxed Product (Development Kits) |
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