ZHCSHJ5 December   2018 DRV5021

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用电路原理图
      2.      磁响应
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Magnetic Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Field Direction Definition
      2. 7.3.2 Device Output
      3. 7.3.3 Power-On Time
      4. 7.3.4 Hall Element Location
      5. 7.3.5 Propagation Delay
      6. 7.3.6 Output Stage
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Proximity Sensing Circuit
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Configuration Example
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Alternative Two-Wire Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 文档支持
      1. 11.1.1 相关文档
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 术语表
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.3.5 Propagation Delay

The DRV5021 samples the Hall element at a nominal sampling period of 16.67 µs to detect the presence of a magnetic north or south pole. At each sampling point, the device takes the average of the current sampled value and immediately preceding sampled value of the magnetic field. If this average value crosses the BOP or BRP threshold, the device output changes according to the transfer function.

Figure 18 shows the DRV5021 propagation delay analysis in the proximity of a magnetic south pole. The Hall element of the DRV5021 experiences an increasing magnetic field as the magnetic south pole approaches near the device. At time t2, the average magnetic field is (B2 + B1) / 2, which is less than the BOP threshold of the device. At time t3, the actual magnetic field has crossed the BOP threshold. However, the average (B3 + B2) / 2 is still less than the BOP threshold. Thus, the device waits for next sample time, t4, to start the output transition through the analog signal chain. The propagation delay, td, is measured as the delay from the time the magnetic field crosses the BOP threshold to the time output transitions.

DRV5021 drv5021-propagation-delay.gifFigure 18. Propagation Delay