ZHCSG36D December   2016  – November 2017 TLV8541 , TLV8542 , TLV8544

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      低功耗 PIR 运动检测器
  4. 修订历史记录
  5. 说明 (续)
  6. Pin Configuration and Functions
    1.     Pin Functions: TLV8541 DBV
    2.     Pin Functions: TLV8542 D (X2QFN RUG Package Preview)
    3.     Pin Functions: TLV8544 PW (D SOIC Package Preview)
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
      1. 8.4.1 Rail-To-Rail Input
      2. 8.4.2 Supply Current Changes Over Common Mode
      3. 8.4.3 Design Optimization With Rail-To-Rail Input
      4. 8.4.4 Design Optimization for Nanopower Operation
      5. 8.4.5 Common-Mode Rejection
      6. 8.4.6 Output Stage
      7. 8.4.7 Driving Capacitive Load
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: Battery-Powered Wireless PIR Motion Detectors
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Calculation of the Cutoff Frequencies and Gain of Stage A:
        2. 9.2.2.2 Calculation of the Cutoff Frequencies and Gain of Stage B
        3. 9.2.2.3 Calculation of the Total Gain of Stages A and B
        4. 9.2.2.4 Window Comparator Stage
        5. 9.2.2.5 Reference Voltages
      3. 9.2.3 Application Curve
    3. 9.3 Typical Application: 60-Hz Twin T Notch Filter
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
      3. 9.3.3 Application Curve
    4. 9.4 Dos and Don'ts
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 器件支持
      1. 12.1.1 开发支持
    2. 12.2 文档支持
      1. 12.2.1 相关文档
    3. 12.3 相关链接
    4. 12.4 接收文档更新通知
    5. 12.5 社区资源
    6. 12.6 商标
    7. 12.7 静电放电警告
    8. 12.8 Glossary
  13. 13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

Reference Voltages

Referring to Figure 32, the divider networks comprising R7, R8, R9, and R10, generate the reference voltages VREF_High and VREF_Low of the window comparator. The center point of the divider provides the bias voltage of the gain in the stage B through the connection to the noninverting input of the amplifier.

Due to the very low bias current of the TLV8544 device, it is possible to use very large values of resistors in the divider networks to minimize the current to ground through the resistors to a negligible amount. For R7 = R8 = R9 = R10 = 15 MΩ:

Equation 8. TLV8544 TLV8542 TLV8541 eq_7Vref_High-eq.gif
Equation 9. TLV8544 TLV8542 TLV8541 eq_8-SNAA301.gif

Low leakage ceramic capacitors C7, and C8, maintain constant threshold voltages, preventing potential chatter at the output of the comparators. It should be noted that using cheap electrolytic capacitors must be avoided as they have high (many µA) leakage current. The comparator outputs stay low in the absence of motion across the sensor. In the presence of motion, comparators C and D generate high output pulses as shown in Figure 33. The order of the pulses depends on the direction of the motion in front of the sensor.