JAJSSJ5 December   2023 DRV8234

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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 I2C Timing Requirements
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Operating Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 External Components
      2. 7.3.2 Summary of Features
      3. 7.3.3 Bridge Control
      4. 7.3.4 Current Sense and Regulation (IPROPI)
        1. 7.3.4.1 Current Sensing
        2. 7.3.4.2 Current Regulation
          1. 7.3.4.2.1 Fixed Off-Time Current Regulation
          2. 7.3.4.2.2 Cycle-By-Cycle Current Regulation
      5. 7.3.5 Stall Detection
      6. 7.3.6 Ripple Counting
        1. 7.3.6.1 Ripple Counting Parameters
          1. 7.3.6.1.1  Motor Resistance Inverse
          2. 7.3.6.1.2  Motor Resistance Inverse Scale
          3. 7.3.6.1.3  KMC Scaling Factor
          4. 7.3.6.1.4  KMC
          5. 7.3.6.1.5  Filter Damping Constant
          6. 7.3.6.1.6  Filter Input Scaling Factor
          7. 7.3.6.1.7  Ripple Count Threshold
          8. 7.3.6.1.8  Ripple Count Threshold Scale
          9. 7.3.6.1.9  T_MECH_FLT
          10. 7.3.6.1.10 VSNS_SEL
          11. 7.3.6.1.11 Error Correction
            1. 7.3.6.1.11.1 EC_FALSE_PER
            2. 7.3.6.1.11.2 EC_MISS_PER
        2. 7.3.6.2 RC_OUT Output
        3. 7.3.6.3 Ripple Counting with nFAULT
      7. 7.3.7 Motor Voltage and Speed Regulation
        1. 7.3.7.1 Internal Bridge Control
        2. 7.3.7.2 Setting Speed/Voltage Regulation Parameters
          1. 7.3.7.2.1 Speed and Voltage Set
          2. 7.3.7.2.2 Speed Scaling Factor
        3. 7.3.7.3 Soft-Start and Soft-Stop
          1. 7.3.7.3.1 TINRUSH
      8. 7.3.8 Protection Circuits
        1. 7.3.8.1 Overcurrent Protection (OCP)
        2. 7.3.8.2 Thermal Shutdown (TSD)
        3. 7.3.8.3 VM Undervoltage Lockout (VM UVLO)
        4. 7.3.8.4 Overvoltage Protection (OVP)
        5. 7.3.8.5 nFAULT Output
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Low-Power Sleep Mode
      3. 7.4.3 Fault Mode
    5. 7.5 Programming
      1. 7.5.1 I2C Communication
        1. 7.5.1.1 I2C Write
        2. 7.5.1.2 I2C Read
    6. 7.6 Register Map
      1. 7.6.1 DRV8234_STATUS Registers
      2. 7.6.2 DRV8234_CONFIG Registers
      3. 7.6.3 DRV8234_CTRL Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application: Brushed DC Motor
      1. 8.2.1 Design Requirements
      2. 8.2.2 Stall Detection
        1. 8.2.2.1 Application Description
          1. 8.2.2.1.1 Stall Detection Timing
          2. 8.2.2.1.2 Hardware Stall Threshold Selection
      3. 8.2.3 Ripple Counting Application
        1. 8.2.3.1 Tuning Ripple Counting Parameters
          1. 8.2.3.1.1 Resistance Parameters
          2. 8.2.3.1.2 KMC and KMC_SCALE
            1. 8.2.3.1.2.1 Case I
            2. 8.2.3.1.2.2 Case II
              1. 8.2.3.1.2.2.1 Method 1: Tuning from Scratch
                1. 8.2.3.1.2.2.1.1 Tuning KMC_SCALE
                2. 8.2.3.1.2.2.1.2 Tuning KMC
              2. 8.2.3.1.2.2.2 Method 2: Using the Proportionality factor
                1. 8.2.3.1.2.2.2.1 Working Example
          3. 8.2.3.1.3 Advanced Parameters
            1. 8.2.3.1.3.1 Filter Constants
              1. 8.2.3.1.3.1.1 FLT_GAIN_SEL
              2. 8.2.3.1.3.1.2 FLT_K
            2. 8.2.3.1.3.2 T_MECH_FLT
            3. 8.2.3.1.3.3 VSNS_SEL
            4. 8.2.3.1.3.4 Additional Error Corrector Parameters
              1. 8.2.3.1.3.4.1 EC_FALSE_PER
              2. 8.2.3.1.3.4.2 EC_MISS_PER
      4. 8.2.4 Motor Voltage
      5. 8.2.5 Motor Current
      6. 8.2.6 Application Curves
  10. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
  11. 10Layout
    1. 10.1 Layout Guidelines
  12. 11Device and Documentation Support
    1. 11.1 ドキュメントの更新通知を受け取る方法
    2. 11.2 サポート・リソース
    3. 11.3 Trademarks
    4. 11.4 静電気放電に関する注意事項
    5. 11.5 用語集
  13. 12Revision History

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報
7.3.6.1.8 Ripple Count Threshold Scale

Denoted by RC_THR_SCALE, this is the scaling factor for the number of ripples for threshold. Settings are given below.

Table 7-14 Settings for RC_THR_SCALE
BitValue of RC_THR_SCALE
00b2
01b8
10b16
11b64

Depending on the number of ripples per revolution, NR, and the speed of rotations, RC_THR_SCALE can be chosen high or low based on user requirement of the nFAULT pin. If total number of ripple counts until the end of an operation cycle are low, choose a lower value of RC_THR_SCALE, otherwise a higher value is recommended.

Note:

Please note that RC_THR and RC_THR_SCALE do not affect the accuracy of ripple counting.