ZHCSND1A November   2020  – May 2022 DRV8434

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1. 5.1 引脚功能
  6. 6 规格
    1. 6.1 绝对最大额定值
    2. 6.2 ESD 等级
    3. 6.3 建议运行条件
    4. 6.4 热性能信息
    5. 6.5 Electrical Characteristics
    6. 6.6 Indexer Timing Requirements
      1. 6.6.1 典型特性
  7. 7 详细说明
    1. 7.1 概述
    2. 7.2 功能模块图
    3. 7.3 特性说明
      1. 7.3.1  Stepper Motor Driver Current Ratings
        1. 7.3.1.1 峰值电流额定值
        2. 7.3.1.2 均方根电流额定值
        3. 7.3.1.3 Full-Scale Current Rating
      2. 7.3.2  PWM Motor Drivers
      3. 7.3.3  Microstepping Indexer
      4. 7.3.4  Controlling VREF with an MCU DAC
      5. 7.3.5  电流调节
      6. 7.3.6  Decay Modes
        1. 7.3.6.1 Slow Decay for Increasing and Decreasing Current
        2. 7.3.6.2 Slow Decay for Increasing Current, Mixed Decay for Decreasing Current
        3. 7.3.6.3 上升和下降电流阶段均为混合衰减
        4. 7.3.6.4 Smart tune Dynamic Decay
        5. 7.3.6.5 智能调优纹波控制
        6. 7.3.6.6 PWM 关断时间
        7. 7.3.6.7 消隐时间
      7. 7.3.7  电荷泵
      8. 7.3.8  线性稳压器
      9. 7.3.9  Logic Level, Tri-Level and Quad-Level Pin Diagrams
        1. 7.3.9.1 nFAULT 引脚
      10. 7.3.10 保护电路
        1. 7.3.10.1 VM 欠压锁定 (UVLO)
        2. 7.3.10.2 VCP 欠压锁定 (CPUV)
        3. 7.3.10.3 过流保护 (OCP)
          1. 7.3.10.3.1 锁存关断
          2. 7.3.10.3.2 自动重试
        4. 7.3.10.4 开路负载检测 (OL)
        5. 7.3.10.5 热关断 (OTSD)
          1. 7.3.10.5.1 锁存关断
          2. 7.3.10.5.2 自动重试
        6.       Fault Condition Summary
    4. 7.4 器件功能模式
      1. 7.4.1 睡眠模式 (nSLEEP = 0)
      2.      52
      3. 7.4.2 禁用模式（nSLEEP = 1，ENABLE = 0）
      4. 7.4.3 工作模式（nSLEEP = 1，ENABLE = Hi-Z/1）
      5. 7.4.4 nSLEEP 复位脉冲
      6.      功能模式汇总
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Stepper Motor Speed
        2. 8.2.2.2 电流调节
        3. 8.2.2.3 衰减模式
        4. 8.2.2.4 应用曲线
        5. 8.2.2.5 Thermal Application
          1. 8.2.2.5.1 Power Dissipation
          2. 8.2.2.5.2 Conduction Loss
          3. 8.2.2.5.3 Switching Loss
          4. 8.2.2.5.4 Power Dissipation Due to Quiescent Current
          5. 8.2.2.5.5 Total Power Dissipation
          6. 8.2.2.5.6 Device Junction Temperature Estimation
  9. 9 Power Supply Recommendations
    1. 9.1 大容量电容
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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

7.3.3 Microstepping Indexer

Built-in indexer logic in the device allows a number of different step modes. The M0 and M1 pins are used to configure the step mode as shown below. The settings can be changed on the fly.

Table 7-2 Microstepping Indexer Settings
M0 M1 STEP MODE
0

0

 Full step (2-phase excitation) with 100% current
0 330 kΩ to GND Full step (2-phase excitation) with 71% current
1 0 Non-circular 1/2 step
Hi-Z 0 1/2 step
0 1 1/4 step
1 1 1/8 step
Hi-Z 1 1/16 step
0 Hi-Z 1/32 step
Hi-Z 330kΩ to GND 1/64 step
Hi-Z Hi-Z 1/128 step
1 Hi-Z 1/256 step

Table 7-3 shows the relative current and step directions for full-step (71% current), 1/2 step, 1/4 step and 1/8 step operation. Higher microstepping resolutions follow the same pattern. The AOUT current is the sine of the electrical angle and the BOUT current is the cosine of the electrical angle. Positive current is defined as current flowing from the xOUT1 pin to the xOUT2 pin while driving.

At each rising edge of the STEP input the indexer advances to the next state in the table. The direction shown is with the DIR pin logic high. If the DIR pin is logic low, the sequence table is reversed.

Note:

If the step mode is changed dynamically while stepping, the indexer advances to the next valid state for the new step mode setting at the rising edge of STEP.

The initial excitation state is an electrical angle of 45°, corresponding to 71% of full-scale current in both coils. This state is entered immediately after power-up, after exiting logic undervoltage lockout, or after exiting sleep mode.

Table 7-3 Relative Current and Step Directions
1/8 STEP1/4 STEP1/2 STEPFULL STEP 71%AOUT CURRENT
(% FULL-SCALE)		BOUT CURRENT
(% FULL-SCALE)		ELECTRICAL ANGLE (DEGREES)
1110%100%0.00
220%98%11.25
3238%92%22.50
456%83%33.75
532171%71%45.00
683%56%56.25
7492%38%67.50
898%20%78.75
953100%0%90.00
1098%-20%101.25
11692%-38%112.50
1283%-56%123.75
1374271%-71%135.00
1456%-83%146.25
15838%-92%157.50
1620%-98%168.75
17950%-100%180.00
18-20%-98%191.25
1910-38%-92%202.50
20-56%-83%213.75
211163-71%-71%225.00
22-83%-56%236.25
2312-92%-38%247.50
24-98%-20%258.75
25137-100%0%270.00
26-98%20%281.25
2714-92%38%292.50
28-83%56%303.75
291584-71%71%315.00
30-56%83%326.25
3116-38%92%337.50
32-20%98%348.75

Table 7-4 shows the full step operation with 100% full-scale current. This stepping mode consumes more power than full-step mode with 71% current, but provides a higher torque at high motor RPM.

Table 7-4 Full Step with 100% Current
FULL STEP 100%AOUT CURRENT
(% FULL-SCALE)		BOUT CURRENT
(% FULL-SCALE)		ELECTRICAL ANGLE (DEGREES)
110010045
2100-100135
3-100-100225
4-100100315

Table 7-5 shows the noncircular 1/2–step operation. This stepping mode consumes more power than circular 1/2-step operation, but provides a higher torque at high motor RPM.

Table 7-5 Non-Circular 1/2-Stepping Current
NON-CIRCULAR 1/2-STEPAOUT CURRENT
(% FULL-SCALE)		BOUT CURRENT
(% FULL-SCALE)		ELECTRICAL ANGLE (DEGREES)
101000
210010045
3100090
4100–100135
50–100180
6–100–100225
7–1000270
8–100100315