ZHCSND1A November 2020 – May 2022 DRV8434
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 規格
- 7 詳細說明
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
- RGE|24
訂購信息
8.2.2.1 Stepper Motor Speed
The first step in configuring the DRV8434 requires the desired motor speed and microstepping level. If the target application requires a constant speed, then a square wave with frequency ?step must be applied to the STEP pin. If the target motor speed is too high, the motor does not spin. Make sure that the motor can support the target speed. Use Equation 1 to calculate ?step for a desired motor speed (v), microstepping level (nm), and motor full step angle (θstep)
The value of θstep can be found in the stepper motor data sheet, or written on the motor. For example, the motor in this application is required to rotate at 1.8°/step for a target of 18.75 rpm at 1/8 microstep mode. Using Equation 1, ?step can be calculated as 500 Hz.
The microstepping level is set by the M0 and M1 pins and can be any of the settings listed in Table 8-2. Higher microstepping results in a smoother motor motion and less audible noise, but requires a higher ?step to achieve the same motor speed.
| MODE0 | MODE1 | STEP MODE |
|---|---|---|
| 0 | 0 | Full step (2-phase excitation) with 100% current |
| 0 | 330k? 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 | 330k? to GND | 1/64 step |
| Hi-Z | Hi-Z | 1/128 step |
| 1 | Hi-Z | 1/256 step |