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DRV8825EVM 开发手册 - TI（德州仪器）
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TI（德州仪器）
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开发套件
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Module
描述:
TEXAS INSTRUMENTS DRV8825EVM 评估模块, 用于DRV8825
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原理图在P5P10
应用领域在P17
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DRV8825EVM数据手册
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若手册格式错乱，请下载阅览PDF原文件
8 MicroSteps8 MicroSteps
1 Step1 Step
PHASE A
PHASE B
VREF A
VREF B
Current A
Current B
1 Step
1
2
3
The Micro Step
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Figure 2. Micro Step
Because the DRV8812 has the capability to regulate winding current, and said current is directly
proportional to the VREF input, it is possible to embed the prospective waveform at the current side.
Figure 3 shows the result of embedding said waveform into the winding current, which is the concept
behind this application note.
Figure 3. Embedded Waveform Into Winding Current
A microcontroller, such as the MSP430F1612 and utilizing GPIO outputs, will drive the DRV8812’s PHASE
inputs in the alternating fashion we saw on previous figures. However, and at the same time, the VREF
pins will be modulated by using the two DAC outputs to superimpose a sine wave crest.
As a result, the motor windings see a full sine wave of current being applied to them. Because the current
is segmented in smaller steps, the rotor also moves in smaller steps.
4
High Resolution Microstepping Driver With the DRV88xx Series SLVA416–September 2010
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