DRV8424: 高阻设定

还想请教一下  step  信号是1:1 方波吗？ 我从DEMO板测试的 不是1:1.   DIR 是1:1 方波；

1. EVM使用MSP430作为支持HiZ输出的主机控制器。

2. DIR引脚由GUI控制。 如果您没有更改DIR设置并看到1：1方波，那是因为测量了错误的引脚。是否可以提供需要测量设置的图片以显示板标签和测试点连接？

Are you using an EVM or a self-made board?

You can also communicate further with the product engineer in this post

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1002074/drv8424-setting-of-high-resistance/3704220#3704220

This is a little bit puzzling.  Is the motor changing direction that frequently?  Any time the direction pin is changed, motor will change direction.  With this squarewave on direction pin, it is changing quite frequently.  

For STEP input, please see section 6.6.  It is OK to not have a square wave on step.  You just need a 970ns LOW period followed by 970ns HIGH period to issue a step.  

Please let us know if there is any update here.  

是EVM

不用MCU  用硬件可以实现 高阻态设定吗？如何实现？比如悬空M0; 理论上应该2V 电压；实际用万用表；示波器都不能测试到。

是的，当浮动时，我希望 M0 引脚上有 ~2V。 您可以简单地让硬件中的引脚不连接来实现这一点。