DRV8424: setting of high resistance

Hello, Annie,

1. EVM uses MSP430 as the host controller which support HiZ output.

2. DIR pin is controlled by the GUI. If they didn't change the DIR setting and see the 1:1 square wave, I would think they measured the wrong pin. Would you ask a picture of the measurement setting to show the board label and test point connection?

Regards,

Wang Li

Hi Wang Li,

Customers want to know if the MCU is not used, can the high-impedance setting be achieved by hardware? If so, how can it be achieved?

And he confirmed that he didn't measure the wrong pin.

Thanks,

Annie

Annie,

If the MCU is not used, leaving that pin float can set the high-impedance.

If he didn't measure the wrong pin, do they test it on an EVM? Can they take a picture to show the connection?

Regards,

Wang Li

Annie,

Do they test it on an EVM? 

Regards,

Wang

DRV8424EVM

Yuxiao,

How do you control DIR 1:1 square wave?

Regards,

Wang 

Annie,

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.  

Regards,

Ryan

Hi Ryan,

It is EVM. If MCU is not used, can high-impedance setting be realized by hardware? How to achieve? For example, floating M0; theoretically it should be 2V voltage; actually use a multimeter? It cannot be tested by oscilloscope.

Thanks,

Annie

Annie,

Today is a US holiday.  Expect a response by tomorrow.

Regards,

Ryan