DRV2605: Waveform Library reference?

Kelly,

I have a similar problem to Cahlor's, since I need more information about the table in section 11.2. I am interested in the amplitude (or acceleration) vs. time that each waveform offers. Similar to what the "DRV2605 Setup Guide" offers in section 2.1 (I have attached an image of what I mean).

I am looking for this information because I am interested in creating a long waveform made out of the waveforms offered by the DRV2605. This long waveform needs to have specific characteristics, so the more knowledge I have about each individual waveform the more possible this job will be.

I understand the acceleration vs. time for each waveform changes for all haptic devices used; however, any guidance at this point is greatly appreciated.

Finally, I am also looking for a way to test the vibration of the haptic devices I have. I was wondering if there is a test rig that can be purchased at TI, or if you could give me any guidance on this aspect.

P.S. Feel free to let me know if you want me to start a new thread or if it is OK to continue on this one.

Sincerely,

Camilo Giraldo

Hi Camilo,

I can share waveform images via email. However, for your case, you may want to explore using RTP mode. This will give you the ability to control the output magnitude on the fly. Will you also change the frequency? Or will you be using the part in closed-loop mode?
The waveforms will be based on a specific motor, so the rise and fall times will be different as you mention above.

For testing the acceleration, we recommend using an accelerometer like the DRV-ACC16-EVM. We made this EVM in order to help cusomers with acceleration testing. The LRA should be taped down to a mass that is decently heavy (~50 grams or more). We use 100 gram rectangular metal blocks in order to standardize the acceleration based on weight. The mass should be placed on either gel blocks (like silicon) or foam in order to isolate the vibrations from the table /lab bench.

Kelly,

Thanks so much for the reply. I am planning on also exploring the RTP mode of the DRV2605 driver; however, I am trying to learn about the ERM's I have using the predefined libraries. Therefore, is it OK if you email me the information about the waveforms? My email is c318g339@ku.edu.

In regards to the frequency, I am not planning in changing the frequency independently to the amplitude. As I understand, ERM's don't allow me to control their frequency and amplitude independently from each other.

Finally, thanks for the link to the DRV-ACC16-EVM. I will take a look of it and let you know if I have any questions.

Sincerely,

Camilo Giraldo

Kelly,

The reason for this post is to follow up with the waveform images that the DRV2605 offers. I have not received an email from TI, and I just wanted to let you know.

I apologize if you are working on this already.

Sincerely.

Camilo Giraldo

Hi Camilo,

Sorry for the delay. I've sent over an email. I was thinking LRA, not ERM before so you can disregard that comment about frequency.