Part Number: DRV2605
I am trying to get a haptic feedback either using LRA motor with DRV2605, or using piezo with DRV2605/DRV2700 (based on application report SLOA255).
When using just LRA, the haptic feedback is barely noticeable. However, when the LRA is driven directly from a power supply, the feedback is strong.When using the DRV2700 with a signal from DRV2605, there is no feedback can be felt. I also notice that the FB pin does not output 1.3V. Thus my PVDD signal is around 10V instead of 65V.
Attached is the schematics of the haptic driver circuit. The selection between Piezo or LRA is done using J1 and J2 jumpers.
LRA motor - 1020-15-003-001 (www.digikey.ca/.../j2rmtd)Piezo - Z63000Z2910Z 1Z 2 (www.digikey.ca/.../j2rm8v)
I am looking for any possible recommendation.
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In reply to Ivan Salazar:
Thank you for your prompt reply.
For some reason, I thought that the motor is LRA type. I will update the registers and will test it as ERM motor.
Regarding DRV2700 I have a few questions:
In reply to Leonid Hrapunsky62:
I wanted to update you regarding the motor test. After changing the registers to drive the ERM motor, the performance of the motor immediately improved. We will continue playing with registers to get the best results.
I understand your point regarding REXT on the DRV2700 circuit. I will replace the resistor and will update you on the results.
Thank you again for continuing support.
Sorry for the delay in responding.
As mentioned in the above post DRV2605 works properly for us.
However, the DRV2700 still does not perform. I replaced REXT resistor to 10k. Unfortunately, it did not improve the performance. As soon as the EN pin is asserted high, the supply voltage drops from 5V to around 3.5V - 4V (board-dependent). Any suggestions? Troubleshooting steps?
All capacitors that are used for DRV2700 are 100nF, X7R, 20%, 50V (CGA2B3X7R1H104M050BD). I realize that C13 is below expected 68V boost voltage, but speaking with cap manufacturers, at 23 deg C, the capacitors can take significantly higher voltage than rated.
Anyway, if you believe that this might be an issue, please let me know and I will try to find a capacitor with a higher voltage rating.
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