DRV2625: Calibration failed

Stefano Sergi

Part Number: DRV2625
Other Parts Discussed in Thread: DRV2624, , DRV2605L

Tool/software:

Hi all,

I am trying to start the automatic calibration with the DRV2526 driver and my VLV221007E linear vibrating motor.

I followed the DRV2624 & DRV2625 Quick Start Guide to configure the device for auto-calibration, chapter 4.3 Auto-Calibration:

I entered the value 0x03 in the MODE field of register 0x07.
I entered the value 1 in the LRA_ERM field of register 0x08.
I used the DRV2624-2625_DESIGN_TOOL tool (www.ti.com/.../DRV2624-2625_DESIGN_TOOL) to calculate the values to be inserted in the Rated Votlage (0x1F) and OD Clamp (0x20) registers (90 and 114 respectively).
I entered the calculated value 17 in the DRIVE_TIME field of register 0x27.

At this point I start the calibration.
The calibration fails because checking the DIAG_RESULT bit it is set to 1.

Can someone help me understand what I'm doing wrong?

Also does anyone know if there are any libraries in c or c++ to use?

Thanks

18 days ago

0 Sydney Northcutt 18 days ago

TI__Genius 10360 points

Hello,

You are running calibration correctly, but unfortunately this LRA's acceleration is too large (8Grms) for our current LRA drivers capabilities. The device monitors the back-EMF of the LRA to calibrate and enable the smart features but for these larger LRAs the back-EMF is out of our devices sensing capabilities.

There is a note about this on the manufacturers product page for this LRA that specifically references DRV2605L, but the same is true for all of our current DRV26XX LRA drivers.

Regards,
Sydney Northcutt

0 Stefano Sergi 17 days ago in reply to Sydney Northcutt

Prodigy 40 points

Tank you Sydney,

I'll try a smaller LRA.

Regards

Stefano

0 Sydney Northcutt 17 days ago in reply to Stefano Sergi

TI__Genius 10360 points

Hello,

Sure no problem. Let us know if any further support is needed.

Regards,
Sydney Northcutt

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DRV2625: Calibration failed