DRV2605: Motor vibration to weak

Hi,

Could you provide your registers settings and the DRV2605 schematic portion, please? This is to have a better approach to the issue.

In addition, are you attaching the motor to a solid mass (> 100g)? Are you performing an auto-calibration before using the LRA? Or are you using the device in open-loop mode?

Any other information you could provide will be appreciated.

Best regards,
Luis Fernando Rodríguez S.

Hi Luis

1.  the mass is less than 100gr
2. we are woprking close loo
3. see attached files: 
   1. Reg.Status.after.configuration
   2. reg.status.after.playing.in.loop
   3. schematic design
      Fullscreen Reg.Status.while.playing.in.loop.txt Download

      While playing
      
      DRV2605Driver:Reg: 0x00 : Value:0x64
      DRV2605Driver:Reg: 0x01 : Value:0x00
      DRV2605Driver:Reg: 0x02 : Value:0x00
      DRV2605Driver:Reg: 0x03 : Value:0x06
      DRV2605Driver:Reg: 0x04 : Value:0x01
      DRV2605Driver:Reg: 0x05 : Value:0x01
      DRV2605Driver:Reg: 0x06 : Value:0x01
      DRV2605Driver:Reg: 0x07 : Value:0x01
      DRV2605Driver:Reg: 0x08 : Value:0x01
      DRV2605Driver:Reg: 0x09 : Value:0x01
      DRV2605Driver:Reg: 0x0A : Value:0x00
      DRV2605Driver:Reg: 0x0B : Value:0x00
      DRV2605Driver:Reg: 0x0C : Value:0x01
      DRV2605Driver:Reg: 0x0D : Value:0x00
      DRV2605Driver:Reg: 0x0E : Value:0x00
      DRV2605Driver:Reg: 0x0F : Value:0x00
      DRV2605Driver:Reg: 0x10 : Value:0x00
      DRV2605Driver:Reg: 0x11 : Value:0x05
      DRV2605Driver:Reg: 0x12 : Value:0x19
      DRV2605Driver:Reg: 0x13 : Value:0xFF
      DRV2605Driver:Reg: 0x14 : Value:0x19
      DRV2605Driver:Reg: 0x15 : Value:0xFF
      DRV2605Driver:Reg: 0x16 : Value:0x3F
      DRV2605Driver:Reg: 0x17 : Value:0x89
      DRV2605Driver:Reg: 0x18 : Value:0x0D
      DRV2605Driver:Reg: 0x19 : Value:0x6D
      DRV2605Driver:Reg: 0x1A : Value:0xB6
      DRV2605Driver:Reg: 0x1B : Value:0x93
      DRV2605Driver:Reg: 0x1C : Value:0xF5
      DRV2605Driver:Reg: 0x1D : Value:0xA0
      DRV2605Driver:Reg: 0x1E : Value:0x20
      DRV2605Driver:Reg: 0x21 : Value:0xE2
      DRV2605Driver:Reg: 0x22 : Value:0x18

DRV2605Driver:Reg: 0x00 : Value:0x60
DRV2605Driver:Reg: 0x01 : Value:0x00
DRV2605Driver:Reg: 0x02 : Value:0x00
DRV2605Driver:Reg: 0x03 : Value:0x06
DRV2605Driver:Reg: 0x04 : Value:0x01
DRV2605Driver:Reg: 0x05 : Value:0x01
DRV2605Driver:Reg: 0x06 : Value:0x01
DRV2605Driver:Reg: 0x07 : Value:0x01
DRV2605Driver:Reg: 0x08 : Value:0x01
DRV2605Driver:Reg: 0x09 : Value:0x01
DRV2605Driver:Reg: 0x0A : Value:0x00
DRV2605Driver:Reg: 0x0B : Value:0x00
DRV2605Driver:Reg: 0x0C : Value:0x00
DRV2605Driver:Reg: 0x0D : Value:0x00
DRV2605Driver:Reg: 0x0E : Value:0x00
DRV2605Driver:Reg: 0x0F : Value:0x00
DRV2605Driver:Reg: 0x10 : Value:0x00
DRV2605Driver:Reg: 0x11 : Value:0x05
DRV2605Driver:Reg: 0x12 : Value:0x19
DRV2605Driver:Reg: 0x13 : Value:0xFF
DRV2605Driver:Reg: 0x14 : Value:0x19
DRV2605Driver:Reg: 0x15 : Value:0xFF
DRV2605Driver:Reg: 0x16 : Value:0x3F
DRV2605Driver:Reg: 0x17 : Value:0x89
DRV2605Driver:Reg: 0x18 : Value:0x0D
DRV2605Driver:Reg: 0x19 : Value:0x6D
DRV2605Driver:Reg: 0x1A : Value:0xB6
DRV2605Driver:Reg: 0x1B : Value:0x93
DRV2605Driver:Reg: 0x1C : Value:0xF5
DRV2605Driver:Reg: 0x1D : Value:0xA0
DRV2605Driver:Reg: 0x1E : Value:0x20
DRV2605Driver:Reg: 0x21 : Value:0xE2
DRV2605Driver:Reg: 0x22 : Value:0x14

Hi Luis

Did you have the chance to look at the files?

Can you recommend a vibration motor which fit the driver?

Hi,

Excuse me, are you performing an auto-calibration before using the device? I see the Rated_Voltage and OD_Clamp registers in default state. Could you try increasing these values, please?

Unfortunately, we cannot suggest specific motors in this case. However, I can suggest to go to the recommended manufacturers in the website below:

http://www.ti.com/motor-drivers/actuator-drivers/actuators.html

Best regards,
Luis Fernando Rodríguez S.

I perform auto-clibration, but it didnt change the behavior, I will try to increaes the rated_voltage

Does the OD_clamp relevant if I work in close loop?

Thanks

Ido

Hi, Ido,

Yes, OD_CLAMP is necessary for both open-loop and closed-loop modes (RATED_VOLTAGE is also required in closed-loop mode). Basically, the RATED_VOLTAGE establish the voltage in steady-state. OD_CLAMP configures the overdrive voltage allowed for the actuator.

Please let me know if you have more observations on this.

Best regards,
Luis Fernando Rodríguez S. 

Hi Luis

I managed to opearate the motor, but the autocalibration does not always finished. 

I attached 3  reg values files:

1.  autocliab finished

2. autocliab fail

3. autocalib finished but fb_sts=1

sometime the motor vibrate strong and somtime weak with same code

Can you suggest what do I do next?

0x00 =0x60
0x01 =0x7
0x02 =0x0
0x03 =0x1
0x04 =0x1
0x05 =0x0
0x06 =0x0
0x07 =0x0
0x08 =0x0
0x09 =0x0
0x0A =0x0
0x0B =0x0
0x0C =0x0
0x0D =0x0
0x0E =0x0
0x0F =0x0
0x10 =0x0
0x11 =0x5
0x12 =0x19
0x13 =0x64
0x14 =0x19
0x15 =0xFF
0x16 =0x3E
0x17 =0x89
0x18 =0x7
0x19 =0x99
0x1A =0xB7
0x1B =0x93
0x1C =0xFA
0x1D =0xA0
0x1E =0x20
0x21 =0xEA
0x22 =0x3C

0x00 =0x64
0x01 =0x7
0x02 =0x0
0x03 =0x1
0x04 =0x1
0x05 =0x0
0x06 =0x0
0x07 =0x0
0x08 =0x0
0x09 =0x0
0x0A =0x0
0x0B =0x0
0x0C =0x0
0x0D =0x0
0x0E =0x0
0x0F =0x0
0x10 =0x0
0x11 =0x5
0x12 =0x19
0x13 =0x64
0x14 =0x19
0x15 =0xFF
0x16 =0x3E
0x17 =0x89
0x18 =0x6
0x19 =0x89
0x1A =0xB7
0x1B =0x93
0x1C =0xFA
0x1D =0xA0
0x1E =0x20
0x21 =0xED
0x22 =0x32

0x00 =0x6C
0x01 =0x7
0x02 =0x0
0x03 =0x1
0x04 =0x1
0x05 =0x0
0x06 =0x0
0x07 =0x0
0x08 =0x0
0x09 =0x0
0x0A =0x0
0x0B =0x0
0x0C =0x0
0x0D =0x0
0x0E =0x0
0x0F =0x0
0x10 =0x0
0x11 =0x5
0x12 =0x19
0x13 =0x64
0x14 =0x19
0x15 =0xFF
0x16 =0x3E
0x17 =0x89
0x18 =0x7
0x19 =0x99
0x1A =0xB7
0x1B =0x93
0x1C =0xFA
0x1D =0xA0
0x1E =0x20
0x21 =0xED
0x22 =0x2E

Hi Luis

Do you have any update for?

I managed to operate the motor on the DRV2605EVM-CT, I replaced ti with my motor and it vibrate very weak.

I changed the OD_clamp and rated voltage but it didnt help

I measure the motor+ and motor- with scope and it looks fine

Can you suggest what can be the problem?

Hi, Ido,

The motor intensity is only related to the OD_Clamp and Rated_voltage.

Have you tested the motor vibration with a different source? Just to confirm that it can vibrate at higher intensities.

Best regards, 
Luis Fernando Rodríguez S.

I tested with with AC DC power supply and it vibrates at 1.1V

Hi luis 

what is disadvantages to work with an open loop?

Hi, IdoOffice,

The open loop configuration allows the user setting the resonance frequency manually. However, in open loop mode, the automatic resonance tracking is not available. This mode cannot be used to track the back-EMF of the actuator. If the resonant frequency shifts in the middle of a waveform for any reason, the engine couldn't track the frequency and adjust it in open loop mode.

Best regards,
Luis Fernando Rodríguez S.

i tried few time to calibrate change the rated_voltage and od_clamp but nothing helps. sometime the calibration succeed but the motor does not vibrate.

it works only on open loop mode