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DRV2625: What different from DRV2605

Hirokazu Takahashi
Expert 8420 points
Part Number: DRV2625
Other Parts Discussed in Thread: DRV2605,

Dear Team,

I can find the differential points between DRV2625 and DRV2605 as below items.
* Auto-Braking with Open-Loop
* Sine-Wave Drive
* Overdrive Duration Clamp
* Simple Drive One-Wire Vibration Scheme
But, I couldn't understand about each items very well. Could you please let me know about more detail explanation.

If you have more information of advantage and disadvantage about the both products, please let me know it also.

Best Regards,
Hirokazu Takahashi

  • 0
    TI__Guru* 84915 points

    Hello, Takahashi-san,

    Effectively, these are some of the differences between the DRV2605 and DRV2625.

    - Auto-Braking with Open-Loop. The DRV2605 requires a close-loop in order to sample the back-EMF for automatic overdrive and braking. The auto-braking cannot be achieved during the open-loop. It requires to manually apply the necessary signal wave to break the actuator rotation. By other hand, the DRV2625 features a smart loop technology that allows the auto-braking. Figures 16 and 17 of datasheet can be used as examples to show the differences between a typical open loop braking (DRV2605) and braking with smart loop (DRV2625): http://www.ti.com/lit/ds/symlink/drv2625.pdf#page=11

    - Sine-Wave Drive. This feature only applies for the DRV2625 in open loop and LRA modes. This device offers the capability to select either sine-wave or square-wave waveform shape. It allows customizing the haptic feel as well as the audible performance.

    - Overdrive Duration Clamp. The DRV2625 allows the user to select the maximum time the overshoot will be allowed during the overdrive and braking periods. This parameter always uses automatic overdrive. It can be configured in 25ms, 50ms or 100ms.

    - Simple Drive One-Wire Vibration Scheme. The DRV2625 has a default configuration that can be used for LRA actuators. If the actuator is compatible with this default configuration, there's no need to use I2C interface. Instead, the SimpleDrive can be used with the actuator and control it through some pins such NRST or TRIG/INTZ (see interface selection section for details: http://www.ti.com/lit/ds/symlink/drv2625.pdf#page=63 ).

    In addition to these differences, the DRV2625 has an optional interrupt pin (NRST) that allows a full shutdown state for additional power savings.

    I hope this was clear. Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Expert 8420 points
    Hello Luis

    Thanks for your reaching out.
    I would like to know about more Auto-Braking with Open-Loop.
    I can find below description in DRV2605 datasheet page 11.
    "7.3.2.3 Automatic Overdrive and Braking
    A key feature of the DRV2605 is the smart-loop architecture which employs actuator feedback control for both ERMs and LRAs."

    Does DRV2605 have smart loop technology also? Is it supported at only closed loop in case of DRV2605?

    If we will use only closed loop, is the performance of break of DRV2605 as same as one of DRV2625?

    Why will DRV2625 support smart loop at open loop?

    Best Regards,
    Hirokazu Takahashi
  • 0 in reply to Hirokazu Takahashi
    TI__Guru* 84915 points
    Takahashi-san,

    Both devices support the smart-loop technology that allows to perform an automatic braking in closed-loop mode. However, the DRV2625 supports an enhanced version of this smart-loop architecture. In open-loop mode, it can switch to close-loop mode during the braking period. This will ensure to accomplish an automatic braking.

    The performance of both devices in closed-loop mode will be the same. However, in open-loop mode, the DRV2625 will have a better result and, consequently it will be more efficient.

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Expert 8420 points

    Hello Luis-san

    Thanks for your support

    Regards,

    Hirokazu Takahashi