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DRV2510Q1EVM: DRV2510Q1EVM

Part Number: DRV2510Q1EVM

Hi!

I'm using the DRV2510Q1 EVM to drive an electromagnet with a PWM on IN+ and a 3.3V level on IN- generated by an extern microcontroller. I read the register with the Haptics Control Console. 

The DRV2510Q1 turn in fault with the 6th bit of the status register high.

In the datasheet this bit is reserved and this error is not explained.

What is this error and how can I fixe it?

  • Hi Nicolas,

    I am looking into this issue and should have an answer by tomorrow. It seems that the haptic control console gives the description of that register even though it should be reserved. This DC offset protection should not be enabled on the DRV2510. This is why we removed the description of that bit in the datasheet.
  • Hi Kelly,

    Thank you for your reply.
    This protection is also enable in the DRV2510 because the output turn off and the driver goes in Diagnostic mode.

    Best regards
    Nicolas Roch
  • Hi Nicolas,

    I confirmed what you are seeing, and I'm working with my team to resolve the issue. Your test case will be using DC output for >700ms, correct.
  • Hi Kelly,

    I'm using a PWM at 12500 kHz on IN+ and a high level signal on IN-. I did some test today and it happened when I'm trying to have a duty cycle up to 50% on IN+.

    I don't use DC output, only PWM to drive my coil.

    Regards,

    Nicolas Roch

  • The DC protection threshold is 2.9V with a maximum response time of 700ms. So if you have a DC offset greater than ~2.9V between your outputs for 600-700ms, then the device protection will put the part in Hi-Z mode. Do you see this on your output?
  • I'm not in the labs now (it's 11pm there).
    When I watch my two outputs with a differential probe I have a triangular signal beetween GND and VCC with a periode of 80us. Tomorrow I will connect one probe on each outputs to see if one of them has a continous voltage for more than 700ms.

    I don't see a DC offset but I see that the outputs (with the differential probe) are low.

    Regards,
    Nicolas Roch
  • Hi Kelly,

    I did some test today.

    In the next screenshots blue is OUT-A and pink OUT-B.

    When I have a duty cycle lower than 50% (on IN+) the issue isn't happening but from 50% I have the DC offset protection enable.

    Here is a screenshot of my two outputs with a duty cycle of 10% and a PWM frequency of 12500Hz (screen_1). The signals are enable during the time I want. No DC offset protection occure in this case.

    If I zoom the signal (screen_2)

    Now I change the duty cycle to 50% (screen_3).

    We can see that the DC offset disabe the output when the signal is on during 650ms.

    I zoom the signal (screen_4)

    I don't understand why the DC offset protection is enable when I trie to set the duty cycle upper than 50%.

    Maybe this will help you to fixe this issue.

    Regards,

    Nicolas Roch

  • Hi Nicolas,

    The last two screen shots show the issue. The DC offset between the outputs is ~4.5V and then the protection kicks in at 650ms and shuts the device off.
    When the duty cycle is lower, the DC offset is <2.9V, and therefore the protection doesn't activate. The problem here is the DC protection is enabled. I will have a meeting to discuss this with my team next Tuesday and then I can update you with our solution.
  • Hi Kelly,

    Ok I understand now.

    Thank you for your help.

    I'm waiting for your feedback.

    Regards,

    Nicolas

  • Hi Nicolas,

    We will fix the datasheet to describe the DC Offset protection for the DRV2510. Please look into using the DRV2511Q1, which already has the DC protection disabled.
  • Hi Kelly,

    Ok thank you.

    I'll use the DRV2511.

    regards,

    Nicolas