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DRV8462EVM: DRV8462EVM missing documentation?

Edward Brakus
Prodigy 40 points
Part Number: DRV8462EVM
Other Parts Discussed in Thread: DRV8462

I'm working with the DRV8462EVM, have the user manual, schematics, BOM, SW and other documentation from the software download, but there is a lot of info missing and i'm wondering if I have overlooked a technical document, perhaps the data sheet for the EVM.  (I have the datasheet for the part, but not the EVM).

Examples of open questions;


1) What is the max input voltage VIN for the board?   The chip max is 70V but when I applied that, the board went up in smoke.

2) What is the specific terminal lead assignments for the A+/- and B+/- terminals for connecting a stepper motor (which are - and which are +)?

3) Can I drive the 8462 directly from my application circuit by removing the jumpers on J4 and/or J8, to disconnect the on-board MCU, and connect mine by jumper wires to the right-side jumpers?  Or is there a board design consideration that would prevent this from working?

4) Where can I find the definitions of the various test poiints.  I didn't see them all defined in the schematic.  Did I overlook somethig there?

If there is a document that answers these questions, please point me to it, otherwise if you could kindly answer the questions directly, it would be a big help.


Thanks and regards

  • +1
    TI__Mastermind 45465 points

    Hi Edward,

    Sorry to hear you're having problems with the DRV8462EVM and the EVM board got damaged. Thanks for contacting us. 

    1) The EVM is designed to support the maximum recommended operating voltage of the DRV8462 driver device. According to the device datasheet this is 65V. 70V is the absolute maximum voltage even slightly above which the device could be permanently damaged. Assuming you maintained the correct polarity of the power connector as described in the EVM User's Guide UG https://www.ti.com/lit/ug/slou558b/slou558b.pdf page-8, likely you may have damaged the driver device only by barely exceeding the absolute maximum of the device. You could order free samples from TI and rework the EVM with a new IC. In addition, if you could let me know your shipping details (or email to contact you) I can arrange for shipping a replacement EVM to you.

    2) This information is in the EVM UG Appendix A, pages 40-41.

    3) Yes this is the purpose of the two row headers with removable jumper shorts. It should work with an external MCU when isolated from the on-board MCU.

    4) All user accessible test points are labelled in the silk-screen. Unlabeled test points are meant for factory diagnostics only. In the case of the DRV8462 in addition to the power and GND test points the Torque Count test point is accessible by the user. The description about this test point is on page-18 of the EVM UG.

    If there are any other information you're looking for please let me know. Thank you.

    Regards, Murugavel

  • 0 in reply to Murugavel4637
    Prodigy 40 points

    Hi Murugavel

    Thank you for the helpful information.   I would welcome the replacement board and will email you my shipping address.


    Cheers

    -Ed

  • 0 in reply to Edward Brakus
    TI__Mastermind 45465 points

    Hi Edward,

    I was informed you can use the RMA process at where you procured the EVM such as TI eStore or a distributor and get a replacement EVM for the damaged EVM. Please use this. Thank you.

    Regards, Murugavel