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DRV8343-Q1: Replacement for DRV8340-Q1?

Mitchell
Expert 4915 points
Part Number: DRV8343-Q1
Other Parts Discussed in Thread: DRV8340-Q1,

Hi Team,

My customer is wondering if the DRV8343S can be used as a drop in replacement for the DRV8340S. From the datasheet, both ICs are identical except for the current sense amplifiers present on the DRV8343S. Can these current sense amplifier pins be left floating?

-Mitchell

  • 0
    TI__Mastermind 23045 points

    Hello Mitchell,

    Thanks for posting to the MD forum! You can use DRV8343S as a drop in replacement, the only changes that need to be done to address the CSA pins are the following:

    1. SNx and SPx pins must be tied to ground

    2. SOx pins can be left floating

    3. VREF can either be left floating or grounded

    4. CAL can either be left floating or grounded

    The register map is almost identical but keep in mind there are some additional registers on the DRV8343S for the CSA settings, so please ensure that those are being handled appropriately. I hope this helps!

    Best,

    Isaac

  • 0 in reply to Isaac Lara
    Prodigy 20 points

    Hi Isaac,

    Thank you for reply and clarification for DRV8343S. I have couple more related questions:
    1. Do DRV8343 and DRV8340 have some Chip ID registers easy readable by SW to distinguish between these two chips? As you mentioned they have extra registers require SW handling.
    2.       For DRV8340 - can we tie NC-marked pins 11, 12, 13, 14, 25 and 26 to GND to get design compatibility between DRV8343 and DRV8340.

    Pin Number DRV8340 DRV8343
    11 NC SPA GND
    12 NC SNA GND
    13 NC SNB GND
    14 NC SPB GND
    25 NC SPC GND
    26 NC SNC GND
    27 NC SOC FLOAT
    28 NC SOB FLOAT
    29 NC SOA FLOAT
    30 NC VREF FLOAT
    37 NC CAL FLOAT

     Thank you!
    Best Regards, Michael Khitrov

  • 0 in reply to MICHAEL KHITROV
    TI__Mastermind 23045 points

    Hey Michael,

    No worries always glad to help out.

    1) This device does not have Device ID registers to distinguish between the two devices. But perhaps you might be able to read a bit that is reserved on the DRV8340-Q1 but is not reserved on the DRV8343-Q1 to be able to distinguish between the two? This will depend on  the digital logic on this device, so if a reserved bit or register is on DRV8340-Q1 is padded with 0s then you should be able to tell the difference if you use a register that has a value of 1 on reset for DRV8343-Q1 for example something like VREF_DIV or SEN_LVL_X registers are all defaulted to something that is not 0. Has the customer tried checking any of these reserved bits yet?

    2) Yes you can connect the NC pins on DRV8340-Q1 to GND the same way that you are handling them DRV8343-Q1 pins.

    Best,

    Isaac

  • 0 in reply to Isaac Lara
    Prodigy 20 points

    Thanks a lot! Have a Nice Weekend, Michael

  • 0 in reply to MICHAEL KHITROV
    TI__Mastermind 23045 points

    Thanks Michael! Have a nice weekend as well!

    Best,

    Isaac