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DRV8343-Q1: Unused pin

Manabu Ishida
Prodigy 110 points
Part Number: DRV8343-Q1
Other Parts Discussed in Thread: DRV8300

Hi Team

Please tell me about unused pin processing of DRV8343-Q1.
It has a circuit configuration in which one of the three half bridges is unused.

The datasheet contains the following information:
"If a half-bridge is not used, the gate pins (GHx and GLx) can stay unconnected and the sense pins (SHx and DLx) can be tied directly or with a resistor to GND."

However, the following description is in the past E2E.
1) INHx/INLx - tie to GND or float
2) Tie GHx to SHx
3) Tie DLx, GLx, and SLx together

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1075416/drv8343-q1-unused-inx-ilx-ghx-glx-shx-dlx-slx-pins

Which connection is better?

Please tell me if the data sheet references are different.

best regards
manabu

  • +1
    TI__Genius 12231 points

    Hi Manabu, 

    Thank you for your question. 

    While there are many ways to connect the pins of the driver's unused phase, I would recommend following the datasheet for this, as this method was specifically written with device in mind. I would also add to tie the INHx/INLx pins together and tie to GND. 

    The E2E method as linked above is also valid, but as a definitive statement I would refer to this E2E FAQ where this specific topic is addressed and includes a comprehensive list of pins and where to tie them when unused based on the DRV8300 architecture: e2e.ti.com/.../faq-quick-guide-to-debugging-common-issues-in-bldc-motor-drivers

    Hope this information has been helpful. 

    Best Regards,

    -Joshua