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DRV8701: reasons for resistor connected to SH1 - unused H bridge

Lenio Cacula
Genius 16700 points
Part Number: DRV8701
Other Parts Discussed in Thread: DRV8702-Q1

The DRV8701 datasheet is very specific in recommending a 1/10 W, 330-Ω 5% resistor from SH1 to GND, section 7.3.2. What is the reason for that resistor and its value? Also, should I consider the same approach for other devices, such as the DRV8702 when using only one half bridge?

Thank you!

  • 0
    TI__Mastermind 37683 points

    Hi Lenio,

    Thank you for posting to the motor drivers forum.

    Please give us some time to research your questions. Expect a reply from us by 12/14 with answers to your questions.

  • 0 in reply to Pablo Armet
    TI__Mastermind 37683 points

    Hi Lenio,

    [Q1]: The DRV8701 datasheet is very specific in recommending a 1/10 W, 330-Ω 5% resistor from SH1 to GND, section 7.3.2. What is the reason for that resistor and its value?

    [A]: The resistor value is recommended by the designers to ensure the device operates properly while the device is in half-bridge operation mode. 

    [Q2]: Also, should I consider the same approach for other devices, such as the DRV8702 when using only one half bridge?


    [A]: In regards to the DRV8702, the approach is slightly different. The image below shows the block diagram for the DRV8702-Q1. The highlighted pins have to be modified to support half-bridge operation. GH2 is left open, SH2 is connected directly to GND pin, GL2 is left open, and SL2 is connected to SP pin. The active half-bridge will be the one connected to SH1, GH1, and GL1.