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DRV8256: Support for 3.3V Logic Levels

Ken Condon
Prodigy 10 points
Part Number: DRV8256
Other Parts Discussed in Thread: , DRV8424

Hello, 

The datasheet mentions that 3.3V logic levels are supported but I don't see any mention of how to support those logic levels. The datasheet says the Vih ranges from 1.5V to 5.5V so I'm assuming that value is dependent on an external reference rail somehow. 

The DRV8256EEVM dev board looks like it ties an MSP430 3.3V logic signal directly to the EN pins and other logic level pins and there doesn't seem to be anything providing an external rail to the chip. However, the eval board uses a DRV8424 with software and hardware configurations to emulate operation of a DRV8256 so I'm not sure if that's a reliable source. 

What should I do to ensure that I can drive the PH and EN pins with 3.3V logic levels? 

VM in my application is 12V. 

Thanks,
Ken

  • 0
    TI__Mastermind 37683 points

    Hi Ken,

    Ken Condon said:
    What should I do to ensure that I can drive the PH and EN pins with 3.3V logic levels? 

    The DRV8256 can support logic level inputs of 3.3V. This is what it means in the datasheet. As long as the input voltage is between 1.5V and 5.5V, the driver will register a logic high input. 

    Regards,

    Pablo Armet