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DRV8955: Do I have the keep the sleep signal always low during power on?

Jennifer Jordan
Intellectual 1076 points
Part Number: DRV8955

Hello, 

My customer is looking to evaluate the DRV8955 and has a question about the power on sequence for driving two of these devices. 

I read the post about connecting two drivers together and how to handle fault detection and if I understood correctly, it is important to handle the transients, especially during power on. During steady state instead we need to remember the body diodes of the bridges. Do you think it is necessary to keep the sleep signal always forced low during power on to be assured to not have any uncontrolled behavior? 

Thanks! 

Jennifer

  • 0
    TI__Mastermind 21600 points

    Hey Jennifer,

    You could, but it is not necessary.  I'm not sure what uncontrolled behavior you're concerned about.  As long as the control pins IN1-IN4 are LOW, then the device will not be outputting.  If there is a chance that these pins could be driven HIGH during power on then yes, I would recommend keeping nSLEEP low. 

    You might want nSLEEP control so that you can send the nSLEEP Reset Pulse to clear latched faults. If you already have a MCU pin for nSLEEP then I don't see a reason not to keep nSLEEP LOW on boot if you want, gives extra security.  

    Best,

    Jacob