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DRV8838: Do I need Protect "MCU IC" PWM Output Pin ?

Wing Wing
Prodigy 170 points
Part Number: DRV8838

Hello:
I want to use CC2652 generate PWM to control "DRV8838 H-Bridge Driver" and I noticed document about layout don't have protection circuit.

My question, if i want to do it right, do I need add some Protect for CC2652 PWM Output ?

Thanks!

eg... add 2 x Schottky diodes to Gate? 
document https://www.ti.com/lit/ml/slua618a/slua618a.pdf

  • 0
    Prodigy 170 points


    One More question, what is the difference between  " 0 " and " X "?
    Forgive me for  a beginner :-)

    Thanks!

  • 0 in reply to Wing Wing
    TI__Mastermind 37683 points

    Hi Wing,

    [Q] My question, if i want to do it right, do I need add some Protect for CC2652 PWM Output ?

    [A] Before adding any protection, I suggest reading the datasheet of the CC2652 if it has any integrated protection features. Some of these controller have integrated protections against over voltage, ESD, etc. If this controller does not have such protection features, then I suggest adding clamping diodes such as TVS on the pins interacting with the driver to protect against potential voltage surges. However, in most cases, this might not be necessary since the control signals (IN1 and IN2) are very low voltage. If you expect voltage transients or possible ESD surges in your system or just want to be extra cautious, then I suggest adding a diode to clamp the voltage and absorb any excess energy to protect the controller.

    [Q] add 2 x Schottky diodes to Gate?

    [A] The DRV8838 integrates the H-bridge FETs so it is not possible to add the diodes to the FET gates.

    [Q] what is the difference between  " 0 " and " X "?

    [A] "0" means logic low (0 volts) and "X" means don't care (can be either logic "1" or "0").

    In regards to protection for the driver, the DRV8838 already has integrated circuitry that protects against over-current, high-temperature, and VCC under-voltage.