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Original question:

DRV8718-Q1: Register configuration

DRV8718-Q1: use DRV8718 -Q1 drive H bridge

Elec Cheng
Expert 7055 points
Part Number: DRV8718-Q1

Hi Expert,

I want to use DRV8718-Q1 to drive 4 H-bridge, and I want to use PWM control. Thus, from my understanding, I should config like this.

Take half bridge1 and 2 as example. We can only change direction via SPI. We can map IN1 as PMW signal for speed control. For forward direction, half bridge1 is set as Half-Bridge PWM Control, setting reg 0x09 bit6/7 as 11, reg 0x0D bit7 as 0, reg 0X0E bit7 as 0, reg 0x0b bit7/6 as 00. We also need to config half bridge2 as low side switch, setting reg 0x09 bit5/4 as 01. For the reverse direction, the similar config as for opposite gate. But we need to disable them first before enable opposite. 

Is there anything wrong with above configuration? Thanks.

BR,

Elec Cheng

  • 0
    TI__Expert 7055 points

    Hi Expert,

    I have another thoughts. To drive H-bridge with half-bridge1 and half-bridge2, I can set half-bridge1 as PWM High-Side and set half-bridge2 as PWM Low-Side. They are mapped to the same PWM input signal. If I want to drive reversely, then just switch the settings. 

    From your side, is it applicable? Do you have detailed config? Our customer need to fix design in two days. It's a quite urgent thing. Need you help here! Thanks.

    BR,

    Elec Cheng

  • 0 in reply to Elec Cheng
    TI__Guru 55605 points

    Elec,

    Your first suggestion is the correct one.  See example in datasheet.

    You would just flip settings for reverse.  HB2_CTRL = PWM and HB1_CTRL = L.  That will give you "slow decay" when the PWM input is LOW.  IN1 controls speed.

    Regards,

    Ryan