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Original question:

DRV2667: Non-symmetric signals

DRV2667: How to create Non-symmetric signals

Liu Yang
Expert 5915 points
Part Number: DRV2667

Hi Team,

I want to control a capacitive load with the DRV2667.
Is it possible to create non-symmetric signals like sawtooth or rectangle profiles?

The DRV2667 has two options to create the output signals. PWM input signal or Waveform Synthesizer.
The PWM seems to be more appropriate. But the problem I still see is that the two output channels cannot be controlled independently. That means I cannot create a sawtooth signal with changing halfwaves like in the attached schema (positive, negative positive,...). Is that right?

4666.Signals.pdf

Beat Regards,
Tom Liu

  • 0
    TI__Guru* 84915 points

    Hi, Liu,

    The DRV2667 is limited to work with PWM format. Both outputs cannot be controlled independently. However, have you tried to send a sawtooth form from a microcontroller in PWM format? Or could you try with a triangle waveform in first place? I see hard to create a rectangle profile since we don't recommend to use this device to handle DC voltages. However, we should get at least an approached sawtooth if it is sent in PWM format to the device.

    Please let me know if this makes sense and if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.