Other Parts Discussed in Thread: DRV8323
Hi there, we are using the DRV8316 for FOC control of a BLDC motor and had the following questions!
1. We are not using the internal buck regulator for any application - what do we do with it in the meantime? We want to minimize component count.
2. We are considering 3x PWM mode - are there any disadvantages with this mode compared to 6x PWM?
3. What is the intended use of DRVOFF? I cannot think of a case where we want all FETs off and the driver is in sleep mode. If it's not being used, should I tie it to nSLEEP? Leave floating?
4. How is the VREF/ILIM pin to be used? Can it be tied directly to AVDD? Based on 8.3.11.1, I would assume yes. What would be the current limit in this case?
5. Does SDO need an external pullup? Figure 8-1 and section 8.3.10.4 shows it being push-pull but the datasheet mentions that it is open-drain? If push-pull, we will use an internal PU on our STM. If open-drain, we will connect to 3V3 through 4.7k.
6. I see that the datasheet mentions an analog ground and power ground. In the past, we have treated power ground as our system ground and created isolated analog pours for circuits of interest. In this case, for thermal reasons, we would want to connect the thermal pad to power ground. Thoughts?
Thank you,
Daniel
Daniel