In the datasheet of DRV8889, is it open loop that it derive the current flow from external stepper motor in micro-stepping mode?
Is it using current sense to get the current value?
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In the datasheet of DRV8889, is it open loop that it derive the current flow from external stepper motor in micro-stepping mode?
Is it using current sense to get the current value?
Thanks for you reply.
I also have some question for it.
1)How the host controller know the stepper motor location? Can we use spi to read some register to get it ?
As you know if we only send the command to driver IC, we don't know whether it is correct.
2)What is the accuracy for it? (360 degrees should be divided into at least 360 equal parts?) Is it 1.8degree /step ?
3) How to interact with Software, such as sending IRQ to us every 128 steps or othres?
Hello,
1. DRV8889 doesn't report the stepper motor location. The host controller needs to add extra circuit to sense the stepper motor location.
2. First check the motor spec. If the motor is 1.8 degree/Full step. The motor move 1.8 degree/step. With micro-step setting, the winding current regulation accuracy can use datasheet spec to estimate. The position accuracy is a motor's spec.
3. What is IRQ?