1. The stall detection function requires the use of intelligent tuning ripple control attenuation mode. On devices with stall detection function, this is the default attenuation mode.

    2.In order for stall detection to work properly, not only must the stall threshold be correctly defined, but the amplitude of the back electromotive force should also meet the SNR required for the stall detector to calculate the torque count. The higher the phase winding resistance of a stepper motor, the smaller the amplitude of the back electromotive force. Therefore, stepper motors with high winding resistance of about tens of ohms may not work well with stall detectors.

    3. Small size and/or low torque stepper motors may have weak permanent magnets and may not provide sufficient SNR (to generate back electromotive force), and may not work well with stall detectors.

    4.Under extremely low step rate conditions, the amplitude of the back electromotive force may not be sufficient to be within the detectable range of the stall detector. Under low step rate conditions, stall detection may not function properly. The minimum step rate that can be used for stall detection can be determined by evaluating different motors under various VM and current settings using device specific TI EVM.

    5. The stall threshold previously obtained at one speed may not be suitable for detecting stall at another speed. Every time you change the step speed, you must complete a new learning process.

    6.Similarly, manually entering a stall threshold at one speed may not be suitable for detecting stall at another speed. Every time the step speed changes, a new stall threshold must be entered.

    7.If implemented in applications, stall detection using stall threshold learning may not be reliable during the acceleration phase. In this case, the appropriate stall threshold must be manually set.

    8. The torque count calculation used for stall detection relies on observing the limited TOFF duration during each current regulation chopper cycle. If the voltage VM of the motor driving power supply is not sufficient to push enough current through the phase winding inductance to maintain voltage stabilization at a given step rate, not only will the current regulation function be lost, but stall detection will also not be effective. If the torque meter value suddenly jumps to an abnormally high value when the step speed increases, it indicates that the current regulation and stall detection capabilities have been lost at that speed. When the current regulation function is lost, the motor may or may not stall, depending on the inertia and acceleration curves of the system.t process.