SLLU336A May   2021  – January 2022 MCT8316A

 

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4.3.6 Stopping motor quickly

MCT8316A provides two options for applications that require stopping the motor quickly.

Option 1: Stopping motor quickly while spinning in closed loop.

Motor can be stopped by issuing 0% input speed duty cycle.

Step 1: Configure closed loop deceleration [CL_DEC] to a value that is same as closed loop acceleration [CL_ACC].

Step 2: Configure Motor stop option [MTR_STOP] to either High side or low side braking.

Step 3: Set the active spin brake threshold [ACT_SPIN_BRK_THR] to a value such that Overcurrent protection fault does not get triggered. Check GATE_DRIVER_FAULT_STATUS (register address: 0x000000E0) bit 28 for Overcurrent protection fault status.

Step 4: Configure Recirculation Brake time [RECIR_BRK_TIME] to a value such that motor is stopped completely. Recirculation brake time might be higher for motors with higher inertia.

Step 5: Enable Fast deceleration [FAST_DECEL_EN].

Note: Fast deceleration will be active till the input speed duty cycle decelerates to active spin brake threshold [ACT_SPIN_BRK_THR]. Device will engage High side or low side braking when the input speed duty cycle is below the active spin brake threshold [ACT_SPIN_BRK_THR].

Option 2: Stopping motor quickly during all stages of motor operation.

Step 1: Configure closed loop deceleration [CL_DEC] to a value that is same as closed loop acceleration [CL_ACC].

Step 2: Configure brake input [BRAKE_INPUT] to “Hardware pin brake” to apply brake using the BRAKE pin. Use Brake switch S1 in MCx8316AEVM to pull the BRAKE pin HIGH or LOW. MCT8316A applies brake when BRAKE pin is pulled HIGH. Configure brake input [BRAKE_INPUT] to “Overwrite Hardware pin with Active Brake” to apply brake using I2C.

Step 3: Set the brake duty threshold [BRAKE_DUTY_THRESHOLD] to a value such that Overcurrent protection fault does not get triggered. Check GATE_DRIVER_FAULT_STATUS (register address: 0x000000E0) bit 28 for Overcurrent protection fault status.

Step 4: Enable Fast deceleration [FAST_DECEL_EN].

Note: Fast deceleration will be active till the input speed duty cycle decelerates to brake duty threshold [BRAKE_DUTY_THRESHOLD]. Device will engage High side or low side braking when the input speed duty cycle is below the brake duty threshold [BRAKE_DUTY_THRESHOLD].