SLLU336 User guide

SLLU336A May 2021 – January 2022 MCT8316A

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4.3.2 Unidirectional motor drive detecting backward spin

For applications that require spinning the motor in a specific direction, it is important to know if the motor is coasting or spinning in the direction opposite to the intended direction of spin. MCT8316A reverse drive function acts to reverse decelerate the motor through zero speed and to accelerate after changing direction until it transitions into closed loop as shown in Figure 4-1.

Figure 4-1 Reverse Drive Function

MCT8316A provides an option to apply brakes and stop the motor while the motor is coasting or spinning in reverse direction and then accelerate into closed loop after changing the direction.

In applications such as ceiling fans and pumps, it is required to spin the motor in specific direction for desired results. For such applications, it is recommended to follow the below recommendations.

Step 1: Enable ISD [ISD_EN]

Step 2: Enable Motor ISD Reverse drive [RVS_DR_EN]

Step 3: Enable reverse resynchronization [RESYNC_EN]