SLLU336A User guide

SLLU336A May 2021 – January 2022 MCT8316A

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3.2.1 Speed input mode

MCT8316A provides four options to configure the input speed command.

PWM input on SPEED pin by varying duty cycle of input signal
Frequency input on SPEED pin by varying frequency of input signal
Analog input on SPEED pin by varying amplitude of input signal
Over I²C by configuring SPEED_CTRL

Configure the speed input [SPD_CTRL_MODE] register to select the appropriate speed input mode.

If PWM input on SPEED pin is chosen as the speed input, configure SPD_PWM_RANGE_SELECT to select the PWM frequency range.

If Frequency input on SPEED pin is chosen as the speed input, configure INPUT_MAX_FREQUENCY to select the maximum PWM frequency. For example, if 10 kHz is chosen as maximum PWM frequency, 10 kHz PWM signal on SPEED pin will correspond to 100% speed command.

To command the speed via I²C, toggle the “Enable Speed Control via I²C” in the I²C Control Section in GUI.