Digital ICs/DSP: Intelligent DC Motor-Control Chip Operates In Multiple Modes

Intelligent single-axis control for brushless dc motors is the driving force behind the MC3110 motor controller. The device operates in three modes: internal velocity profile mode, velocity mode with an external command signal, and torque mode with an external command signal. It provides software-programmable velocity and current loops, six-step and sinusoidal commutation, analog or digital command inputs, profile generation, and six-signal symmetric pulse-width-modulation waveform generation. It also can operate standalone using pre-programmed flash-stored parameters or a serial port interface with commands sent from a host. To implement a complete system, only three half-bridge switchers need to be tied to the chip. Housed in a 64-lead PQFP, the controller operates from a 3.3-V supply. Cost is $18 in OEM quantities.