70 MIPs in a 28-QFN — what that buys you
The Microchip DSPIC33EP256MC202-I/MM is a 16-bit digital signal controller from the dsPIC33EP family, packing 70 MIPs of deterministic execution into a 28-QFN-S package. The 21 I/O lines, Motor Control PWM peripheral, and DMA controller let you offload PWM updates and ADC reads from the core — the CPU stays free for the control law while the DMA handles the data movement.
Peripheral set and deployment context
The peripheral list includes a dedicated Motor Control PWM module, a quadrature encoder interface (QEI), and a 6-channel A/D converter with 10-bit or 12-bit resolution. These map directly to the signal chain of a three-phase BLDC or PMSM drive: the QEI reads rotor position, the PWM generates the switching pattern, and the ADC samples phase currents — all coordinated by the DMA without jitter from interrupt latency. Supply voltage is 3V to 3.6V, which aligns with a 3.3V rail common in mixed-signal designs.
For BOM planning, this is a single-source Microchip part without a direct pin-compatible second source from another vendor. The PIC24FJ256GA106-I/MR is a 16-bit PIC24 with the same Flash density but runs at 32 MHz and lacks the DSP engine and Motor Control PWM, so it is not a functional substitute for a dsPIC33EP design. If the application relies on the 70 MIPs and the PWM/DMA peripherals, this is the part the BOM stays with.