DSPIC33EP512MC502-I/SO - 70 MIPS Motor Control DSC, 512KB Flash | Microchip
MPN: DSPIC33EP512MC502-I/SO ✓ ActiveDSPIC33EP512MC502-I/SO Overview
A digital signal controller combines the compute architecture of a microcontroller with the DSP engine of a digital signal processor in a single chip. In the power-management hierarchy, DSCs sit above general-purpose MCUs for control-loop-intensive work such as field-oriented control (FOC) of motors, where multiply-accumulate operations must complete within a single PWM period. The dsPIC33EP family integrates the CPU, DSP engine, PWM peripherals, ADC and communications blocks on one die, eliminating external signal-processing components.
Key features include dual 3-wire MCPWM modules with complementary, edge-aligned and center-aligned modes, a 10-bit, 1.1 Msps ADC with up to 10 channels, two on-chip operational amplifiers and comparators supporting current-sensing loops, plus CAN 2.0B, two UARTs, two SPI and two I2C ports. Four DMA channels and five 16-bit timers offload the CPU. Hardware Quadrature Encoder Interface (QEI) simplifies servo feedback, and the PTG (Pulse Train Generator) automates simple sequences without CPU intervention.
Architecturally, the 16-bit pipelined core executes most instructions in one cycle, with a DSP engine providing single-cycle MAC and 40-bit accumulators. Pin-compatible peripheral remapping (PPS) lets designers route RPn functions to flexible I/O, easing PCB layout.
Typical applications include brushless DC (BLDC) and permanent-magnet synchronous motor (PMSM) drives, power factor correction, digital UPS systems, and servo/stepper control in industrial automation.
Design consideration: the core is powered internally from a VCAP/VDDCORE pin that requires an external low-ESR capacitor (approximately 10 uF with a 0.1 uF in parallel); supply voltage must stay within 3.0V to 3.6V.
This page synthesizes verified distributor pricing, drop-in same-footprint alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP512MC502-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with DSPIC33EP512MC502-I/SO (same form factor and footprint) — differing in Core Architecture, Package, Communication Interfaces, Flash Program Memory, Operating Temperature.
DSPIC33EP512MC502-H/SO
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33EP256MC502-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128MC502-I/SO
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →DSPIC33EP64MC502-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP32MC202-I/SO
✅ Drop-InContact for price
View Datasheet →DSPIC33EP512MC502-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit dsPIC DSC |
| Maximum CPU Speed | 70 MIPS (60 MHz) |
| Flash Program Memory | 512 KB (170K x 24) |
| RAM | 48 KB |
| Supply Voltage Range | 3.0 V to 3.6 V (nominal 3.3 V) |
| Operating Temperature | -40C to +85C |
| Package | 28-SOIC (0.295 in, 7.50 mm width) |
| PWM Peripherals | MCPWM (motor control PWM) |
| ADC Resolution / Speed | 10-bit, 1.1 Msps |
| Communication Interfaces | CAN 2.0B, 2x UART, 2x SPI, 2x I2C |
| On-chip Analog | 2x Op Amps, 2x Comparators |
| DMA Channels | 4 |
| Timers | 5 x 16-bit |
| Quadrature Encoder Interface | Yes (QEI) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| In-Circuit Serial Programming | ICSP (2-wire, PGECx/PGEDx pairs) |
DSPIC33EP512MC502-I/SO Pin Configuration
| Pin 1 | MCLR — Master clear reset (active low), programming voltage input |
| Pin 2 | AN0/VREF+/CN3/RB0 — Analog input 0 / ADC positive reference / change notification / port B0 |
| Pin 3 | AN1/VREF-/CN2/RB1 — Analog input 1 / ADC negative reference / change notification / port B1 |
| Pin 4 | PGED1/AN2/C1IN-/RP0/CN4/RB2 — ICSP data 1 / analog input 2 / comparator 1 input / remappable pin RP0 |
| Pin 5 | PGEC1/AN3/C1IN+/RP1/CN5/RB3 — ICSP clock 1 / analog input 3 / comparator 1 input / remappable pin RP1 |
| Pin 6 | PGD/AN4/C2IN-/RP2/CN6/RB4 — ICSP data / analog input 4 / comparator 2 input / remappable pin RP2 |
| Pin 7 | PGC/AN5/C2IN+/RP3/CN7/RB5 — ICSP clock / analog input 5 / comparator 2 input / remappable pin RP3 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/CN0/RC12 — Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKO/RC15 — Oscillator crystal output / clock output |
| Pin 11 | EMUD1/RP40/T2CK/CN1/RC1 — Emulation data 1 / remappable pin RP40 / Timer 2 external clock |
| Pin 12 | EMUC1/RP41/T1CK/RC0 — Emulation clock 1 / remappable pin RP41 / Timer 1 external clock |
| Pin 13 | VDD — Positive supply, 3.0 V to 3.6 V |
| Pin 14 | AN9/RP44/C3IN1-/RC6 — Analog input 9 / remappable pin RP44 / comparator 3 input 1 |
| Pin 15 | AN10/RP45/C3IN2-/RC7 — Analog input 10 / remappable pin RP45 / comparator 3 input 2 |
| Pin 16 | RP68/C1OUT/C2OUT/AN11/RC8 — Remappable pin RP68 / comparator outputs / analog input 11 |
| Pin 17 | RP69/C3OUT/PMA0/AN12/RC9 — Remappable pin RP69 / comparator 3 output / parallel master address 0 / analog input 12 |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VCAP/VDDCORE — Internal core regulator output - requires external low-ESR capacitor, do not load |
| Pin 20 | PGD3/RP46/RTCC/AN13/RB10 — ICSP data 3 / remappable pin RP46 / RTCC output / analog input 13 |
| Pin 21 | PGC3/RP47/PMA2/AN14/RB11 — ICSP clock 3 / remappable pin RP47 / parallel master address 2 / analog input 14 |
| Pin 22 | AN15/CTED2/PMA1/RP48/RB12 — Analog input 15 / current-time edge detect 2 / remappable pin RP48 |
| Pin 23 | CTED1/AN14/PMA3/RP49/RB13 — Current-time edge detect 1 / analog input 14 / remappable pin RP49 |
| Pin 24 | PGEC2/RP50/SOSCI/T2CK/CN1/RB14 — ICSP clock 2 / remappable pin RP50 / secondary oscillator input / Timer 2 clock |
| Pin 25 | PGED2/RP51/SOSCO/T1CK/CN0/PMA4/RB15 — ICSP data 2 / remappable pin RP51 / secondary oscillator output / Timer 1 clock |
| Pin 26 | AVDD — Analog positive supply - decouple with 0.1 uF to AVSS |
| Pin 27 | AVSS — Analog ground |
| Pin 28 | VDD — Positive supply, 3.0 V to 3.6 V |
Typical Applications
DSPIC33EP512MC502-I/SO is suitable for 6 applications: BLDC / PMSM Motor Control, Digital Power Conversion, Industrial Automation and CAN Networking, Servo and Stepper Motion Control, Embedded Audio and Signal Processing Nodes, Battery-Powered Portable Instruments.
BLDC / PMSM Motor Control
The DSPIC33EP512MC502-I/SO is purpose-built for field-oriented control (FOC) of brushless DC and permanent-magnet synchronous motors. Its MCPWM module generates complementary six-step or SVPWM outputs with programmable dead-time, while the 10-bit, 1.1 Msps ADC samples phase currents synchronously with the PWM carrier. The two on-chip op amps amplify low-side shunt signals and the analog comparators provide hardware cycle-by-cycle overcurrent limiting without CPU latency, protecting the inverter during faults. The hardware QEI interface decodes incremental encoder feedback for closed-loop speed/position control. Running FOC at a 10 kHz current loop consumes only a fraction of the 70 MIPS budget, leaving headroom for communication and supervisory logic on the same chip.
Recommended
Digital Power Conversion
In switch-mode power supplies, PFC stages, and digital UPS systems, the DSPIC33EP512MC502-I/SO closes voltage and current loops with sub-cycle PWM updates. The MCPWM's center-aligned mode minimizes input-current ripple in PFC topologies, and its 1.1 Msps ADC enables average-current-mode control with per-cycle regulation. The 70 MIPS DSP engine executes proportional-integral compensators and notch filtering for plants with narrow phase margin. On-chip comparators implement peak-current limiting in hardware, guaranteeing protection even if firmware stalls. Flash self-programming supports in-field parameter tuning over CAN 2.0B or UART, useful for power-system commissioning. The 3.0-3.6V single-supply operation simplifies bias derivation from auxiliary converter rails.
Recommended
Industrial Automation and CAN Networking
Factory nodes, servo drivers, and PLC I/O modules benefit from the DSPIC33EP512MC502-I/SO's integrated CAN 2.0B controller with up to 1 Mbit/s operation, which requires only an external transceiver such as the MCP2551. Dual UART, SPI and I2C ports allow simultaneous gateway operation between fieldbuses and local sensors. The Pulse Train Generator (PTG) automates simple I/O sequences and stepper pulse generation without CPU intervention, while four DMA channels stream ADC results to RAM. Five 16-bit timers support multi-axis time bases. The -40C to +85C industrial grade matches panel-mounted enclosure environments, and the 28-SOIC footprint keeps drive-node PCBs compact while 512 KB Flash stores multiple control profiles and parameter sets.
Recommended
Servo and Stepper Motion Control
For closed-loop servo amplifiers and stepper drivers, the DSPIC33EP512MC502-I/SO combines the hardware Quadrature Encoder Interface with 70 MIPS of DSP capacity for position/velocity/current cascaded loops. The QEI counts quadrature edges in hardware up to high encoder rates, and the MCPWM outputs either complementary H-bridge signals for DC servos or microstepping waveforms for steppers. Remappable peripheral pins (PPS) let designers route PWM and encoder signals to the most convenient package pins in the 28-SOIC footprint. The on-chip op amps condition current-shunt feedback, and the RTCC on pin 20 provides timestamped motion logging. Typical deployments include pick-and-place axes, lab automation stages, and small CNC spindles.
Recommended
Embedded Audio and Signal Processing Nodes
The dsPIC33EP DSP engine performs single-cycle multiply-accumulate operations with two 40-bit accumulators, making the DSPIC33EP512MC502-I/SO effective for embedded signal processing: active filtering, sensor fusion, tone generation, and acoustic analysis. Dual SPI ports interface audio codecs and high-speed ADCs while a UART streams processed results to a host. With 48 KB RAM, FIR/IIR filter sets and moderate FFT buffers fit on-chip without external memory. Deterministic 70 MIPS execution simplifies real-time guarantees compared with cache-based higher-end processors. The 3.3V I/O levels connect directly to common codec families, and the 28-SOIC package supports compact mixed-signal boards where the on-chip op amps can also serve as anti-aliasing gain stages.
Recommended
Battery-Powered Portable Instruments
Handheld diagnostics, measurement probes, and portable controllers use the DSPIC33EP512MC502-I/SO for its balance of DSP compute and low standby behavior. Idle and Doze modes scale core clock down while retaining peripheral operation, and the Watchdog plus Deep Sleep modes minimize average current in duty-cycled designs. The 10-bit ADC with multiple channels reads battery voltage, temperature, and sensor inputs; the RTCC provides real-time stamping. Single-supply 3.0-3.6V operation maps directly to one Li-ion cell via a small LDO. The 512 KB Flash holds rich UI, calibration, and logging firmware, while the 28-SOIC's surface-mount footprint and industrial temperature range suit ruggedized handheld enclosures used in field service and HVAC commissioning.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP512MC502-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP512MC502-H/SO | DSPIC33EP256MC502-I/SO | DSPIC33EP128MC502-I/SO | DSPIC33EP64MC502-I/SO | DSPIC33EP32MC202-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (7.50 mm) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Speed | 70 MIPS (60 MHz) | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| Flash Memory | 512 KB | 512 KB | 256 KB | 128 KB | 64 KB | 32 KB |
| RAM | 48 KB | 48 KB | 48 KB | 32 KB | 16 KB | 4 KB |
| CAN 2.0B | Yes | Yes | Yes | Yes | Yes | No |
| On-chip Op Amps / Comparators | 2 / 2 (3 total cmp inputs) | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | None |
| Supply Voltage / Temperature | 3.0-3.6 V / -40C to +85C (I-grade) | 3.0-3.6 V / H-grade bin | 3.0-3.6 V / -40C to +85C | 3.0-3.6 V / -40C to +85C | 3.0-3.6 V / -40C to +85C | 3.0-3.6 V / -40C to +85C |
Key Differentiators
- Maximum Flash capacity in the 28-SOIC MC502 family (vs DSPIC33EP256MC502-I/SO)
- Full motor-control peripheral set preserved at top memory tier (vs DSPIC33EP32MC202-I/SO)
- Alternative speed/temperature bin on identical silicon (vs DSPIC33EP512MC502-H/SO)
Design Notes
The internal core regulator is decoupled only through the VCAP/VDDCORE pin (pin 19). Place a low-ESR 10 uF ceramic capacitor with a 0.1 uF in parallel directly at this pin; the pin must not drive any external load. An unstable VCAP node can cause Flash write failures and spurious resets. Decouple both VDD pins (13, 28) with 0.1 uF and AVDD (26) with 0.1 uF plus an optional ferrite from the digital 3.3V rail to preserve ADC accuracy.
Keep the motor-control PWM outputs (MCPWM, remappable via PPS to RPn pins) short and symmetric to the gate drivers, and route the phase-current shunt feedback to the on-chip op-amp inputs (C1IN+/C1IN-/C2IN+/C2IN- on pins 4-7) as a Kelvin connection directly at the shunt. Keep the analog ground island (AVSS pin 27) tied to the single ground plane at one quiet point, away from gate-driver return currents.
ICSP programming requires matched PGECx/PGEDx pairs - if PGEC2 (pin 24) is used for ICSPCLK, ICSPDAT must be on PGED2 (pin 25); mixing pins from different pairs prevents device programming. Also remember that any RPn remappable input must be bound to exactly one peripheral, and remapping registers are write-protected after unlock sequence - configure PPS before enabling PWM outputs to avoid glitching the inverter bridge at boot.
Compliance Information
RoHS compliant and lead-free per Microchip product page and LCSC/DigiKey listings. REACH, halogen-free, and conflict-minerals status not explicitly stated in retrieved data - obtain material declarations from Microchip before regulatory submission.
