DSPIC33EP256GM706T-I/MR - 16-bit 70 MIPS DSC 256KB Flash | Microchip
MPN: DSPIC33EP256GM706T-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.48 | $7.48 |
| 10 | $6.75 | $67.50 |
| 100 | $5.9 | $590.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
DSPIC33EP256GM706T-I/MR Overview
A digital signal controller combines the compute throughput of a digital signal processor with the peripheral integration and deterministic control flow of a microcontroller. Within the power-management hierarchy of embedded systems, the DSC sits between general-purpose MCUs and dedicated DSPs, making it the preferred controller class for real-time, closed-loop control such as field-oriented motor control and digital power conversion.
Key differentiating features include 12 motor control PWM channels (MCPWM), 8 input capture and 8 output capture/compare channels, two quadrature encoder interfaces (QEI), four integrated operational amplifiers, a Charge Time Measurement Unit (CTMU) for capacitive touch and precision timing, and a Reconfigurable Peripheral Grid (PTG) for hardware-triggered sequencing. Four DMA channels offload the CPU in high-bandwidth data paths, and CAN connectivity supports industrial networking.
Architecturally, the dsPIC33EP core pairs a 16-bit modified Harvard pipeline with a DSP engine (barrel shifter, 40-bit accumulator, single-cycle MAC) clocked up to 70 MIPS. Flash-based program memory with self-programming support enables field firmware updates. The integrated op-amps can be routed internally to ADC inputs, reducing external component count in current-sense front ends for inverters and motor drives.
Typical applications include BLDC/PMSM/AC-induction motor control, digital power supplies and solar inverters, industrial automation nodes on CAN, and sensor signal conditioning using the CTMU and on-chip analog.
Design consideration: the -I suffix grade covers -40C to +85C; for extended environments select the -E variant. VQFN exposed-pad thermal performance depends on a well-soldered ground pad and via array.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP256GM706T-I/MR — 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 DSPIC33EP256GM706T-I/MR (same form factor and footprint) — differing in Input Capture / Output Compare, Package, Operating Temperature, Program Memory (Flash), Quadrature Encoder Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP256GM306T-I/MR
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View Datasheet →DSPIC33EP256GM706-I/MR
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$4.35 / Unit
View Datasheet →DSPIC33EP256GM706-E/MR
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33EP256GM706T-I/MR Maximum Ratings & Electrical Characteristics
| Core | dsPIC33E 16-bit DSC core |
| Max CPU Speed | 70 MIPS |
| Flash Program Memory | 256 KB (85.5K x 24) |
| RAM | 16 KB |
| Supply Voltage | 3.3 V |
| Package | 64-VFQFN Exposed Pad (MR) |
| MCPWM Channels | 12 |
| Input Capture / Output Compare | 8 / 8 |
| Quadrature Encoder Interfaces | 2 |
| Integrated Op-Amps | 4 |
| CTMU | Yes (Charge Time Measurement Unit) |
| PTG | Yes (Reconfigurable Peripheral Grid) |
| DMA Channels | 4 |
| CAN | Yes |
| Operating Temperature | -40C to +85C (I grade) |
| Mounting Type | Surface Mount |
| Packaging Suffix (T) | Tape and Reel |
| Series | dsPIC33EP256GM706 |
DSPIC33EP256GM706T-I/MR 64-vfqfn exposed pad (mr) Pin Configuration Guide
Pin configuration for DSPIC33EP256GM706T-I/MR (64-vfqfn exposed pad (mr) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for DSPIC33EP256GM706T-I/MR.
Refer to the datasheet for full pin configuration.
Typical Applications
DSPIC33EP256GM706T-I/MR is suitable for 6 applications: BLDC/PMSM Motor Control, Digital Power Conversion, Industrial Automation and CAN Networking, Sensor Signal Conditioning, Embedded Control and IoT Edge Nodes, Audio and Signal Processing.
BLDC/PMSM Motor Control
The DSPIC33EP256GM706T-I/MR fits field-oriented control (FOC) motor drives because its 70 MIPS DSP engine executes single-cycle MAC operations for the current-loop math, while 12 MCPWM channels generate complementary, dead-time-controlled gate signals for three-phase inverters. The 2 QEI modules decode position from incremental encoders, and 4 on-chip op-amps amplify shunt-resistor current signals before the ADC samples them, cutting external analog components. In a typical topology the PWM peripherals run at 20 kHz, with ADC end-of-conversion triggers closing the FOC loop at the PWM rate. Trade-off: 70 MIPS sustains fast control loops but lacks floating-point hardware, so engineers use Q15 fixed-point math from Microchip's motor control libraries.
Recommended
Digital Power Conversion
Digital power supplies, LLC converters, and solar micro-inverters benefit from the DSPIC33EP256GM706T-I/MR's high-resolution PWM, 70 MIPS loop bandwidth, and deterministic interrupt latency. The 12 MCPWM channels provide phase-shifted and complementary outputs with programmable dead time, while the PTG (Reconfigurable Peripheral Grid) sequences protection events in hardware without CPU involvement - critical for fast over-current shutdown. The CTMU supports precise time-based measurements used in power-stage monitoring. In a typical digital power stage the ADC samples input/output voltage each switching cycle and the DSP engine updates the duty ratio within the same period. Trade-off: 16KB RAM is ample for multiple control loops but constrains very large compensation tables or logging buffers.
Recommended
Industrial Automation and CAN Networking
Factory automation nodes use the DSPIC33EP256GM706T-I/MR for sensor acquisition, actuator control, and CAN bus communication in a single chip. The on-chip CAN module connects the node to industrial networks such as CANopen or DeviceNet-style layers, while 8 input-capture and 8 output-compare channels handle timing-critical I/O like proximity-sensor pulses and valve actuation. The CTMU adds capacitive-touch or precision timing inputs for operator panels, and 4 DMA channels stream ADC data without CPU overhead. Robust industrial noise performance comes from the dsPIC33EP core's watchdog, brown-out, and code-protection features. Design consideration: external CAN transceiver and ESD protection are required on the CAN bus pins for field reliability.
Recommended
Sensor Signal Conditioning
The DSPIC33EP256GM706T-I/MR integrates 4 operational amplifiers that can be routed internally to the ADC, making it a compact analog front end for sensors such as pressure bridges, thermocouples, and current shunts. The CTMU measures charge time for capacitive sensing or high-resolution time-of-flight measurements, eliminating a separate touch controller in user-interface designs. With 70 MIPS of DSP headroom, filtering (IIR/FIR), calibration, and linearization run on-chip, transmitting only processed values over UART/SPI/CAN. Typical usage: configure one op-amp per gain stage in firmware-selectable gain, sample via DMA, and apply Q15 filtering. Trade-off: the integrated op-amps offer moderate bandwidth versus external precision amplifiers, so very high-frequency signals still require external conditioning.
Recommended
Embedded Control and IoT Edge Nodes
General embedded control systems leverage the DSPIC33EP256GM706T-I/MR's 256KB Flash for protocol stacks (CAN, UART, SPI, I2C), a bootloader, and application firmware with room for field updates via self-programming. The 64-VQFN exposed-pad package keeps board area small for compact edge nodes, and the 3.3V supply interfaces directly with common sensors and radios. The PTG automates simple I/O sequences while the CPU sleeps, reducing average power. Peripheral Pin Select lets firmware route digital peripherals to almost any pin, simplifying PCB routing. Trade-off: this DSC targets real-time control rather than ultra-low-power battery designs; for coin-cell applications a PIC16LF-class device with nanoWatt technology is more appropriate.
Recommended
Audio and Signal Processing
The DSPIC33EP256GM706T-I/MR serves cost-sensitive digital audio and general DSP tasks: the single-cycle MAC, dual 40-bit accumulators, and barrel shifter implement FIR/IIR filters, mixing, and AGC at 70 MIPS - sufficient for multiple channels at 48 kHz sample rates. The 256KB Flash holds long coefficient tables and voice/audio assets, and 4 DMA channels move ADC/DAC sample data without CPU stalls. Typical integration pairs an external codec over I2S-style clocking or uses the remappable SPI for audio data, with processing in Q15 fixed point. Trade-off: unlike a floating-point DSP, precision-critical high-dynamic-range processing requires careful Q15/Q30 scaling; for those workloads a dedicated DSP chip remains preferable.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP256GM706T-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP256GM306T-I/MR | DSPIC33EP256GM706-I/MR | DSPIC33EP256GM706-E/MR |
|---|---|---|---|---|
| Package | 64-VQFN (MR) exposed pad | 64-VQFN (MR) - same | 64-VQFN (MR) - same | 64-VQFN (MR) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Speed | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| Flash Memory | 256 KB | 128 KB | 256 KB | 256 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C |
| Peripherals (MCPWM/QEI/OpAmps) | 12 / 2 / 4 | 12 / 2 / 4 | 12 / 2 / 4 | 12 / 2 / 4 |
Key Differentiators
- Maximum Flash in the same VQFN-64 footprint (vs DSPIC33EP256GM306T-I/MR)
- Lower cost than extended-temperature grade (vs DSPIC33EP256GM706-E/MR)
- Production-friendly packaging (vs DSPIC33EP256GM706-I/MR)
Design Notes
The 64-VQFN exposed pad doubles as the primary thermal and ground connection. Solder the center pad to a ground plane through a 5x5 via array (approximately 0.3 mm vias); a voided or un-soldered pad degrades both thermal performance and analog noise floor. Place one 0.1uF ceramic decoupling capacitor within 2 mm of each VDD pin, plus bulk 10uF capacitance near the supply entry. Keep the exposed-pad via array clear of solder mask openings sized to avoid wicking during reflow.
Do not confuse the MR (VQFN-64) and PT/ML (TQFP-64) package variants when ordering - they share the same die but different footprints and are NOT interchangeable on one PCB. Remember the 'T' suffix means tape-and-reel (production packaging), not a different device. When migrating firmware from the DSPIC33EP256GM306 (128KB Flash) to this 256KB part, the linker scripts change; ensure configuration bit settings for oscillator, watchdog, and code protection are copied, since they are not part of the binary default.
For motor-control PWM outputs, route the 12 MCPWM gate signals away from encoder (QEI) and analog feedback traces; dsPIC33EP gate drivers switching amperes can couple glitches into current-sense channels. Use the on-chip op-amps as close as possible to the shunt resistors and sample with simultaneous ADC triggers synchronized to the PWM center (center-aligned trigger) to avoid switching noise in the current readings. Series terminate long UART/SPI lines over 15 cm to control ringing at 70 MIPS toggle rates.
Compliance Information
Compliance declarations were not present in the verified web data; obtain RoHS/REACH/conflict-minerals certificates from the Microchip product page or distributor compliance documents.
