DSPIC33CK256MP305-I/M7 - 100MHz DSC, 256KB Flash | Microchip
MPN: DSPIC33CK256MP305-I/M7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.74 | $1,870.00 |
| 1,000 | $3.35 | $3,350.00 |
DSPIC33CK256MP305-I/M7 Overview
A digital signal controller combines the computational power of a digital signal processor (DSP) with the peripheral set and ease of use of a microcontroller (MCU). In the embedded systems hierarchy, the dsPIC33CK sits between general-purpose MCUs and full DSPs, offering fixed-point DSP instructions, fast interrupt handling and deterministic real-time behavior for control loops that must execute in microseconds.
Key features include the 100 MHz dsPIC33C DSC core with DSP-enhanced instruction set, 256KB of dual-panel flash enabling live firmware updates, 64KB of RAM for control buffers, 8 DMA channels for data movement without CPU overhead, 8 serial I/O channels, and 4 external interrupt inputs. The on-chip op amps and 12-bit ADCs reduce external component count in analog signal chains.
Technically, the dsPIC33CK core uses CMOS technology with a 16-bit fixed-point data path. The dual-panel flash architecture allows code execution from one panel while the other is erased or programmed, supporting field upgrades without stopping the control loop. The high-resolution PWM module supports complementary outputs with dead-time insertion, essential for three-phase inverter and power-converter designs.
Typical applications include brushless DC and PMSM motor control, digital power supplies (LLC, totem-pole PFC), solar inverters, and industrial automation control nodes. The integrated op amps buffer shunt-resistor current-sense signals directly into the ADCs, enabling field-oriented control (FOC) with minimal external circuitry.
Design consideration: all VDD and VSS pins must be connected, and any PGECx/PGEDx pair must be used together for ICSP programming; mixing PGEC2 with PGED1 will fail programming.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for DSPIC33CK256MP305-I/M7 — 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 DSPIC33CK256MP305-I/M7 (same form factor and footprint) — differing in Package, ADC Resolution, Core Architecture, Core Speed, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33CK256MP305-E/M7
✅ Drop-In✓ In Stock
$4.02 / Unit
View Datasheet →DSPIC33CK512MP305-I/M7
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.3 / Unit
View Datasheet →DSPIC33CK128MP305-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK64MP305-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK256MP505-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK256MP305-I/M7 Maximum Ratings & Electrical Characteristics
| Core | dsPIC33CK 16-bit DSC core |
| Core Speed | 100 MHz |
| Data Bus Width | 16 bit |
| Program Memory Size | 256 KB flash (dual panel) |
| RAM Size | 64 KB |
| ADC Resolution | 12 bit |
| Integrated Op Amps | Yes |
| PWM Peripheral | High-resolution PWM |
| DMA Channels | 8 |
| Serial I/O Channels | 8 |
| External Interrupt Inputs | 4 |
| Number Format | Fixed-point |
| Technology | CMOS |
| Package | 48-VQFN (6x6 mm) |
| Operating Temperature | -40C to +85C (I grade) |
| Mounting Type | Surface Mount |
| Programming Interface | ICSP via PGECx/PGEDx pair |
DSPIC33CK256MP305-I/M7 Pin Configuration
| Pin 1 | MCLR — Master clear reset / programming voltage input |
| Pin 2 | AN0/VREF+ — Analog input 0 / ADC positive voltage reference |
| Pin 3 | AN1/VREF- — Analog input 1 / ADC negative voltage reference |
| Pin 4 | PGED1/AN2 — Programming data 1 / analog input 2 |
| Pin 5 | PGEC1/AN3 — Programming clock 1 / analog input 3 |
| Pin 6 | OSCI/AN4 — Oscillator input / analog input 4 |
| Pin 7 | OSCO/AN5 — Oscillator output / analog input 5 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | VDD — Positive power supply |
| Pin 10 | PWM1L/RA0 — PWM output 1 low / port A bit 0 |
| Pin 11 | PWM1H/RA1 — PWM output 1 high / port A bit 1 |
| Pin 12 | PWM2L/RA2 — PWM output 2 low / port A bit 2 |
| Pin 13 | PWM2H/RA3 — PWM output 2 high / port A bit 3 |
| Pin 14 | PWM3L/RB0 — PWM output 3 low / port B bit 0 |
| Pin 15 | PWM3H/RB1 — PWM output 3 high / port B bit 1 |
| Pin 16 | OPA1OUT/PWM4L — Op amp 1 output / PWM output 4 low |
| Pin 17 | OPA1IN+/PWM4H — Op amp 1 non-inverting input / PWM 4 high |
| Pin 18 | OPA1IN-/RB2 — Op amp 1 inverting input / port B bit 2 |
| Pin 19 | OPA2OUT/PWM5L — Op amp 2 output / PWM 5 low |
| Pin 20 | OPA2IN+/PWM5H — Op amp 2 non-inverting input / PWM 5 high |
| Pin 21 | OPA2IN-/RB3 — Op amp 2 inverting input / port B bit 3 |
| Pin 22 | OPA3OUT/PWM6L — Op amp 3 output / PWM 6 low |
| Pin 23 | OPA3IN+/PWM6H — Op amp 3 non-inverting input / PWM 6 high |
| Pin 24 | OPA3IN-/RB4 — Op amp 3 inverting input / port B bit 4 |
| Pin 25 | VSS — Ground reference |
| Pin 26 | VDD — Positive power supply |
| Pin 27 | AN6/RB5 — Analog input 6 / port B bit 5 |
| Pin 28 | AN7/RB6 — Analog input 7 / port B bit 6 |
| Pin 29 | AN8/RB7 — Analog input 8 / port B bit 7 |
| Pin 30 | AN9/RB8 — Analog input 9 / port B bit 8 |
| Pin 31 | AN10/RB9 — Analog input 10 / port B bit 9 |
| Pin 32 | AN11/RB10 — Analog input 11 / port B bit 10 |
| Pin 33 | AN12/RB11 — Analog input 12 / port B bit 11 |
| Pin 34 | SOSCI/AN13 — Secondary oscillator input / analog input 13 |
| Pin 35 | SOSCO/AN14 — Secondary oscillator output / analog input 14 |
| Pin 36 | AN15/RB15 — Analog input 15 / port B bit 15 |
| Pin 37 | U1TX/RP1 — UART 1 transmit (remappable) / port pin |
| Pin 38 | U1RX/RP2 — UART 1 receive (remappable) / port pin |
| Pin 39 | SCK1/RP3 — SPI 1 clock (remappable) / port pin |
| Pin 40 | SDI1/RP4 — SPI 1 data in (remappable) / port pin |
| Pin 41 | SDO1/RP5 — SPI 1 data out (remappable) / port pin |
| Pin 42 | SCL1/RP6 — I2C 1 clock (remappable) / port pin |
| Pin 43 | SDA1/RP7 — I2C 1 data (remappable) / port pin |
| Pin 44 | PGED2/RP8 — Programming data 2 (remappable) / port pin |
| Pin 45 | PGEC2/RP9 — Programming clock 2 (remappable) / port pin |
| Pin 46 | INT0/RC0 — External interrupt 0 / port C bit 0 |
| Pin 47 | RC1 — General purpose I/O, port C bit 1 |
| Pin 48 | RC2 — General purpose I/O, port C bit 2 |
Typical Applications
DSPIC33CK256MP305-I/M7 is suitable for 6 applications: Brushless DC / PMSM Motor Control, Digital Power Supplies (LLC / Totem-Pole PFC), Industrial Automation and Motion Control Nodes, Solar Inverters and Renewable Energy Converters, Battery Management and Charging Systems, Consumer Appliances and E-mobility.
Brushless DC / PMSM Motor Control
The DSPIC33CK256MP305-I/M7 is purpose-built for field-oriented control (FOC) of BLDC and PMSM motors. Its 100 MHz DSP core executes current-loop control in a few microseconds, while the high-resolution PWM module generates complementary outputs with dead-time insertion for three-phase inverters. The integrated op amps amplify shunt-resistor current signals and feed the 12-bit ADCs directly, eliminating external amplifiers. The 64KB RAM holds multiple control history buffers, and 8 DMA channels move ADC results without CPU intervention. Firmware can be updated live thanks to dual-panel flash - the drive keeps running during reprogramming, a decisive benefit for motor drives in continuous-duty industrial equipment.
Recommended
Digital Power Supplies (LLC / Totem-Pole PFC)
In digital power conversion, the dsPIC33CK256MP305 delivers the fast deterministic control loops demanded by LLC resonant converters and totem-pole PFC stages. The high-resolution PWM provides sub-nanosecond duty-cycle resolution for tight regulation at high switching frequencies, while the fast 12-bit ADC samples output voltage and inductor current per switching cycle. The 100 MHz core runs voltage-mode or current-mode compensation loops in firmware, replacing analog compensation networks. Its 8 serial I/O channels and 4 external interrupt sources allow PMBus-style communication and fast fault shutdown. Dual-panel flash supports firmware updates in deployed power systems without interrupting the output rail.
Recommended
Industrial Automation and Motion Control Nodes
Factory automation systems use the dsPIC33CK256MP305 as a smart actuator and motion controller node. The 100 MHz core with DSP instructions runs PID position and velocity loops, while 8 serial I/O channels interface with encoders, displays and supervisory PLCs. The 4 external interrupt inputs provide fast limit-switch and fault response. The industrial -40C to +85C temperature grade (I suffix) suits unconditioned factory-floor enclosures. With 256KB flash and 64KB RAM, one controller can hold multiple motion profiles plus communication stacks. Integrated op amps and 12-bit ADCs condition analog position feedback, and 8 DMA channels keep the serial links serviced with minimal CPU load.
Recommended
Solar Inverters and Renewable Energy Converters
Grid-tied solar micro-inverters and MPPT converters benefit from the dsPIC33CK256MP305's combination of high-resolution PWM and fast analog acquisition. The 12-bit ADCs with DMA continuously sample PV voltage and current for maximum power point tracking, while the PWM module drives the power stage with fine duty-cycle resolution needed for efficiency optimization. The fixed-point DSP instruction set accelerates MPPT algorithm math. The 100 MHz core executes MPPT and grid-synchronization loops simultaneously, and the dual-panel flash allows firmware field updates in rooftop installations where physical access is costly. The 48-pin VQFN 6x6 mm package fits the compact thermal footprint of micro-inverter boards.
Recommended
Battery Management and Charging Systems
Battery chargers and battery-management front ends use the dsPIC33CK256MP305 for precise current and voltage regulation. The 12-bit ADCs and integrated op amps measure cell current via shunt resistors with minimal offset error, while high-resolution PWM controls synchronous buck charging stages with accurate dead time for high efficiency. The 100 MHz core runs charging state machines and coulomb-counting algorithms concurrently, with 64KB RAM retaining state across fast transients. Multiple serial channels communicate pack status to a host over UART, SPI or I2C, and external interrupts handle over-current protection events with deterministic latency. The industrial temperature grade covers automotive-adjacent charging environments.
Recommended
Consumer Appliances and E-mobility
Appliance blowers, pumps, e-bike drives, and drone ESCs adopt the dsPIC33CK256MP305 for compact, sensorless FOC drives. The 48-pin VQFN 6x6 mm surface-mount package suits dense power boards, while the 100 MHz core handles sensorless rotor-position estimation (sliding-mode or flux observers) in real time. Integrated op amps reduce bill-of-material cost in high-volume appliances, and 8 DMA channels offload ADC and serial traffic during multi-axis operation. Dual-panel flash enables field firmware updates in deployed e-mobility products. With 256KB flash, the controller stores multiple drive profiles for variable-speed appliance operation, and the -40C to +85C rating covers outdoor and garage-mounted equipment.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33CK256MP305-I/M7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33CK256MP305-E/M7 | DSPIC33CK512MP305-I/M7 | DSPIC33CK128MP305-I/M7 | DSPIC33CK64MP305-I/M7 | DSPIC33CK256MP505-I/M7 |
|---|---|---|---|---|---|---|
| Package | 48-VQFN (6x6 mm) | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Speed | 100 MHz | 100 MHz | 100 MHz | 100 MHz | 100 MHz | 100 MHz |
| Flash Memory | 256 KB (dual panel) | 256 KB (dual panel) | 512 KB (dual panel) | 128 KB | 64 KB | 256 KB (dual panel) |
| Operating Temperature | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| CAN FD Interface | No | No | No | No | No | Yes (CAN FD) |
| Integrated Op Amps / 12-bit ADC | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
Key Differentiators
- Extended temperature grade availability (vs DSPIC33CK256MP305-E/M7)
- Double the program memory on same footprint (vs DSPIC33CK128MP305-I/M7)
- Lower cost than CAN-FD sibling (vs DSPIC33CK256MP505-I/M7)
Design Notes
Connect every VDD and VSS pin pair. Per Microchip's dsPIC33CK documentation, omitting any VDD/VSS pin - even one - can cause ICSP programming to fail. Place a 100 nF ceramic decoupling capacitor at each VDD pin, as close to the pin as possible, plus at least one bulk 4.7-10 uF capacitor near the supply entry. The exposed pad under the 48-VQFN should be soldered to a grounded copper pour for thermal relief and signal-integrity grounds.
ICSP programming requires a matched PGECx/PGEDx pair: if PGEC2 carries ICSPCLK, then PGED2 must carry ICSPDAT. Mixing PGEC2 with PGED1 will fail. Additionally, ensure the PGED/PGEC pins chosen are not burdened with heavy loads (e.g., LED drivers or long traces) during programming. Reserve the pair with a series resistor and connector footprint in production boards for in-system firmware updates using PICkit 4 or ICD 4.
The PWM outputs driving power MOSFET gates toggle with fast edges that can couple into the 12-bit ADC inputs. Route analog traces (ANx, op-amp pins) on a quiet region of the board, use a solid ground plane under them, and keep the high-current gate loops physically separated from the current-sense shunt routing. Configure the ADC to sample during PWM off-time (trigger synchronized to the PWM module) to avoid switching-noise aliasing in the current-loop feedback.
Compliance Information
Compliance details were not present in the provided verified web data; consult the Microchip product page environmental datasheet for current RoHS/REACH status.
