DSPIC33FJ128GP802-I/MM Microchip dsPIC33F 16-Bit Digital Signal Controller 40MIPS 128KB Flash General Purpose PWM ADC QFN-28

DSPIC33FJ128GP802-I/MM Product Overview

The DSPIC33FJ128GP802-I/MM is a Microchip general-purpose 16-bit Digital Signal Controller (DSC) in a 28-lead QFN-S package, integrating 128KB Flash and 16KB SRAM in an extremely compact footprint. It is designed for 3.3V embedded applications where PCB space is critically limited yet significant processing power is required. Based on the dsPIC33F core running at 40 MIPS, it efficiently handles digital signal processing, closed-loop control, and communication stacks. The QFN package's exposed thermal pad efficiently conducts heat into the PCB, lowering junction temperature and enabling reliable operation at higher loads in tight spaces. On-chip peripherals include five 16-bit timers, four input captures, four output compares/PWM, a 10-bit ADC (up to 1.1 Msps, up to 13 analog input channels), and four analog comparators. Communication interfaces offer 2× UART, 1× SPI, and 1× I2C, all with Peripheral Pin Select (PPS). Operating from 3.0V to 3.6V with an industrial temperature range of -40°C to +85°C, in a QFN-28 package. It is ideal for size- and thermally-constrained industrial sensor nodes, portable instruments, communication gateways, and any general-purpose control application requiring large memory and rich peripherals in a minimal PCB area. The DSPIC33FJ128GP802-I/MM is a reliable choice for compact embedded systems.

DSPIC33FJ128GP802-I/MM Core Features

Processor Core: 16-bit dsPIC33F core, 40 MIPS, DSP-enhanced instruction set. The DSPIC33FJ128GP802-I/MM delivers high performance.

Program Memory: 128KB Flash. The DSPIC33FJ128GP802-I/MM provides ample code space.

Data Memory: 16KB SRAM. The DSPIC33FJ128GP802-I/MM offers generous data storage.

Timers & Signal Processing: 5× 16-bit timers, 4× input capture, 4× output compare/PWM. The DSPIC33FJ128GP802-I/MM handles timing and PWM tasks efficiently.

Analog Front-End: 10-bit ADC (1.1 Msps, up to 13 channels), 4 analog comparators. The DSPIC33FJ128GP802-I/MM integrates a rich analog front-end.

Communication Interfaces: 2× UART, 1× SPI, 1× I2C, with Peripheral Pin Select (PPS). The DSPIC33FJ128GP802-I/MM supports flexible communication.

System Management: Watchdog timer, BOR/POR, on-chip oscillator, hardware CRC. The DSPIC33FJ128GP802-I/MM ensures reliable system operation.

General Purpose I/O: Up to 21 programmable I/O pins. The DSPIC33FJ128GP802-I/MM offers plenty of GPIO.

Power & Package: 3.0V – 3.6V, QFN-28 (6mm×6mm), industrial -40°C to +85°C. The DSPIC33FJ128GP802-I/MM is designed for demanding environments.

DSPIC33FJ128GP802-I/MM Applications

Compact Industrial Nodes: Space-constrained sensor interfaces, process transmitters, micro distributed I/O modules. The DSPIC33FJ128GP802-I/MM excels in such nodes.

Communication Gateways: Dual-UART protocol converters, RS-485/RS-232 hubs, IoT edge controllers. The DSPIC33FJ128GP802-I/MM is ideal for gateways.

Portable & Consumer Electronics: Advanced HMIs, portable instruments, battery-powered smart devices. The DSPIC33FJ128GP802-I/MM fits portable designs perfectly.

General Real-Time Control: Algorithm-intensive embedded systems with stringent PCB size and thermal requirements. The DSPIC33FJ128GP802-I/MM handles real-time control with ease.

DSPIC33FJ128GP802-I/MM Key Advantages

Ultra-Compact QFN Package, High Power Density: The 6mm×6mm QFN saves approximately 50% PCB area compared to an equivalent SOIC, while the exposed thermal pad provides a low thermal resistance path, allowing higher processing loads in smaller volumes—ideal for high-density integration. The DSPIC33FJ128GP802-I/MM offers exceptional power density.

Massive Memory in a Tiny Footprint: 128KB Flash and 16KB SRAM are remarkably large for a 28-lead package, comfortably hosting complex algorithms, dual protocol stacks, and real-time data logging, with generous headroom for feature upgrades. The DSPIC33FJ128GP802-I/MM provides massive memory in a tiny footprint.

Dual UART + PPS for Flexible Communication: Two independent UARTs can simultaneously handle debug output and fieldbus communication, with PPS flexibly assigning pins to simplify layout on compact PCBs. The DSPIC33FJ128GP802-I/MM ensures flexible communication.

Enhanced Analog Front-End: 13-channel 10-bit ADC and four analog comparators provide a complete single-chip solution for multi-sensor acquisition and fast fault detection. The DSPIC33FJ128GP802-I/MM integrates a powerful analog front-end.

3.3V Single-Supply Operation: Level-compatible with mainstream MCUs, DSPs, and digital isolators, eliminating extra level shifters, reducing BOM cost, and simplifying power tree design. The DSPIC33FJ128GP802-I/MM operates from a single 3.3V supply.

Mature Development Toolchain: Free MPLAB X IDE and XC16 compiler, combined with MCC, DSP libraries, and peripheral libraries, enable rapid progress from prototype verification to production. The DSPIC33FJ128GP802-I/MM is supported by a mature toolchain.

Long-Term Availability: A mature dsPIC33F family product with stable long-term supply commitment. The DSPIC33FJ128GP802-I/MM ensures long-term availability.

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FAQ

1. What is the difference between the MM (QFN) and SO (SOIC) packages? How do I choose?
   
   • MM is a 28-lead QFN-S package (6mm×6mm) with an exposed thermal pad, offering a smaller footprint and better heat dissipation. The DSPIC33FJ128GP802-I/MM uses the MM package.
   • SO is a 28-lead SOIC narrow-body package with exposed leads, making hand soldering easier and more suitable for prototyping and low-volume production.
   • Choose MM if your design has extremely tight PCB area constraints or requires improved thermal performance. Choose SO if manual soldering convenience and visual inspection are higher priorities. The DSPIC33FJ128GP802-I/MM is the MM variant.
2. What should I pay attention to when soldering the QFN package?
   
   • The key is using the correct amount of solder paste on the thermal pad and employing vias to efficiently conduct heat into inner PCB copper layers. The DSPIC33FJ128GP802-I/MM requires careful soldering.
   • Follow the recommended land pattern in the datasheet and use standard reflow soldering for high yield. Hand soldering requires a hot air gun or preheater, and flux is recommended. The DSPIC33FJ128GP802-I/MM is a QFN device.
3. What can the 128KB Flash and 16KB SRAM do in such a small package?
   
   • Run complex DSP algorithms like FIR/IIR filters, FFT, and closed-loop control, while providing ample space for dual protocol stacks (e.g., Modbus + proprietary) and real-time data logging. The DSPIC33FJ128GP802-I/MM excels at these tasks.
   • The 16KB SRAM can buffer extensive ADC sampling data, support software oscilloscopes, long-term data logs, or complex state machines without external RAM. The DSPIC33FJ128GP802-I/MM provides generous SRAM.
4. Does it have DMA? How does it compare to other GP802 variants?
   
   • This model does not include a DMA controller; all data transfers are handled by the CPU. If DMA is required, choose an enhanced model with the “A” suffix. The DSPIC33FJ128GP802-I/MM does not have DMA.
   • Compared to the DSPIC33FJ64GP802, this device doubles Flash from 64KB to 128KB and SRAM from 8KB to 16KB, making it better suited for complex algorithm applications requiring larger memory. The DSPIC33FJ128GP802-I/MM offers double the memory.
5. What is the accuracy and speed of the 13-channel 10-bit ADC?
   
   • Sampling rate up to 1.1 Msps enables fast scanning of multiple analog channels, ideal for sensor concentrators and data acquisition systems. The DSPIC33FJ128GP802-I/MM has a fast ADC.
   • Oversampling and digital filtering via the DSP engine can effectively improve equivalent resolution for higher-precision measurement requirements. The DSPIC33FJ128GP802-I/MM supports oversampling.
6. Can it be used to control motors?
   
   • The four output compares can generate general-purpose PWM signals suitable for driving brushed DC motors or stepper motors (with external drivers). The DSPIC33FJ128GP802-I/MM can generate PWM.
   • It lacks hardware complementary outputs and dead-time insertion, making it unsuitable for directly driving 3-phase BLDC/PMSM inverter bridges. For high-performance motor control, consider the dsPIC33FJ128GP802-I/MM is not the best choice for 3-phase motors.
7. What communication interfaces does it have? Can it perform multi-protocol conversion simultaneously?
   
   • It provides 2× UART, 1× SPI, and 1× I2C, all with flexible PPS mapping. The DSPIC33FJ128GP802-I/MM offers flexible communication.
   • For example, one UART can serve as a debug console, another can connect to RS-485 or a Bluetooth module, SPI to an external ADC/DAC, and I2C to sensors or EEPROM, easily achieving multi-protocol conversion. The DSPIC33FJ128GP802-I/MM is ideal for protocol conversion.
8. What tools and environment are needed for development?
   
   • Free MPLAB X IDE and MPLAB XC16 compiler. The DSPIC33FJ128GP802-I/MM is supported by MPLAB.
   • Hardware debuggers: PICkit 4 or MPLAB ICD 4, supporting in-circuit programming and real-time debugging. The DSPIC33FJ128GP802-I/MM can be debugged with these tools.
   • MPLAB Code Configurator (MCC) graphically generates peripheral drivers, significantly lowering the development barrier. The DSPIC33FJ128GP802-I/MM benefits from MCC.
9. Does it require an external crystal and reset chip?
   
   • Built-in high-accuracy on-chip oscillator and PLL enable stable operation without an external crystal, saving PCB space and BOM cost. The DSPIC33FJ128GP802-I/MM has an internal oscillator.
   • Integrated Power-on Reset (POR) and Brown-out Reset (BOR) ensure reliable start-up without an external reset IC. The DSPIC33FJ128GP802-I/MM includes POR/BOR.
10. What project stages is the DSPIC33FJ128GP802-I/MM suitable for?
    It is ideal for compact industrial control, portable instrumentation, or communication gateway projects under development that have extremely tight PCB area and thermal constraints. Its QFN package combined with 128KB Flash and 16KB SRAM delivers powerful processing and storage in minimal space. The mature dsPIC33F architecture and abundant reference designs help accelerate the journey from prototype to production. The DSPIC33FJ128GP802-I/MM is a great choice for such projects.