DSPIC33FJ128GP804-I/PT Microchip dsPIC33F 16-Bit Digital Signal Controller 40MIPS 128KB Flash General Purpose PWM ADC TQFP-44

DSPIC33FJ128GP804-I/PT Product Overview

The DSPIC33FJ128GP804-I/PT is a Microchip general-purpose 16-bit Digital Signal Controller (DSC) in a 44-lead TQFP package, targeting standard industrial embedded applications that require 3.3V operation, large memory, and multiple communication ports. Based on the dsPIC33F core running at 40 MIPS, the DSPIC33FJ128GP804-I/PT integrates 128KB Flash and 16KB SRAM, comfortably hosting complex control algorithms, dual protocol stacks, and real-time data buffering. On-chip peripherals of the DSPIC33FJ128GP804-I/PT 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 on the DSPIC33FJ128GP804-I/PT offer 2× UART, 1× SPI, and 1× I2C, all with Peripheral Pin Select (PPS) for flexible pin mapping. Operating from 3.0V to 3.6V with an industrial temperature range of -40°C to +85°C, in a TQFP-44 package, the DSPIC33FJ128GP804-I/PT suits industrial automation, sensor concentrators, communication gateways, and any standard-temperature embedded system needing large memory and rich peripherals.

DSPIC33FJ128GP804-I/PT Core Features

Processor Core: The DSPIC33FJ128GP804-I/PT features a 16-bit dsPIC33F core running at 40 MIPS, with a DSP-enhanced instruction set

Program Memory: The DSPIC33FJ128GP804-I/PT provides 128KB Flash

Data Memory: The DSPIC33FJ128GP804-I/PT includes 16KB SRAM

Timers & Signal Processing: The DSPIC33FJ128GP804-I/PT offers 5× 16-bit timers, 4× input capture, and 4× output compare/PWM

Analog Front-End: The DSPIC33FJ128GP804-I/PT features a 10-bit ADC (1.1 Msps, up to 13 channels) and 4 analog comparators

Communication Interfaces: The DSPIC33FJ128GP804-I/PT supports 2× UART, 1× SPI, and 1× I2C, with Peripheral Pin Select (PPS)

System Management: The DSPIC33FJ128GP804-I/PT includes a watchdog timer, BOR/POR, on-chip oscillator, and hardware CRC

General Purpose I/O: The DSPIC33FJ128GP804-I/PT provides up to 35 programmable I/O pins

Power & Package: The DSPIC33FJ128GP804-I/PT operates from 3.0V – 3.6V, in TQFP-44 (10mm×10mm), industrial -40°C to +85°C

DSPIC33FJ128GP804-I/PT Applications

Industrial Automation: The DSPIC33FJ128GP804-I/PT excels in process controllers, sensor interfaces, distributed I/O modules, and motion control assistance

Communication Gateways: The DSPIC33FJ128GP804-I/PT is ideal for dual-UART protocol converters, RS-485/RS-232 hubs, and IoT edge nodes

Consumer & Appliance: The DSPIC33FJ128GP804-I/PT supports smart appliance main controls, HMIs, and audio processing

General Real-Time Control: The DSPIC33FJ128GP804-I/PT suits medium-density embedded systems needing large memory and rich peripherals

DSPIC33FJ128GP804-I/PT Key Advantages

Massive Memory for Unrestricted Applications: The DSPIC33FJ128GP804-I/PT's 128KB Flash and 16KB SRAM are exceptionally generous in a 44-lead package, simultaneously running complex algorithms, multi-tasking logic, and communication stacks, with ample headroom for feature upgrades.

Dual UART + PPS Flexible Communication: The DSPIC33FJ128GP804-I/PT's two independent UARTs can simultaneously handle debug output and fieldbus, with PPS flexibly assigning pins to simplify wiring and easily handle multi-protocol conversion.

Enhanced Analog Front-End: The DSPIC33FJ128GP804-I/PT's 13-channel 10-bit ADC paired with four analog comparators provides a complete single-chip solution for multi-sensor acquisition and fast fault detection.

Compact TQFP-44 Package: The DSPIC33FJ128GP804-I/PT's 10mm×10mm standard package offers up to 35 I/Os and 13 analog channels with 0.8mm pin pitch, easy for hand soldering and automated production, balancing peripheral count with PCB area.

3.3V Low-Voltage Operation: The DSPIC33FJ128GP804-I/PT is level-compatible with mainstream MCUs, DSPs, and digital isolators, eliminating extra level shifters, reducing BOM cost, and simplifying power design.

Mature Development Toolchain: The DSPIC33FJ128GP804-I/PT is supported by free MPLAB X IDE and XC16 compiler, combined with MCC, DSP libraries, and peripheral libraries, enabling rapid progress from prototype verification to production.

Long-Term Availability: The DSPIC33FJ128GP804-I/PT is a mature dsPIC33F family product with stable long-term supply commitment.

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FAQ

1. What is the difference between the DSPIC33FJ128GP804-I/PT and the -E/PT? How do I choose?
   
   • Temperature Range: The DSPIC33FJ128GP804-I/PT operates over the industrial range of -40°C to +85°C, while the E version extends to -40°C to +125°C. Chip functionality, performance, and package are identical; only the temperature rating differs.
   • For the vast majority of indoor industrial environments, commercial equipment, and sheltered outdoor applications, the DSPIC33FJ128GP804-I/PT is sufficient. If your device will be installed in engine compartments, near industrial furnaces, or in desert environments, choose the E version.
2. Does the DSPIC33FJ128GP804-I/PT have DMA? How does it differ from the “A” variants?
   
   • The DSPIC33FJ128GP804-I/PT does not include a DMA controller; all data transfers between peripherals and memory are handled by the CPU. If DMA-assisted data movement is required to free CPU bandwidth, choose an enhanced model with the “A” suffix.
   • Compared to the DSPIC33FJ64GP804, the DSPIC33FJ128GP804-I/PT doubles Flash from 64KB to 128KB and SRAM from 8KB to 16KB, making it better suited for complex algorithm applications needing larger memory.
3. What can 128KB Flash and 16KB SRAM on the DSPIC33FJ128GP804-I/PT do? Is it enough?
   
   • The DSPIC33FJ128GP804-I/PT easily hosts complex DSP algorithms (e.g., FIR/IIR filtering, FFT), dual communication protocol stacks (e.g., Modbus plus proprietary), and real-time data logging.
   • The 16KB SRAM can buffer extensive ADC sampling data, support a lightweight RTOS (e.g., FreeRTOS) or complex state machines without external RAM—more than sufficient for most industrial control and communication gateway applications.
4. How many I/Os and analog channels does the 44-lead package of the DSPIC33FJ128GP804-I/PT provide?
   
   • The DSPIC33FJ128GP804-I/PT provides up to 35 general-purpose I/O pins, meeting the peripheral connection needs of moderately complex systems.
   • The 10-bit ADC of the DSPIC33FJ128GP804-I/PT supports up to 13 analog input channels, simultaneously acquiring multiple sensor, voltage, and current signals, with 4 analog comparators for fast fault protection.
5. Can the DSPIC33FJ128GP804-I/PT be used to control motors?
   
   • The four output compares of the DSPIC33FJ128GP804-I/PT can generate general-purpose PWM signals suitable for driving brushed DC motors or stepper motors (with external drivers).
   • 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 dsPIC33F MC series.
6. What communication interfaces does the DSPIC33FJ128GP804-I/PT have? Can it perform multi-protocol conversion simultaneously?
   
   • The DSPIC33FJ128GP804-I/PT provides 2× UART, 1× SPI, and 1× I2C, all with flexible PPS mapping.
   • 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.
7. Is the industrial temperature range of -40°C to +85°C sufficient for the DSPIC33FJ128GP804-I/PT?
   
   • This is the most commonly used temperature range for industrial electronics, covering the vast majority of factory floors, commercial environments, and sheltered outdoor equipment.
   • The integrated Power-on Reset (POR), Brown-out Reset (BOR), and on-chip oscillator remain stable across the full temperature range, eliminating the need for external chips, simplifying design, and improving reliability.
8. What tools are needed for development and debugging of the DSPIC33FJ128GP804-I/PT?
   
   • Free MPLAB X IDE and MPLAB XC16 compiler for the DSPIC33FJ128GP804-I/PT.
   • Hardware debuggers: PICkit 4 or MPLAB ICD 4, supporting in-circuit programming and real-time debugging.
   • MPLAB Code Configurator (MCC) graphically generates peripheral drivers, significantly lowering the development barrier.
9. What is the size and soldering difficulty of the TQFP-44 package of the DSPIC33FJ128GP804-I/PT?
   
   • Package body is 10mm×10mm with 0.8mm pin pitch, a medium-density QFP that is easier to hand-solder than 0.5mm pitch packages.
   • Standard reflow soldering processes achieve high yield. Hand soldering is also feasible using flux and drag-soldering techniques.
10. What new designs is the DSPIC33FJ128GP804-I/PT suitable for?
    The DSPIC33FJ128GP804-I/PT is ideal for mid-complexity industrial control, communication gateway, and instrumentation projects under development or upgrade, especially those requiring large memory (128KB Flash/16KB SRAM) but not DMA. The mature dsPIC33F architecture with abundant reference designs enables rapid progress from prototype verification to production, with reliable long-term operation in standard industrial temperature environments.