DSPIC33FJ128GP306A-I/PT Microchip dsPIC33F 16-Bit Digital Signal Controller 40MIPS 128KB Flash DMA General Purpose PWM ADC TQFP-64

DSPIC33FJ128GP306A-I/PT Product Overview

The DSPIC33FJ128GP306A-I/PT is a Microchip enhanced general-purpose 16-bit Digital Signal Controller (DSC) in a 64-lead TQFP package, designed for complex 3.3V embedded control applications requiring large memory, DMA high-speed data transfer, and rich peripherals. Based on the dsPIC33F core running at 40 MIPS, the DSPIC33FJ128GP306A-I/PT integrates 128KB Flash and 16KB SRAM, along with a 4-channel DMA controller that automatically transfers data between peripherals and memory without CPU intervention, significantly boosting system throughput. On-chip peripherals of the DSPIC33FJ128GP306A-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 16 analog input channels), and four analog comparators. Communication interfaces on the DSPIC33FJ128GP306A-I/PT provide 2× UART, 2× SPI, and 2× I2C, all with Peripheral Pin Select (PPS) for flexible digital pin mapping. Operating from 3.0V to 3.6V with an industrial temperature range of -40°C to +85°C, the DSPIC33FJ128GP306A-I/PT suits industrial automation, instrumentation, communication gateways, and high-end consumer electronics that require DMA-assisted data acquisition, multi-protocol conversion, complex signal processing, and large memory.

DSPIC33FJ128GP306A-I/PT Core Features

Processor Core: The DSPIC33FJ128GP306A-I/PT features a 16-bit dsPIC33F core, 40 MIPS, DSP-enhanced instruction set

Program Memory: The DSPIC33FJ128GP306A-I/PT provides 128KB Flash

Data Memory: The DSPIC33FJ128GP306A-I/PT includes 16KB SRAM

DMA Controller: The DSPIC33FJ128GP306A-I/PT integrates a 4-channel DMA for high-speed peripheral-to-RAM, RAM-to-peripheral transfers

Timers & Signal Processing: The DSPIC33FJ128GP306A-I/PT offers 5× 16-bit timers, 4× input capture, 4× output compare/PWM

Analog Front-End: The DSPIC33FJ128GP306A-I/PT features a 10-bit ADC (1.1 Msps, up to 16 channels), 4 analog comparators

Communication Interfaces: The DSPIC33FJ128GP306A-I/PT provides 2× UART, 2× SPI, 2× I2C, with Peripheral Pin Select (PPS)

System Management: The DSPIC33FJ128GP306A-I/PT contains a watchdog timer, BOR/POR, on-chip oscillator, hardware CRC

General Purpose I/O: The DSPIC33FJ128GP306A-I/PT delivers up to 53 programmable I/O pins

Power & Package: The DSPIC33FJ128GP306A-I/PT operates from 3.0V – 3.6V, in a TQFP-64 package, industrial -40°C to +85°C

DSPIC33FJ128GP306A-I/PT Applications

Industrial Automation: The DSPIC33FJ128GP306A-I/PT is ideal for sensor concentrators with DMA-driven continuous acquisition, process controllers, distributed I/O modules

Communication Protocol Conversion: The DSPIC33FJ128GP306A-I/PT serves as multi-UART/SPI/I2C bridges, industrial Ethernet gateway co-processors

Digital Signal Processing: The DSPIC33FJ128GP306A-I/PT is suitable for real-time audio processing, digital filtering, FFT analysis, software-defined radio front-ends

General Complex Real-Time Control: The DSPIC33FJ128GP306A-I/PT excels in algorithm-intensive systems needing large memory, DMA, and multiple communication ports

DSPIC33FJ128GP306A-I/PT Key Advantages

DMA Frees CPU Bandwidth: The DSPIC33FJ128GP306A-I/PT’s 4-channel DMA controller automatically moves data between ADCs, UARTs, SPIs, and SRAM without CPU intervention, drastically reducing interrupt overhead and increasing data throughput, allowing the 40 MIPS CPU to focus on core algorithms.

Massive Memory Footprint: The DSPIC33FJ128GP306A-I/PT’s 128KB Flash and 16KB SRAM comfortably host complex DSP libraries, dual protocol stacks, and an RTOS, providing a solid foundation for long-term product evolution.

Enhanced Analog Front-End: The DSPIC33FJ128GP306A-I/PT’s 16-channel 10-bit ADC paired with four analog comparators provides a complete single-chip solution for multi-sensor acquisition and fast fault response.

Flexible Signal Generation & Measurement: The DSPIC33FJ128GP306A-I/PT’s four output compares/PWM generate multiple independent PWM signals; four input captures handle frequency/pulse-width measurement, meeting general control and simple motion control needs.

Dual Communication Ports + PPS: The DSPIC33FJ128GP306A-I/PT’s 2× UART, 2× SPI, 2× I2C can all be flexibly remapped, serving as a multi-protocol communication hub while retaining a debug console.

Mature Development Toolchain: The DSPIC33FJ128GP306A-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 DSPIC33FJ128GP306A-I/PT is a mature dsPIC33F family product with stable long-term supply commitment.

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FAQ

1. What does the “A” suffix represent? How does it differ from the non-A version?
   
   • A denotes an enhanced variant, with the most significant upgrade being the addition of a 4-channel DMA controller, which the standard GP306 lacks.
   • Additionally, the DSPIC33FJ128GP306A-I/PT increases the number of analog comparators from 3 to 4, and minor performance optimizations may be present. All other peripherals and the package remain fully compatible with the GP306.
2. What specific benefits does DMA bring to real-world projects?
   
   • During continuous ADC sampling, the DMA in the DSPIC33FJ128GP306A-I/PT automatically transfers results into SRAM buffers without CPU intervention, ideal for high-speed data logging and spectrum analysis.
   • For UART/SPI communication, the DMA of the DSPIC33FJ128GP306A-I/PT can send/receive data in the background, leaving the CPU to process complete packets, significantly improving system responsiveness in multi-protocol conversion.
   • The DMA reduces the risk of data loss due to interrupt latency, enhancing real-time performance of the DSPIC33FJ128GP306A-I/PT.
3. How does this model compare to the DSPIC33FJ64GP706A?
   
   • Memory: The DSPIC33FJ128GP306A-I/PT features 128KB Flash, doubling the GP706A's 64KB, suitable for larger program or data storage.
   • Capture/Compare channels: The DSPIC33FJ128GP306A-I/PT offers 4 input captures and 4 output compares, whereas the GP706A provides 9 captures/9 compares, making the latter better for multi-channel complex timing control.
   • Package: The DSPIC33FJ128GP306A-I/PT uses a 64-lead TQFP, while the GP706A uses a 100-lead TQFP. The DSPIC33FJ128GP306A-I/PT provides a memory advantage in medium-density applications.
   • Both feature 4-channel DMA and 4 analog comparators.
4. Can this chip run an RTOS?
   Absolutely. The DSPIC33FJ128GP306A-I/PT’s 128KB Flash and 16KB SRAM provide ample program and data space for embedded real-time operating systems (e.g., FreeRTOS), and its DMA efficiently supports multi-tasking and peripheral management.
5. What data acquisition rate can the ADC achieve with DMA?
   The ADC of the DSPIC33FJ128GP306A-I/PT samples at up to 1.1 Msps, and the DMA can automatically move each conversion result to SRAM for seamless continuous acquisition. Practical sustained throughput depends on DMA channel priority and bus bandwidth, but performance matching the sampling rate is achievable in most applications with the DSPIC33FJ128GP306A-I/PT.
6. Can it be used to control motors?
   The four output compares on the DSPIC33FJ128GP306A-I/PT can generate simple PWM signals suitable for driving brushed DC or stepper motors (with external drivers). The DSPIC33FJ128GP306A-I/PT lacks complementary outputs and hardware dead-time insertion, making it unsuitable for directly driving 3-phase BLDC/PMSM motors. For dedicated motor control, the dsPIC33F MC series is recommended.
7. What development tools and software are supported?
   
   • Free MPLAB X IDE and MPLAB XC16 compiler for the DSPIC33FJ128GP306A-I/PT.
   • Hardware debuggers: PICkit 4 or MPLAB ICD 4, supporting in-circuit programming and real-time debugging of the DSPIC33FJ128GP306A-I/PT.
   • MPLAB Code Configurator (MCC) graphically generates DMA and peripheral drivers, significantly lowering the development difficulty for the DSPIC33FJ128GP306A-I/PT.
8. What is the size and soldering process for the TQFP-64 package?
   
   • The DSPIC33FJ128GP306A-I/PT comes in a 10mm×10mm package with 0.5mm pin pitch, classified as a medium-density QFP.
   • Standard reflow soldering processes achieve high yield with the DSPIC33FJ128GP306A-I/PT. Hand soldering is also possible using flux and drag-soldering techniques.
9. Does it require external clock or reset circuitry?
   
   • Built-in high-accuracy on-chip oscillator and PLL on the DSPIC33FJ128GP306A-I/PT enable stable operation without an external crystal, saving PCB space and BOM cost.
   • Integrated Power-on Reset (POR) and Brown-out Reset (BOR) ensure reliable start-up of the DSPIC33FJ128GP306A-I/PT without an external reset IC.
10. Is the DSPIC33FJ128GP306A suitable for new designs?
    It is a mature, reliable high-end general-purpose DSC with 128KB Flash, 16KB SRAM, 4-channel DMA, and dual communication interfaces. The DSPIC33FJ128GP306A-I/PT offers excellent cost-effectiveness for industrial automation, communication gateways, and instrumentation applications requiring large memory and high-speed data processing. Microchip provides long-term availability for this family, making the DSPIC33FJ128GP306A-I/PT ideal for new designs that require stable supply and long-term evolution.