DSPIC33FJ128GP708A-I/PT Microchip dsPIC33F 16-Bit Digital Signal Controller 40MIPS 128KB Flash DMA Enhanced Capture/Compare TQFP-80

DSPIC33FJ128GP708A-I/PT Product Overview

The DSPIC33FJ128GP708A-I/PT is a Microchip enhanced general-purpose 16-bit Digital Signal Controller (DSC) in an 80-lead TQFP package, offering higher integration for high-end embedded applications requiring 3.3V operation, large memory, DMA high-speed data transfer, extensive precision timing control, and abundant I/Os. Based on the dsPIC33F core running at 40 MIPS, the DSPIC33FJ128GP708A-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. Compared to the 64-lead version, the DSPIC33FJ128GP708A-I/PT adds 16 extra pins, providing up to 69 general-purpose I/Os and 18-channel 10-bit ADC, significantly expanding peripheral connectivity and analog acquisition while maintaining the same DSP performance and memory footprint. The DSPIC33FJ128GP708A-I/PT features 9 input captures and 9 output compares/PWM, together with five 16-bit timers, enabling simultaneous generation of multiple independent PWMs or capture of numerous external events. The analog front-end of the DSPIC33FJ128GP708A-I/PT includes four analog comparators. Communication interfaces offer 2× UART, 2× SPI, and 2× 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 TQFP-80 package, the DSPIC33FJ128GP708A-I/PT is ideal for high-end industrial controllers, complex communication gateways, multi-axis motion control assistance, and precision instrumentation that demand many I/Os and multi-channel analog inputs.

DSPIC33FJ128GP708A-I/PT Core Features

Processor Core: The DSPIC33FJ128GP708A-I/PT features a 16-bit dsPIC33F core, 40 MIPS, DSP-enhanced instruction set

Program Memory: The DSPIC33FJ128GP708A-I/PT provides 128KB Flash

Data Memory: The DSPIC33FJ128GP708A-I/PT includes 16KB SRAM

DMA Controller: The DSPIC33FJ128GP708A-I/PT integrates a 4-channel DMA for high-speed peripheral-to-RAM, RAM-to-peripheral transfers

Enhanced Timers & Signal Processing: The DSPIC33FJ128GP708A-I/PT offers 5× 16-bit timers, 9× input capture, 9× output compare/PWM

Analog Front-End: The DSPIC33FJ128GP708A-I/PT features a 10-bit ADC (1.1 Msps, up to 18 channels), 4 analog comparators

Communication Interfaces: The DSPIC33FJ128GP708A-I/PT provides 2× UART, 2× SPI, 2× I2C, with Peripheral Pin Select (PPS)

System Management: The DSPIC33FJ128GP708A-I/PT contains a watchdog timer, BOR/POR, on-chip oscillator, hardware CRC

General Purpose I/O: The DSPIC33FJ128GP708A-I/PT delivers up to 69 programmable I/O pins

Power & Package: The DSPIC33FJ128GP708A-I/PT operates from 3.0V – 3.6V, TQFP-80 (12mm×12mm), industrial -40°C to +85°C

DSPIC33FJ128GP708A-I/PT Applications

High-End Industrial Automation: The DSPIC33FJ128GP708A-I/PT is ideal for PLCs requiring many I/Os and complex timing, distributed controllers, multi-axis motion control assistance

Communication Protocol Conversion: The DSPIC33FJ128GP708A-I/PT serves as multi-UART/SPI/I2C bridges, industrial Ethernet gateway co-processors

Multi-Channel Data Acquisition: The DSPIC33FJ128GP708A-I/PT enables 18-channel ADC with DMA-driven continuous acquisition for sensor concentrators, environmental monitoring, power monitoring

Precision Instrumentation: The DSPIC33FJ128GP708A-I/PT is suitable for multi-parameter monitors, analytical equipment, precision metering systems

General Complex Real-Time Control: The DSPIC33FJ128GP708A-I/PT excels in algorithm-intensive systems with high I/O and analog channel demands

DSPIC33FJ128GP708A-I/PT Key Advantages

80-Lead High I/O Density: The DSPIC33FJ128GP708A-I/PT provides up to 69 I/Os and 18 ADC channels in a 12mm×12mm package, significantly expanding connectivity, reducing reliance on external I/O expanders or analog multiplexers, simplifying system design and improving reliability.

DMA Frees CPU Bandwidth: The 4-channel DMA in the DSPIC33FJ128GP708A-I/PT automatically moves data between ADCs, UARTs, SPIs, and SRAM, allowing the 40 MIPS CPU to focus on core algorithms, especially beneficial for systems requiring continuous high-speed acquisition and multi-channel communication.

9 Capture / 9 Compare for Complex Timing: Abundant capture and compare channels on the DSPIC33FJ128GP708A-I/PT handle multiple encoder signals, generate numerous independent PWMs, or perform precise pulse measurements, providing powerful hardware support for multi-axis motion control assistance and power sequencing.

Massive Memory Footprint: The DSPIC33FJ128GP708A-I/PT’s 128KB Flash and 16KB SRAM comfortably host complex DSP libraries, dual protocol stacks, and an RTOS, providing a solid platform for long-term feature evolution.

Dual Communication Ports + PPS: 2× UART, 2× SPI, 2× I2C on the DSPIC33FJ128GP708A-I/PT can all be flexibly remapped, serving as a multi-protocol communication hub while retaining a debug console, and optimizing routing in high-density systems.

Mature Development Toolchain: The DSPIC33FJ128GP708A-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.

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FAQ

1. What is the key difference between the DSPIC33FJ128GP708A-I/PT and the GP706A?
   
   • Package & I/O: The DSPIC33FJ128GP708A-I/PT features an 80-lead TQFP with up to 69 I/Os; the GP706A has a 64-lead TQFP with up to 53 I/Os. The DSPIC33FJ128GP708A-I/PT adds 16 extra pins, expanding both digital I/O and analog inputs.
   • ADC Channels: The DSPIC33FJ128GP708A-I/PT's 10-bit ADC supports up to 18 analog input channels, compared to a maximum of 16 on the GP706A.
   • Commonality: Both share 128KB Flash, 16KB SRAM, 4-channel DMA, 9 input captures, 9 output compares/PWM, 4 analog comparators, and identical communication interfaces with PPS.
   • When 64 pins cannot meet I/O or analog channel requirements, the DSPIC33FJ128GP708A-I/PT provides a natural upward migration path.
2. What convenience does the 80-lead package bring to practical designs?
   
   • More I/Os reduce the need for external I/O expanders or multiplexers, lowering system complexity.
   • The 18-channel ADC can directly connect more sensors without external analog switches, improving acquisition speed and reliability.
   • Extra pins reserve hardware resources for future feature expansion, extending product lifecycle.
3. Can the 9 output compares simultaneously generate 9 PWM signals?
   Yes. Each output compare on the DSPIC33FJ128GP708A-I/PT can be independently configured for PWM mode, so up to 9 independent PWM signals can be generated simultaneously, ideal for multi-channel LED dimming, multi-axis stepper motor control, or multi-rail power sequencing.
4. What specific benefits does DMA bring to real-world projects?
   
   • During continuous 18-channel ADC sampling, DMA automatically transfers results into SRAM buffers without CPU intervention, ideal for high-speed multi-channel data logging and analysis.
   • For UART/SPI communication, DMA can send/receive data in the background, leaving the CPU to process complete packets, significantly improving system responsiveness in multi-protocol conversion.
   • Reduces the risk of data loss due to interrupt latency, enhancing real-time performance.
5. Can it be used to control a 3-phase motor?
   The 9 output compares can generate multiple PWM signals, but the DSPIC33FJ128GP708A-I/PT lacks complementary outputs and hardware dead-time insertion, making it unsuitable for directly driving a 3-phase BLDC/PMSM inverter bridge. It works very well for brushed DC motors or stepper motors (with external drivers). For high-performance 3-phase motor control, consider the dsPIC33F MC series.
6. What signals can the 18-channel ADC simultaneously acquire?
   In a multi-axis motion control assistance scenario, it can simultaneously capture multiple encoder analog outputs, various voltage rails, multiple current channels, and several temperature sensors. Combined with DMA, automated cyclic acquisition frees the CPU for core control algorithms.
7. What development tools and software are supported?
   
   • Free MPLAB X IDE and MPLAB XC16 compiler.
   • Hardware debuggers: PICkit 4 or MPLAB ICD 4, supporting in-circuit programming and real-time debugging.
   • MPLAB Code Configurator (MCC) graphically generates DMA and peripheral drivers, significantly lowering the development difficulty.
8. What is the size and soldering process for the TQFP-80 package?
   
   • Package body is 12mm×12mm with 0.5mm pin pitch, classified as a medium-density QFP.
   • Standard reflow soldering processes achieve high yield. 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 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 without an external reset IC.
10. What project stages is the DSPIC33FJ128GP708A-I/PT suitable for?
    It is well suited for high-end industrial controllers, multi-channel data acquisition systems, or communication gateways under development or upgrade, especially when 64 pins are insufficient for I/O and analog channel requirements. The DSPIC33FJ128GP708A-I/PT integrates DMA, abundant capture/compare channels, and large memory in an 80-lead package, making it an ideal choice for complex embedded control systems.