DSPIC33FJ128GP708-I/PT Microchip dsPIC33F 16-Bit Digital Signal Controller 40MIPS 128KB Flash General Purpose PWM ADC TQFP-80

DSPIC33FJ128GP708-I/PT Product Overview

The DSPIC33FJ128GP708-I/PT is a Microchip general-purpose 16-bit Digital Signal Controller (DSC) in an 80-lead TQFP package, targeting industrial embedded applications that require 3.3V operation, large memory, abundant I/Os, and multi-channel analog acquisition. Based on the dsPIC33F core running at 40 MIPS, the DSPIC33FJ128GP708-I/PT integrates 128KB Flash and 16KB SRAM, comfortably hosting complex control algorithms, communication stacks, and real-time data buffering. The 80-lead package of the DSPIC33FJ128GP708-I/PT provides up to 69 general-purpose I/Os, complemented by an 18-channel 10-bit ADC (up to 1.1 Msps), significantly expanding peripheral connectivity and analog acquisition capabilities. On-chip peripherals of the DSPIC33FJ128GP708-I/PT include five 16-bit timers, four input captures, four output compares/PWM, and four analog comparators. Communication interfaces on the DSPIC33FJ128GP708-I/PT offer 2× UART, 2× SPI, and 2× I2C, all with Peripheral Pin Select (PPS) for flexible pin mapping and optimized high-density system layout. Operating from 3.0V to 3.6V with an industrial temperature range of -40°C to +85°C, in a TQFP-80 package, the DSPIC33FJ128GP708-I/PT suits standard industrial control applications requiring high I/O counts, sensor concentrators, communication gateways, and general real-time control systems.

DSPIC33FJ128GP708-I/PT Core Features

Processor Core: The DSPIC33FJ128GP708-I/PT features a 16-bit dsPIC33F core running at 40 MIPS, with a DSP-enhanced instruction set

Program Memory: The DSPIC33FJ128GP708-I/PT provides 128KB Flash

Data Memory: The DSPIC33FJ128GP708-I/PT includes 16KB SRAM

Timers & Signal Processing: The DSPIC33FJ128GP708-I/PT offers 5× 16-bit timers, 4× input capture, and 4× output compare/PWM

Analog Front-End: The DSPIC33FJ128GP708-I/PT features a 10-bit ADC (1.1 Msps, up to 18 channels) and 4 analog comparators

Communication Interfaces: The DSPIC33FJ128GP708-I/PT supports 2× UART, 2× SPI, and 2× I2C, with Peripheral Pin Select (PPS)

System Management: The DSPIC33FJ128GP708-I/PT includes a watchdog timer, BOR/POR, on-chip oscillator, and hardware CRC

General Purpose I/O: The DSPIC33FJ128GP708-I/PT provides up to 69 programmable I/O pins

Power & Package: The DSPIC33FJ128GP708-I/PT operates from 3.0V – 3.6V, in TQFP-80 (12mm×12mm), industrial -40°C to +85°C

DSPIC33FJ128GP708-I/PT Applications

Industrial Automation: The DSPIC33FJ128GP708-I/PT excels in PLC expansion modules requiring many I/Os, process controllers, and distributed control nodes

Communication Protocol Conversion: The DSPIC33FJ128GP708-I/PT is ideal for multi-UART/SPI/I2C bridges and industrial Ethernet gateway co-processors

Multi-Channel Data Acquisition: The DSPIC33FJ128GP708-I/PT supports 18-channel ADC for sensor concentrators, environmental monitoring, and power monitoring

General Real-Time Control: The DSPIC33FJ128GP708-I/PT suits embedded systems with high I/O and analog channel demands that do not rely on DMA

DSPIC33FJ128GP708-I/PT Key Advantages

80-Lead High I/O Density: The DSPIC33FJ128GP708-I/PT's 12mm×12mm package provides up to 69 I/Os and 18 ADC channels, significantly expanding connectivity and reducing reliance on external I/O expanders and analog multiplexers.

Large Memory for Unrestricted Computation: The DSPIC33FJ128GP708-I/PT's 128KB Flash and 16KB SRAM provide generous space for complex algorithms, dual protocol stacks, and real-time data logging, suitable for industrial products with long-term feature evolution.

Rich Communication Interfaces + PPS: The DSPIC33FJ128GP708-I/PT's 2× UART, 2× SPI, and 2× I2C can all be flexibly remapped, serving as a multi-protocol communication hub while retaining a debug console, and optimizing routing in high-density systems.

Enhanced Analog Front-End: The DSPIC33FJ128GP708-I/PT's 18-channel 10-bit ADC paired with four analog comparators delivers a complete single-chip solution for multi-sensor acquisition and fast fault response.

Mature Development Toolchain: The DSPIC33FJ128GP708-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 DSPIC33FJ128GP708-I/PT is a mature dsPIC33F family product with stable long-term supply commitment.

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FAQ

1. What is the key difference between the DSPIC33FJ128GP708-I/PT and the GP708A?
   
   • DMA: The DSPIC33FJ128GP708-I/PT has no DMA controller, so all data transfers must be handled by the CPU; the GP708A features a 4-channel DMA for automatic data movement.
   • Capture/Compare channels: The DSPIC33FJ128GP708-I/PT provides 4 input captures and 4 output compares/PWM; the GP708A offers 9 captures and 9 compares, making it better suited for complex multi-channel timing control.
   • Remaining peripherals: Flash (128KB), SRAM (16KB), ADC (18 channels), analog comparators (4), and communication interfaces are identical, and the packages are fully compatible.
   • If your application does not involve extensive background data transfers or a very high number of PWM/capture channels, the DSPIC33FJ128GP708-I/PT is more than sufficient for most standard industrial control needs.
2. Will high-speed ADC acquisition suffer without DMA on the DSPIC33FJ128GP708-I/PT?
   
   • Not having DMA does not prevent high-speed acquisition. The CPU can respond to ADC interrupts and read results after each conversion. 40 MIPS is sufficient to handle data movement and basic processing at moderate sample rates.
   • If an application requires sustained high sample rates (close to 1 Msps) while the CPU simultaneously runs complex algorithms, then an enhanced model with DMA (such as the GP708A) would be more appropriate.
3. What practical benefits does the 80-lead package of the DSPIC33FJ128GP708-I/PT offer?
   
   • The DSPIC33FJ128GP708-I/PT provides up to 69 general-purpose I/Os and 18 ADC channels in a 12mm×12mm package, significantly expanding connectivity and reducing the need for external I/O expanders and analog multiplexers.
   • Reserves sufficient pins for future feature expansion, extending product lifecycle and reducing the risk of redesign due to I/O shortages.
4. What functions can the 4 output compares of the DSPIC33FJ128GP708-I/PT achieve?
   They can generate four independent PWM signals for LED dimming, multiple brushed DC motor speed control, stepper motor control (with external drivers), or power sequencing. Meanwhile, the four input captures can measure the frequency and duty cycle of external signals.
5. Can the DSPIC33FJ128GP708-I/PT be used to control a 3-phase motor?
   The output compare modules lack complementary outputs and hardware dead-time insertion, making them unsuitable for directly driving a 3-phase BLDC/PMSM inverter bridge. However, it can certainly control brushed DC motors, stepper motors (with external drivers), or act as a supervisory motion controller. For high-performance 3-phase motor control, consider the dsPIC33F MC series.
6. What signals can the 18-channel ADC of the DSPIC33FJ128GP708-I/PT simultaneously acquire?
   In an industrial process control scenario, the DSPIC33FJ128GP708-I/PT can simultaneously capture multiple voltage, current, temperature, and pressure sensor signals. Multi-channel acquisition can be achieved via CPU interrupt or timer scanning without external analog switches.
7. What development tools and software are supported for the DSPIC33FJ128GP708-I/PT?
   
   • Free MPLAB X IDE and MPLAB XC16 compiler for the DSPIC33FJ128GP708-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, and DSP libraries provide extensive signal processing functions.
8. What is the size and soldering difficulty of the TQFP-80 package of the DSPIC33FJ128GP708-I/PT?
   
   • 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 the DSPIC33FJ128GP708-I/PT 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 new designs is the DSPIC33FJ128GP708-I/PT suitable for?
    The DSPIC33FJ128GP708-I/PT suits mid-to-high-end industrial control projects that do not require DMA but value I/O count, memory capacity, and multi-channel analog acquisition, such as PLC expansion modules, process controllers, sensor concentrators, and communication gateways. The dsPIC33F architecture is mature with abundant reference designs, helping shorten time-to-market.