PIC32MX795F512L-80IPT MCU Microchips 32 Bit Microcontroller Ic

Product Specification

The PIC32MX795F512L-80IPT is a high-performance 32-bit microcontroller from Microchip Technology, based on the MIPS32® M4K® core.

It operates at 80 MHz and integrates rich peripherals, making it suitable for embedded control, communication, and industrial automation systems.

Below is a detailed analysis of its operational principles in various applications.

1. Core Architecture & Operating Principle

1.1 MIPS32® M4K® Processor Core

• 80 MHz clock speed (105 DMIPS performance) with 5-stage pipeline for efficient instruction execution.

• MIPS16e® mode reduces code size by up to 40%, optimizing memory usage.

• Harvard architecture with separate instruction and data buses for faster processing.

1.2 Memory Subsystem

• 512 KB Flash (for program storage) + 128 KB SRAM (for data).

• Prefetch cache module accelerates execution from Flash, reducing wait states

1.3 Clock & Power Management

• Programmable PLLs & multiple clock sources (internal oscillator, external crystal).

• Low-power modes (Sleep, Idle) with 0.5 mA/MHz dynamic current and 41 µA standby current

• Fail-Safe Clock Monitor (FSCM) ensures system reliability during clock failures

2. Key Peripherals & Application-Specific Principles

2.1 Communication Interfaces

A. Ethernet (10/100 Mbps MAC with RMII/MII Interface)

• Principle: Used in industrial automation (PLC, SCADA) and IoT gateways.

• Role: Enables TCP/IP communication with cloud servers or local networks.

• Example: In a water treatment plant control system, it connects sensors to a central SCADA system via LAN

B. USB 2.0 (Full-Speed OTG Controller)

• Principle: Supports device/host/OTG modes for interfacing with peripherals (printers, storage).

• Example: In medical devices, it enables data transfer to a PC for diagnostics

C. CAN 2.0B (Dual Controllers)

• Principle: Used in automotive (ECU, diagnostics) and industrial control (CAN bus networks).

• Example: In a factory automation system, it ensures redundant communication when Ethernet fails

D. UART/SPI/I²C (Multiple Modules)

• Principle: Interfaces with sensors (RS-485, RS-232), displays, and wireless modules (Wi-Fi, Bluetooth).

• Example: In a wireless tank-level monitoring system, UART connects to an Si4432 RF module for wireless data transmission

2.2 Analog & Control Peripherals

A. 10-bit ADC (1 Msps, 16 Channels)

• Principle: Samples sensor signals (temperature, pressure, voltage) in real time.

• Example: In industrial process control, it reads 4-20 mA sensor outputs for closed-loop control

B. PWM & Timers (5x 16-bit Timers, 5x PWM Outputs)

• Principle: Drives motors (BLDC, stepper), LED dimming, and power converters.

• Example: In robotics, PWM controls servo motors for precise positioning

C. Parallel Master Port (PMP) for LCD/External Memory

• Principle: Directly interfaces with TFT displays or SRAM/Flash memory.

• Example: In HMI panels, it drives a 10.4-inch TFT touchscreen for user interaction

3. System Design Considerations

3.1 Power Supply & PCB Layout

• Operating Voltage: 2.3V–3.6V (requires stable LDO/DC-DC regulation).

• Decoupling capacitors near power pins to minimize noise.

3.2 Thermal Management

• TQFP-100 package requires proper heat dissipation in high-load conditions.

3.3 Debugging & Development Tools

• MPLAB X IDE + Harmony Framework simplifies firmware developmen

• JTAG debugging for real-time code analysis.

4. Comparison with Competing MCUs

Development Tools

• MPLAB X IDE: Comprehensive IDE with debugger and compiler support 
• Harmony 3 Framework: Pre-built software modules for TCP/IP, RTOS, and motor control 
• Evaluation Boards: PIC32MX795F512L Starter Kit for rapid prototyping