Product Overview
The PIC18F4331-I is a 40/44-pin, 8-bit high-performance Flash microcontroller from Microchip Technology featuring the PIC18 architecture with advanced motion control peripherals. With 4096 single-word instructions and a 31-level deep hardware stack, this motor-control-optimized MCU offers 8KB (4K x 16) of Flash program memory, 768 bytes of RAM, and 256 bytes of data EEPROM. Operating at up to 40 MHz (10 MIPS), it integrates a 9-channel 10-bit 200 Ksps ADC, a Motion Feedback Module with Quadrature Encoder Interface (QEI), three capture inputs, eight Power Control PWM outputs, two analog comparators, an MSSP (SPI/I2C), an Enhanced Addressable USART with LIN support, and an 8 MHz internal oscillator with PLL. Designed specifically for advanced motor control and motion applications, the PIC18F4331 combines high-current PWM with encoder feedback capability, making it ideal for BLDC motors, servo systems, industrial drives, and automotive motor control applications requiring position feedback.
Key Specifications
| Core Architecture | 8-bit PIC18 RISC Architecture |
| Program Memory | 8KB Flash (4K x 16 words) |
| RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum Speed | 40 MHz (10 MIPS) |
| Operating Voltage | 4.2V to 5.5V |
| I/O Pins | 36 |
| ADC | 10-bit, 9 channels, 200 Ksps |
| Comparators | 2 analog comparators |
| Timers | 4 timers (TMR0 8/16-bit, TMR1/3/5 16-bit) |
| PWM | 8 PWM outputs (Power Control PWM module) |
| QEI | Quadrature Encoder Interface (Motion Feedback Module) |
| Input Capture | 3 input capture channels |
| Communication | SPI, I2C (MSSP), EUSART/LIN |
| Internal Oscillator | 8 MHz, 6 selectable frequencies |
| PLL | 4x PLL (up to 32 MHz with internal osc) |
| Stack Levels | 31-level hardware stack |
| Hardware Multiplier | 8 x 8 single-cycle hardware multiplier |
| Low Power | nanoWatt technology |
| Debug | In-Circuit Debug (ICD) |
| Operating Temperature | -40°C to +85°C (Industrial) |
| Package | 40-pin PDIP / 44-pin TQFP / QFN |
Features
- High-performance PIC18 RISC CPU with 10 MIPS at 40 MHz
- 16-bit wide instructions, 8-bit wide data path
- 31-level deep software accessible hardware stack
- 8 x 8 single-cycle hardware multiplier
- Priority levels for interrupts
- Power Control PWM Module: 8 PWM outputs
- Half-bridge, full-bridge, push-pull, and single PWM modes
- Programmable dead time and auto-shutdown on fault
- Motion Feedback Module (MFM) with Quadrature Encoder Interface (QEI)
- Three independent Input Capture channels with Timer5 time base
- 9-channel 10-bit ADC with 200 Ksps conversion rate
- Programmable acquisition time for reduced software overhead
- Two analog comparators with programmable voltage reference
- Master Synchronous Serial Port (MSSP): SPI and I2C
- Enhanced Addressable USART with LIN/J2602 support
- Auto-baud detect and auto-wake-up on Start bit
- 16-bit Baud Rate Generator for high resolution
- Internal 8 MHz oscillator with 6 selectable frequencies
- 4x Phase Lock Loop (PLL)
- Fail-Safe Clock Monitor and Two-Speed Oscillator Start-up
- Timer0: 8/16-bit timer/counter with 8-bit prescaler
- Timer1, Timer3, Timer5: 16-bit timer/counters with prescaler
- Power-managed modes: Run, Idle, Sleep
- Extended Watchdog Timer (WDT) with 16-bit prescaler
- Brown-out Reset (BOR) and Power-on Reset (POR)
- Self-programmable under software control
- In-Circuit Serial Programming (ICSP) via two pins
- In-Circuit Debug (ICD) support
- Programmable code protection
- 36 I/O pins with 25 mA sink/source capability
Applications
- Brushless DC (BLDC) motor control with encoder feedback
- Servo motor control and positioning systems
- Industrial motor drives and inverters
- Automotive motor control (fuel pumps, fans, actuators)
- Robotics and motion control systems
- Power conversion and inverter systems
- Industrial automation with position feedback