DEVICE OVERVIEW
This document contains device-specific information for the following devices:

• PIC18F2331 • PIC18LF2331
• PIC18F2431 • PIC18LF2431
• PIC18F4331 • PIC18LF4331
• PIC18F4431 • PIC18LF4431

This family offers the advantages of all PIC18 microcontrollers – namely, high computational performance at an economical price, with the addition of high-endurance enhanced Flash program memory and a high-speed 10-bit A/D Converter. On top of these features, the PIC18F2331/2431/4331/4431 family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power control and motor control applications.

14-Bit Power Control PWM Module:
• Up to 4 Channels with Complementary Outputs
• Edge or Center-Aligned Operation
• Flexible Dead-Band Generator
• Hardware Fault Protection Inputs
• Simultaneous Update of Duty Cycle and Period:
  - Flexible Special Event Trigger output

Motion Feedback Module:
• Three Independent Input Capture Channels:
  - Flexible operating modes for period and pulse-width measurement
  - Special Hall sensor interface module
  - Special Event Trigger output to other modules
• Quadrature Encoder Interface:
  - 2-phase inputs and one index input from encoder
  - High and low position tracking with direction status and change of direction interrupt
  - Velocity measurement

High-Speed, 200 ksps 10-Bit A/D Converter:
• Up to 9 Channels
• Simultaneous, Two-Channel Sampling
• Sequential Sampling: 1, 2 or 4 Selected Channels
• Auto-Conversion Capability
• 4-Word FIFO with Selectable Interrupt Frequency
• Selectable External Conversion Triggers
• Programmable Acquisition Time

Flexible Oscillator Structure:
• Four Crystal modes up to 40 MHz
• Two External Clock modes up to 40 MHz
• Internal Oscillator Block:
  - 8 user-selectable frequencies: 31 kHz to 8 MHz
  - OSCTUNE can compensate for frequency drift
• Secondary Oscillator using Timer1 @ 32 kHz
• Fail-Safe Clock Monitor:
  - Allows for safe shutdown of device if clock fails

  Power-Managed Modes:
• Run: CPU on, Peripherals on
• Idle: CPU off, Peripherals on
• Sleep: CPU off, Peripherals off
• Ultra Low, 50 nA Input Leakage
• Idle mode Currents Down to 5.8 A, Typical
• Sleep Current Down to 0.1 A, Typical
• Timer1 Oscillator, 1.8 A, Typical, 32 kHz, 2V
• Watchdog Timer (WDT), 2.1 A, typical
• Oscillator Two-Speed Start-up
  - Fast wake from Sleep and Idle, 1 s, typical

Peripheral Highlights:
• High-Current Sink/Source 25 mA/25 mA
• Three External Interrupts
• Two Capture/Compare/PWM (CCP) modules
• Enhanced USART module:
  - Supports RS-485, RS-232 and LIN/J2602
  - Auto-wake-up on Start bit
  - Auto-Baud Detect

Special Microcontroller Features:
• 100,000 Erase/Write Cycle Enhanced Flash Program Memory, Typical
• 1,000,000 Erase/Write Cycle Data EEPROM Memory, Typical
• Flash/Data EEPROM Retention: 100 Years
• Self-Programmable under Software Control
• Priority Levels for Interrupts
• 8 x 8 Single-Cycle Hardware Multiplier
• Extended Watchdog Timer (WDT):
- Programmable period from 41 ms to 131s
• Single-Supply In-Circuit Serial Programming™ (ICSP™) via Two Pins
• In-Circuit Debug (ICD) via Two Pins:
  - Drives PWM outputs safely when debugging