
PIC18F2331/2431/4331/4431

28/40/44-Pin Enhanced Flash Microcontrollers with
nanoWatt Technology, High Performance PWM and A/D

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
• Idle mode currents down to 5.8 µA typical
• Sleep current down to 0.1 µA typical
• Timer1 oscillator, 1.8 µA typical, 32 kHz, 2V
• Watchdog Timer (WDT), 2.1 µA typical
• Two-Speed oscillator start-up

Peripheral Highlights:

• High current sink/source 25 mA/25 mA
• Three external interrupts
• Two Capture/Compare/PWM (CCP) modules:
  - Capture is 16-bit, max. resolution 6.25 ns (TCY/16)
  - Compare is 16-bit, max. resolution 100 ns (TCY)
  - PWM output: PWM resolution is 1 to 10 bits
• Enhanced USART module:
  - Supports RS-485, RS-232 and LIN 1.2
  - Auto-Wake-up on Start bit
  - Auto-Baud detect
• RS-232 operation using internal oscillator block
  (no external crystal required)

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
