Description
PIC18LF4331 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. These special peripherals include: 14-Bit Resolution Power Control PWM module (PCPWM) with Programmable Dead-Time Insertion Motion Feedback Module (MFM), including a 3-Channel Input Capture (IC) module and Quadrature Encoder Interface (QEI) High-Speed 10-Bit A/D Converter (HSADC) The PCPWM can generate up to eight complementary PWM outputs with dead-band time insertion. Overdrive current is detected by off-chip analog comparators or the digital Fault inputs (FLTA, FLTB) The MFM Quadrature Encoder Interface provides precise rotor position feedback and/or velocity measurement. The MFM 3x input capture or external interrupts can be used to detect the rotor state for electrically commutated motor applications using Hall sensor feedback, such as BLDC motor drives PIC18F2331/2431/4331/4431 devices also feature Flash program memory and an internal RC oscillator with built-in LP modes All of the devices in the PIC18F2331/2431/4331/4431 family incorporate a range of features that can significantly reduce power consumption during operation Alternate Run Modes: By clocking the controller from the Timer1 source or the internal oscillator block, power consumption during code execution can be reduced by as much as 90% Multiple Idle Modes: The controller can also run with its CPU core disabled, but the peripherals are still active. In these states, power consumption can be reduced even further, to as little as 4% of normal operation requirements On-the-Fly Mode Switching: The powermanaged modes are invoked by user code during operation, allowing the user to incorporate power-saving ideas into their application’s software design Lower Consumption in Key Modules: The power requirements for both Timer1 and the Watchdog Timer have been reduced by up to 80%, with typical values of 1.1 and 2.1 µA, respectively. All of the devices in the PIC18F2331/2431/4331/4431 family offer nine different oscillator options, allowing users a wide range of choices in developing application hardware. These include: Four Crystal modes, using crystals or ceramic resonators. Two External Clock modes, offering the option of using two pins (oscillator input and a divide-by-4 clock output) or one pin (oscillator input, with the second pin reassigned as general I/O). Two External RC Oscillator modes, with the same pin options as the External Clock modes. An internal oscillator block, which provides an 8 MHz clock and an INTRC source (approximately 31 kHz, stable over temperature and VDD), as well as a range of 6 user-selectable clock frequencies (from 125 kHz to 4 MHz) for a total of 8 clock frequencies. A Phase Lock Loop (PLL) frequency multiplier, available to both the High-Speed Crystal and Internal Oscillator modes, which allows clock speeds of up to 40 MHz. Used with the internal oscillator, the PLL gives users a complete selection of clock speeds, from 31 kHz to 32 MHz – all without using an external crystal or clock circuit Fail-Safe Clock Monitor: This option constantly monitors the main clock source against a reference signal provided by the internal oscillator. If a clock failure occurs, the controller is switched to the internal oscillator block, allowing for continued low-speed operation or a safe application shutdown
- 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 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
- Oscillator Two-Speed Start-up
- Fast wake from Sleep and Idle, 1 µs, 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
