Description
The PIC18LF4220 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. On top of these features, the PIC18F4220 family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power sensitive applications.All of the devices in the PIC18F4220 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 power-managed 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 1.8 and 2.2µA, respectively.All of the devices in the PIC18F4220 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 a 31 kHz INTRC clock and an 8 MHz clock with 6 program selectable divider ratios (4 MHz to 125 kHz) for a total of 8 clock frequencies.Besides its availability as a clock source, the internal oscillator block provides a stable reference source that gives the family additional features for robust operation: 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. Two-Speed Start-up: This option allows the internal oscillator to serve as the clock source from Power-on Reset, or wake-up from Sleep mode, until the primary clock source is available. This allows for code execution during what would otherwise be the clock start-up interval and can even allow an application to perform routine background activities and return to Sleep without returning to full power operation.Memory Endurance: The Enhanced Flash cells for both program memory and data EEPROM are rated to last for many thousands of erase/write cycles – up to 100,000 for program memory and 1,000,000 for EEPROM. Data retention without refresh is conservatively estimated to be greater than 40 years Self-Programmability: These devices can write to their own program memory spaces under internal software control. By using a bootloader routine located in the protected Boot Block at the top of program memory, it becomes possible to create an application that can update itself in the field. Enhanced CCP Module: In PWM mode, this module provides 1, 2 or 4 modulated outputs for controlling half-bridge and full-bridge drivers.
- Low-Power Features:
- Power-Managed modes:
- Run: CPU on, peripherals on
- Idle: CPU off, peripherals on
- Sleep: CPU off, peripherals off
- Power Consumption modes:
- PRI_RUN: 150 µA, 1 MHz, 2V
- PRI_IDLE: 37 µA, 1 MHz, 2V
- SEC_RUN: 14 µA, 32 kHz, 2V
- SEC_IDLE: 5.8 µA, 32 kHz, 2V
- RC_RUN: 110 µA, 1 MHz, 2V
- RC_IDLE: 52 µA, 1 MHz, 2V
- Sleep: 0.1 µA, 1 MHz, 2V
- Timer1 Oscillator: 1.1 µA, 32 kHz, 2V
- Watchdog Timer: 2.1 µA
- Two-Speed Oscillator Start-up Oscillators:
- Four Crystal modes:
- LP, XT, HS: up to 25 MHz
- HSPLL: 4-10 MHz (16-40 MHz internal)
- Two External RC modes, Up to 4 MHz
- Two External Clock modes, Up to 40 MHz
- Internal Oscillator Block:
- 8 user-selectable frequencies: 31 kHz, 125 kHz, 250 kHz, 500 kHz, 1 MHz, 2 MHz, 4 MHz, 8 MHz
- 125 kHz-8 MHz calibrated to 1%
- Two modes select one or two I/O pins
- OSCTUNE Allows user to shift frequency
- Secondary Oscillator using Timer1 @ 32 kHz
- Fail-Safe Clock Monitor
- Allows for safe shutdown if peripheral clock stops
- Peripheral Highlights:
- High-Current Sink/Source 25 mA/25 mA
- Three External Interrupts
- Up to 2 Capture/Compare/PWM (CCP) modules:
- Capture is 16-bit, max. resolution is 6.25 ns (TCY/16)
- Compare is 16-bit, max. resolution is 100 ns (TCY)
- PWM output: PWM resolution is 1 to 10-bit
- Enhanced Capture/Compare/PWM (ECCP) module:
- One, two or four PWM outputs
- Selectable polarity
- Programmable dead time
- Auto-Shutdown and Auto-Restart
- Compatible 10-Bit, Up to 13-Channel Analog-to-Digital Converter (A/D) module with Programmable Acquisition Time
- Dual Analog Comparators
- Addressable USART module:
- 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: > 40 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
- 2% stability over VDD and Temperature
- Single-Supply 5V In-Circuit Serial Programmingô (ICSPô) via Two Pins
- In-Circuit Debug (ICD) via Two Pins
- Wide Operating Voltage Range: 2.0V to 5.5V
