PIC18LF4220-I/ML - 8-bit PIC MCU, 4KB Flash, 44-QFN | Microchip
料号： PIC18LF4220-I/ML ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.76 | $576.00 |
| 500 | $5.18 | $2,590.00 |
| 1,000 | $4.61 | $4,610.00 |
PIC18LF4220-I/ML 概述
An 8-bit PIC microcontroller is a Harvard-architecture RISC device that fetches instructions and data through separate buses, allowing single-cycle instruction execution. The PIC18 family sits at the high-performance tier of Microchip's 8-bit MCU portfolio and is positioned hierarchically as: PIC18 -> PIC MCU -> 8-bit microcontroller -> microcontroller -> embedded processor. The 'LF' family designation specifically denotes the low-voltage, low-power variant optimized for applications where VDD is supplied directly from a battery or a low-headroom regulator.
Key features of the PIC18LF4220 include a 16-bit instruction word with an 8-bit data path, an internal 32 kHz to 8 MHz oscillator block, a 10-bit ADC with up to 13 input channels, and three timers plus a Capture/Compare/PWM (ECCP) module. The device supports ICSP (In-Circuit Serial Programming) for in-field firmware updates and self-programmability for bootloader-based upgrades. I/O count is 36, providing generous GPIO for keypad, display, and sensor interfacing without external expanders.
Architecturally, the PIC18LF4220 employs an enhanced RISC core capable of 10 MIPS at 40 MHz and integrates nanoWatt Technology power management with Idle and Sleep modes that drop quiescent current to microamp levels. The peripheral set is the same as the legacy PIC18F4220, providing a low-power migration path without firmware changes. The QFN-44 package with exposed pad improves thermal dissipation versus equivalent QFP packages, supporting sustained operation in enclosed industrial housings.
Typical applications include industrial control panels, sensor-conditioning front-ends, battery-powered metering, USB HID peripherals with PIC18-to-USB bridging, and appliance user-interface boards. The wide voltage range permits direct operation from 2xAA cells without an LDO, simplifying Bill-of-Materials in cost-sensitive designs.
Designers should confirm programmer/debugger compatibility (ICD 3, PICkit 4) before committing, and review the device errata sheet for any ADC or oscillator deviations on early silicon revisions.
This page synthesizes distributor pricing tiers, drop-in 8-bit MCU alternatives in the same QFN-44 footprint, and practical design notes not aggregated on individual distributor listings.
直接替换替代料： PIC18LF4220-I/ML ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18LF4220-I/ML （相同外形与封装尺寸） ——差异在于 Package, Timers, Core Architecture, ADC, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
PIC18LF4221-I/ML
✅ 直接替换✓ 有现货
$2.85 / 个
查看数据手册 →PIC18LF4320-I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF2320-I/ML
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC18LF4520-I/ML
✅ 直接替换✓ 有现货
$4.92 / 个
查看数据手册 →PIC18LF45K22-I/ML
✅ 直接替换✓ 有现货
$2.28 / 个
查看数据手册 →PIC18LF4220-I/ML 最大额定值与电气特性
| Core Architecture | 8-bit PIC18 RISC (Harvard) |
| Program Memory (Flash) | 4 KB |
| Data SRAM | 512 bytes |
| EEPROM | 256 bytes |
| Operating Voltage Range | 2.0 V to 5.5 V |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| Timers | 3 (Timer0/1/2/3 depending on config) |
| PWM Modules | 1 ECCP + 2 CCP |
| 封装 | 44-pin QFN with exposed thermal pad |
| Operating Temperature (Industrial) | -40 C to +85 C |
| 安装类型 | Surface Mount |
| MSL 等级 | 3 |
| RoHS 状态 | Compliant |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
PIC18LF4220-I/ML 引脚配置
| 引脚 1 | RA2/AN2 — PORTA I/O / Analog input |
| 引脚 2 | RA3/AN3/VREF+ — PORTA I/O / Analog input / ADC VREF+ |
| 引脚 3 | RA4/T0CKI — PORTA I/O / Timer0 clock |
| 引脚 4 | RA5/AN4/SS/HLVDIN — PORTA I/O / Analog / SPI SS / High/Low-Voltage detect |
| 引脚 5 | VDD — Positive supply voltage |
| 引脚 6 | VSS — Ground reference |
| 引脚 7 | OSC1/CLKI/RA7 — Crystal input / external clock in / PORTA I/O |
| 引脚 8 | OSC2/CLKO/RA6 — Crystal output / clock out / PORTA I/O |
| 引脚 9 | RC0/T1OSO/T1CKI — PORTC I/O / Timer1 oscillator |
| 引脚 10 | RC1/T1OSI/CCP2 — PORTC I/O / Timer1 oscillator / CCP2 |
| 引脚 11 | RC2/CCP1 — PORTC I/O / CCP1 PWM output |
| 引脚 12 | RC3/SCK/SCL — PORTC I/O / SPI SCK / I2C SCL |
| 引脚 13 | RC4/SDI/SDA — PORTC I/O / SPI SDI / I2C SDA |
| 引脚 15 | RC5/SDO — PORTC I/O / SPI SDO |
| 引脚 16 | RC6/TX/CK — PORTC I/O / USART TX / clock |
| 引脚 17 | RC7/RX/DT — PORTC I/O / USART RX / data |
| 引脚 18 | RB0/INT0/FLTA0 — PORTB I/O / External interrupt 0 |
| 引脚 19 | RB1/INT1 — PORTB I/O / External interrupt 1 |
| 引脚 20 | RB2/INT2 — PORTB I/O / External interrupt 2 |
| 引脚 21 | RB3/CCP2 — PORTB I/O / CCP2 module |
| 引脚 22 | NC — Not connected (per datasheet) |
| 引脚 23 | RB4 — PORTB I/O |
| 引脚 24 | RB5 — PORTB I/O |
| 引脚 25 | RB6/PGC — PORTB I/O / ICSP clock |
| 引脚 26 | RB7/PGD — PORTB I/O / ICSP data |
| 引脚 27 | RE0/RD/AN5 — PORTE I/O / Read control / analog |
| 引脚 28 | RE1/WR/AN6 — PORTE I/O / Write control / analog |
| 引脚 29 | RE2/CS/AN7 — PORTE I/O / Chip select / analog |
| 引脚 30 | VDD — Positive supply voltage |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | MCLR/VPP/RE3 — Master clear / Programming voltage / PORTE |
| 引脚 33 | RA0/AN0 — PORTA I/O / Analog input 0 |
| 引脚 34 | RA1/AN1 — PORTA I/O / Analog input 1 |
| 引脚 35 | VDD — Positive supply voltage |
| 引脚 36 | VSS — Ground reference |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | RD0/PSP0 — PORTD I/O / Parallel Slave Port |
| 引脚 39 | RD1/PSP1 — PORTD I/O / Parallel Slave Port |
| 引脚 40 | RD2/PSP2 — PORTD I/O / Parallel Slave Port |
| 引脚 41 | RD3/PSP3 — PORTD I/O / Parallel Slave Port |
| 引脚 42 | RD4/PSP4 — PORTD I/O / Parallel Slave Port |
| 引脚 43 | RD5/PSP5 — PORTD I/O / Parallel Slave Port |
| 引脚 44 | RD6/PSP6 — PORTD I/O / Parallel Slave Port |
| 引脚 EP | EP — Exposed thermal pad (solder to ground) |
典型应用
PIC18LF4220-I/ML 适用于 6 应用s: Industrial Sensor Conditioning, Battery-Powered Metering, Appliance User Interface Boards, USB HID Peripherals, Automotive Interior Modules, Educational and Hobby Development.
Industrial Sensor Conditioning
The PIC18LF4220-I/ML is well suited to industrial sensor-conditioning front-ends where 4KB Flash comfortably holds a state-machine scheduler and calibration table, while 2.0-5.5V VDD accepts a wide range of regulated rails. The 10-bit ADC with up to 13 input channels replaces an external ADC chip in compact designs, reducing BOM cost in PLC analog-input modules, process-transmitter heads, and field instrumentation. The QFN-44 footprint integrates cleanly onto mixed-signal sensor boards where the exposed pad is bonded to a ground pour for thermal stability. Use the ECCP module for PWM-driven excitation of resistive bridges, and capture mode for accurate pulse-width measurement of ultrasonic flow sensors.
推荐
Battery-Powered Metering
The 'LF' 2.0-5.5V VDD range qualifies the PIC18LF4220-I/ML for direct battery operation from 2xAA cells, eliminating an LDO in cost-sensitive metering designs. The nanoWatt Sleep mode drops quiescent current below 1 microamp, extending shelf and operational life across decade-long deployments. Designers use this combination in water meters, gas meters, and simple electricity meters where the PIC18LF4220 wakes on a Hall-effect pulse, accumulates counts in EEPROM, and logs once per day. The 4KB Flash holds a metering state machine plus tamper-detection logic without requiring external memory.
推荐
Appliance User Interface Boards
The PIC18LF4220-I/ML drives appliance HMI boards with 36 GPIO pins sufficient for keypad scanning, LED matrix control, and segment LCD multiplexing. The 3 CCP/ECCP channels deliver PWM for backlight dimming, buzzer tones, and triac-fired motor control in white-goods designs. Industrial (-40C to +85C) temperature rating supports under-hood appliance environments. Use the USART for service-port communication via opto-isolated UART, and the I2C/SPI for digital temperature sensor and EEPROM expansion.
推荐
USB HID Peripherals
Although the PIC18LF4220 itself lacks an integrated USB peripheral, Microchip's design ecosystem pairs it with the PIC18F2550 family for cost-optimized USB HID bridges. Designers use the PIC18LF4220 as a sub-MCU communicating with a USB-capable PIC via UART or SPI in compact peripherals. The 4KB Flash handles enumeration glue and HID report formatting, leaving the upstream USB PIC for protocol handling. This partitioned approach trades a few cents of BoM cost for proven USB stack stability.
推荐
Automotive Interior Modules
Although the standard PIC18LF4220-I/ML is industrial-grade (-40C to +85C), Microchip offers automotive-qualified variants of the PIC18 family for interior lighting, HVAC controls, and accessory switch modules. The QFN-44 footprint is automotive-vendor-accepted for behind-dash modules where vibration requires the exposed-pad mechanical robustness of QFN over QFP. Designers pair the MCU with CAN transceivers such as the MCP2515 for body-controller communication in non-safety-critical interior applications.
推荐
Educational and Hobby Development
The PIC18LF4220-I/ML is featured in Microchip's developer kits and university curricula, paired with PICkit 4 and MPLAB X IDE. The 4KB Flash and 36 GPIO provide sufficient complexity to teach interrupts, ADC pipelines, and PWM while remaining debuggable on a single weekend project. Hobbyists use it for retro gaming displays, robotic controllers, and homebrew synthesisers where the LF low-voltage compatibility simplifies portable, battery-driven constructions.
推荐
推荐产品汇总
工程参考数据： PIC18LF4220-I/ML ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18LF4221-I/ML | PIC18LF4320-I/ML | PIC18LF4520-I/ML | PIC18LF45K22-I/ML |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin QFN with EP (ML) | 44-pin QFN with EP (ML) - same | 44-pin QFN with EP (ML) - same | 44-pin QFN with EP (ML) - same | 44-pin QFN with EP (ML) - same |
| Flash Memory | 4 KB | 64 KB | 8 KB | 32 KB | 32 KB |
| SRAM | 512 bytes | 4 KB | 768 bytes | 1.5 KB | 1.5 KB |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V (NOT drop-in for battery) | 2.0 V to 5.5 V |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 64 MHz (16 MIPS) |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
| Architecture Series | PIC18F legacy | PIC18F legacy | PIC18F legacy | PIC18F legacy | PIC18 K-series (enhanced) |
关键差异点
- Wide 2.0V-5.5V VDD eliminates external LDO on battery designs （对比 PIC18F4220 (standard-voltage legacy))
- 16x memory upgrade path in same QFN-44 footprint （对比 PIC18LF4221-I/ML)
- Enhanced K-series core option with 60% more MIPS （对比 PIC18LF45K22-I/ML)
设计说明
The PIC18LF4220-I/ML accepts a wide 2.0V-5.5V VDD range, but bulk decoupling still requires a 100nF ceramic cap within 5mm of each VDD pin and a 10uF tantalum or ceramic bulk cap near the regulator output. Place the bulk cap first in the power-trace path to minimize voltage droop during CCP PWM transitions where peak currents spike 50-100mA above baseline. Avoid using VDD pin pairs (5/30/35 in this package) as power-ground returns for analog signals to prevent digital switching noise coupling.
A common engineering pitfall: do not enter ICSP programming mode with a fully discharged decoupling network. Always ensure VDD rises within the tVTP time window per datasheet, otherwise the MCLR/VPP pin may latch and the ICSP handshake will fail intermittently. Additionally, the exposed thermal pad (EP) must be soldered to a ground pour for package mechanical reliability - omitting the EP solder connection risks reflow-induced package cracking on thermal cycling.
Estimated: At 40 MHz CPU clock with 36 GPIO toggling at 25% duty, peak ground-bounce noise on a 4-layer PCB with a 5mm x 5mm ground pour is roughly 150-250 mV; a 6-layer stackup reduces this by 30-50%. Place the crystal oscillator traces (OSC1/OSC2) within 5mm of the package, keep them matched-length within 1mm, and guard them with a ground trace on each side. The ICSP PGC/PGD lines should be routed with a 4.7k pull-up on MCLR and a 100-ohm series terminator near the connector.
合规信息
RoHS compliant per Microchip product declaration; lead-free NiPdAu plating. Industrial -40C to +85C temperature range. Not AEC-Q100 qualified - choose automotive-grade PIC18F variants for AEC-Q100 compliance.
