PIC18LF45K22-E/ML - 8-bit 48MHz 32KB Flash MCU | Microchip
MPN： PIC18LF45K22-E/ML ✓ 啟用中PIC18LF45K22-E/ML 概覽
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, Flash program memory, RAM, EEPROM, and a rich set of digital and analog peripherals into one package. MCUs sit at the top of the embedded device hierarchy: they are descendants of microprocessors that have absorbed nearly every supporting component, becoming self-contained 'system on chip' building blocks for embedded products. The PIC18LF45K22 belongs to the PIC18 family, which targets low-power and high-pin-count applications.
Key features include nanoWatt XLP sleep currents below 100 nA, two Enhanced USART modules for simultaneous serial communication, two MSSP peripherals supporting both I2C and SPI, a 12-bit A/D converter with up to 28 channels, multiple 16-bit timers, and CTMU charge-time measurement for capacitive touch. The device also integrates a 64 MHz internal oscillator, programmable reference and comparator modules, and self-programming Flash for bootloader designs.
Typical applications include low-power battery sensors, USB-less human-interface panels, HVAC controls, industrial data loggers, and capacitive-touch front panels where the CTMU simplifies the touch firmware. Designers also use it in portable medical accessories, e-metering, and home appliances.
When designing with the PIC18LF45K22-E/ML, place the VDD/VSS bulk and bypass capacitors within 5 mm of the pins and reserve the exposed pad (EP) for thermal and ground connection. Verify your compiler is MPLAB XC8-aware and that your programmer supports ICSP on the four-pin PGx/PGC/PGD/MCLR interface.
This page consolidates distributor pricing, parameter-matched drop-in alternatives, and practical design notes for the PIC18LF45K22-E/ML that go beyond what is in the Microchip datasheet. All cross-references, current pricing, and lifecycle signals were re-verified on 2026-09-29.
直接替換替代品，適用於 PIC18LF45K22-E/ML — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF45K22-E/ML （相同外形與佔位） — 差異在於 Package, ADC, Program Memory (Flash), Timers, Core.
PIC18LF46K22-E/ML
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18F45K22-E/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF45K22-I/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC18F46K22-E/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF45K40-E/ML
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF44K22-E/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF45K22-E/ML 最大額定值與電氣特性
| Product Family | PIC18F/LF K22 series |
| Core | 8-bit PIC18 RISC |
| Maximum CPU Frequency | 48 MHz (16 MIPS) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Supply Voltage (VDD) | 1.8 V to 3.6 V |
| 工作溫度 | -40C to +125C (E = extended) |
| 封裝 | 44-lead QFN (ML) 8x8 mm with EP |
| ADC | 12-bit, multi-channel |
| Communication | 2x EUSART (UART), 2x MSSP (I2C/SPI) |
| Timers | Multiple 8/16-bit timers |
| Low-Power Technology | nanoWatt XLP |
| Special Features | CTMU, internal oscillator, self-programming Flash |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
PIC18LF45K22-E/ML 44-lead qfn (ml) 8x8 mm with ep 腳位配置指南
PIC18LF45K22-E/ML（44-lead qfn (ml) 8x8 mm with ep 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： PIC18LF45K22-E/ML.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC18LF45K22-E/ML 適用於 6 應用s: Battery-Powered Wireless Sensor Nodes, Industrial HVAC and Building Controls, Capacitive-Touch Front Panels, Portable Medical Accessories, Electronic Metering and Data Loggers, Home Appliance User Interface Boards.
Battery-Powered Wireless Sensor Nodes
The PIC18LF45K22-E/ML is well suited to battery-powered wireless sensor nodes because its nanoWatt XLP sleep currents drop below 100 nA and its 1.8 V to 3.6 V wide-voltage core lets it run directly from a single Li-ion cell down to cutoff. With 32 KB of Flash and 1.5 KB of RAM, it can host a small protocol stack and a sensor driver without external memory. Place the part in sleep between measurements and wake on an MSSP-interrupt or RTCC alarm to extend battery life from months to years.
推薦
Industrial HVAC and Building Controls
The PIC18LF45K22-E/ML fits HVAC and building-automation controls because its 12-bit ADC delivers accurate temperature and pressure readings, the extended -40C to +125C grade survives mechanical-room environments, and the dual EUSART plus dual MSSP support simultaneous Modbus and sensor-bus traffic. The 44-pin QFN package keeps the PCB small enough for wall-mount thermostats and the K22 peripheral set includes the PWM module needed for triac-fired heater control.
推薦
Capacitive-Touch Front Panels
The PIC18LF45K22-E/ML simplifies capacitive-touch front-panel designs because the integrated CTMU (Charge-Time Measurement Unit) measures capacitance directly, removing the need for an external touch controller. With up to 28 ADC channels and 36+ I/O pins, a single chip can scan a 4x4 keypad plus slider, while nanoWatt XLP keeps the always-on touch-wake current negligible. The 32 KB Flash easily holds a touch library plus the application UI code in one image.
推薦
Portable Medical Accessories
The PIC18LF45K22-E/ML works well in portable medical accessories because the nanoWatt XLP technology supports long battery life and the 12-bit ADC provides sufficient resolution for pulse-oximetry, temperature, and pressure-sensor signal chains. The 1.8 V to 3.6 V core aligns with single-cell Li-ion chemistries used in patient wearables, and the 44-pin QFN allows a small, sealed enclosure. The internal 64 MHz oscillator removes the need for an external crystal in many designs, improving reliability.
推薦
Electronic Metering and Data Loggers
The PIC18LF45K22-E/ML is a strong fit for electronic metering and data-logger designs because its 256-byte EEPROM survives power cycles for tariff or calibration data, and the 32 KB Flash stores up to 30 days of timestamped consumption logs at 15-minute intervals. The dual EUSART enables simultaneous Modbus master and slave ports for sub-metering networks, while nanoWatt XLP keeps standby draw below the metering spec limit. The 44-pin QFN supports a tamper-resistant SMD layout.
推薦
Home Appliance User Interface Boards
The PIC18LF45K22-E/ML drives home-appliance UI boards because its 44-pin QFN footprint provides enough I/O for segmented LCD or LED indicators plus button matrices, and the CTMU simplifies capacitive control buttons on washer, oven, and dishwasher panels. The extended temperature grade tolerates oven-cabinet heat, while the MSSP peripherals connect to off-board Wi-Fi or BLE modules for app-controlled appliances. The 32 KB Flash fits the appliance state-machine plus a small safety-monitoring task.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF45K22-E/ML — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18LF46K22-E/ML | PIC18F45K22-E/ML | PIC18LF45K22-I/ML | PIC18F46K22-E/ML | PIC18LF45K40-E/ML |
|---|---|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) ML | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 64 KB | 32 KB | 32 KB | 64 KB | 32 KB |
| RAM | 1.5 KB | 3.8 KB | 1.5 KB | 1.5 KB | 3.8 KB | 2 KB |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.0 V to 5.5 V | 1.8 V to 3.6 V | 2.0 V to 5.5 V | 1.8 V to 3.6 V |
| Operating Temperature | -40C to +125C (E) | -40C to +125C (E) | -40C to +125C (E) | -40C to +85C (I) | -40C to +125C (E) | -40C to +125C (E) |
| Maximum CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Low-Power XLP Sleep | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) | Yes (nanoWalt XLP) | Yes (nanoWatt XLP) |
主要差異化特點
- Wide-voltage 1.8 V to 3.6 V core for single-cell Li-ion battery operation (對比PIC18F45K22-E/ML)
- NanoWatt XLP sleep current below 100 nA (對比PIC18LF25K22-I/SO)
- Extended -40C to +125C temperature grade in a compact QFN-44 (對比PIC18LF45K22-I/ML)
設計說明
Solder the exposed thermal pad (EP) of the 44-pin QFN to a continuous ground plane with at least 6 thermal vias to the inner ground layer. Place the VDD/VSS bulk (10 uF) and bypass (0.1 uF) capacitors within 5 mm of their respective pins. The QFN lead frame requires PCB land pattern extensions matching the Microchip package drawing; non-soldered EP will derate the thermal performance by 30 percent and may cause thermal-shutdown under heavy ADC and PWM load.
Use the nanoWatt XLP sleep modes (Sleep, Idle, Doze) whenever the application can pause the CPU. With the RTCC running from its 32 kHz source and the MSSP/I/O pins configured to wake on edge interrupts, total sleep current drops below 100 nA at 3.0 V. Estimated: based on datasheet typical curves at room temperature, this enables a 600 mAh CR2032 to power a 1 Hz sample loop for more than 5 years. Brown-out and low-voltage detect settings must be configured to match the chosen VDD range to avoid spurious resets.
Do not connect the MCLR pin directly to VDD without a pull-up; the PIC18 K22 family requires MCLR to be high for normal operation and only low for reset. Use the internal weak pull-up by enabling the MCLRE configuration bit, or place an external 10 kohm pull-up to VDD. Do not drive PGC/PGD (ICSP) lines with any external source during programming, or the in-circuit serial programmer will fail to handshake. Confirm CONFIG words in code match the target voltage range or the part will not start up at 1.8 V.
合規資訊
RoHS and REACH compliance per Microchip product page; not AEC-Q100 qualified (industrial/consumer grade); lead-free reflow profile per JEDEC J-STD-020.
