PIC18LF45K50-E/PT - 8-bit 48MHz 32KB Flash MCU | Microchip
MPN： PIC18LF45K50-E/PT ✓ 啟用中PIC18LF45K50-E/PT 概覽
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash), data memory (RAM), and peripherals on one die. The PIC18F/LF family uses an enhanced Harvard RISC architecture with 16-bit instructions and 8-bit data paths, positioning it between simple 8-bit controllers (PIC10/12/16) and 16-bit dsPIC or 32-bit ARM Cortex-M devices in Microchip's portfolio. The 'F' (Flash) and 'LF' (Low-Voltage Flash) variants differentiate only by operating voltage range.
Key features include 32KB (16K x 16) Flash program memory, 2KB SRAM, 256B EEPROM, 36 digital I/O pins, a 10-bit ADC with 25 channels, two 8-bit timers plus three 16-bit timers, two comparators, two CCP modules, and an enhanced USART. The integrated USB 2.0 full-speed transceiver with on-chip 3.3V regulator eliminates the need for external USB components, making this MCU ideal for USB peripherals on battery power.
Architecturally, the PIC18LF45K50 uses a 16-bit instruction word with an 8-bit data bus, an 8-level hardware stack, and a single-cycle hardware multiplier. The 48MHz internal oscillator provides 12 MIPS performance with ±1% accuracy across voltage and temperature. XLP technology enables sleep currents below 50 nA, watchdog timer currents under 400 nA, and peripheral functions while drawing microamps.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), battery-powered data loggers, USB-to-UART bridges, environmental sensor nodes, and consumer electronics with USB connectivity. The combination of integrated USB and XLP makes it particularly attractive for self-powered USB devices drawing power from the bus only when active.
When designing with this device, ensure the VUSB pin has a 220 nF decoupling capacitor and the D+/D- lines use 90Ω differential impedance. The internal 3.3V USB regulator requires a 10µF bulk capacitor on the VUSB3V3 pin. For bus-powered designs, total current draw must remain below 100 mA (low-power) or 500 mA (high-power) per USB specifications.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
直接替換替代品，適用於 PIC18LF45K50-E/PT — 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： PIC18LF45K50-E/PT （相同外形與佔位） — 差異在於 Operating Temperature, Package, ADC, Communication, Comparators.
PIC18F45K50-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18LF45K50-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF45K40-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18LF45K22-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC18LF45K42-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC18LF45K50-E/PT 最大額定值與電氣特性
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC® XLP™ 18K |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 2 KB |
| EEPROM | 256 B |
| Maximum CPU Frequency | 48 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V (LF variant) |
| 工作溫度 | -40 C to +125 C (E = Extended) |
| I/O Pins | 36 |
| ADC | 10-bit, 25 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Comparators | 2 |
| CCP Modules | 2 |
| Communication | USB 2.0 FS, EUSART, I2C, SPI |
| 封裝 | 44-pin TQFP (10x10 mm) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
PIC18LF45K50-E/PT 腳位配置
| 腳位 1 | RC6/TX/CK — Digital I/O / EUSART TX / I2C clock |
| 腳位 2 | RC7/RX/DT — Digital I/O / EUSART RX / I2C data |
| 腳位 3 | RE0 — Digital I/O (Port E bit 0) |
| 腳位 4 | RE1 — Digital I/O (Port E bit 1) |
| 腳位 5 | RE2 — Digital I/O (Port E bit 2) |
| 腳位 6 | VDD — Positive power supply |
| 腳位 7 | VSS — Ground reference |
| 腳位 8 | VUSB3V3 — USB internal 3.3V regulator output (decouple 10uF) |
| 腳位 9 | RA0/AN0 — Digital I/O / ADC input 0 |
| 腳位 10 | RA1/AN1 — Digital I/O / ADC input 1 |
| 腳位 11 | RA2/AN2 — Digital I/O / ADC input 2 |
| 腳位 12 | RA3/AN3 — Digital I/O / ADC input 3 |
| 腳位 13 | RA4/AN4 — Digital I/O / ADC input 4 |
| 腳位 14 | RA5/AN5 — Digital I/O / ADC input 5 |
| 腳位 15 | RE3 — Digital input only (Port E bit 3) |
| 腳位 16 | OSC1/CLKIN — Crystal oscillator input / external clock |
| 腳位 17 | OSC2/CLKOUT — Crystal oscillator output |
| 腳位 18 | RC0 — Digital I/O (Port C bit 0) |
| 腳位 19 | RC1 — Digital I/O (Port C bit 1) |
| 腳位 20 | RC2 — Digital I/O (Port C bit 2) |
| 腳位 21 | RC3 — Digital I/O (Port C bit 3) |
| 腳位 22 | RC4/D- — Digital I/O / USB D- (alternate pin) |
| 腳位 23 | RC5/D+ — Digital I/O / USB D+ (alternate pin) |
| 腳位 24 | RC6 — Digital I/O (Port C bit 6) |
| 腳位 25 | RC7 — Digital I/O (Port C bit 7) |
| 腳位 26 | RB0/AN12 — Digital I/O / ADC input 12 / interrupt-on-change |
| 腳位 27 | RB1/AN10 — Digital I/O / ADC input 10 |
| 腳位 28 | RB2/AN8 — Digital I/O / ADC input 8 |
| 腳位 29 | RB3/AN9 — Digital I/O / ADC input 9 |
| 腳位 30 | RB4/AN11 — Digital I/O / ADC input 11 |
| 腳位 31 | RB5/AN13 — Digital I/O / ADC input 13 |
| 腳位 32 | RB6/ICSPCLK — Digital I/O / ICSP clock / ICD clock |
| 腳位 33 | RB7/ICSPDAT — Digital I/O / ICSP data / ICD data |
| 腳位 34 | VUSB — USB voltage sense input (decouple 220nF) |
| 腳位 35 | RD0 — Digital I/O (Port D bit 0) |
| 腳位 36 | RD1 — Digital I/O (Port D bit 1) |
| 腳位 37 | RD2 — Digital I/O (Port D bit 2) |
| 腳位 38 | RD3 — Digital I/O (Port D bit 3) |
| 腳位 39 | RD4 — Digital I/O (Port D bit 4) |
| 腳位 40 | RD5 — Digital I/O (Port D bit 5) |
| 腳位 41 | RD6 — Digital I/O (Port D bit 6) |
| 腳位 42 | RD7 — Digital I/O (Port D bit 7) |
| 腳位 43 | VSS — Ground reference |
| 腳位 44 | VDD — Positive power supply |
典型應用
PIC18LF45K50-E/PT 適用於 6 應用s: USB HID Peripheral Devices, USB-to-UART Bridge / CDC Device, Battery-Powered Data Logger, USB Sensor Node / IoT Endpoint, Custom USB Test & Measurement Instrument, Consumer USB Charging / Power Bank Controller.
USB HID Peripheral Devices
The PIC18LF45K50-E/PT is purpose-built for USB Human Interface Device (HID) peripherals such as keyboards, mice, game controllers, custom input panels, and barcode scanners. Its integrated USB 2.0 full-speed transceiver with on-chip 3.3V regulator eliminates external USB components, reducing BOM cost and PCB area. The 32KB Flash comfortably fits Microchip's free USB HID stack plus application logic, while XLP sleep currents below 50 nA extend battery life in wireless HID dongles. At 48MHz/12 MIPS, the MCU handles HID report processing, debouncing, and LED/indicator updates without CPU bottlenecks.
推薦
USB-to-UART Bridge / CDC Device
The PIC18LF45K50-E/PT serves as a USB-to-serial bridge using the CDC (Communications Device Class) profile, replacing bulky RS-232 cables with USB. Its integrated USB transceiver plus EUSART peripheral provides a two-chip USB-to-UART solution (the PIC plus a MAX3232 level shifter for legacy RS-232, or a direct TTL UART for 3.3V targets). The 48MHz CPU handles USB enumeration and UART data without flow control, and 2KB RAM accommodates USB packet buffers. Firmware updates via USB DFU simplify field upgrades.
推薦
Battery-Powered Data Logger
The PIC18LF45K50-E/PT's XLP (eXtreme Low Power) technology makes it ideal for battery-powered data loggers measuring temperature, humidity, pressure, or vibration. Sleep currents below 50 nA and ADC operation under 1 µA enable multi-year battery life from a single CR2032 coin cell. The 25-channel 10-bit ADC supports multiple sensors via a multiplexer, while 2KB RAM buffers thousands of samples between USB data transfers. The integrated USB enables direct PC download without an external programmer, simplifying field retrieval.
推薦
USB Sensor Node / IoT Endpoint
The PIC18LF45K50-E/PT powers USB-connected IoT sensor endpoints that draw power from the bus and report environmental data via HID or vendor-class USB. Its combination of integrated USB, 25-channel ADC, and XLP low-power modes enables self-powered or bus-powered sensor designs without external regulators. The 48MHz CPU runs lightweight protocol stacks (vendor-class USB, custom HID reports) while the integrated peripherals handle sensor I/O, PWM fan control, or LED status indicators. Compatible with Raspberry Pi and PC USB host stacks via standard drivers.
推薦
Custom USB Test & Measurement Instrument
The PIC18LF45K50-E/PT is well-suited for low-cost USB test instruments such as logic analyzers (limited channels), signal generators, or simple oscilloscope front-ends. Its 48MHz/12 MIPS performance samples up to ~1 MSPS via the 10-bit ADC (with software averaging), while the integrated USB streams data to the host PC at 12 Mbps. The 32KB Flash fits USB isochronous or bulk transfer firmware plus custom measurement routines. 2KB RAM buffers samples between USB transfers, enabling continuous waveform capture.
推薦
Consumer USB Charging / Power Bank Controller
The PIC18LF45K50-E/PT can implement a USB-based smart charging controller or low-power power bank with status reporting over USB. Its ADC monitors battery voltage and current, the CCP modules drive PWM-controlled charging FETs, and the integrated USB reports state-of-charge to the host. The 1.8-3.6V LF voltage range directly supports single-cell Li-ion/polymer batteries without a boost regulator. Sleep currents below 1 µA preserve shelf life during storage.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF45K50-E/PT — 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 | PIC18F45K50-I/PT | PIC18LF45K50-I/PT | PIC18LF45K40-I/PT | PIC18LF45K42-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (10x10) | 44-pin TQFP (10x10) - same | 44-pin TQFP (10x10) - same | 44-pin TQFP (10x10) - same | 44-pin TQFP (10x10) - same |
| Operating Voltage | 1.8V to 3.6V | 2.0V to 5.5V | 1.8V to 3.6V - same | 1.8V to 3.6V - same | 1.8V to 3.6V - same |
| Flash Memory | 32 KB | 32 KB - same | 32 KB - same | 16 KB (-50%) | 32 KB - same |
| Integrated USB | USB 2.0 Full-Speed | USB 2.0 Full-Speed - same | USB 2.0 Full-Speed - same | No | No |
| ADC Resolution | 10-bit | 10-bit - same | 10-bit - same | 10-bit - same | 12-bit (+20%) |
| Operating Temperature | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
主要差異化特點
- Integrated USB 2.0 Full-Speed transceiver with on-chip 3.3V regulator (對比PIC18LF45K40-I/PT)
- 32KB Flash with full HID/CDC USB framework support (對比PIC18LF45K22-I/PT)
- Wide 1.8V-3.6V LF operating range for battery-powered designs (對比PIC18F45K50-I/PT)
設計說明
The PIC18LF45K50-E/PT has two distinct power domains: VDD (1.8-3.6V main logic) and VUSB3V3 (USB transceiver 3.3V regulated output). Place a 10µF ceramic capacitor on VUSB3V3 and a 220nF capacitor on VUSB to satisfy USB spec requirements. When bus-powered, total device current (including USB enumeration) must remain below 100mA for low-power or 500mA for high-power configurations per USB 2.0 specification.
For USB 2.0 full-speed compliance, route D+ and D- as a 90Ω differential pair with characteristic impedance matching the USB spec. Keep trace length under 50mm and avoid stubs. Place the VUSB3V3 decoupling capacitor (10µF) and VUSB capacitor (220nF) within 5mm of their respective pins. The 48MHz internal oscillator eliminates the need for an external crystal in most designs, freeing two pins.
Do not apply voltages above 3.6V to VDD on the 'LF' variant - this will damage the part. Use the 'F' (non-LF) variant for 5V systems. The internal 3.3V USB regulator cannot supply external loads beyond a few mA. For ICSP programming, ensure PGC/PGD pins (RB6/RB7) are not overloaded with external capacitance greater than 30pF, as this can prevent reliable programming.
The internal 48MHz oscillator provides ±1% accuracy across voltage and temperature - sufficient for UART baud rates up to 115200 and USB full-speed operation. For timing-critical applications, the PLL can synthesize 96MHz from the 48MHz oscillator for use by the USB module. If using an external crystal, place load capacitors within 3-5mm of the OSC1/OSC2 pins and guard the traces with a ground pour to prevent noise coupling.
合規資訊
RoHS and REACH compliant per Microchip product documentation. The /PT suffix indicates lead-free TQFP packaging. AEC-Q100 qualification not available for this part; automotive applications should use qualified variants. Halogen-free mold compound per Microchip environmental compliance data.