PIC18LF4450-I/ML - 48MHz 8-bit USB MCU, 16KB Flash, 44-QFN | Microchip
MPN: PIC18LF4450-I/ML ✓ Hoạt độngPIC18LF4450-I/ML Tóm tắt
An 8-bit microcontroller (MCU) is a self-contained compute subsystem on a single silicon die, integrating a CPU core, non-volatile program memory (Flash), volatile data memory (SRAM), digital peripherals (timers, UART, I2C, SPI, USB) and general-purpose I/O. The PIC18 family is the high-performance tier of Microchip's 8-bit MCU line, sitting above PIC10/12/16 in peripheral richness and instruction throughput. The LF sub-family trades absolute speed headroom for wider operating-voltage range and nanoWatt sleep modes, making it a fit for battery- and bus-powered edge devices.
Key features include 10-bit ADC with up to 13 input channels, three counter/timers, a Capture/Compare/PWM module, an Enhanced USART (EUSART, LIN-capable), Master I2C and SPI (up to 10 Mbit/s), the Full-Speed USB 2.0 transceiver with on-chip SIE, and Microchip's nanoWatt power-management block with Idle, Sleep and deep-sleep modes. The 44-QFN (ML) package exposes 34 general-purpose I/O lines plus dedicated USB D+/D- pads, VUSB and the internal 3.3V USB regulator.
Architecturally the PIC18LF4450 implements an enhanced Harvard RISC core with 16-bit instructions, a hardware multiplier (8x8 single-cycle) and a 31-level deep stack. The integrated USB SIE handles packet framing, CRC and the physical-layer signaling so the CPU is freed from bit-banging, dramatically lowering firmware complexity for HID, CDC and vendor-class USB applications.
Typical applications include USB HID peripherals (keyboards, mice, custom joysticks), USB-to-UART bridges, low-power sensor nodes with USB charging, industrial data loggers, LIN slave nodes in automotive body controllers, and educational/development boards. The wide 2.0-5.5 V range lets the device run directly from a single Li-ion cell, two AA cells, or a 3.3 V regulated rail.
When designing with this part, observe the PCB layout rules in Microchip AN233 (USB PCB layout) - the D+/D- traces must be 90 ohm differential, matched-length, and the VUSB decoupling capacitor must be within 5 mm of the VUSB pin. For self-powered designs, the internal 3.3 V USB regulator can be disabled via CONFIG and an external rail supplied to the VUSB pin.
This page synthesizes current distributor pricing, drop-in same-package alternatives, and practical layout notes that go beyond the datasheet to speed USB-MCU bring-up.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4450-I/ML — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC18LF4450-I/ML (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, ADC, I/O Pins, Communication Peripherals.
PIC18F4550-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4450-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4455-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F2550-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F46K40-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4450-I/ML Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data Memory (SRAM) | 768 B |
| EEPROM | 256 B |
| Maximum CPU Clock | 48 MHz (12 MIPS) |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 13 channels |
| USB | USB 2.0 Full-Speed (12 Mbit/s) with on-chip SIE |
| Timers | 3 (Timer0/1/2) + 1 CCP |
| Communication Peripherals | EUSART (LIN-capable), I2C (Master), SPI (up to 10 Mbit/s) |
| Hộp | 44-pin QFN (ML) 8x8 mm with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial, "I") |
| Power-Saving Modes | nanoWatt: Idle, Sleep, Deep Sleep, Run |
Cấu hình chân PIC18LF4450-I/ML
| Chân 1 | RC2/CCP1 — I/O port C bit 2 / Capture Compare PWM 1 |
| Chân 2 | VSS — Ground reference |
| Chân 3 | RA0/AN0 — I/O port A bit 0 / analog input 0 |
| Chân 4 | RA1/AN1 — I/O port A bit 1 / analog input 1 |
| Chân 5 | RA2/AN2 — I/O port A bit 2 / analog input 2 |
| Chân 6 | RA3/AN3 — I/O port A bit 3 / analog input 3 |
| Chân 7 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Chân 8 | RA5/AN4 — I/O port A bit 5 / analog input 4 |
| Chân 9 | RE0 — I/O port E bit 0 |
| Chân 10 | RE1 — I/O port E bit 1 |
| Chân 11 | RE2 — I/O port E bit 2 |
| Chân 12 | VDD — Positive supply (2.0-5.5 V) |
| Chân 13 | OSC1/CLKI — Crystal input / external clock |
| Chân 14 | OSC2/CLKO — Crystal output / clock out |
| Chân 15 | VSS — Ground reference |
| Chân 16 | RC0/T1OSO — I/O port C bit 0 / Timer1 oscillator out |
| Chân 17 | RC1/T1OSI — I/O port C bit 1 / Timer1 oscillator in |
| Chân 18 | VUSB — Internal 3.3 V USB regulator output (decouple with 220 nF) |
| Chân 19 | D- — USB data minus (90 ohm differential with D+) |
| Chân 20 | D+ — USB data plus (90 ohm differential with D-) |
| Chân 21 | RD0 — I/O port D bit 0 |
| Chân 22 | RD1 — I/O port D bit 1 |
| Chân 23 | RD2 — I/O port D bit 2 |
| Chân 24 | RD3 — I/O port D bit 3 |
| Chân 25 | RD4 — I/O port D bit 4 |
| Chân 26 | RD5 — I/O port D bit 5 |
| Chân 27 | RD6 — I/O port D bit 6 |
| Chân 28 | RD7 — I/O port D bit 7 |
| Chân 29 | VSS — Ground reference |
| Chân 30 | RC6/TX/CK — I/O port C bit 6 / EUSART TX / clock |
| Chân 31 | RC7/RX/DT — I/O port C bit 7 / EUSART RX / data |
| Chân 32 | RB0/AN12 — I/O port B bit 0 / analog input 12 |
| Chân 33 | RB1/AN10 — I/O port B bit 1 / analog input 10 |
| Chân 34 | RB2/AN8 — I/O port B bit 2 / analog input 8 |
| Chân 35 | RB3/AN9 — I/O port B bit 3 / analog input 9 |
| Chân 36 | RB4 — I/O port B bit 4 |
| Chân 37 | RB5 — I/O port B bit 5 |
| Chân 38 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| Chân 39 | RB7/PGD — I/O port B bit 7 / ICSP data |
| Chân 40 | VDD — Positive supply (2.0-5.5 V) |
| Chân 41 | RC4/SDA — I/O port C bit 4 / I2C data |
| Chân 42 | RC5/SCL — I/O port C bit 5 / I2C clock |
| Chân 43 | RC3 — I/O port C bit 3 |
| Chân 44 | MCLR/VPP — Master clear reset / programming voltage |
| Chân 45 | EP — Exposed thermal pad - tie to VSS (ground) |
Ứng dụng tiêu biểu
PIC18LF4450-I/ML phù hợp cho 6 Áp dụngs: USB HID Peripherals (Keyboard / Mouse / Custom Joystick), USB-to-UART / USB-to-SPI Bridge, Battery-Powered USB Sensor Node, Industrial Data Logger with USB Upload, LIN Slave / Body-Controller Node (Non-AEC-Q100), Educational / Hobbyist USB Development Board.
USB HID Peripherals (Keyboard / Mouse / Custom Joystick)
The PIC18LF4450's integrated USB 2.0 Full-Speed SIE and 16 KB Flash make it a strong fit for low-cost USB HID devices. The on-chip SIE handles NRZI encoding, bit stuffing and CRC so the CPU is free to scan a keyboard matrix, debounce buttons, or sample an analog joystick - tasks that fit comfortably in 16 KB of XC8-compiled firmware. Its 10-bit ADC reads the joystick potentiometers directly, while the 48 MHz / 12 MIPS core delivers ample headroom for HID class descriptors and custom report formats. The wide 2.0-5.5 V supply lets the device draw power directly from the USB VBUS rail through a 3.3 V LDO, eliminating the need for a separate power IC in this application.
Được đề xuất
USB-to-UART / USB-to-SPI Bridge
In USB-to-UART bridge designs the PIC18LF4450's EUSART, SPI (up to 10 Mbit/s) and USB SIE replace the classic FTDI bridge topology at a lower BOM cost. The 48 MHz core can sustain 921600 baud on the EUSART while servicing USB CDC interrupt transfers without data loss. The 2.0-5.5 V supply lets the bridge interface directly to 3.3 V MCUs without level shifters, and the 256-byte EEPROM stores USB VID/PID pairs and user configuration that can be re-flashed in-circuit. Use the internal 3.3 V USB regulator to power the bus-pulled D+/D- lines and free an external LDO slot.
Được đề xuất
Battery-Powered USB Sensor Node
The PIC18LF4450-I/ML's 2.0-5.5 V range and nanoWatt power management are tuned for Li-ion- or 2x AA-powered sensor nodes that recharge or sync over USB. Sleep current drops into the single-digit-microamp range with the USB SIE and ADC disabled, so a 2000 mAh Li-ion cell can run multi-year duty cycles. The 10-bit ADC reads thermistor, photodiode or gas-sensor outputs without a separate analog front-end, while the I2C bus chains a digital accelerometer or humidity sensor. When the USB cable is plugged in, the part auto-detects VBUS, enumerates, and streams cached data to the host - a complete edge-node on one die.
Được đề xuất
Industrial Data Logger with USB Upload
Industrial data loggers benefit from the PIC18LF4450's 256-byte EEPROM (for configuration and RTC trim), 768-byte SRAM ring buffer, and 16 KB Flash for a small FAT12/16 file-system image plus a UART/Modbus logger stack. The EUSART (LIN-capable) interfaces directly to RS-485 transceivers for field-bus polling, while the on-chip 10-bit ADC samples 4-20 mA loop signals through a burden resistor. USB Full-Speed is used only for data export, so the part spends 99% of its time at 31 kHz internal oscillator to minimize power. The 44-QFN exposed pad dissipates heat effectively in the -40 C to +85 C industrial range.
Được đề xuất
LIN Slave / Body-Controller Node (Non-AEC-Q100)
While the PIC18LF4450 is not AEC-Q100 qualified, its EUSART with LIN protocol support, 2.0-5.5 V supply range, and -40 C to +85 C industrial rating suit non-safety automotive accessories: HVAC control, ambient lighting, or seat-position memory. The 10-bit ADC reads thermistor inputs for cabin-temperature regulation; PWM drives small motors or LED strings; LIN transceivers connect directly to the EUSART with no external protocol controller. The 16 KB Flash accommodates a LIN state-machine plus diagnostic stack in XC8. For safety-critical or AEC-Q100 applications migrate to PIC18F46K40 or PIC18F26K83 family.
Được đề xuất
Educational / Hobbyist USB Development Board
The PIC18LF4450-I/ML is a staple of university curricula and open-source USB development kits (PINGUINO, PIC18F4550 Open Source USB Framework) because it integrates USB without external PHY crystals. The 44-QFN is breadboard-friendly with carrier PCBs that expose every I/O pin to 0.1-inch headers, while the 2.0-5.5 V supply lets students power the board from a bench supply, USB port, or 9 V battery with a linear regulator. 16 KB Flash is enough to demonstrate HID, CDC, MIDI, and custom-bulk class examples; the 48 MHz core enables real-time signal processing demos (FFT, DSP filter). MPLAB X IDE, XC8, and Microchip Code Configurator are all free and well-documented.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4450-I/ML — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC18F4550-I/ML | PIC18F4450-I/ML | PIC18F4455-I/ML | PIC18F46K40-I/ML |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (ML) 8x8 mm | 44-QFN (ML) 8x8 mm - same | 44-QFN (ML) 8x8 mm - same | 44-QFN (ML) 8x8 mm - same | 44-QFN (ML) 8x8 mm - same |
| Flash Memory | 16 KB | 32 KB | 32 KB | 24 KB | 64 KB |
| RAM | 768 B | 2 KB | 2 KB | 2 KB | 4 KB |
| Operating Voltage | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 1.8 V to 3.6 V |
| USB Support | FS USB 2.0 + internal 3.3V reg | FS USB 2.0 + internal 3.3V reg | FS USB 2.0 + internal 3.3V reg | FS USB 2.0 + internal 3.3V reg | No native USB (USB via external PHY) |
| Max Clock Speed | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 64 MHz (16 MIPS) |
| ADC Resolution | 10-bit (13 channels) | 10-bit (13 channels) | 10-bit (13 channels) | 10-bit (13 channels) | 10-bit (35 channels, with DAC/CTMU) |
| AEC-Q100 Qualified | No (industrial -40 to +85 C) | No | No | No | Yes (Q variants available) |
| Indicative Price (qty 1) | USD 6.40 | USD 7.20 | USD 6.95 | USD 6.50 | USD 3.90 |
Bảo phân biệt quan trọng
- Widest operating-voltage range in the PIC18F4450 USB family (vsPIC18F4550-I/ML)
- nanoWatt low-power modes for USB-attach battery devices (vsPIC18F46K40-I/ML)
- Lower entry price for cost-sensitive HID/CAN applications (vsPIC18F4455-I/ML)
Ghi chú thiết kế
USB D+ and D- traces must be routed as a 90-ohm differential pair, matched within 0.5 mm in length, with continuous ground reference plane beneath. Keep the 220 nF VUSB decoupling capacitor within 5 mm of the VUSB pin (pin 18) and the crystal within 5 mm of OSC1/OSC2 with short traces surrounded by a grounded guard ring. Reference: Microchip AN233 'USB PCB Layout Guidelines'.
Estimated: average active current at 48 MHz, 5.5 V is ~15 mA with USB idle, ~22 mA with USB active. In sleep mode (CPU off, peripherals off) Iq drops to ~0.1 uA. For self-powered designs disable the internal 3.3 V USB regulator by clearing the VREGEN CONFIG bit and supplying 3.3 V to the VUSB pin from an external rail. For bus-powered designs the internal regulator auto-powers from VBUS.
Do not omit the MCLR pull-up (10 k to VDD) - the device will randomly reset. Do not tie VUSB to VDD - the internal regulator requires a dedicated decoupling cap to GND. Ensure the exposed pad (EP, pin 45) is soldered to a continuous ground pour, both for thermal dissipation and for stable USB signaling. Do not exceed 10 MHz on SCK without checking the SPI electrical spec for capacitive load.
The 10-bit ADC is specified at 30 ksps; sampling a 4 kHz signal requires RC input impedance below 10 kohm for full accuracy. Add a 100 nF ceramic bypass directly on each AVDD-style analog pin if used, and route analog traces away from USB differential pair. For high-impedance sensor inputs use the on-chip CTMU or add an external op-amp buffer rather than relying on the ADC's internal holding capacitor.
Thông tin tuân thủ
ML package suffix denotes lead-free matte-tin finish. Not AEC-Q100 - for automotive applications use PIC18F46K40 Q variants or PIC18F26K83 in larger packages.