PIC18LF2455-I/SP - 8-bit MCU 48MHz 24KB Flash FS-USB SPDIP-28
MPN: PIC18LF2455-I/SP ✓ Hoạt độngPIC18LF2455-I/SP Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, Flash program memory, RAM, EEPROM, and peripherals on one die. The PIC18 family uses an enhanced RISC architecture with 16-bit instructions and 8-bit data paths, positioned between PIC16 mid-range parts and PIC32 32-bit parts in Microchip's portfolio. Microcontrollers sit below microprocessors in the compute hierarchy, providing deterministic, low-power embedded control for appliances, sensors, and USB peripherals.
Key specifications include 48 MHz maximum CPU clock (12 MIPS), 24 KB Flash (12K x 16 words), 2048 bytes SRAM, 256 bytes EEPROM, 16-bit digital I/O, 10-channel 10-bit ADC, two analog comparators, one Enhanced USART, one MSSP (I2C/SPI), a Full-Speed USB 2.0 SIE (12 Mbit/s), and 5 PWM/CCP/ECCP channels. NanoWatt power management offers idle, sleep, and ultra-low-power wake features. Internal oscillator accuracy is typically within +/-2% across voltage and temperature.
The architecture combines a Harvard bus with on-chip hardware multiply, allowing single-cycle math operations on 8-bit data. The integrated USB transceiver eliminates external PHY/clock components; firmware implements the USB stack via the Microchip USB framework, supporting HID, CDC, MSD, and custom classes. The device is industrial-grade (-40C to +85C, "I" suffix) and is a popular choice for legacy and hobby-grade USB peripherals.
Typical applications include low-cost USB HID peripherals (keyboards, mice, game controllers), USB-to-UART bridges, CDC virtual COM ports, sensor data loggers, educational development boards (such as PICDEM FSUSB), and industrial HMI panels. The wide 2.0-5.5 V supply range simplifies integration into both 3.3 V and 5 V systems without level shifters.
When designing with this part, ensure USB DP/DM trace impedance matches 90 ohm differential and that the VUSB pin is tied to the internal 3.3 V regulator output or a clean external 3.3 V rail. Firmware must drive the UCREGEN and UTRDIS bits correctly and provide adequate bulk capacitance on VUSB.
This page synthesizes verified distributor pricing, same-brand drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF2455-I/SP — 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 PIC18LF2455-I/SP (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, I/O Pins, Operating Temperature.
PIC18F2455-I/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2550-I/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2553-I/SP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F2450-I/SP
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2458-I/SP
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2455-I/SP Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 8-bit enhanced RISC |
| Program Memory (Flash) | 24 KB (12K x 16 words) |
| Data SRAM | 2048 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Clock | 48 MHz (12 MIPS) |
| Operating Voltage (Vdd) | 2.0 V to 5.5 V |
| Digital I/O Pins | 16 (multiplexed with peripherals) |
| ADC | 10 channels x 10-bit |
| Analog Comparators | 2 |
| PWM Channels (CCP/ECCP) | 5 |
| Timers | 4 (Timer0/1/2/3) |
| Communication Interfaces | USB FS 2.0, EUSART, MSSP (I2C/SPI) |
| USB Transceiver | Integrated Full-Speed 12 Mbit/s SIE |
| Hộp | SPDIP-28 (/SP) |
| Operating Temperature (I suffix) | -40C to +85C (industrial) |
| Kiểu lắp đặt | Through-Hole (DIP) |
| Trạng thái RoHS | Compliant (lead-free /SP marking) |
| Cấp MSL | 1 (not moisture-sensitive, through-hole) |
Cấu hình chân PIC18LF2455-I/SP
| Chân 1 | MCLR/RE3 — Master Clear (reset) input / digital input only on PORTE |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2/Vref- — PORTA bit 2 / analog input 2 / ADC negative reference |
| Chân 5 | RA3/AN3/Vref+ — PORTA bit 3 / analog input 3 / ADC positive reference |
| Chân 6 | RA4/T0CKI/RCV — PORTA bit 4 / Timer0 clock input / USB RCV |
| Chân 7 | RA5/AN4/SS/HLVDIN/RC2OUT — PORTA bit 5 / analog 4 / SPI SS / HLVD input / USB RC2OUT |
| Chân 8 | Vss — Ground reference |
| Chân 9 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock / PORTA bit 7 |
| Chân 10 | OSC2/CLKO/RA6 — Crystal oscillator output / clock out / PORTA bit 6 |
| Chân 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock input |
| Chân 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 PWM output |
| Chân 13 | RC2/CCP1/P1A — PORTC bit 2 / CCP1 PWM output / PWM P1A |
| Chân 14 | Vusb — USB internal 3.3V regulator output |
| Chân 15 | RC4/D-/VM — PORTC bit 4 / USB D- / external USB monitor input |
| Chân 16 | RC5/D+/VP — PORTC bit 5 / USB D+ / external USB monitor input |
| Chân 17 | Vss — Ground reference |
| Chân 18 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART clock |
| Chân 19 | RC7/RX/DT/SDO — PORTC bit 7 / EUSART RX / EUSART data / SPI SDO |
| Chân 20 | Vdd — Positive supply (2.0-5.5V) |
| Chân 21 | RB0/AN12/INT0/FLT0 — PORTB bit 0 / analog 12 / external interrupt 0 / PWM fault |
| Chân 22 | RB1/AN10/INT1 — PORTB bit 1 / analog 10 / external interrupt 1 |
| Chân 23 | RB2/AN8/INT2/VMO — PORTB bit 2 / analog 8 / external interrupt 2 / USB VMO |
| Chân 24 | RB3/AN9/CCP2/VPO — PORTB bit 3 / analog 9 / CCP2 / USB VPO |
| Chân 25 | RB4/AN11/KBI0 — PORTB bit 4 / analog 11 / interrupt-on-change KBI0 |
| Chân 26 | RB5/KBI1/PGM — PORTB bit 5 / KBI1 / LVP programming data |
| Chân 27 | RB6/KBI2/PGC — PORTB bit 6 / KBI2 / ICSP clock |
| Chân 28 | RB7/KBI3/PGD — PORTB bit 7 / KBI3 / ICSP data |
Ứng dụng tiêu biểu
PIC18LF2455-I/SP phù hợp cho 6 Áp dụngs: USB HID Peripheral (Keyboard / Mouse / Game Controller), USB-to-UART Bridge / CDC Virtual COM Port, Industrial Sensor Data Logger with USB Output, Educational Microcontroller Development Board, HMI Front Panel with USB Diagnostics Port, Custom USB Mass Storage / Custom Class Device.
USB HID Peripheral (Keyboard / Mouse / Game Controller)
The PIC18LF2455-I/SP's integrated Full-Speed USB 2.0 SIE eliminates the need for an external PHY chip, making it ideal for low-cost USB HID devices. Its 48 MHz CPU clock and 24 KB Flash comfortably fit HID report descriptors, debounce logic, and macro layers for keyboards or gaming controllers. The 2.0-5.5 V supply range supports both bus-powered 5 V and battery-powered 3.3 V designs, while the 16 I/O pins are sufficient for matrix-scanned key arrays.
Được đề xuất
USB-to-UART Bridge / CDC Virtual COM Port
The PIC18LF2455-I/SP's integrated USB transceiver plus EUSART make it well-suited for USB-to-UART bridges used as virtual COM ports in industrial and embedded applications. Its 48 MHz bus delivers reliable CDC throughput at full USB FS 12 Mbit/s, while the LF voltage variant operates from a single 3.3 V rail without an LDO. Firmware using Microchip's CDC stack achieves transparent UART tunneling with baud rates up to 921600 bps.
Được đề xuất
Industrial Sensor Data Logger with USB Output
The PIC18LF2455-I/SP's 10-channel 10-bit ADC and 24 KB Flash support multi-sensor data logging with USB dump capability for factory diagnostics. Its 2 KB RAM enables buffering of acquisition samples before USB transfer, while industrial -40C to +85C temperature operation suits factory-floor enclosures. NanoWatt sleep modes extend battery life between log sessions in portable units.
Được đề xuất
Educational Microcontroller Development Board
The PIC18LF2455-I/SP's through-hole SPDIP-28 package and integrated USB make it a teaching-friendly part for courses on embedded C, USB protocols, and PIC assembly. Hobbyists and universities benefit from breadboard-friendly pinout and Microchip's free MPLAB X IDE. Its low cost and wide hobby community reduce the learning curve for first-time MCU users exploring USB peripheral development.
Được đề xuất
HMI Front Panel with USB Diagnostics Port
The PIC18LF2455-I/SP's 5 PWM channels drive LED dimmers or backlights, while the integrated USB allows field technicians to attach a laptop for diagnostics on industrial front panels. Its analog comparators monitor voltage rails, and the 16 I/O can scan button matrices or rotary encoders. The LF voltage variant permits battery backup for parameter retention in field-deployable HMI units.
Được đề xuất
Custom USB Mass Storage / Custom Class Device
The PIC18LF2455-I/SP can implement USB Mass Storage (MSD), CDC+MSD composite, or fully custom USB classes for proprietary host software. Microchip's free USB stack supports bulk transfers up to the FS USB 2.0 ceiling. The 2 KB SRAM provides the endpoint buffer space needed for sector-level transfers, while 24 KB Flash holds both the bootloader and the application code comfortably.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF2455-I/SP — 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 | PIC18F2455-I/SP | PIC18F2550-I/SP | PIC18F2553-I/SP | PIC18F2450-I/SP | PIC18LF2458-I/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SPDIP-28 (/SP) | SPDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same |
| Flash Memory | 24 KB | 24 KB | 32 KB (+33%) | 32 KB (+33%) | 16 KB (-33%) | 24 KB |
| SRAM | 2048 B | 2048 B | 2048 B | 2048 B | 2048 B | 2048 B |
| Operating Voltage | 2.0-5.5 V | 4.2-5.5 V (no LF) | 4.2-5.5 V | 4.2-5.5 V | 2.0-5.5 V | 2.0-5.5 V |
| USB 2.0 FS Transceiver | Yes (integrated) | Yes | Yes | Yes | No | Yes |
| ADC Channels | 10 x 10-bit | 10 x 10-bit | 10 x 10-bit | 8 x 10-bit | 10 x 10-bit | 10 x 10-bit |
| Maximum CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
Bảo phân biệt quan trọng
- Integrated Full-Speed USB 2.0 transceiver with on-chip DP/DM (vsPIC18F2450-I/SP)
- Wide 2.0-5.5 V operating voltage (LF variant) (vsPIC18F2455-I/SP)
- 24 KB Flash with 256-byte EEPROM in the same die (vsPIC18F2550-I/SP)
Ghi chú thiết kế
The PIC18LF2455-I/SP accepts 2.0-5.5 V on Vdd (pin 20), but the USB transceiver requires a clean 3.3 V rail from the internal Vusb regulator (pin 14). According to the Microchip DS39632 datasheet, you must place a 220 nF decoupling capacitor on Vusb and a 0.1 uF plus 10 uF bulk capacitor on Vdd. Powering the device from a noisy switching rail without input filtering may corrupt USB packets; a ferrite bead or LDO upstream of Vdd is recommended for bus-powered designs.
Route USB D+/D- (RC4/RC5, pins 15/16) as a 90 ohm differential pair with controlled impedance; keep traces under 50 mm and match lengths to within 2 mm. Place the 27 ohm series resistors on D+ and D- within 4 mm of the MCU pins. According to USB 2.0 FS signal-integrity guidelines, an unshielded cable plus mismatched impedance causes enumeration failures and intermittent disconnects. Avoid routing USB traces near oscillator or PWM-switching signals.
Do not leave MCLR (pin 1) floating. According to the Microchip DS39632 datasheet, MCLR must be tied to Vdd through a 10 kohm resistor for normal operation, or driven low for external reset. A floating MCLR may cause random resets or programming failures. Also configure the CONFIG3H register to disable the internal MCLR if you are using pin 1 as a digital input on PORTE3.
For reliable USB Full-Speed operation, ensure the internal 48 MHz PLL is stable before asserting the USB module enable bit (UCON.USBEN). According to DS39632, the firmware must poll the PLL lock status bit (OSCCON.PLLRDY) and wait at least 2 ms after start-up for the PLL to settle. Connecting a USB host while the PLL is unstable causes enumeration errors visible in host logs as 'Device Descriptor Request Failed'.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip material declarations; lead-free /SP marking confirmed in DS39632 ordering information. Not AEC-Q100 qualified; for automotive applications select a Q-grade variant.
