PIC18LF2455-I/SP - 8-bit MCU 48MHz 24KB Flash FS-USB SPDIP-28
MPN: PIC18LF2455-I/SP ✓ نشطPIC18LF2455-I/SP نظرة عامة
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.
بدائل مباشرة لـ PIC18LF2455-I/SP — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18LF2455-I/SP (نفس عامل الشكل والبصمة) — يختلف في Package, Timers, ADC, I/O Pins, Operating Temperature.
PIC18F2455-I/SP
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F2550-I/SP
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F2553-I/SP
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18F2450-I/SP
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF2458-I/SP
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF2455-I/SP الحدود القصوى والخصائص الكهربائية
| 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 |
| العلبة | SPDIP-28 (/SP) |
| Operating Temperature (I suffix) | -40C to +85C (industrial) |
| نوع التركيب | Through-Hole (DIP) |
| حالة RoHS | Compliant (lead-free /SP marking) |
| مستوى MSL | 1 (not moisture-sensitive, through-hole) |
تكوين أطراف PIC18LF2455-I/SP
| دبوس 1 | MCLR/RE3 — Master Clear (reset) input / digital input only on PORTE |
| دبوس 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| دبوس 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| دبوس 4 | RA2/AN2/Vref- — PORTA bit 2 / analog input 2 / ADC negative reference |
| دبوس 5 | RA3/AN3/Vref+ — PORTA bit 3 / analog input 3 / ADC positive reference |
| دبوس 6 | RA4/T0CKI/RCV — PORTA bit 4 / Timer0 clock input / USB RCV |
| دبوس 7 | RA5/AN4/SS/HLVDIN/RC2OUT — PORTA bit 5 / analog 4 / SPI SS / HLVD input / USB RC2OUT |
| دبوس 8 | Vss — Ground reference |
| دبوس 9 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock / PORTA bit 7 |
| دبوس 10 | OSC2/CLKO/RA6 — Crystal oscillator output / clock out / PORTA bit 6 |
| دبوس 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock input |
| دبوس 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 PWM output |
| دبوس 13 | RC2/CCP1/P1A — PORTC bit 2 / CCP1 PWM output / PWM P1A |
| دبوس 14 | Vusb — USB internal 3.3V regulator output |
| دبوس 15 | RC4/D-/VM — PORTC bit 4 / USB D- / external USB monitor input |
| دبوس 16 | RC5/D+/VP — PORTC bit 5 / USB D+ / external USB monitor input |
| دبوس 17 | Vss — Ground reference |
| دبوس 18 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART clock |
| دبوس 19 | RC7/RX/DT/SDO — PORTC bit 7 / EUSART RX / EUSART data / SPI SDO |
| دبوس 20 | Vdd — Positive supply (2.0-5.5V) |
| دبوس 21 | RB0/AN12/INT0/FLT0 — PORTB bit 0 / analog 12 / external interrupt 0 / PWM fault |
| دبوس 22 | RB1/AN10/INT1 — PORTB bit 1 / analog 10 / external interrupt 1 |
| دبوس 23 | RB2/AN8/INT2/VMO — PORTB bit 2 / analog 8 / external interrupt 2 / USB VMO |
| دبوس 24 | RB3/AN9/CCP2/VPO — PORTB bit 3 / analog 9 / CCP2 / USB VPO |
| دبوس 25 | RB4/AN11/KBI0 — PORTB bit 4 / analog 11 / interrupt-on-change KBI0 |
| دبوس 26 | RB5/KBI1/PGM — PORTB bit 5 / KBI1 / LVP programming data |
| دبوس 27 | RB6/KBI2/PGC — PORTB bit 6 / KBI2 / ICSP clock |
| دبوس 28 | RB7/KBI3/PGD — PORTB bit 7 / KBI3 / ICSP data |
التطبيقات النموذجية
PIC18LF2455-I/SP مناسب لـ 6 التطبيقs: 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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LF2455-I/SP — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | 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 |
أبرز الفروقات
- Integrated Full-Speed USB 2.0 transceiver with on-chip DP/DM (مقابلPIC18F2450-I/SP)
- Wide 2.0-5.5 V operating voltage (LF variant) (مقابلPIC18F2455-I/SP)
- 24 KB Flash with 256-byte EEPROM in the same die (مقابلPIC18F2550-I/SP)
ملاحظات التصميم
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'.
معلومات الامتثال
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.
