PIC18LF4455-I/P - 8-Bit 48MHz USB MCU 24KB Flash 40-PDIP | Microchip
MPN: PIC18LF4455-I/P ✓ Hoạt độngPIC18LF4455-I/P Tóm tắt
An 8-bit microcontroller (MCU) is a programmable processor that executes instructions on 8-bit-wide data, typically chosen for cost-sensitive, low-power, and deterministic control tasks. The PIC18F family sits in Microchip's mid-range 8-bit portfolio, between the baseline PIC10/12/16 series and the 16-bit dsPIC/PIC24 line, and the PIC18LF4455 specifically targets USB-enabled embedded designs thanks to its on-chip Full-Speed USB 2.0 (12 Mbit/s) peripheral plus three serial ports (I2C, SPI up to 10 Mbit/s, and LIN-capable EUSART).
Key features of the PIC18LF4455-I/P include nanoWatt power management with multiple idle/sleep modes, a 10-channel 10-bit ADC, two analog comparators, two 8-bit timers plus three 16-bit timers, a 9-channel Enhanced Capture/Compare/PWM module, and a universal serial bus with on-chip transceiver. The wide 2.0 V to 5.5 V supply range allows direct operation from a single Li-ion cell, two alkaline cells, or a regulated 5 V rail. The industrial -40C to +85C temperature grade suits outdoor, industrial, and automotive-cockpit applications that do not require full AEC-Q100 qualification.
Architecture-wise, the device uses an enhanced Harvard architecture with a 16-bit instruction word, 8-bit data path, hardware multiply, and a 31-level hardware stack, yielding roughly 10 MIPS sustained throughput at 48 MHz. The integrated SIE (Serial Interface Engine) handles USB framing and endpoint management in hardware, leaving the CPU free for application logic - this is a significant system-bill-of-materials reduction versus external USB interface chips.
Typical applications for this part include USB HID peripherals such as custom keyboards, mice, and game controllers, USB-to-UART bridges, low-speed data loggers with PC connectivity, embedded development platforms (it appears in many PICDEM FS USB boards), industrial sensor nodes communicating over USB, and learning/hobby projects that benefit from a through-hole 40-pin package for breadboarding. The PDIP form factor is especially useful for prototypes and educational designs where socketed parts are reused.
When designing with this part, the engineer should note the difference between the LF (low-voltage, 2.0-5.5 V) and the F (4.2-5.5 V only) variants, and ensure the 48 MHz internal or crystal configuration matches the USB Full-Speed PLL requirement. For long-term production, consider the surface-mount PIC18LF4455-I/PT (TQFP-44) variant once the design stabilizes, since the PDIP package is generally priced higher and aimed at low-volume or development use.
This page consolidates distributor pricing, verified drop-in alternatives in the same 40-PDIP package, and practical design notes that go beyond the manufacturer datasheet to help engineers sourcing and qualifying the part.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4455-I/P — 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 PIC18LF4455-I/P (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Core, Operating Temperature.
PIC18F4455-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4550-I/P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4550-I/PT
✅ Drop-In✓ Còn hàng
$4.95 / Đơn vị
Xem tài liệu →PIC18LF4553-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4458-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4455-I/P Tỷ lệ tối đa & tính chất điện
| Product Family | PIC18F |
| Core Architecture | 8-bit enhanced Harvard |
| Max CPU Frequency | 48 MHz |
| Program Memory (Flash) | 24 KB (12K x 16) |
| Data RAM | 2 KB |
| Supply Voltage Range | 2.0 V to 5.5 V (LF variant) |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 40-pin PDIP (I/P) |
| USB Peripheral | USB 2.0 Full-Speed (12 Mbit/s), on-chip transceiver |
| ADC | 10-bit, up to 13 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Capture/Compare/PWM | Enhanced CCP, up to 9 channels |
| Serial Interfaces | USB, I2C, SPI (up to 10 Mbit/s), EUSART (LIN-capable) |
| Analog Comparators | 2 |
| Instruction Set | PIC18 (16-bit instruction word, hardware multiply) |
| MIPS | 10 MIPS @ 48 MHz |
| Power-Saving Modes | nanoWatt (multiple idle and sleep modes) |
| Kiểu lắp đặt | Through-Hole |
Cấu hình chân PIC18LF4455-I/P
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / digital input |
| 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-/CVREF — PORTA bit 2 / analog input 2 / voltage reference |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / voltage reference plus |
| Chân 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock input / comparator 1 output |
| Chân 7 | RA5/AN4/C2OUT — PORTA bit 5 / analog input 4 / comparator 2 output |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/CLKI — Crystal oscillator input / external clock input |
| Chân 10 | OSC2/CLKO — Crystal oscillator output / clock output |
| Chân 11 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator output |
| Chân 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Chân 14 | VUSB — Internal USB 3.3 V regulator output (bypass required) |
| Chân 15 | RC4/D-/VMIO — PORTC bit 4 / USB D- / USB voltage monitoring |
| Chân 16 | RC5/D+/VPIO — PORTC bit 5 / USB D+ / USB voltage monitoring |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / EUSART TX / clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / EUSART RX / data |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage |
| Chân 21 | RB0/AN12/INT0 — PORTB bit 0 / analog input 12 / external interrupt 0 |
| Chân 22 | RB1/AN10/INT1 — PORTB bit 1 / analog input 10 / external interrupt 1 |
| Chân 23 | RB2/AN8/INT2 — PORTB bit 2 / analog input 8 / external interrupt 2 |
| Chân 24 | RB3/AN9/CCP2 — PORTB bit 3 / analog input 9 / CCP2 |
| Chân 25 | RB4/AN11 — PORTB bit 4 / analog input 11 |
| Chân 26 | RB5/KBI1/PGM — PORTB bit 5 / keyboard interrupt / LVP programming |
| Chân 27 | RB6/KBI2/PGC — PORTB bit 6 / keyboard interrupt / ICSP clock |
| Chân 28 | RB7/KBI3/PGD — PORTB bit 7 / keyboard interrupt / ICSP data |
| Chân 29 | VDD — Positive supply voltage |
| Chân 30 | VSS — Ground reference |
| Chân 31 | RD0/SPP0 — PORTD bit 0 / Streaming Parallel Port data 0 |
| Chân 32 | RD1/SPP1 — PORTD bit 1 / Streaming Parallel Port data 1 |
| Chân 33 | RD2/SPP2 — PORTD bit 2 / Streaming Parallel Port data 2 |
| Chân 34 | RD3/SPP3 — PORTD bit 3 / Streaming Parallel Port data 3 |
| Chân 35 | RD4/SPP4 — PORTD bit 4 / Streaming Parallel Port data 4 |
| Chân 36 | RD5/SPP5/P1B — PORTD bit 5 / SPP data 5 / PWM1B |
| Chân 37 | RD6/SPP6/P1C — PORTD bit 6 / SPP data 6 / PWM1C |
| Chân 38 | RD7/SPP7/P1D — PORTD bit 7 / SPP data 7 / PWM1D |
| Chân 39 | RE0/RD/AN5 — PORTE bit 0 / parallel-port read / analog input 5 |
| Chân 40 | RE1/WR/AN6 — PORTE bit 1 / parallel-port write / analog input 6 |
Ứng dụng tiêu biểu
PIC18LF4455-I/P phù hợp cho 6 Áp dụngs: USB HID Input Devices (Keyboard, Mouse, Game Controller), USB-to-UART / Serial Bridge, Industrial Sensor Data Logger with PC Connectivity, Embedded Learning and Hobby Projects, USB-Enabled Lighting and Fan Controllers, Low-Voltage Medical and Wellness USB Peripherals.
USB HID Input Devices (Keyboard, Mouse, Game Controller)
The PIC18LF4455-I/P is purpose-built for USB HID peripherals that connect directly to a PC host. Its integrated Full-Speed USB 2.0 peripheral with on-chip transceiver eliminates external interface ICs, while 24 KB of Flash comfortably fits HID descriptors, debounce state machines, and LED control logic. Operating from 2.0 V to 5.5 V, it can be powered from a regulated 3.3 V rail or directly from a USB port when VBUS is regulated to 5 V. At 48 MHz the core delivers 10 MIPS, sufficient for polling rates above 125 Hz with room for composite HID stacks. The 40-pin PDIP package simplifies breadboard prototypes for hobbyists building custom keyboards or macro pads.
Được đề xuất
USB-to-UART / Serial Bridge
The PIC18LF4455-I/P implements a USB CDC class device that appears as a virtual COM port on the host, paired with its on-chip EUSART that exposes UART to the application side. This combination replaces discrete USB-to-UART bridge ICs such as the FT232R, reducing BOM and freeing board area. The MCU's 2.0 V to 5.5 V supply lets the bridge interface directly with 3.3 V target logic without a level shifter. With 48 MHz operation and hardware flow-control support, sustained serial throughput above 1 Mbaud is achievable for debug consoles, firmware-update channels, and field-service interfaces on industrial equipment.
Được đề xuất
Industrial Sensor Data Logger with PC Connectivity
Industrial sensors that need occasional PC access benefit from the PIC18LF4455-I/P's combination of 10-bit ADC, multiple timers, and integrated USB. The MCU samples analog or digital sensors, time-stamps readings using its 16-bit timers, stores logs in external EEPROM or RAM, and offloads data to a host PC over USB on demand. The 2.0 V to 5.5 V supply range allows battery-powered remote deployment, while the -40 C to +85 C industrial temperature grade covers factory-floor environments. The 40-pin PDIP package simplifies field-replacement maintenance since the part can be socketed for quick swap without reworking surface-mount pads.
Được đề xuất
Embedded Learning and Hobby Projects
The PIC18LF4455-I/P is a frequent choice for university embedded systems courses and maker tutorials because the 40-pin PDIP package drops into standard breadboards and IC sockets, allowing students to reuse expensive MCU samples across multiple lab sessions. The on-chip USB peripheral introduces learners to real-world device-class protocols without the complexity of external PHY chips. With Microchip's free MPLAB X IDE, XC8 compiler, and extensive PICDEM FS USB demo code, beginners can build a working HID or CDC device in a single lab period. The LF supply range also allows experimenting with battery and energy-harvesting power sources.
Được đề xuất
USB-Enabled Lighting and Fan Controllers
Custom PC-controlled lighting strips, fan controllers, and case mod accessories often use the PIC18LF4455-I/P as a USB host interface plus PWM generator. The MCU's Enhanced CCP module delivers up to nine PWM channels capable of driving MOSFET gates for RGB LED dimming or fan speed control at audio-noise-free frequencies above 20 kHz. USB connectivity allows a host application to adjust color, brightness, and fan curves in real time. The wide supply range lets the device share the 12 V rail of a PC environment after regulation, while the industrial temperature grade handles the thermal envelope inside a chassis.
Được đề xuất
Low-Voltage Medical and Wellness USB Peripherals
The PIC18LF4455-I/P supports battery-powered medical and wellness peripherals such as USB-connected thermometers, pulse oximeter front-ends, and personal-health data loggers that transmit readings to a PC host. Its 2.0 V to 5.5 V supply range matches a single Li-ion or two alkaline cells commonly used in handheld medical devices, while the integrated USB peripheral charges the battery and streams data when the device is docked. The MCU's low-power nanoWatt modes allow deep sleep between measurements, extending battery life for ambulatory use. Note that medical applications may require additional IEC 60601 qualification at the system level.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4455-I/P — 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 | PIC18F4455-I/P | PIC18LF4550-I/P | PIC18F4550-I/P | PIC18LF4553-I/P | PIC18F4458-I/P |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP (I/P) | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Supply Voltage Range | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) |
| Flash Program Memory | 24 KB | 24 KB | 32 KB | 32 KB | 32 KB | 24 KB |
| Data RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| USB Peripheral | FS USB 2.0, 12 Mbit/s, on-chip transceiver | FS USB 2.0, 12 Mbit/s, on-chip transceiver | FS USB 2.0, 12 Mbit/s, on-chip transceiver | FS USB 2.0, 12 Mbit/s, on-chip transceiver | FS USB 2.0, 12 Mbit/s, on-chip transceiver | FS USB 2.0, 12 Mbit/s, on-chip transceiver |
| Max CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Param Match Percentage | 100% | 90% (F vs LF supply range) | 90% (32 KB vs 24 KB Flash) | 80% (F + 32 KB Flash) | 80% (different peripheral mapping) | 90% (F variant, similar Flash) |
Bảo phân biệt quan trọng
- Wider low-voltage operating range (2.0 V to 5.5 V) than the PIC18F4455-I/P (vsPIC18F4455-I/P)
- Integrated Full-Speed USB 2.0 with on-chip transceiver (vsPIC18LF4550-I/P)
- 24 KB Flash is sufficient for typical USB HID/CDC stacks (vsPIC18LF4550-I/P)
Ghi chú thiết kế
The PIC18LF4455-I/P requires a stable decoupling network on every VDD pin (pins 11, 20, 32) with 100 nF ceramic capacitors placed as close to the package as possible. A bulk 10 uF tantalum or ceramic capacitor on the main VDD rail helps the internal 3.3 V USB regulator (VUSB) handle the inrush of USB attach events. The internal VUSB regulator must be bypassed with 220 nF plus 4.7 uF per the datasheet; omitting these prevents USB enumeration on some hosts. Estimated: for a USB high-power device drawing 500 mA, the bulk capacitor should be at least 22 uF to keep rail droop under 0.3 V.
Do not confuse the PIC18LF4455 with the PIC18F4455 - the LF prefix is mandatory for designs that operate below 4.2 V. Mixing the two on a 3.3 V rail causes USB enumeration failures and erratic ADC readings. Also note that the LF variant's maximum frequency derates at lower voltages; consult the electrical characteristics table for the exact Fmax-vs-VDD curve. Configuration bits must be programmed for the correct oscillator mode (HS-PLL for 48 MHz with a 4 MHz fundamental crystal) before USB will enumerate reliably.
Route the USB D+ and D- traces as a 90-ohm differential pair with matched length, keeping them short and away from switching power or clock traces. Place the 27-ohm series damping resistors on D+/D- near the MCU as shown in the datasheet reference design. The VUSB pin decoupling must be physically close to the package to minimize parasitic inductance that destabilizes the internal regulator. Shield the crystal traces and load capacitors with a ground pour to prevent noise injection into the USB PLL.
At 48 MHz CPU and full USB activity, the PIC18LF4455-I/P draws roughly 30 mA active, dissipating about 150 mW at 5 V. The 40-pin PDIP package has generous thermal mass and theta_JA above 60 C/W, so no heatsink is required. However, in enclosed housings above 60 C ambient the MCU can approach its 85 C industrial ceiling; verify with a thermal probe during validation. Sleep modes (nanoWatt) drop consumption below 1 uA for battery-powered applications.
Thông tin tuân thủ
RoHS and REACH status not specified in the verified web data. Lead-free per Microchip's standard process. The I/P industrial temperature grade (-40 C to +85 C) is not AEC-Q100 qualified; for automotive designs consult Microchip's automotive-grade PIC18F family.
