PIC18LF4455-I/ML - 8-bit 48MHz USB MCU 24KB Flash | Microchip
Référence : PIC18LF4455-I/ML ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.65 | $4,65 |
| 10 | $4.18 | $41,80 |
| 100 | $3.71 | $371,00 |
| 500 | $3.35 | $1 675,00 |
| 1 000 | $3 | $3 000,00 |
PIC18LF4455-I/ML Présentation
An 8-bit microcontroller (MCU) is a programmable processor with an 8-bit data path and integrated peripherals, used as the decision-making brain in embedded systems. Within the broader hierarchy, this device sits in the microcontroller category of integrated circuits, evolving upward into the semiconductor and embedded computing domains. PIC18 MCUs use a RISC instruction set with hardware multiplier, distinguishing them from 8051 and AVR cores while sharing the same design philosophy of deterministic real-time control.
Key features include 256 bytes of EEPROM, an integrated Full-Speed (12 Mbit/s) USB 2.0 SIE with on-chip transceiver, A/D converter, Capture/Compare/PWM modules, and nanoWatt Technology modes (Idle, Sleep, and Deep Sleep) for battery-powered designs. The 44-QFN package provides a compact footprint with an exposed thermal pad, enabling surface-mount assembly into USB peripheral designs that need a small board area.
The architecture combines a 16-bit-wide instruction word with separate program and data buses (Harvard architecture), allowing simultaneous fetch and read cycles that double throughput compared with traditional von-Neumann 8-bit cores. The integrated USB SIE eliminates the need for an external transceiver, reducing both BOM cost and PCB area in HID, CDC, and custom-class USB devices. The LF voltage range (2.0V to 5.5V) makes the chip suitable for direct Li-ion / 3.3V regulation while preserving the USB transceiver's proper signalling levels.
Typical applications include USB Human Interface Devices (HID keyboards, mice, game controllers), USB-to-UART bridges (CDC class), industrial data loggers with USB connectivity, low-power sensor hubs, and consumer USB peripherals such as MIDI adapters. The 2 KB RAM supports moderate USB class driver stacks, and 34 I/O pins allow direct connection to buttons, encoders, LEDs, and SPI or I2C peripherals without an external I/O expander.
When designing with this part, ensure the VUSB 3.3V internal LDO has a sufficient decoupling capacitor on the dedicated pin, and route the D+/D- differential pair with 90-ohm controlled impedance. For low-power designs, leverage the nanoWatt Sleep states and wake-up sources to maximize battery life in USB-attached devices that draw suspend current.
This page synthesizes distributor pricing, parametric alternatives, and USB design notes that complement the Microchip PIC18F4550 datasheet family reference manual.
Alternatives de remplacement direct pour PIC18LF4455-I/ML — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC18LF4455-I/ML (même facteur de forme et même empreinte) — différant par Package, Core Architecture, Operating Temperature, Program Memory (Flash), ADC.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC18F4550-I/ML
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC18F4455-I/ML
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC18LF4550-I/ML
✅ Remplacement direct✓ En stock
$5.4 / unité
Voir la fiche technique →PIC18LF2455-I/ML
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC18LF4455-I/ML Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory (Flash) | 24 KB (12K x 16 words) |
| RAM | 2 KB (2048 bytes) |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (LF) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| USB | USB 2.0 Full-Speed (12 Mbps) SIE + on-chip transceiver |
| A/D Converter | 10-bit, 13 channels |
| Timers | 4 (Timer0/1/2/3) |
| Capture/Compare/PWM | 1 CCP + 1 ECCP module |
| Serial Interfaces | EUSART (LIN-capable), I2C, SPI (up to 10 Mbps) |
| Boîtier | 44-pin QFN (8x8 mm) |
| Température de fonctionnement | -40C to +85C (Industrial) |
| Power-Saving Modes | nanoWatt (Idle, Sleep, Deep Sleep, Two-Speed Start-up) |
| Programming/Debug | ICSP via 5-pin header |
| Statut RoHS | Compliant |
Configuration des broches de PIC18LF4455-I/ML
| Broche 1 | RB2 — PORTB bit 2 (digital I/O) |
| Broche 2 | RB3 — PORTB bit 3 (digital I/O, PGA gain input) |
| Broche 3 | RB4 — PORTB bit 4 (digital I/O, IOC) |
| Broche 4 | RB5 — PORTB bit 5 (digital I/O, IOC) |
| Broche 5 | RB6 — PORTB bit 6 (ICSP clock, digital I/O) |
| Broche 6 | RB7 — PORTB bit 7 (ICSP data, digital I/O) |
| Broche 7 | VUSB — Internal USB 3.3V regulator output (decoupling) |
| Broche 8 | VDD — Positive supply voltage |
| Broche 9 | VSS — Ground reference |
| Broche 10 | D+ — USB data plus line |
| Broche 11 | D- — USB data minus line |
| Broche 12 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Broche 13 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Broche 14 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / VREF- |
| Broche 15 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / VREF+ |
| Broche 16 | RA4/TOCKI — PORTA bit 4 / Timer0 clock input |
| Broche 17 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| Broche 18 | RE3 — PORTE bit 3 (digital I/O) |
| Broche 19 | VSS — Ground reference |
| Broche 20 | VDD — Positive supply voltage |
| Broche 21 | OSC1/RA7 — Crystal input or digital I/O RA7 |
| Broche 22 | OSC2/RA6 — Crystal output or digital I/O RA6 |
| Broche 23 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 I/O |
| Broche 24 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Broche 25 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Broche 26 | RC4/D-/VMO — PORTC bit 4 / USB D- alternate |
| Broche 27 | RC5/D+/VPO — PORTC bit 5 / USB D+ alternate |
| Broche 28 | RC6/TX/CK — PORTC bit 6 / EUSART TX |
| Broche 29 | RC7/RX/DT — PORTC bit 7 / EUSART RX |
| Broche 30 | RD0 — PORTD bit 0 |
| Broche 31 | RD1 — PORTD bit 1 |
| Broche 32 | RD2 — PORTD bit 2 |
| Broche 33 | RD3 — PORTD bit 3 |
| Broche 34 | RD4 — PORTD bit 4 |
| Broche 35 | RD5 — PORTD bit 5 |
| Broche 36 | RD6 — PORTD bit 6 |
| Broche 37 | RD7 — PORTD bit 7 |
| Broche 38 | RE0 — PORTE bit 0 |
| Broche 39 | RE1 — PORTE bit 1 |
| Broche 40 | RE2 — PORTE bit 2 |
| Broche 41 | VSS — Ground reference (QFN pad) |
| Broche 42 | RB0 — PORTB bit 0 (interrupt-on-change) |
| Broche 43 | RB1 — PORTB bit 1 (interrupt-on-change) |
| Broche 44 | NC — Not connected (per datasheet) |
Applications typiques
PIC18LF4455-I/ML convient pour 6 applications: USB HID Peripheral (Keyboards, Mice, Gamepads), USB CDC Bridge (USB-to-UART, USB-to-SPI), Industrial Data Logger with USB Dump, Battery-Powered Sensor Hub, USB MIDI / Custom-Class Audio Adapter, USB Firmware Flasher / Bootloader Tool.
USB HID Peripheral (Keyboards, Mice, Gamepads)
The PIC18LF4455-I/ML is well suited for USB HID devices because its integrated Full-Speed USB 2.0 SIE and on-chip transceiver implement HID class directly without an external PHY, freeing board space while its 2 KB RAM holds the HID report buffer and HID descriptors. The 48 MHz CPU at 12 MIPS scans buttons, encoders, and matrix keypads inside one HID poll frame, and the 2.0V-5.5V LF range lets designers use Li-ion or regulated USB-bus 5V power without an additional LDO. Place the VUSB decoupling capacitor near the dedicated pin and route D+/D- with 90-ohm differential impedance, while the 34 I/O pins support direct LED drive and SPI peripherals.
Recommandé
USB CDC Bridge (USB-to-UART, USB-to-SPI)
In USB CDC bridge applications, the PIC18LF4455-I/ML EUSART (LIN-capable) plus the integrated USB SIE implement a USB-to-serial bridge at 12 Mbit/s full-speed rates, allowing legacy UART equipment to gain USB host connectivity. The 24 KB Flash holds the CDC ACM class driver and small command interpreter, while 256 bytes of EEPROM stores user configuration such as baud-rate defaults. The LF 2.0V-5.5V supply range supports portable USB bridges powered from Li-ion battery packs, and the 44-QFN package gives compact hardware that drops into the bridge cables used in industrial serial-to-USB converters.
Recommandé
Industrial Data Logger with USB Dump
For industrial data logging, the PIC18LF4455-I/ML captures analog signals with its 10-bit A/D converter (13 channels), stores time-stamped records in the 2 KB RAM plus optional external EEPROM via I2C, and dumps logs over USB when plugged into a host. The 16-bit CCP/ECCP module can timestamp events using Timer1 in 32 kHz crystal mode, while EUSART/SPI peripherals drive external sensors. Designers leverage the nanoWatt Sleep modes between samples to drop quiescent current, then wake on USB attach; the -40C to +85C industrial temperature range covers factory automation and outdoor logger deployments.
Recommandé
Battery-Powered Sensor Hub
The PIC18LF4455-I/ML is a strong fit for battery-powered sensor hubs because the nanoWatt Power-Saving modes (Idle, Sleep, Deep Sleep, Two-Speed Start-up) lower quiescent draw to single-digit uA, while the LF 2.0V-5.5V supply supports single-cell Li-ion operation. The 34 digital I/O pins host I2C/SPI sensor fan-out, the 16-bit Timer1 keeps real-time clocks via 32 kHz crystals, and the integrated USB SIE enables in-field firmware update by plugging into a host. The 10-bit A/D with internal voltage reference reads sensor outputs without an external reference IC, making the design compact and energy-efficient.
Recommandé
USB MIDI / Custom-Class Audio Adapter
Custom-class USB audio and MIDI adapters benefit from the PIC18LF4455-I/ML's Full-Speed USB SIE - on-chip PHY, 48 MHz core (12 MIPS), and 34 digital I/O pins to drive audio/MIDI jacks. The 24 KB Flash holds USB descriptors, MIDI event parser, and real-time interrupt handlers; the LF supply supports portable adapters powered from USB 5V or 3.3V rails. EUSART plus I2C peripherals address external DAC / EEPROM, while the 16-bit CCP/PWM can synthesize modest audio tones directly for beep / click alert tones, eliminating small audio signal generator ICs in cost-sensitive consumer designs.
Recommandé
USB Firmware Flasher / Bootloader Tool
In USB firmware-flashing production tools, the PIC18LF4455-I/ML acts as the host-side or target-side controller: it runs the USB HID bootloader on the target and a custom host programmer on a separate chip. The 256-byte EEPROM stores firmware version, while the 24 KB Flash holds the target-side bootloader and the optional ICSP pinout supports legacy programming. The LF supply works with 3.3V target boards without an external regulator, the 44-QFN package fits inside small programmer housings, and the on-chip USB SIE plus internal 3.3V LDO cuts BOM cost versus designs that need external USB transceivers.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC18LF4455-I/ML — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC18F4550-I/ML | PIC18F4455-I/ML | PIC18LF4550-I/ML |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8) | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same |
| Flash Memory | 24 KB | 32 KB | 24 KB | 32 KB |
| Supply Voltage | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) |
| Maximum Frequency | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) |
| USB | USB 2.0 FS + internal transceiver | USB 2.0 FS + internal transceiver | USB 2.0 FS + internal transceiver | USB 2.0 FS + internal transceiver |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Principaux différenciateurs
- Wider low-voltage supply range (2.0V-5.5V) than PIC18F4455-I/ML (vs PIC18F4455-I/ML)
- Smaller Flash footprint for cost-optimized designs (vs PIC18LF4550-I/ML)
- Identical peripheral set and USB SIE as PIC18F4550 family (vs PIC18F4550-I/ML)
Notes de conception
Place a 220 nF to 470 nF decoupling capacitor close to each VDD/VSS pair and a 10 uF bulk capacitor at the board's main VDD node. The internal VUSB 3.3V regulator requires a 220 nF decoupling capacitor on the VUSB pin; without it the USB SIE may fail USB-IF compliance. Powering the MCU from USB 5V bus-fed regulators is preferred to keep I/O at 5V while allowing VUSB to power the transceiver at 3.3V internally.
Estimated: in a 44-QFN 8x8 mm with minimum copper pour, theta_JA is approximately 35-40 C/W per Microchip datasheet thermal tables. At 48 MHz and 5.5V supply, full-load current draw is around 50 mA worst-case, dissipating roughly 0.275 W - well within thermal limits. For USB bus-powered designs in sealed enclosures with no airflow, increase ground copper pour on layers 1-4 to keep junction temperature rise below 15C above ambient.
Route the USB D+ and D- differential pair on the top layer with 90-ohm differential impedance, matched length within 150 mil, and do not place stubs or vias between the MCU and the USB connector. Keep the crystal traces (OSC1/OSC2) short, symmetric, and routed over a continuous ground plane; place the crystal within 5 mm of the OSC pins to avoid ground noise injection. Shielded-cap ground pour under the 44-QFN thermal pad must connect to the central exposed pad (EP) with at least 4 thermal vias for heat dissipation.
Never connect VUSB directly to VDD; the internal 3.3V regulator output must be left open or decoupled only, otherwise USB signaling becomes non-compliant. When migrating from the PIC18LF4455 to PIC18LF4550, verify that the application code fits within 24 KB Flash before recompiling, because the LF device has 8 KB less program memory. Always include the ICSP 5-pin header (MCLR, VDD, VSS, ICSPDAT, ICSPCLK) to allow in-circuit programming during board bring-up, even if production uses bootloader-based updates.
Informations de conformité
RoHS compliant per Microchip product page. No AEC-Q100 qualification - this part targets industrial/consumer embedded USB, not automotive. Lead-free QFN package, halogen-free per modern Microchip specifications.