PIC18LF2450-I/ML - 8-Bit 48MHz 16KB Flash USB MCU | Microchip
MPN: PIC18LF2450-I/ML ✓ نشطPIC18LF2450-I/ML نظرة عامة
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, a CPU core, program and data memory, and a set of on-chip peripherals such as timers, ADC, communication ports, and (in this case) a USB device controller. The PIC18 family is Microchip's high-performance 8-bit line that adds C-friendly architectural extensions, a 16-bit instruction word, hardware multiplier, and linear program memory up to 2 MB. The LF prefix denotes the extended low-voltage process that allows operation down to 2.0V, which is critical for battery-powered and energy-harvesting designs.
Key features include hardware USB 2.0 Full-Speed (12 Mbps) device/OTG support with on-chip transceiver, 16 KB self-programmable Flash, 768 B SRAM, 256 B EEPROM, 10-bit ADC with 10 channels, two analog comparators, two CCP modules, one Enhanced USART, one MSSP (SPI/I2C), and four timer modules. The 28-QFN package reduces PCB footprint by approximately 60% versus a 28-SOIC footprint while exposing a thermal pad that lowers theta-JA and improves high-current I/O performance.
Architecturally, the part uses a Harvard cache architecture with separate program and data buses, a 32-level hardware stack, and an 8x8 hardware multiply that accelerates 16-bit math in a single cycle. The integrated USB SIE handles NRZI encoding, bit stuffing, and CRC5/CRC16 in hardware, eliminating external PHY chips for low-speed and full-speed USB.
Typical applications include USB HID peripherals (keyboards, mice, gamepads), USB-to-UART bridges, low-voltage sensor nodes, industrial data loggers, and consumer electronics that need a low-pin-count USB device interface. The LF voltage range (2.0-5.5V) makes the part a strong fit for single-cell Li-ion powered devices as well as 3.3V and 5V industrial buses.
Design consideration: the QFN package requires a via-array thermal pad soldered to a copper pour for the datasheet-specified thermal performance. Programming/debug is supported natively by Microchip's MPLAB X IDE, MPLAB XC8 compiler, and PICkit or ICD tools.
This page synthesizes verified distributor pricing, same-family drop-in alternatives in the same 28-QFN footprint, and practical design notes not consolidated on the manufacturer datasheet.
بدائل مباشرة لـ PIC18LF2450-I/ML — 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 PIC18LF2450-I/ML (نفس عامل الشكل والبصمة) — يختلف في ADC, Operating Temperature, Package, Timers, Mounting Type.
PIC18F2450-I/ML
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF2450T-I/ML
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF2550-I/ML
📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18F2550-I/ML
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF2420-I/ML
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF2450-I/ML الحدود القصوى والخصائص الكهربائية
| Architecture | PIC18 8-bit RISC |
| CPU Core | PIC18 |
| Max CPU Frequency | 48 MHz (12 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data Memory (SRAM) | 768 B |
| EEPROM | 256 B |
| I/O Pins | 23 |
| ADC | 10-bit, 10 channels |
| USB | USB 2.0 Full-Speed (12 Mbps) Device/OTG with on-chip transceiver |
| جهد التغذية | 2.0 V to 5.5 V |
| درجة حرارة التشغيل | -40C to +85C (Industrial) |
| العلبة | 28-pin QFN (6x6 mm) with EP |
| نوع التركيب | Surface Mount |
| Timers | 4 (Timer0/1/2/3) |
| Communication | 1x EUSART, 1x MSSP (SPI/I2C) |
| Comparators | 2 |
| CCP/ECCP Modules | 2 CCP |
| حالة RoHS | Compliant |
| Lead-Free | Yes |
تكوين أطراف PIC18LF2450-I/ML
| دبوس 1 | MCLR/RE3 — Master Clear (reset) input or digital input only |
| دبوس 2 | RA0/AN0 — PORTA bit 0 / ADC analog input 0 |
| دبوس 3 | RA1/AN1 — PORTA bit 1 / ADC analog input 1 |
| دبوس 4 | RA2/AN2/VREF- — PORTA bit 2 / ADC input / DAC negative reference |
| دبوس 5 | RA3/AN3/VREF+ — PORTA bit 3 / ADC input / DAC positive reference |
| دبوس 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| دبوس 7 | RA5/AN4 — PORTA bit 5 / ADC analog input 4 |
| دبوس 8 | VSS — Ground reference |
| دبوس 9 | OSC1/CLKI/RA7 — Crystal oscillator input or external clock input / PORTA bit 7 |
| دبوس 10 | OSC2/CLKO/RA6 — Crystal oscillator output or clock output / PORTA bit 6 |
| دبوس 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| دبوس 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| دبوس 13 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| دبوس 14 | VUSB — USB internal transceiver 3.3V supply (bypass required) |
| دبوس 15 | RC4/D- — PORTC bit 4 / USB D- data line |
| دبوس 16 | RC5/D+ — PORTC bit 5 / USB D+ data line |
| دبوس 17 | RC6/TX/CK — PORTC bit 6 / USART TX / clock output |
| دبوس 18 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| دبوس 19 | VSS — Ground reference (second VSS pin) |
| دبوس 20 | VDD — Positive supply voltage |
| دبوس 21 | RB0/AN12/INT0 — PORTB bit 0 / analog input 12 / external interrupt 0 |
| دبوس 22 | RB1/AN10/INT1 — PORTB bit 1 / analog input 10 / external interrupt 1 |
| دبوس 23 | RB2/AN8/INT2 — PORTB bit 2 / analog input 8 / external interrupt 2 |
| دبوس 24 | RB3/AN9/CCP2 — PORTB bit 3 / analog input 9 / CCP2 alt |
| دبوس 25 | RB4/AN11 — PORTB bit 4 / analog input 11 |
| دبوس 26 | RB5/AN13 — PORTB bit 5 / analog input 13 |
| دبوس 27 | RB6/ICSPCLK — PORTB bit 6 / ICSP clock (programming/debug) |
| دبوس 28 | RB7/ICSPDAT — PORTB bit 7 / ICSP data (programming/debug) |
التطبيقات النموذجية
PIC18LF2450-I/ML مناسب لـ 6 التطبيقs: USB HID Peripherals (Keyboard, Mouse, Gamepad), USB-to-UART Bridge, Low-Voltage Sensor Node, Industrial Data Logger with USB, Consumer Audio Dongle (USB Audio), USB Connected Lighting Controller.
USB HID Peripherals (Keyboard, Mouse, Gamepad)
The PIC18LF2450-I/ML is a strong fit for USB HID peripherals because its integrated USB 2.0 Full-Speed SIE handles enumeration, polling, and report descriptors entirely in hardware, freeing the PIC18 CPU for scan logic. With 16 KB Flash it comfortably fits HID boot-loader plus a standard keyboard/mouse HID report stack, and 768 B SRAM is sufficient for ring-buffered scan matrices up to 256 keys. The 23 I/O pins handle a 13x8 keyboard scan matrix directly without an I/O expander. The LF 2.0-5.5V range lets a single-cell Li-ion power the device while USB VBUS powers the upstream port - a typical dual-rail topology where the LF device shines versus the F variant that requires 4.2V minimum.
موصى به
USB-to-UART Bridge
The PIC18LF2450-I/ML serves as a USB-to-UART bridge by enumerating as a CDC-ACM device on the USB side and driving the on-chip Enhanced USART (EUSART) on the serial side. According to the Verified Web Data, the part runs the PIC18 instruction set at up to 48 MHz (12 MIPS), which is more than enough headroom to handle 921.6 kbps UART throughput plus USB polling overhead. The 768 B SRAM holds circular TX/RX buffers, and the 16 KB Flash accommodates the CDC stack plus a small command parser. The LF voltage range allows the bridge to be powered directly from USB (5V) or a 3.3V rail without a separate regulator.
موصى به
Low-Voltage Sensor Node
The PIC18LF2450-I/ML operates directly from 2.0-5.5V, which is the same range as a single-cell Li-ion, 2x AA, or a 3.3V regulated sensor supply. According to the Verified Web Data, the 10-channel 10-bit ADC samples analog sensors (temperature, light, voltage) at up to approximately 100 ksps, sufficient for typical environmental monitoring. The two on-chip comparators enable threshold-based wake-up from sleep without waking the CPU, and the four timers (Timer0/1/2/3) handle pulse counting and PWM for actuators. USB is also available as a debug-and-data-upload port - the LF voltage range means no boost regulator is required.
موصى به
Industrial Data Logger with USB
The PIC18LF2450-I/ML supports industrial data-logger designs where the part stores time-stamped measurements in its 256-byte EEPROM or streams them over USB to a host PC. The 48 MHz CPU and 16 KB Flash run a small FAT12/14 USB-MSD stack or a proprietary logging protocol, while the 10-bit ADC samples analog inputs from thermocouples (with external conditioning), pressure sensors, and 4-20 mA loops. The -40C to +85C industrial temperature rating matches factory floor requirements, and the LF 2.0-5.5V range supports 24V industrial buses with a step-down regulator on the front end.
موصى به
Consumer Audio Dongle (USB Audio)
The PIC18LF2450-I/ML is used in low-cost USB audio-class dongles that pull digital audio from a PC and forward it to an external DAC via I2S or PWM. Although the PIC18 does not have a dedicated I2S peripheral, the MSSP can drive SPI-mode DACs and the on-chip CCP/PWM modules can synthesize 1-bit PDM audio at lower fidelity. According to the Verified Web Data, 16 KB Flash fits a USB Audio 1.0 descriptor set plus a small audio processing loop. The integrated USB transceiver eliminates external PHY and pull-up resistors, reducing BOM cost versus an external USB bridge chip.
موصى به
USB Connected Lighting Controller
The PIC18LF2450-I/ML can act as a USB-connected DMX512 or LED driver controller, where the host PC streams lighting commands over USB and the PIC18 drives LED strips via its CCP/PWM outputs, MSSP (SPI), or external shift-register chains. The 23 I/O pins support multiple SPI-driven APA102 or WS2801 LED chains in parallel, and the 48 MHz CPU maintains smooth chases at thousands of LEDs per chain. According to the Microchip datasheet, the 2.0-5.5V LF range supports direct 3.3V LED strip powering plus USB VBUS detection for host-presence logic. This application exploits the part's USB, timers, and PWM in a low-BOM-cost topology.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LF2450-I/ML — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18F2450-I/ML | PIC18LF2450T-I/ML | PIC18LF2550-I/ML | PIC18F2550-I/ML | PIC18LF2420-I/ML |
|---|---|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 16 KB | 16 KB | 16 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 768 B | 768 B | 768 B | 2048 B | 2048 B | 768 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Supply Voltage | 2.0V to 5.5V | 4.2V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 4.2V to 5.5V | 2.0V to 5.5V |
| USB Peripheral | Yes (USB 2.0 Full-Speed) | Yes (USB 2.0 Full-Speed) | Yes (USB 2.0 Full-Speed) | Yes (USB 2.0 Full-Speed) | Yes (USB 2.0 Full-Speed) | No (USB removed) |
| ADC Channels | 10 channels x 10-bit | 10 channels x 10-bit | 10 channels x 10-bit | 10 channels x 10-bit | 10 channels x 10-bit | 10 channels x 10-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
أبرز الفروقات
- Hardware USB 2.0 Full-Speed SIE with on-chip transceiver (مقابلPIC18LF2420-I/ML)
- Extended low-voltage operation 2.0-5.5V (مقابلPIC18F2450-I/ML)
- 48 MHz CPU with 12 MIPS throughput (مقابلPIC18LF2420-I/ML)
ملاحظات التصميم
The 28-QFN package uses an exposed thermal pad (EP) on the underside that must be soldered to a copper pour for both thermal dissipation and electrical reference. Per the Microchip datasheet, the EP is internally connected to VSS, so the pour must be ground-referenced. Recommended pattern: at least 10 thermal vias (0.3 mm drill) connecting the EP to an internal ground plane, and a top-side copper pour of at least 25 mm x 25 mm. Without proper EP soldering, the part's theta-JA rises significantly and the device can overheat at high I/O drive currents.
The PIC18LF2450-I/ML requires two supply rails: VDD (2.0-5.5V on pin 20) and VUSB (3.0-3.6V on pin 14). According to the Microchip datasheet, VUSB must be present and properly bypassed with a 220 nF + 10 uF combination for the USB SIE to operate. When the application is bus-powered, derive VUSB from VBUS through a low-dropout regulator; when self-powered, generate VUSB locally. Note: VUSB and VDD can share a regulator only if the entire system runs at 3.0-3.6V - if VDD > 3.6V, separate rails are mandatory.
Do not assume any PIC18Fxxxx part is pin-compatible with the PIC18LF2450-I/ML - the LF and F prefix indicates different voltage ranges, and other family members may differ in USB, ADC, or I/O count. According to the Verified Web Data and the Microchip 28-pin compatibility chart, verify the exact 28-pin PIC datasheet before swapping parts. Also, the QFN package requires pick-and-place accuracy below 0.05 mm; poorly placed parts cause weak solder joints on the EP that can pass initial electrical test but fail in the field under thermal stress.
معلومات الامتثال
RoHS compliant per Microchip product page. Not AEC-Q100 qualified (industrial grade only, -40C to +85C). Halogen-free status not explicitly listed in the Verified Web Data.
