PIC18F4450T-I/PT - 48MHz 8-bit USB MCU 16KB Flash | Microchip
Артикул: PIC18F4450T-I/PT ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $7.2 | $7,20 |
| 10 | $6.45 | $64,50 |
| 100 | $5.62 | $562,00 |
| 500 | $5.05 | $2.525,00 |
| 1.000 | $4.58 | $4.580,00 |
| 3.000 | $4.1 | $12.300,00 |
PIC18F4450T-I/PT Обзор
What is a PIC18F microcontroller? The PIC18F is Microchip Technology's high-performance 8-bit PIC microcontroller family, positioned above the PIC16F series in performance and below the PIC24/dsPIC 16-bit families. PIC18F devices follow the standard PIC taxonomy (microcontroller -> embedded controller -> semiconductor) and integrate flash memory, SRAM, EEPROM, A/D converters, and communication peripherals on a single CMOS die. The 4450 specifically targets USB-enabled human-interface and embedded-host-bridge designs where a full-speed (12 Mbps) USB device port replaces an external transceiver PHY.
Key features include an integrated Full-Speed USB 2.0 device controller with on-chip transceiver, 10-bit A/D converter with up to 13 input channels, two 8-bit and three 16-bit timers, two capture/compare/PWM modules, an Enhanced USART, MSSP (SPI/I2C), nanoWatt power management, and a 13-channel 10-bit ADC. The 44-pin TQFP package exposes 34 general-purpose I/O pins. The 5V operating range (4.2V to 5.5V) makes the part suitable for industrial and legacy 5V systems. Program memory is in-circuit serial programmable (ICSP) via two pins, supporting field updates without removing the part from the board.
Architecture-wise, the PIC18F4450 employs a Harvard RISC core with separate program and data buses, a hardware multiplier, and an 8-level deep hardware stack, allowing deterministic interrupt latency typical of PIC microcontrollers. The nanoWatt technology includes multiple idle and sleep modes that drop core current to microampere levels, with peripheral activity managed by independent clock gating. The USB SIE (Serial Interface Engine) handles the USB protocol in hardware, offloading packet framing, CRC, and endpoint management from the CPU.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridges, low-cost data loggers with analog sensor inputs, industrial control front-ends with Modbus RTU via RS-485, and consumer electronics with touch or capacitive sensing. The combination of USB, ADC, and 5V tolerance makes it a drop-in upgrade for legacy 5V systems adding modern connectivity.
When designing, ensure the VUSB pin is decoupled with a 220nF capacitor as recommended in the Microchip datasheet and that the D+/D- traces are routed as a 90-ohm differential pair. Firmware must initialize the USB PLL and oscillator configuration registers before the SIE will enumerate; review Microchip's USB framework documentation for ready-made HID, CDC, and vendor-class stacks.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement the Microchip datasheet rather than simply restating it.
Аналоги без доработки для PIC18F4450T-I/PT — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с PIC18F4450T-I/PT (тот же форм-фактор и посадочное место) — отличается по Timers, Operating Temperature, ADC, Package, I/O Pins.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
PIC18F4450-I/PT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PIC18F4550-I/PT
✅ Прямая замена✓ В наличии
$4.95 / шт.
Открыть даташит →PIC18F4455-I/PT
✅ Прямая замена✓ В наличии
$4.85 / шт.
Открыть даташит →PIC18F4458-I/PT
✅ Прямая замена✓ В наличии
$5.79 / шт.
Открыть даташит →PIC18F46J50-I/PT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PIC18F4450T-I/PT Максимальные параметры и электрические характеристики
| Core Architecture | PIC 8-bit RISC |
| Series | PIC18F |
| CPU Speed | 48 MHz (12 MIPS) |
| Program Memory | 16 KB (8K x 16) Flash |
| RAM | 768 bytes |
| Напряжение питания | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| USB | Full-Speed USB 2.0 Device with on-chip transceiver |
| ADC | 10-bit, up to 13 channels |
| Timers | 2 x 8-bit + 3 x 16-bit |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Communication | EUSART, MSSP (SPI/I2C) |
| Рабочая температура | -40 C to +85 C (Industrial) |
| Корпус | 44-TQFP (10x10 mm) |
| Тип монтажа | Surface Mount |
| Уровень MSL | 3 |
| Статус RoHS | Compliant |
| Programmable | In-Circuit Serial Programming (ICSP) |
| Power-Saving Modes | nanoWatt technology (Idle, Sleep, Low-Power modes) |
Конфигурация выводов PIC18F4450T-I/PT
| Контакт 1 | MCLR/VPP — Master Clear (reset) input / ICSP programming voltage |
| Контакт 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Контакт 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Контакт 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Контакт 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Контакт 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Контакт 7 | RA5/AN4/SS/HLVDIN — PORTA bit 5 / analog input 4 / SPI slave select / HLVD input |
| Контакт 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| Контакт 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Контакт 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| Контакт 11 | VDD — Positive supply voltage (5V) |
| Контакт 12 | VSS — Ground reference |
| Контакт 13 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock / PORTA bit 7 |
| Контакт 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / PORTA bit 6 |
| Контакт 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Контакт 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Контакт 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Контакт 18 | RC3 — PORTC bit 3 |
| Контакт 19 | RC4/D-/VMO — PORTC bit 4 / USB D- / USB VMO monitor output |
| Контакт 20 | RC5/D+/VPO — PORTC bit 5 / USB D+ / USB VPO monitor output |
| Контакт 21 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART synchronous clock |
| Контакт 22 | RC7/RX/DT — PORTC bit 7 / EUSART RX / EUSART synchronous data |
| Контакт 23 | RB0/AN12/INT0 — PORTB bit 0 / analog input 12 / external interrupt 0 |
| Контакт 24 | RB1/AN10/INT1 — PORTB bit 1 / analog input 10 / external interrupt 1 |
| Контакт 25 | RB2/AN8/INT2 — PORTB bit 2 / analog input 8 / external interrupt 2 |
| Контакт 26 | RB3/AN9/CCP2 — PORTB bit 3 / analog input 9 / CCP2 output |
| Контакт 27 | RB4/AN11/KBI0 — PORTB bit 4 / analog input 11 / interrupt-on-change bit 0 |
| Контакт 28 | RB5/KBI1/PGM — PORTB bit 5 / interrupt-on-change bit 1 / ICSP PGM |
| Контакт 29 | RB6/KBI2/PGC — PORTB bit 6 / interrupt-on-change bit 2 / ICSP clock |
| Контакт 30 | RB7/KBI3/PGD — PORTB bit 7 / interrupt-on-change bit 3 / ICSP data |
| Контакт 31 | VSS — Ground reference |
| Контакт 32 | VDD — Positive supply voltage (5V) |
| Контакт 33 | RD0 — PORTD bit 0 |
| Контакт 34 | RD1 — PORTD bit 1 |
| Контакт 35 | RD2 — PORTD bit 2 |
| Контакт 36 | RD3 — PORTD bit 3 |
| Контакт 37 | RD4 — PORTD bit 4 |
| Контакт 38 | RD5 — PORTD bit 5 |
| Контакт 39 | RD6 — PORTD bit 6 |
| Контакт 40 | RD7 — PORTD bit 7 |
| Контакт 41 | VUSB — USB 3.3V regulator output (decouple with 220 nF) |
| Контакт 42 | NC — Not connected (per datasheet) |
| Контакт 43 | NC — Not connected (per datasheet) |
| Контакт 44 | AVDD — Analog supply voltage (tie to VDD) |
Типичное применение
PIC18F4450T-I/PT подходит для 7 применениеs: USB HID Peripherals (Keyboard/Mouse/Custom Input), USB-to-UART / USB-to-SPI Bridge, Industrial Sensor Data Logger, USB Consumer Electronics (Toy / Wearable Dongle), Educational / Hobby USB Development Board, USB-Connected Medical Accessory (Non-Critical), USB-Controlled Lighting / Stage Effects.
USB HID Peripherals (Keyboard/Mouse/Custom Input)
The PIC18F4450T-I/PT is purpose-built for USB Human Interface Device peripherals thanks to its integrated Full-Speed USB 2.0 device SIE and on-chip transceiver, which remove the need for an external PHY and let BOM cost stay low. With 16KB flash and 768B RAM it fits the Microchip USB HID stack plus custom HID report descriptors for keyboards, mice, game controllers, or custom input panels. The 48MHz/12 MIPS core is sufficient for HID polling at 125 us intervals and debouncing without missing frames. The 5V tolerance makes the part a natural fit for legacy 5V keyboards or industrial input panels that need modern USB connectivity while preserving noise margins on long cable runs.
Рекомендуется
USB-to-UART / USB-to-SPI Bridge
A common industrial use case for the PIC18F4450T-I/PT is a CDC-based USB-to-UART bridge that turns a legacy RS-232 sensor or microcontroller into a USB device with no host-side driver changes. The integrated EUSART supports baud rates up to the MCU limit, while the MSSP peripheral can simultaneously run I2C or SPI for a USB-to-I2C/SPI gateway. The 10-bit ADC with 13 input channels enables a USB data-acquisition frontend that streams analog sensor readings at high speed. The 5V I/O tolerance simplifies level shifting to industrial 24V-isolated front-ends; the 44-TQFP footprint exposes 34 GPIO pins for status LEDs and flow-control handshakes typical of bridge designs.
Рекомендуется
Industrial Sensor Data Logger
The PIC18F4450T-I/PT serves as the controller in low-cost industrial data loggers that combine analog sensing with USB data offload. The 10-bit ADC with 13 input channels can digitize thermocouple-amplified or 4-20mA-conditioned signals, while the 16KB flash holds a file system and timestamp table for weeks of unattended logging. The nanoWatt sleep current under 1 uA lets a battery-powered logger wake on a timer interrupt, take a sample, and return to sleep between events. The USB SIE enables fast offload of the captured log to a PC host at Full Speed when the field technician plugs in, eliminating the need for a removable SD card slot in hazardous locations.
Рекомендуется
USB Consumer Electronics (Toy / Wearable Dongle)
Consumer USB dongles such as wireless audio receivers, configuration tools, and firmware update sticks leverage the PIC18F4450T-I/PT's compact 44-TQFP footprint and integrated USB transceiver. The 48MHz core can drive SPI-based wireless transceivers or LED matrices while simultaneously maintaining a USB enumeration as a CDC or vendor-class device. The ICSP programming interface allows factory firmware updates over the same USB pins used in production, simplifying the manufacturing test flow. The industrial -40C to +85C temperature rating ensures the part survives consumer-environment thermal stress, and the wide 4.2V to 5.5V supply range accepts USB bus power directly without additional regulation.
Рекомендуется
Educational / Hobby USB Development Board
The PIC18F4450T-I/PT is widely used in hobbyist and educational USB development kits because it combines USB, ADC, PWM, and ICSP programming in a single easy-to-solder TQFP package. The Microchip MPLAB X IDE and XC8 compiler provide a free toolchain, and the open-source USB stack (MLA / MCC USB) supports CDC, HID, and vendor-class examples ready for modification. The 5V tolerance simplifies lab-bench wiring with breadboard-friendly 5V sensors, while the 34 GPIO pins are sufficient for student projects involving LEDs, sensors, and character LCDs. For more capable students, the firmware can be upgraded to PIC18F4550-I/PT with no hardware change.
Рекомендуется
USB-Connected Medical Accessory (Non-Critical)
In non-critical medical accessories such as fitness wearables, breathing trainers, or USB-connected therapy reminder dongles, the PIC18F4450T-I/PT delivers the USB connectivity and ADC sampling required for sensor front-ends. The 10-bit ADC captures pulse, respiration, or temperature analog signals, and the USB device interface streams these readings to a host PC or tablet application. The industrial temperature rating covers the storage and operating ranges typical of consumer medical accessories, while the 5V tolerance accepts battery-charger-derived rails. For designs that must ship outside the consumer space, the automotive and medical-specific PIC18F variants remain in the same 44-TQFP family for migration paths.
Рекомендуется
USB-Controlled Lighting / Stage Effects
Stage lighting fixtures and DJ controllers often use the PIC18F4450T-I/PT as a USB-connected DMX or PWM controller because of its 2 CCP/PWM channels plus software-PWM on additional GPIO pins, and its integrated USB device port. A host PC application sends channel-update frames over USB CDC, and the PIC firmware generates hardware-timed PWM signals to drive LED strips or dimmer stages. The 48MHz core supports several hundred PWM updates per second without breaking the USB polling interval, while the 5V I/O tolerance simplifies driving FET-driver ICs directly. The 34 GPIO pins are ample for status LEDs, pushbuttons, and rotary-encoder inputs commonly used on stage controllers.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для PIC18F4450T-I/PT — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | PIC18F4450-I/PT | PIC18F4550-I/PT | PIC18F4455-I/PT | PIC18F4458-I/PT | PIC18F46J50-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Program Memory | 16 KB Flash | 16 KB Flash (same die) | 32 KB Flash (+100%) | 24 KB Flash (+50%) | 32 KB Flash (+100%) | 64 KB Flash (+300%) |
| RAM | 768 bytes | 768 bytes (same) | 2048 bytes (+166%) | 2048 bytes (+166%) | 2048 bytes (+166%) | 3892 bytes (+407%) |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 3.6 V (3.3V core) |
| USB | FS USB 2.0 Device + transceiver | FS USB 2.0 Device + transceiver (same) | FS USB 2.0 Device + transceiver | FS USB 2.0 Device + transceiver | FS USB 2.0 Device + transceiver | FS USB 2.0 Device + transceiver |
| ADC | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Ключевые отличия
- Same-package memory upgrade path (против PIC18F4550-I/PT)
- Industrial -40C to +85C temperature rating (против PIC18F4450-E/PT)
- On-chip Full-Speed USB transceiver eliminates external PHY (против FT232HL-REEL)
- 5V tolerance supports legacy industrial rails (против PIC18F46J50-I/PT)
Заметки по проектированию
The PIC18F4450T-I/PT's internal 3.3V USB regulator is brought out on the VUSB pin (pin 41). Per the Microchip datasheet, VUSB must be decoupled with a 220nF ceramic capacitor placed within 5mm of the pin to keep USB-enumeration noise off the analog rails. If the design is self-powered (not bus-powered), tie VUSB to VDD through a 10k resistor to disable the internal regulator. The main VDD rails require a 100nF decoupling capacitor close to each VDD/VSS pair plus a bulk 10uF tantalum or ceramic to handle USB attach current transients of up to 100 mA.
USB D+ (pin 20) and D- (pin 19) must be routed as a 90-ohm differential pair on the PCB with matched length (delta < 150 mil) and continuous reference plane on the layer below. Keep the pair away from switching signals such as PWM outputs or oscillator traces; a 4x guard trace to ground via stitching improves EMI margin per the USB 2.0 specification. The MCU should be placed within 25mm of the USB connector to keep the differential pair short, and the VUSB capacitor must sit between the MCU and connector without stubs.
Three common PIC18F4450T-I/PT firmware pitfalls: (1) forgetting to configure the oscillator to HS-PLL with the 48 MHz USB clock setting before USB stack init - the device will enumerate only as low-speed; (2) leaving the MCLR pin floating - the part will randomly reset; tie to VDD through a 10k resistor or use an MCP130 reset supervisor for production; (3) not enabling the GIE and PEIE bits before USB interrupt handling, causing the device to enumerate but stall on the first control transfer. Always initialize the CONFIG registers for WDT disable and LVP enable to match your ICSP programmer.
For ADC accuracy on the 10-bit converter, place a 100nF + 10uF decoupling pair close to the AVDD pin (pin 44) and route analog traces away from digital switching signals. The ADC can reach +/- 1 LSB accuracy when the source impedance is below 2.5 kohm and the acquisition time is configured for at least 1.5 us. Using AVSS as the analog ground return and tying it to VSS at a single point near the MCU reduces digital switching noise coupling into the analog measurements. The internal band-gap reference can be used for absolute readings but drifts +/- 5% over temperature, so calibrate in firmware for precision designs.
Информация о соответствии
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified; AEC-Q100 variants of this family are separate -Q1 part numbers.