PIC18F4550-I/P - 48MHz 8-Bit USB Microcontroller | Microchip
MPN： PIC18F4550-I/P ✓ 啟用中PIC18F4550-I/P 概覽
The PIC18F4550 belongs to the PIC18 family of high-performance RISC microcontrollers. Its enhanced Flash memory supports in-circuit programming and applications that require firmware updates. The device combines USB connectivity with I2C, SPI capable of operation up to 10 Mbit/s, and an asynchronous EUSART/LIN-capable serial port, making it useful for connected industrial and consumer equipment.
Key device characteristics include a 13-channel, 10-bit ADC, nanoWatt technology for reduced power consumption, and operation across an industrial temperature range described in the device documentation. The 40-pin DIP package is convenient for prototyping, educational platforms, through-hole assembly, and designs that require a socketed or leaded controller.
PIC18F4550-I/P is appropriate for USB peripheral controllers, instrumentation, data acquisition modules, serial bridges, communications equipment, and low-power embedded systems. Its combination of USB, multiple serial interfaces, ADC capability, and conventional through-hole packaging provides a practical platform for standalone control products.
For PCB design, follow the Microchip datasheet pin-description and package-drawing tables when assigning signals and laying out the board. The USB interface requires careful routing and the device datasheet should be consulted for clock, decoupling, input, and output requirements. The -I grade designation identifies the industrial-temperature version, while /P identifies the 40-pin DIP package.
This product page combines the device's principal connectivity, memory, processing, and application information with practical guidance for PCB implementation, firmware integration, and comparison with same-package PIC18 options. The manufacturer datasheet remains the controlling reference for pin assignments, absolute maximum ratings, timing, and electrical characteristics.
直接替換替代品，適用於 PIC18F4550-I/P — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18F4550-I/P （相同外形與佔位） — 差異在於 Package, ADC, Operating Temperature, Timers, Mounting Type.
PIC18F452-I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC18F4439-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F4550-I/P 最大額定值與電氣特性
| Microcontroller Type | 8-bit PIC18 enhanced-flash microcontroller |
| 最大時脈頻率 | 48 MHz |
| Program Flash Memory | 32 KB |
| RAM | 2 KB |
| 封裝 | 40-pin DIP (PDIP) |
| 安裝類型 | Through-hole |
| USB Interface | Full-speed USB, 12 Mbit/s |
| I2C Interface | Yes |
| SPI Interface | Yes, up to 10 Mbit/s |
| UART Interface | EUSART with LIN capability |
| ADC Resolution | 10-bit |
| ADC Channels | 13 channels |
| Architecture | Enhanced Flash PIC18 RISC |
| Low-Power Technology | nanoWatt technology |
PIC18F4550-I/P 40-pin dip (pdip) 腳位配置指南
PIC18F4550-I/P（40-pin dip (pdip) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： PIC18F4550-I/P.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC18F4550-I/P 適用於 6 應用s: USB Data-Acquisition Controller, USB-to-Serial Communications Bridge, Industrial Sensor Interface, USB Control Panel, Bootloader-Enabled USB Product, Low-Power Connected Embedded Instrument.
USB Data-Acquisition Controller
The PIC18F4550-I/P fits compact USB measurement equipment because it combines a 48 MHz 8-bit core with a 13-channel, 10-bit ADC, 32 KB of program Flash, 2 KB of RAM, and full-speed USB at 12 Mbit/s. The controller can acquire sensor inputs, perform control calculations, and return sampled data to a host over USB. Its 40-pin DIP package also simplifies prototype assembly and socketed laboratory construction. The main performance consideration is the modest conversion bandwidth of the 10-bit ADC, so analog front-end filtering, input protection, and acquisition timing should be matched to the measurement bandwidth.
推薦
USB-to-Serial Communications Bridge
The PIC18F4550-I/P is suitable for a USB-to-serial bridge because it provides full-speed USB alongside EUSART, I2C, and SPI interfaces. Firmware can receive commands over USB and relay them through EUSART, while the 32 KB Flash and 2 KB RAM accommodate protocol handling and buffering. The device's multiple communication peripherals make it practical for combining USB with industrial serial equipment. Designers should use buffered transceivers where cable-length, ground-reference, or logic-level requirements exceed the MCU pins' direct capabilities.
推薦
Industrial Sensor Interface
The PIC18F4550-I/P can serve as the controller in an industrial sensor interface when the system needs both local measurement and network connectivity. Its 13-channel 10-bit ADC supports multiple analog sensor inputs, while I2C and SPI provide access to external sensors, transceivers, and memory. The 48 MHz maximum clock supports responsive sampling and protocol handling. Industrial deployment should evaluate electrical transients, isolation, grounding, and environmental limits rather than assuming logic-level robustness; the -I grade identifies the industrial-temperature version.
推薦
USB Control Panel
The PIC18F4550-I/P is appropriate for a USB-connected control panel where buttons, indicators, relays, and analog adjustments must be coordinated by a host or embedded user interface. The 40-pin DIP package provides access to a broad I/O set, while USB removes the need for a separate host interface in the end product. Its 32 KB Flash offers room for control logic and USB firmware, and the 2 KB RAM supports temporary panel-state data. The design should debounce inputs and account for relay-driver isolation or transistor stages rather than driving unsuitable loads directly from MCU pins.
推薦
Bootloader-Enabled USB Product
The PIC18F4550-I/P is well suited to products that need field firmware updates through USB because it combines enhanced program Flash with a full-speed USB controller. A bootloader can occupy part of Flash, receive an image from a host, verify it, and transfer control to the application image. The same MCU can then operate as the product controller after startup. Firmware architecture must account for bootloader size, reset-vector placement, Flash write timing, and application boundaries. Production designs should also define update failure recovery to prevent an interrupted update from leaving the product unusable.
推薦
Low-Power Connected Embedded Instrument
The PIC18F4550-I/P fits low-power connected instruments because nanoWatt technology supports low-power operating modes while retaining USB, serial, and analog measurement resources. A battery- or bus-powered instrument can wake periodically, read sensors, communicate through USB or another serial interface, and return to a low-power state between measurements. The 48 MHz class processing rate allows event handling and signal conditioning without moving to a larger processor. Actual battery life depends on the selected sleep modes, active duty cycle, USB attachment, analog circuitry, and power-supply efficiency.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18F4550-I/P — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18F452-I/P | PIC18F4439-I/P |
|---|---|---|---|
| Package | 40-pin DIP (PDIP) | 40-pin DIP | 40-pin DIP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Temperature Grade | Industrial grade (-I) | Industrial grade (-I) | Industrial grade (-I) |
主要差異化特點
- Integrated full-speed USB connectivity (對比PIC18F452-I/P)
- Higher documented clock and memory combination (對比PIC18F4439-I/P)
- Multiple communication peripherals in one controller (對比PIC18F452-I/P)
設計說明
Place the 40-pin DIP footprint on a grid compatible with the selected socket or direct through-hole assembly process. Confirm pin-1 orientation against the manufacturer package drawing, especially when the board is populated by assembly equipment. Keep USB D+ and D- routing short and controlled, provide the required USB series resistance, and follow the datasheet and USB implementation guidance for connector and protection details.
Route the MCU supply and decoupling network as a compact cluster at the device pins. Place the required bulk and high-frequency capacitors according to the Microchip datasheet, maintaining short ground returns. USB operation adds a separately specified VBUS supply domain, so do not assume that the USB connector supply and the MCU core supply can be combined without checking the device's power architecture and absolute maximum limits.
Assign analog inputs away from switching nodes and high-current return paths, and provide a clean ground reference for the 10-bit ADC. The ESP8266 module requires particular care because RF and digital activity can disturb sensitive analog measurements. Confirm the ADC input range and sample-and-hold requirements from the datasheet before choosing resistor dividers, input protection components, or an external analog front end.
Do not substitute a controller solely because it uses a 40-pin DIP package. The PIC18F4550-I/P combination depends on its particular USB controller, pin multiplexing, memory configuration, oscillator options, and peripheral mapping. Review the complete pin-description table and the device's USB and programming requirements for the alternative. Firmware built for the PIC18F4550 should not be assumed to operate correctly on the PIC18F452-I/P or PIC18F4439-I/P.
合規資訊
The reviewed product listings do not explicitly state the requested compliance attributes. The industrial-temperature grade designation identifies the -I variant but does not by itself establish AEC-Q100 qualification.
