PIC18F448-I/L - 8-bit PIC MCU, 16KB Flash, CAN, 40MHz | Microchip
MPN： PIC18F448-I/L ✗ 停產PIC18F448-I/L 概覽
An 8-bit microcontroller is a single-chip computer built around an 8-bit data bus that executes one byte per instruction cycle, paired with a richer peripheral set than smaller 4-bit or 8-bit predecessors. The PIC18F family sits at the top of Microchip's legacy 8-bit portfolio, belonging to the broader category of microcontrollers -> microcontrollers (MCUs) -> microcontrollers and microprocessors -> semiconductors. Enhanced Flash variants add self-programmability, larger SRAM, and on-chip peripherals like CAN, USB, and 10-bit ADC, distinguishing them from baseline PIC16F parts.
Key features of the PIC18F448-I/L include the integrated ECAN module (CAN 2.0B Active) for automotive and industrial networking, a 10-bit ADC up to 8 channels, capture/compare/PWM (CCP) modules for motor and lighting control, an internal RC oscillator with PLL support, and Microchip's nanoWatt power-managed sleep modes. These features make it well-suited for embedded nodes that require deterministic CAN communication alongside standard serial interfaces.
Architecture-wise, the part uses a Harvard-based RISC core with 16-bit instructions and 8-bit data path, providing 75+ instructions, an 8x8 hardware multiplier, and a 32-level hardware stack. The integrated CAN module reduces BOM cost and PCB area versus external CAN controllers, which historically required a separate SPI/I2C-attached IC.
Typical applications include automotive body control modules, industrial CAN sensor hubs, HVAC fan controllers, and standalone CAN bridge/gateway nodes in factory automation. The 40-pin I/O count and CAN peripheral also suit building automation fan-out devices and small appliances requiring fieldbus networking.
A key design consideration is migrating from this part to the pin-compatible PIC18F458 (double the Flash, 32KB vs 16KB) for firmware headroom without PCB rework. Lifetime-buy planning is recommended - this part is marked OBSOLETE in distributor catalogs as of 2026-09-27 and inventory should be validated at order entry.
This page synthesizes distributor stock, parametric alternatives in the PIC18Fxx8 family, and engineering notes compiled from Microchip datasheets and reference designs - content not found on any single distributor page.
直接替換替代品，適用於 PIC18F448-I/L — 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： PIC18F448-I/L （相同外形與佔位） — 差異在於 Package, Timers, Mounting Type, I/O Pins, Operating Temperature.
PIC18F458-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC18F4480-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18F448-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F448-I/L 最大額定值與電氣特性
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data Memory (SRAM) | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz |
| 工作溫度 | -40C to +85C (Industrial, -I) |
| I/O Pins | 34 (of 44-pin package) |
| 封裝 | 44-pin PLCC (L) |
| CAN Module | ECAN (CAN 2.0B Active) |
| ADC | 10-bit, up to 8 channels |
| Serial Interfaces | CAN, I2C, SPI, UART/USART |
| 安裝類型 | Surface Mount (PLCC socket-compatible) |
| RoHS 狀態 | Compliant (per distributor) |
PIC18F448-I/L 腳位配置
| 腳位 1 | MCLR/VPP/RE3 — Master Clear (active-low reset) / ICSP programming voltage / PORT E bit 3 |
| 腳位 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 腳位 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 腳位 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| 腳位 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| 腳位 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 腳位 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| 腳位 8 | RE0/RD — PORTE bit 0 / Parallel-port read control |
| 腳位 9 | RE1/WR — PORTE bit 1 / Parallel-port write control |
| 腳位 10 | RE2/CS — PORTE bit 2 / Parallel-port chip select |
| 腳位 11 | VDD — Positive supply voltage |
| 腳位 12 | VSS — Ground |
| 腳位 13 | OSC1/CLKI/RA7 — Oscillator crystal input / external clock / PORTA bit 7 |
| 腳位 14 | OSC2/CLKO/RA6 — Oscillator crystal output / clock output / PORTA bit 6 |
| 腳位 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| 腳位 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| 腳位 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| 腳位 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 腳位 19 | RD0/PSP0/C1IN+ — PORTD bit 0 / Parallel Slave Port bit / Comparator 1 in+ |
| 腳位 20 | RD1/PSP1/C1IN- — PORTD bit 1 / PSP bit / Comparator 1 in- |
| 腳位 21 | RD2/PSP2/C2IN+ — PORTD bit 2 / PSP bit / Comparator 2 in+ |
| 腳位 22 | RD3/PSP3/C2IN- — PORTD bit 3 / PSP bit / Comparator 2 in- |
| 腳位 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 腳位 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| 腳位 25 | RC6/TX/CK — PORTC bit 6 / UART TX / USART clock |
| 腳位 26 | RC7/RX/DT — PORTC bit 7 / UART RX / USART data |
| 腳位 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit |
| 腳位 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit |
| 腳位 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit |
| 腳位 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit |
| 腳位 31 | VSS — Ground |
| 腳位 32 | VDD — Positive supply voltage |
| 腳位 33 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| 腳位 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| 腳位 35 | RB2/INT2/CANTX — PORTB bit 2 / External interrupt 2 / CAN bus transmit |
| 腳位 36 | RB3/INT3/CANRX — PORTB bit 3 / External interrupt 3 / CAN bus receive |
| 腳位 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| 腳位 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| 腳位 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 腳位 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| 腳位 41 | NC — Not connected (per datasheet) |
| 腳位 42 | NC — Not connected (per datasheet) |
| 腳位 43 | NC — Not connected (per datasheet) |
| 腳位 44 | NC — Not connected (per datasheet) |
典型應用
PIC18F448-I/L 適用於 6 應用s: Automotive CAN Body Control Modules, Industrial CAN Sensor Hubs, HVAC Fan and Blower Controllers, CAN Bridge and Gateway Nodes, Standalone Appliance Controllers, Lighting and LED Dimming Nodes.
Automotive CAN Body Control Modules
The PIC18F448-I/L's integrated ECAN 2.0B module and 40 MHz core make it well-suited for automotive body and chassis nodes such as door, mirror, or seat controllers. On the CAN bus it offers 11-bit and 29-bit identifier support plus acceptance filters, eliminating the need for an external CAN transceiver-side controller. With 16KB Flash and 768 bytes SRAM it fits the typical 4-8 KB code footprint of body-control firmware; the 44-pin PLCC exposes 34 digital I/O for switches, motors, and LEDs. Industrial temperature grade (-40C to +85C) covers cabin and under-hood placement.
推薦
Industrial CAN Sensor Hubs
The PIC18F448-I/L's 10-bit ADC and CAN interface let it act as a sensor aggregation node for industrial CANopen and DeviceNet systems. The 40 MHz core samples multiple analog channels, applies linearization in software, and broadcasts the result as CAN messages at 250 or 500 kbps. With 16KB Flash it absorbs the typical CANopen stack and OEM application code; -40C to +85C operation supports factory and outdoor cabinet environments. The PLCC-44 socket also simplifies field replacement in legacy installations.
推薦
HVAC Fan and Blower Controllers
The PIC18F448-I/L's CCP/ECCP modules drive PWM outputs for HVAC blower and fan motor control, while the ADC reads thermistor or 0-10V input signals. At 40 MHz the core executes PI control loops with sub-millisecond update rates for smooth variable-speed fan response. The integrated ECAN allows the unit to communicate set-points and status with a building automation controller. Industrial -I temperature grade handles unconditioned mechanical-room environments.
推薦
CAN Bridge and Gateway Nodes
For connecting legacy CAN subnets to a backplane bus, the PIC18F448-I/L acts as a low-cost dual-CAN bridge using one external MCP2515/MCP2551 plus its internal ECAN. The 16KB Flash stores bridge/routing logic and CANopen-style gateway tables while the 768-byte SRAM buffers messages between buses. 34 digital I/O plus SPI and I2C spare buses support local I/O expansion for diagnostic-status LEDs and configuration EEPROM via I2C.
推薦
Standalone Appliance Controllers
Small appliances such as commercial coffee machines and vending dispensers benefit from the PIC18F448-I/L's mixed analog and digital I/O plus CAN connectivity for fleet telemetry. The 10-bit ADC reads temperature, pressure, and level sensors; the ECCP drives solenoid valves via PWM; the UART connects to a payment or display module. The 44-pin PLCC socket and well-documented ICSP programming streamline manufacture and field firmware updates via Microchip's bootloader ecosystem.
推薦
Lighting and LED Dimming Nodes
Architectural lighting systems use the PIC18F448-I/L to drive multiple LED strings via CCP/PWM channels while reporting status over CAN or DMX. The 40 MHz core supports high-resolution dimming with 8-10 bit PWM steps; 16KB Flash absorbs DMX-to-CAN bridging logic and color-mixing algorithms. With 34 I/O the part addresses 4-6 LED channels plus user controls; -40C to +85C operation handles sealed fixture temperatures.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18F448-I/L — 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 | PIC18F458-I/L | PIC18F4480-I/PT | PIC18F448-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PLCC-44 (L) | PLCC-44 (L) - same | TQFP-44 (PT) - same pinout different footprint | TQFP-44 (PT) - same die, different footprint |
| Program Memory (Flash) | 16 KB | 32 KB (+100%) | 16 KB (same) | 16 KB (same) |
| Data Memory (SRAM) | 768 bytes | 1536 bytes (+100%) | 768 bytes (same) | 768 bytes (same) |
| CPU Clock | 40 MHz | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) |
| CAN Module | ECAN 2.0B Active | ECAN 2.0B Active | ECAN 2.0B Active | ECAN 2.0B Active |
| I/O Pins | 34 | 34 | 34 | 34 |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
主要差異化特點
- Doubling Flash and RAM headroom in the same PLCC-44 footprint (對比PIC18F458-I/L)
- Free migration path to lower-cost TQFP variant for new designs (對比PIC18F448-I/PT)
- Smaller die variant with identical peripherals and CAN (對比PIC18F4480-I/PT)
設計說明
The PIC18F448-I/L operates from 4.2V to 5.5V on the VDD pins (11 and 32); both VDD/VSS pairs must be decoupled with 100 nF ceramic capacitors placed within 5 mm of each pin, plus a single bulk 10 uF tantalum or ceramic close to the regulator. Brown-out reset is enabled via configuration bits to ensure a clean startup during power-rail ramp.
For ECAN bus signal integrity, the CAN TX/RX traces (RB2/RB3) should be routed with characteristic impedance of 60 ohm matching the MCP2551, kept short, and isolated from noisy switching traces. Place the optional common-mode choke near the transceiver DB9 connector. The 44-pin PLCC socket allows field replacement - keep clearance around the IC and socket for IC extraction tools.
Do not confuse the -L (PLCC-44) and -PT (TQFP-44) variants when ordering spares - both exist for the PIC18F448 die and are NOT drop-in due to package differences. Also note this part is OBSOLETE as of 2026-09-27 per distributor listings; users should evaluate migration to PIC18F458-I/PT, PIC18FXXK80, or dsPIC33F families for new designs where long-term Microchip support matters.
合規資訊
RoHS and lead-free status confirmed per distributor listings (Mouser, DigiKey). AEC-Q100 not specifically qualified - the -I (industrial) variant is for -40C to +85C, not automotive-grade. For automotive CAN nodes use AEC-Q100-qualified Microchip PIC18FXXK80 family.
