PIC18LF448-I/PT - 8-Bit 40MHz 16KB Flash MCU w/ CAN | Microchip
MPN: PIC18LF448-I/PT ✓ Hoạt độngPIC18LF448-I/PT Tóm tắt
This device belongs to the broader microcontroller (MCU) category - a programmable semiconductor that combines CPU core, memory, and peripherals in a single IC. Within that hierarchy, it sits at: MCU -> 8-bit MCU -> PIC18 family -> PIC18F sub-family -> PIC18LF448 variant. The PIC18LF448 specifically integrates a CAN 2.0B controller, distinguishing it from the PIC18F448 variant mainly through the LF (low-power) voltage operating range that supports 2.0V-5.5V operation.
Key features include 34 I/O pins, hardware CAN 2.0B module, USART, MSSP (SPI/I2C), 10-bit ADC with up to 8 channels, nanoWatt power management for low-power operation, ICD (In-Circuit Debug) support, and 100K erase/write cycle Flash endurance. The 'LF' suffix indicates the low-voltage core supporting operation down to 2.0V, ideal for battery-powered and energy-conscious designs.
Typical applications include industrial CAN bus nodes, automotive body electronics, sensor interfaces, building automation, HVAC controls, and embedded control systems requiring networked communication. The integrated CAN peripheral eliminates the need for an external CAN transceiver MCU-side controller, reducing BOM cost and PCB area.
When designing with this MCU, pay attention to the CAN bus termination (typically 120 ohm at each end of the bus) and ensure the external CAN transceiver (e.g., MCP2551 or MCP2561) is properly matched. The 40 MHz maximum oscillator frequency requires careful PCB layout for crystal placement to minimize EMI.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF448-I/PT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC18LF448-I/PT (cùng hình factor và footprint) — khác nhau ở Package, ADC, Core Architecture, Timers, I/O Pins.
PIC18LF458-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4480T-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4458-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4455T-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4450T-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4431T-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF448-I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit RISC) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| CAN Module | CAN 2.0B (1 controller) |
| UART/USART | 1x USART |
| SPI/I2C (MSSP) | 1x MSSP (SPI or I2C) |
| Timers | 4 (Timer0/1/2/3) |
| Hộp | 44-TQFP (10x10 mm) |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF448-I/PT
| Chân 1 | RC0/T1OSO/T1CKI — I/O port / Timer1 oscillator output |
| Chân 2 | RC1/T1OSI/CCP2 — I/O port / Timer1 oscillator input / CCP2 |
| Chân 3 | RC2/CCP1 — I/O port / CCP1 |
| Chân 4 | RC3/SCK/SCL — I/O port / SPI clock / I2C clock |
| Chân 5 | RC4/SDI/SDA — I/O port / SPI data in / I2C data |
| Chân 6 | RC5/SDO — I/O port / SPI data out |
| Chân 7 | RC6/TX/CK — I/O port / USART TX / clock |
| Chân 8 | RC7/RX/DT — I/O port / USART RX / data |
| Chân 9 | RD0/PSP0/C1IN+ — I/O port / Parallel Slave Port / CAN RX |
| Chân 10 | RD1/PSP1/C1IN- — I/O port / PSP / comparator |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | VSS — Ground |
| Chân 13 | OSC1/CLKI/RA7 — Oscillator input / external clock |
| Chân 14 | OSC2/CLKO/RA6 — Oscillator output |
| Chân 15 | RA0/AN0 — I/O port / analog input 0 |
| Chân 16 | RA1/AN1 — I/O port / analog input 1 |
| Chân 17 | RA2/AN2/VREF- — I/O port / analog input 2 / VREF- |
| Chân 18 | RA3/AN3/VREF+ — I/O port / analog input 3 / VREF+ |
| Chân 19 | RA4/T0CKI/C1OUT — I/O port / Timer0 clock / comparator out |
| Chân 20 | RA5/AN4/SS/HLVDIN — I/O port / analog / SPI SS / HLVD |
| Chân 21 | RE0/RD/AN5 — I/O port / read control / analog |
| Chân 22 | RE1/WR/AN6 — I/O port / write control / analog |
| Chân 23 | RE2/CS/AN7 — I/O port / chip select / analog |
| Chân 24 | RE3 — I/O port (digital only) |
| Chân 25 | RB0/INT0/CCP2 — I/O port / external interrupt 0 |
| Chân 26 | RB1/INT1 — I/O port / external interrupt 1 |
| Chân 27 | RB2/INT2/CANTX — I/O port / external interrupt 2 / CAN TX |
| Chân 28 | RB3/CANRX — I/O port / CAN RX |
| Chân 29 | RB4 — I/O port (interrupt-on-change) |
| Chân 30 | RB5/PGM — I/O port / LVP program |
| Chân 31 | VSS — Ground |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB6/PGC — I/O port / ICD clock |
| Chân 34 | RB7/PGD — I/O port / ICD data |
| Chân 35 | RD2/PSP2 — I/O port / PSP |
| Chân 36 | RD3/PSP3 — I/O port / PSP |
| Chân 37 | RD4/PSP4 — I/O port / PSP |
| Chân 38 | RD5/PSP5 — I/O port / PSP |
| Chân 39 | RD6/PSP6 — I/O port / PSP |
| Chân 40 | RD7/PSP7 — I/O port / PSP |
| Chân 41 | RC0 — I/O port (alternate) |
| Chân 42 | RC1 — I/O port (alternate) |
| Chân 43 | RC2 — I/O port (alternate) |
| Chân 44 | RC3 — I/O port (alternate) |
Ứng dụng tiêu biểu
PIC18LF448-I/PT phù hợp cho 6 Áp dụngs: Industrial CAN Bus Nodes, Automotive Body Electronics, Building Automation & HVAC, Sensor Interface Modules, Embedded Control with Networked Communication, Medical & Diagnostic Devices.
Industrial CAN Bus Nodes
The PIC18LF448-I/PT is purpose-built for industrial CAN bus networks such as CANopen and DeviceNet slave nodes. Its integrated CAN 2.0B controller with hardware acceptance filters and message assembly buffers handles 1 Mbit/s CAN traffic without CPU intervention, freeing the 8-bit core for application logic. With 16KB Flash and 768B RAM, the MCU comfortably runs CANopen CIA 401 I/O profile stacks or DeviceNet group 2 slave firmware. The 2.0V-5.5V supply range supports 24V industrial backplanes with on-board regulation. An external MCP2551 CAN transceiver converts the on-chip CAN TX/RX differential signaling to the physical bus.
Được đề xuất
Automotive Body Electronics
In automotive body control modules such as door, seat, mirror, and lighting controllers, the PIC18LF448-I/PT provides networked CAN communication between ECUs at low cost. The hardware CAN peripheral handles 500 kbit/s body CAN traffic reliably, while 34 I/O pins drive LEDs, switches, and motor drivers directly. The 10-bit ADC reads sensor inputs (temperature, position, current) for diagnostics. Operating from -40C to +85C industrial temperature range, the MCU tolerates cabin and engine-bay-adjacent thermal environments. The nanoWatt power-down modes reduce quiescent current below 1 uA for key-off sleep compliance, extending battery life in parked vehicles.
Được đề xuất
Building Automation & HVAC
The PIC18LF448-I/PT excels in building automation controllers where CAN networking interconnects thermostats, VAV dampers, fan coil units, and chiller controls. The integrated CAN controller eliminates the need for separate communication ASICs, while 16KB Flash stores BACnet or LonWorks protocol stacks for HVAC gateways. The 10-bit ADC with 8 channels reads multiple temperature sensors (NTC or digital via I2C), humidity sensors, and pressure transducers for closed-loop HVAC control. Low-voltage operation (2.0V minimum) supports 24VAC-powered systems with simple rectification, while nanoWatt modes reduce standby power below ENERGY STAR thresholds for green-building compliance.
Được đề xuất
Sensor Interface Modules
For industrial sensor interface modules reading analog and digital field devices, the PIC18LF448-I/PT provides 8 channels of 10-bit ADC, MSSP SPI/I2C master capability, and CAN uplink to the factory network. The MCU digitizes 4-20mA current-loop sensors via a shunt resistor, then broadcasts engineering-unit values over CANopen PDOs to the PLC. With 16KB Flash and 768B RAM, the device handles sensor linearization, calibration tables, and diagnostic state machines. The 40 MHz core executes these tasks with 100 ms cycle times typical. The PIC18LF448-I/PT's 2.0V-5.5V supply range simplifies integration with 24V industrial sensors using onboard DC-DC converters.
Được đề xuất
Embedded Control with Networked Communication
In distributed embedded control systems such as solar inverters, motor drives, and battery management slave units, the PIC18LF448-I/PT provides local intelligence plus CAN connectivity. The MCU implements PWM outputs for power-stage control, ADC for current/voltage sensing, and CAN for master-slave communication with the central controller. With 16KB Flash and 768B RAM, it accommodates control loops, protection algorithms, and CAN communication stacks. The 2.0V-5.5V supply range suits 3.3V logic systems, while the industrial -40C to +85C operating range tolerates outdoor solar and traction-motor thermal environments. NanoWatt technology enables deep-sleep modes below 100 nA for energy harvesting applications.
Được đề xuất
Medical & Diagnostic Devices
The PIC18LF448-I/PT supports portable medical and diagnostic equipment such as handheld analyzers, patient monitors, and lab instrumentation requiring networked data logging. The hardware CAN interface connects to bedside monitors and central stations for continuous vital-sign data transmission. With 16KB Flash, the MCU stores communication stacks, calibration constants, and patient-specific profiles. The 10-bit ADC reads sensor signals from pulse oximeters, temperature probes, and ECGs with adequate resolution for clinical diagnostics. Operating from 2.0V to 5.5V, the device supports both line-powered and battery-powered medical devices. NanoWatt sleep modes extend battery life in portable diagnostic equipment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF448-I/PT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC18LF458-I/PT | PIC18LF4480T-I/PT | PIC18LF4458-I/PT | PIC18LF4455T-I/PT | PIC18LF4450T-I/PT | PIC18LF4431T-I/PT |
|---|---|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 16 KB | 32 KB | 16 KB | 16 KB | 24 KB | 32 KB | 8 KB |
| RAM | 768 bytes | 1536 bytes | 768 bytes | 768 bytes | 2048 bytes | 2048 bytes | 768 bytes |
| Maximum CPU Speed | 40 MHz | 40 MHz | 40 MHz | 48 MHz | 48 MHz | 48 MHz | 40 MHz |
| Operating Voltage | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V |
| Integrated Peripheral | CAN 2.0B | CAN 2.0B | CAN 2.0B + enhanced ADC | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG | CAN 2.0B |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
Bảo phân biệt quan trọng
- Low-voltage 2.0V operation for battery-powered designs (vsPIC18F448-I/PT)
- Drop-in memory upgrade to PIC18LF458-I/PT (vsPIC18LF458-I/PT)
- Hardware CAN 2.0B with acceptance filters (vsPIC18LF4458-I/PT)
Ghi chú thiết kế
Place the external crystal (typically 10 MHz or 20 MHz) within 1 cm of pins 13 (OSC1) and 14 (OSC2) to minimize parasitic capacitance and EMI. Use a grounded guard ring around the crystal traces and keep high-speed digital signals (CAN TX/RX, SPI) away from the oscillator area. Decoupling capacitors (100 nF ceramic) should be placed within 3 mm of each VDD pin (11 and 32).
The PIC18LF448-I/PT CAN peripheral requires an external transceiver such as MCP2551 or MCP2561 - the on-chip CAN controller only handles the protocol layer, not physical bus signaling. Do not connect CAN TX/RX pins directly to the bus. Also, configure the CONFIG words for the correct oscillator mode (HS, XT, or internal RC) before programming, as incorrect settings can lock the device.
For CAN bus networks, place 120 ohm termination resistors at both ends of the bus (NOT at every node). Keep CAN bus traces short, matched in length, and routed as a differential pair with 100 ohm characteristic impedance. Avoid routing CAN signals near noisy switching power converters; use ground planes and vias stitching to maintain signal integrity at 1 Mbit/s.
Thông tin tuân thủ
Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified - choose automotive grade variants for automotive safety applications.