PIC18F448-I/PT - 8-bit MCU 16KB Flash 44-TQFP | Microchip
MPN: PIC18F448-I/PT ✓ Hoạt độngPIC18F448-I/PT Tóm tắt
A PIC18 microcontroller is an 8-bit Reduced Instruction Set Computer (RISC) core in the broader category of microcontrollers (MCU), which sit under embedded computing in the semiconductor hierarchy (MCU -> microcontroller -> embedded IC -> semiconductor). The PIC18F family adds enhanced 16-bit instruction words and 8-bit data paths, advanced peripherals, and C-friendly architecture to the legacy PIC16 line, retaining pin-to-pin compatibility with earlier PIC designs while boosting performance up to 10 MIPS at 40 MHz.
Key features include 16 KB Flash with self-programmability, 768 bytes SRAM, 256 bytes EEPROM, 34 digital I/O pins, an enhanced CAN module (ECAN), a 10-bit ADC with up to 8 channels, two 8-bit and three 16-bit timers, two analog comparators, and the nanoWatt power-managed sleep/Idle modes. The CAN peripheral is the primary differentiator versus standard PIC18F452 parts, enabling networked embedded designs.
The PIC18F448 uses a Harvard bus architecture with separate program and data paths, a hardware multiplier (8x8 in one cycle), and an 8-level deep hardware stack supporting interrupt priority. The CAN engine implements CAN 2.0B with acceptance filters, while the 10-bit ADC supports both single-ended and differential conversion modes.
Typical applications include industrial automation (CAN-bus sensor nodes), automotive body controllers, HVAC controls, smart sensors with CAN connectivity, and CAN-to-UART bridges. The 44-TQFP footprint provides 34 I/O pins for user interfaces while maintaining a compact 10x10 mm outline.
When designing with this part, allocate the oscillator configuration and CAN bit-timing registers carefully, since misconfigured CAN timing is a common cause of bus-off errors. In-circuit serial programming (ICSP) via PGC/PGD pins must be reserved for programming and debug, even in production boards.
This page consolidates distributor pricing (DigiKey, Mouser, Heisener, FindMyChip), drop-in alternatives (PIC18F448-E/PT, PIC18F458-I/PT, PIC18F4480-I/PT), and design notes not present in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18F448-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 PIC18F448-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, ADC, Core Architecture, Timers.
PIC18F458-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F448-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4480-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4480T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F442-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4423T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F448-I/PT Tỷ lệ tối đa & tính chất điện
| Core | PIC18 8-bit RISC |
| Program Memory | 16 KB Flash (8K x 16) |
| SRAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Comparators | 2 analog |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Communication | CAN (ECAN), I2C, SPI, UART/USART |
| CAN Module | ECAN 2.0B |
| Nhiệt độ hoạt động | -40C to +85C (Industrial, -I) |
| Hộp | 44-pin TQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
| ICSP Programming | PGC/PGD (2-wire) |
Cấu hình chân PIC18F448-I/PT
| Chân 1 | RC7/RX1/DT1 — Digital I/O / EUSART1 RX / I2C data |
| Chân 2 | RC6/TX1/CK1 — Digital I/O / EUSART1 TX / I2C clock |
| Chân 3 | RC5/SDO — Digital I/O / SPI data out |
| Chân 4 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 5 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 6 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM1 |
| Chân 7 | RC1/CCP2 — Digital I/O / Capture/Compare/PWM2 |
| Chân 8 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator out |
| Chân 9 | OSC1/CLKI — Crystal oscillator input |
| Chân 10 | OSC2/CLKO — Crystal oscillator output |
| Chân 11 | VSS — Ground |
| Chân 12 | RA0/AN0 — Digital I/O / Analog input 0 |
| Chân 13 | RA1/AN1 — Digital I/O / Analog input 1 |
| Chân 14 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / VREF- |
| Chân 15 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / VREF+ |
| Chân 16 | RA4/T0CKI — Digital I/O / Timer0 clock |
| Chân 17 | RA5/AN4/SS — Digital I/O / Analog input 4 / SPI slave select |
| Chân 18 | RE0/RD/AN5 — Digital I/O / Parallel port read / Analog input 5 |
| Chân 19 | RE1/WR/AN6 — Digital I/O / Parallel port write / Analog input 6 |
| Chân 20 | VSS — Ground |
| Chân 21 | RA7 — Digital I/O |
| Chân 22 | RE2/CS/AN7 — Digital I/O / Parallel port chip select / Analog input 7 |
| Chân 23 | VDD — Positive supply (4.2V-5.5V) |
| Chân 24 | RB0/INT0/FLT0 — Digital I/O / External interrupt 0 / PWM fault |
| Chân 25 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Chân 26 | RB2/INT2/CANTX — Digital I/O / External interrupt 2 / CAN TX |
| Chân 27 | RB3/INT3/CANRX — Digital I/O / External interrupt 3 / CAN RX |
| Chân 28 | RB4 — Digital I/O |
| Chân 29 | RB5 — Digital I/O |
| Chân 30 | RB6/PGC — Digital I/O / ICSP clock (programming) |
| Chân 31 | RB7/PGD — Digital I/O / ICSP data (programming) |
| Chân 32 | VDD — Positive supply (4.2V-5.5V) |
| Chân 33 | RD0/PSP0/C1IN+ — Digital I/O / Parallel port / Comparator1 input+ |
| Chân 34 | RD1/PSP1/C1IN- — Digital I/O / Parallel port / Comparator1 input- |
| Chân 35 | RD2/PSP2/C2IN+ — Digital I/O / Parallel port / Comparator2 input+ |
| Chân 36 | RD3/PSP3/C2IN- — Digital I/O / Parallel port / Comparator2 input- |
| Chân 37 | RD4/PSP4/ECCP1 — Digital I/O / Parallel port / Enhanced CCP1 |
| Chân 38 | RD5/PSP5 — Digital I/O / Parallel port |
| Chân 39 | RD6/PSP6 — Digital I/O / Parallel port |
| Chân 40 | RD7/PSP7 — Digital I/O / Parallel port |
| Chân 41 | VSS — Ground |
| Chân 42 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator |
| Chân 43 | RC6/TX1/CK1 — Digital I/O / EUSART1 TX |
| Chân 44 | RC7/RX1/DT1 — Digital I/O / EUSART1 RX |
Ứng dụng tiêu biểu
PIC18F448-I/PT phù hợp cho 6 Áp dụngs: CAN-bus Industrial Sensor Node, Automotive Body Controller, HVAC Climate Control System, CAN-to-UART Bridge / Gateway, Industrial Motor Control Board, Smart Building Sensor Hub.
CAN-bus Industrial Sensor Node
The PIC18F448-I/PT's integrated ECAN 2.0B module makes it ideal for CAN-bus sensor nodes in industrial automation. With 16 KB Flash it fits typical CANopen or DeviceNet protocol stacks, while the 10-bit 8-channel ADC samples multiple sensor inputs. The 40 MHz core delivers 10 MIPS, sufficient for handling CAN interrupts while polling sensors. The 44-TQFP footprint allows compact DIN-rail mounted PCB designs.
Được đề xuất
Automotive Body Controller
The PIC18F448-I/PT supports automotive body-electronics applications such as door modules, mirror controllers, and HVAC nodes. Its ECAN interface connects to the vehicle CAN bus, while 34 I/O pins drive relays, LEDs, and switches. The -40C to +85C industrial temperature range covers cabin environments; for under-hood use, choose the -E variant. The nanoWatt technology minimizes quiescent current during vehicle sleep modes.
Được đề xuất
HVAC Climate Control System
In HVAC climate-control boards, the PIC18F448-I/PT reads temperature/humidity sensors via its 10-bit ADC, drives fan speeds through PWM timers, and reports status over CAN to the central building-management system. The 16 KB Flash fits typical HVAC control firmware with scheduling logic, while 768 bytes SRAM handles short-term buffer storage. The 44-TQFP package is easily hand-solderable for prototype runs.
Được đề xuất
CAN-to-UART Bridge / Gateway
Engineers building protocol bridges between legacy UART equipment and modern CAN networks can deploy the PIC18F448-I/PT as a CAN-to-UART gateway. Its independent UART and ECAN peripherals enable simultaneous CAN message reception and UART forwarding, with the 16 KB Flash sufficient for parsing/repackaging logic. The 8-channel ADC can also report diagnostic voltages to the CAN bus for remote monitoring.
Được đề xuất
Industrial Motor Control Board
The PIC18F448-I/PT is well suited for small BLDC or stepper motor control boards in industrial equipment. The 16-bit timers generate precise PWM for motor commutation, the 8-channel 10-bit ADC reads back current/voltage sensing, and the ECAN interface reports telemetry to the central PLC. The 44-TQFP provides 34 I/O pins for encoder feedback, fault inputs, and status LEDs.
Được đề xuất
Smart Building Sensor Hub
Building-automation sensor hubs using the PIC18F448-I/PT aggregate temperature, occupancy, and air-quality data and publish over CAN bus to the central BMS. The 10-bit ADC handles analog sensors while digital I/O reads occupancy PIR detectors. nanoWatt sleep modes reduce idle power when no motion is detected, and the 16 KB Flash fits BACnet-over-CAN or vendor-specific protocol stacks.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F448-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 | PIC18F458-I/PT | PIC18F448-E/PT | PIC18F4480-I/PT | PIC18F4480T-I/PT |
|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 32 KB | 16 KB | 16 KB | 16 KB |
| SRAM | 768 B | 1.5 KB | 768 B | 768 B | 768 B |
| Operating Voltage | 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 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +125C (Extended) | -40C to +85C | -40C to +85C |
| CAN Module | ECAN 2.0B | ECAN 2.0B | ECAN 2.0B | ECAN 2.0B | ECAN 2.0B |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels |
| MIPS | 10 MIPS at 40 MHz | 10 MIPS at 40 MHz | 10 MIPS at 40 MHz | 10 MIPS at 40 MHz | 10 MIPS at 40 MHz |
Bảo phân biệt quan trọng
- Integrated ECAN 2.0B module on a PIC18 core (vsPIC18F452-I/PT)
- Drop-in memory upgrade path (vsPIC18F458-I/PT)
- Industrial temperature range option (vsPIC18F448-E/PT)
Ghi chú thiết kế
CAN bus timing configuration is the most common source of bus-off errors on PIC18F448 designs. The ECAN module requires the SJW, BRP, PropSeg, PhaseSeg1, and PhaseSeg2 registers to be calculated from the oscillator frequency and target baud rate; an off-by-one in BRP causes intermittent bus failures. Use Microchip's CAN bit-timing calculator tool before freezing the configuration. Always configure the CAN I/O pins (RB2/CANTX, RB3/CANRX) as digital inputs first to avoid spurious CAN frames during startup.
Both VDD pins (23 and 32) and all three VSS pins (11, 20, 41) must be connected, even if the corresponding I/O ports are unused. Decoupling requires a 100 nF ceramic capacitor on each VDD pin placed within 5 mm of the package, plus a bulk 10 uF tantalum or aluminum cap on the 5V rail. Brown-out reset (BOR) must be enabled in CONFIG2H to prevent Flash corruption during supply droops below 4.2 V.
Reserve the RB6/PGC and RB7/PGD pins for ICSP programming even in production designs. Adding a 2x5 0.1 inch header (or castellated test pads) allows field firmware updates without removing the chip. The 44-TQFP footprint benefits from a copper keep-out zone under the package and a continuous ground plane on the top layer for thermal dissipation; the device dissipates roughly 250 mW at 40 MHz with all peripherals active.
Estimated: with FOSC at 40 MHz, the PIC18F448 transitions an I/O pin in roughly 10 ns. Place series resistors (33-47 ohm) on high-speed signals like SCK, SDO, and CANTX if the trace length exceeds 25 mm or crosses multiple ground-plane splits. Keep ADC traces (AN0-AN7) short and away from the oscillator pins; ADC accuracy degrades 1-2 LSBs if analog traces run parallel to digital clock traces for more than 20 mm.
Thông tin tuân thủ
RoHS compliant per Microchip product page and DigiKey listing. Not AEC-Q100 qualified; for automotive applications requiring formal qualification, evaluate PIC18F458-I/PT automotive variants or higher-grade MCUs. Conflict-minerals compliance per Microchip corporate statement.