PIC18LF4431-I/P - 8-bit PIC18 40MHz 16KB Flash MCU | Microchip
MPN: PIC18LF4431-I/P ✓ Hoạt độngPIC18LF4431-I/P Tóm tắt
An 8-bit microcontroller (MCU) is a programmable integrated circuit that uses an 8-bit data path, executes instructions from on-chip Flash memory, and integrates CPU, RAM, non-volatile storage, and peripherals (ADC, PWM, timers, communication) into a single chip. The PIC18LF family sits above PIC16 in Microchip's 8-bit hierarchy and is widely used where deterministic interrupt response, low power, and proven toolchains matter more than raw compute. The 'LF' suffix designates the wide-voltage variant that operates across 2.0V-5.5V, while the 'F' (non-LF) version targets 4.2V-5.5V only.
Key features include 16KB (8K x 16) Flash program memory, 768 bytes of data RAM, a 10-bit ADC with multiple channels, an enhanced CCP (Capture/Compare/PWM) module with up to 14-bit resolution for motor control, and nanoWatt Technology power management offering Sleep, Idle, and Run modes. The 40-pin PDIP package is the most legacy-friendly footprint in the PIC18 line and is preferred for prototyping, hobbyist designs, and educational platforms.
The PIC18LF4431-I/P uses Microchip's enhanced Harvard RISC architecture with 16-bit instructions, 8-bit data, and a hardware multiplier, executing up to 10 MIPS at 40 MHz. Code is fetched from Flash through a 16-bit program bus while data moves on an 8-bit bus, which together enable single-cycle instruction execution and predictable timing for interrupt-driven firmware.
Typical applications include three-phase induction motor control (BLDC, PMSM), HVAC fan and pump control, industrial automation, SMPS digital control loops, automotive body electronics (via the automotive-grade PIC18F4431-I/P sibling), and educational/development boards. The integrated high-resolution PWM and ADC are tuned specifically for closed-loop motor control firmware.
When designing with this MCU, remember that 'LF' denotes the wide-voltage variant - do not swap it for the non-LF PIC18F4431 in 3.3V-only designs. Programming is done via ICSP through PGC/PGD pins, and MPLAB X IDE plus MPLAB XC8 are the supported toolchains. ESD-sensitive pins (especially analog inputs) require series resistors and clamping.
This page synthesizes distributor pricing, drop-in alternative MPNs from the same PIC18 family, and practical design notes not consolidated in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4431-I/P — 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 PIC18LF4431-I/P (cùng hình factor và footprint) — khác nhau ở Package, Mounting Type, I/O Pins, Core, Power-Saving Modes.
PIC18F4431-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4331-I/P
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4331-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4539-I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F4539-I/P
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF442-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4431-I/P Tỷ lệ tối đa & tính chất điện
| Core | PIC18 (8-bit RISC, 16-bit instructions) |
| Program Memory | 16 KB (8K x 16) Flash |
| Data RAM | 768 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| Supply Voltage Range | 2.0 V to 5.5 V (LF wide-voltage variant) |
| I/O Pins | 34 |
| ADC | 10-bit, multi-channel |
| PWM | Enhanced CCP, up to 14-bit resolution (motor-control optimized) |
| Communication | UART, SPI, I2C |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 40-pin PDIP (DIP-40) |
| Kiểu lắp đặt | Through-Hole (THT) |
| Cấp MSL | Not applicable (THT) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
| ICSP Programming | Yes (PGC/PGD) |
| Power-Saving Modes | nanoWatt Technology: Run / Idle / Sleep |
Cấu hình chân PIC18LF4431-I/P
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) / ICSP programming voltage / digital I/O RE3 |
| Chân 2 | RA0/AN0 — Digital I/O RA0 / analog input AN0 |
| Chân 3 | RA1/AN1 — Digital I/O RA1 / analog input AN1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O RA2 / analog input AN2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O RA3 / analog input AN3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI — Digital I/O RA4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O RA5 / analog input AN4 / SPI slave select |
| Chân 8 | RE0/RD — Digital I/O RE0 |
| Chân 9 | RE1/WR — Digital I/O RE1 |
| Chân 10 | RE2/CS — Digital I/O RE2 |
| Chân 11 | VDD — Positive supply voltage (2.0-5.5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock / digital I/O RA7 |
| Chân 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / digital I/O RA6 |
| Chân 15 | RC0/T1OSO/T13CKI — Digital I/O RC0 / Timer1 oscillator output |
| Chân 16 | RC1/T1OSI/CCP2 — Digital I/O RC1 / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — Digital I/O RC2 / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — Digital I/O RC3 / SPI SCK / I2C SCL |
| Chân 19 | RD0/PSP0 — Digital I/O RD0 / parallel slave port bit 0 |
| Chân 20 | RD1/PSP1 — Digital I/O RD1 / parallel slave port bit 1 |
| Chân 21 | RD2/PSP2 — Digital I/O RD2 / parallel slave port bit 2 |
| Chân 22 | RD3/PSP3 — Digital I/O RD3 / parallel slave port bit 3 |
| Chân 23 | RC4/SDI/SDA — Digital I/O RC4 / SPI SDI / I2C SDA |
| Chân 24 | RC5/SDO — Digital I/O RC5 / SPI SDO |
| Chân 25 | RC6/TX/CK — Digital I/O RC6 / UART TX / UART clock |
| Chân 26 | RC7/RX/DT — Digital I/O RC7 / UART RX / UART data |
| Chân 27 | RD4/PSP4 — Digital I/O RD4 / parallel slave port bit 4 |
| Chân 28 | RD5/PSP5 — Digital I/O RD5 / parallel slave port bit 5 |
| Chân 29 | RD6/PSP6/TX2 — Digital I/O RD6 / parallel slave port bit 6 / AUSART2 TX |
| Chân 30 | RD7/PSP7/RX2 — Digital I/O RD7 / parallel slave port bit 7 / AUSART2 RX |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage (2.0-5.5 V) |
| Chân 33 | RB0/INT0 — Digital I/O RB0 / external interrupt 0 |
| Chân 34 | RB1/INT1 — Digital I/O RB1 / external interrupt 1 |
| Chân 35 | RB2/INT2 — Digital I/O RB2 / external interrupt 2 |
| Chân 36 | RB3/INT3/CCP2 — Digital I/O RB3 / external interrupt 3 / CCP2 |
| Chân 37 | RB4/KBI0 — Digital I/O RB4 / interrupt-on-change bit 0 |
| Chân 38 | RB5/KBI1/PGM — Digital I/O RB5 / interrupt-on-change bit 1 / LVP programming |
| Chân 39 | RB6/KBI2/PGC — Digital I/O RB6 / interrupt-on-change bit 2 / ICSP clock |
| Chân 40 | RB7/KBI3/PGD — Digital I/O RB7 / interrupt-on-change bit 3 / ICSP data |
Ứng dụng tiêu biểu
PIC18LF4431-I/P phù hợp cho 6 Áp dụngs: 3-Phase BLDC / PMSM Motor Control, Industrial HVAC Fan / Pump Control, Switch-Mode Power Supply (SMPS) Digital Control, Educational Microcontroller Boards, Industrial Sensor Hub / Data Logger, Automotive Body Electronics (via PIC18F4431-I/P sibling).
3-Phase BLDC / PMSM Motor Control
The PIC18LF4431-I/P is purpose-built for three-phase motor control thanks to its enhanced Power Control PWM module with up to 14-bit resolution, programmable dead-band, and dedicated fault inputs. Operating from 2.0-5.5 V lets it interface directly to 3.3 V gate drivers and 5 V analog feedback networks without level shifters. The 40 MIPS throughput and 10-bit ADC combined with on-chip comparators close a single-cycle ADC-PWM loop, delivering smooth torque at low RPM and predictable commutation in BLDC and PMSM drives. Placed as the main MCU on the inverter control board, it reads phase currents, computes space-vector modulation, and updates the three-phase duty cycle within microseconds, eliminating the need for an external DSP.
Được đề xuất
Industrial HVAC Fan / Pump Control
The PIC18LF4431-I/P fits HVAC variable-speed drives where deterministic PWM, an industrial temperature grade, and reliable 8-bit firmware matter more than raw CPU speed. Its nanoWatt Technology Sleep / Idle / Run modes drop the MCU quiescent current into the microamp range when the fan or pump idles, supporting Energy Star compliance. The 40-pin PDIP through-hole package is preferred for HVAC control boards because it tolerates thermal cycling and field service better than fine-pitch SMD. Connected to a 24 VAC rectified rail, the LF variant's 2.0 V start-up enables cold-boot operation from partially discharged bulk capacitors.
Được đề xuất
Switch-Mode Power Supply (SMPS) Digital Control
The PIC18LF4431-I/P is well suited to digital control of switch-mode power supplies, where its 40 MIPS core executes voltage-mode and average-current-mode control loops in firmware. The high-resolution PWM and ADC sample the output voltage and inductor current synchronously, while the 2.0-5.5 V supply lets the MCU share the auxiliary bias rail without an extra LDO. Implementing peak current-mode control or PFC in software removes the analog UC3842-style controller, reducing BOM count and enabling firmware-updatable compensation. With 34 I/O pins, the part also drives sync-rectifier FETs, fault indicators, and a PMBus-style telemetry interface from a single chip.
Được đề xuất
Educational Microcontroller Boards
The PIC18LF4431-I/P is widely adopted on university microcontroller courses and hobbyist dev boards thanks to its DIP-40 through-hole footprint, easy breadboarding, and forgiving 2.0-5.5 V supply. Students can program it via the ICSP pins using a PICkit 5 or PICkit 4 without a bootloader, and the 34 I/O pins leave enough headroom for keypad, LCD, and motor-control experiments. The PIC18 instruction set is well-documented and the MPLAB XC8 toolchain is free, making the part an entry point into embedded firmware development. Because the LF variant survives 3.3 V and 5 V lab rails, course kits can mix Arduino-style and 5 V legacy peripherals on the same board.
Được đề xuất
Industrial Sensor Hub / Data Logger
The PIC18LF4431-I/P handles distributed industrial sensor hubs that aggregate 4-20 mA loops, thermistors, and digital inputs in a single MCU. Its 10-bit ADC with multiple channels reads up to a dozen analog sensors, while the UART / SPI / I2C peripherals push the data to a host PLC or gateway. The 16 KB Flash holds a small RTOS or a custom scheduler, and nanoWatt modes stretch battery life on remote nodes. Wide-voltage operation tolerates long cable runs where the supply voltage drops under load, making this part a robust choice for factory-floor telemetry.
Được đề xuất
Automotive Body Electronics (via PIC18F4431-I/P sibling)
While the PIC18LF4431-I/P itself targets industrial, the automotive-qualified PIC18F4431-I/P variant shares the same die and pinout for body-electronics modules such as seat controllers, mirror adjusters, and HVAC blend doors. The 40-pin PDIP package supports hand-reworkable automotive aftermarket ECUs and pre-production prototypes. Engineers prototyping on the LF industrial part can migrate firmware to the AEC-Q100 automotive variant without changing the board. The motor-control PWM is ideal for driving small brushed DC actuators used in mirrors, doors, and HVAC dampers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4431-I/P — 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 | PIC18F4431-I/P | PIC18LF4331-I/P | PIC18F4331-I/P | PIC18LF4539-I/P | PIC18F4539-I/P | PIC18LF442-I/P |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-40 (DIP-40) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) |
| Core / Architecture | PIC18 8-bit, 16-bit instructions | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit |
| Flash Program Memory | 16 KB | 16 KB | 8 KB | 8 KB | 32 KB | 32 KB | 16 KB |
| Data RAM | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 1408 bytes | 1408 bytes | 768 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage Range | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
| Motor-Control PWM | Yes (14-bit, fault inputs) | Yes (14-bit) | Yes (14-bit) | Yes (14-bit) | Yes (14-bit) | Yes (14-bit) | Standard CCP (no motor-control PWM) |
| Automotive Grade | No (Industrial) | AEC-Q100 (automotive) | No | AEC-Q100 (automotive) | No | AEC-Q100 (automotive) | No |
Bảo phân biệt quan trọng
- Wide-voltage 2.0 V to 5.5 V operation (vsPIC18F4431-I/P)
- Larger Flash than the 4331 sibling (vsPIC18LF4331-I/P)
- Dedicated motor-control PWM module (vsPIC18LF442-I/P)
- Industrial temperature grade and nanoWatt modes (vsPIC18F4539-I/P)
Ghi chú thiết kế
The PIC18LF4431-I/P accepts 2.0 V to 5.5 V on VDD, but brown-out reset (BOR) thresholds and ADC VREF behavior vary across the range. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pin pair (the 40-pin PDIP exposes pins 11/12 and 31/32), and add a 10 uF bulk capacitor on the VDD rail to suppress motor-current dips. Estimated: at 40 MHz with all peripherals active, IDD reaches ~25 mA; nanoWatt Sleep drops this into the microamp range for battery-backed designs.
Keep analog inputs (AN0-AN4) routed away from PWM outputs and the crystal traces to minimize coupling into ADC samples. Place the ICSP connector (PGC/PGD/MCLR/VPP) on the board edge with a 4.7 kohm pull-up on MCLR so the PICkit can attach without removing the MCU. For motor-control boards, use a ground star point under the IC with separate analog and power grounds, joined only at the MCU GND pin. Keep crystal traces short and symmetric; ground the oscillator body with a guard ring.
Do not assume the PIC18LF4431-I/P and PIC18F4431-I/P are interchangeable across voltage rails - the F variant only operates from 4.2 V to 5.5 V and will not start up at 3.3 V. Always configure the Configuration bits for the oscillator mode (HS for >4 MHz crystal) before locking the code. When using the enhanced PWM module, enable the proper PWM fault input mapping or the bridge can lock on at full duty. Finally, set unused I/O pins to outputs (low) to minimize Sleep current.
Thông tin tuân thủ
RoHS compliant per Microchip product page and DigiKey listing. The PIC18LF4431-I/P is the industrial variant; choose PIC18F4431-I/P for AEC-Q100 automotive qualification. Lead-free matte-tin finish. Conflict-minerals declaration available from Microchip on request.
