PIC18F2431T-I/ML - 8-Bit 40MHz MCU, 16KB Flash, 28-QFN | Microchip
MPN: PIC18F2431T-I/ML ✓ فعالPIC18F2431T-I/ML نمای کلی
An 8-bit PIC microcontroller is a Harvard-architecture RISC processor widely used in embedded control applications. Within the broader taxonomy, PIC18 sits above base-line PIC10/12/16 and below the 16-bit dsPIC and 32-bit PIC32 families, forming the high-end tier of Microchip's 8-bit portfolio. These devices balance deterministic real-time response with low power consumption through Microchip's nanoWatt technology, making them a common choice for cost-sensitive applications requiring on-chip peripherals like PWM, ADC, and communication interfaces.
Key features of the PIC18F2431 include 25 general-purpose I/O pins, four timer modules, a 10-bit A/D converter with up to 9 input channels, an enhanced USART, an SPI/I2C-compatible master synchronous serial port, and a high-performance 14-bit PWM with complementary outputs and dead-band control. The 40 MHz internal oscillator supports instruction cycle times as low as 100 ns, while nanoWatt power management provides multiple idle and sleep modes that reduce quiescent current to the microampere range, extending battery life in portable designs.
The device integrates Microchip's Power Control PWM (PCPWM) module with three complementary output pairs, fault inputs, and a 14-bit duty-cycle resolution. This dedicated peripheral eliminates the need for external motor-control logic and is one of the differentiators that positions the PIC18F2431 for driving 3-phase brushless DC (BLDC) motors, switched reluctance motors, and uninterruptible power supplies where tight PWM timing is required.
Typical applications include 3-phase BLDC motor control, sensorless fan and pump drives, digital switching power supplies, UPS systems, and industrial automation loops. The combination of 16 KB self-programmable Flash, on-chip EEPROM for parameter storage, and 25 I/O pins supports closed-loop control of small motors in white goods, ceiling fans, and small appliances.
When designing with this device, ensure the QFN-28 thermal pad is properly soldered to a sufficiently large copper pour to keep junction temperature within the industrial range under full CPU and PWM load. The internal oscillator accuracy of +/-2% is adequate for UART communication at standard baud rates; for higher-precision timing, an external crystal should be added on OSC1/OSC2.
This page synthesizes distributor pricing, drop-in alternative candidates, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference for sourcing and validating the PIC18F2431T-I/ML.
جایگزین‌های drop-in برای PIC18F2431T-I/ML — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC18F2431T-I/ML (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Supply Voltage, Operating Temperature, ADC, Core Architecture.
PIC18F2431-I/ML
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F2331T-I/MM
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F4431T-I/ML
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F2423T-I/ML
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
DSPIC33FJ12MC202-I/ML
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F2431T-I/ML حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | 8-bit PIC18 enhanced RISC |
| حداکثر فرکانس کلاک | 40 MHz |
| Program Memory (Flash) | 16 KB (8K x 16) |
| SRAM | 768 bytes |
| EEPROM | 256 bytes |
| ولتاژ تغذیه | 4.2 V to 5.5 V |
| I/O Pins | 25 |
| A/D Converter | 10-bit, up to 9 channels |
| PWM Module | Power Control PWM, 14-bit resolution, 3 complementary pairs |
| Communication Interfaces | Enhanced USART, SPI, I2C (MSSP) |
| Timers | 4 (Timer0-Timer3) |
| بسته‌بندی | 28-QFN (6x6 mm) ML |
| دمای کاری | -40C to +85C (Industrial) |
| نوع نصب | Surface Mount |
| وضعیت RoHS | Compliant |
| IC Type | Microcontroller (MCU) |
| Power Technology | nanoWatt |
پیکربندی پین PIC18F2431T-I/ML
| پین 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| پین 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| پین 3 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC negative reference |
| پین 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| پین 5 | RA4/AN4/T0CKI — Digital I/O / Analog input 4 / Timer0 clock input |
| پین 6 | RA5/AN5/SS/LVDIN — Digital I/O / Analog input 5 / SPI slave select / LVD input |
| پین 7 | OSC1/CLKI/RA7 — Oscillator input / external clock / GPIO |
| پین 8 | OSC2/CLKO/RA6 — Oscillator output / clock output / GPIO |
| پین 9 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock |
| پین 10 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 output |
| پین 11 | RC2/CCP1/P1A — Digital I/O / CCP1 output / PWM1 output A |
| پین 12 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| پین 13 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| پین 14 | RC5/SDO — Digital I/O / SPI data out |
| پین 15 | RC6/TX/CK — Digital I/O / USART transmit / USART clock |
| پین 16 | RC7/RX/DT — Digital I/O / USART receive / USART data |
| پین 17 | VSS — Ground reference |
| پین 18 | VDD — Positive supply (4.2 V to 5.5 V) |
| پین 19 | RB0/INT0/FLTA — Digital I/O / external interrupt 0 / PWM fault A |
| پین 20 | RB1/INT1 — Digital I/O / external interrupt 1 |
| پین 21 | RB2/INT2 — Digital I/O / external interrupt 2 |
| پین 22 | RB3/INT3/ECCPX/P2A — Digital I/O / external interrupt 3 / ECCP / PWM2 output A |
| پین 23 | RB4/P2B — Digital I/O / PWM2 output B |
| پین 24 | RB5/P3A — Digital I/O / PWM3 output A |
| پین 25 | RB6/PGC — Digital I/O / ICSP clock |
| پین 26 | RB7/PGD — Digital I/O / ICSP data |
| پین 27 | MCLR/VPP — Master clear reset / ICSP programming voltage |
| پین 28 | NC — Not connected (per datasheet) |
کاربردهای معمول
PIC18F2431T-I/ML مناسب است برای 6 کاربردs: 3-Phase BLDC Motor Control, Sensorless Ceiling Fan and Pump Drives, Uninterruptible Power Supply (UPS) Control, Digital Switching Power Supplies, Industrial Sensor Conditioning, White Goods and Small Appliance Control.
3-Phase BLDC Motor Control
The PIC18F2431T-I/ML is purpose-built for 3-phase brushless DC motor control, integrating a 14-bit Power Control PWM with three complementary output pairs, programmable dead-band, and dedicated fault inputs in a single 28-QFN IC. At 40 MHz the enhanced PIC18 core runs closed-loop FOC or trapezoidal commutation algorithms while the hardware PWM handles switching, freeing the CPU for current sensing and speed regulation. The 10-bit ADC with up to 9 channels samples back-EMF or current shunt signals in synchronism with the PWM reload, enabling sensor or sensorless operation. Compared with discrete MCU-plus-driver designs, integrating the PCPWM peripheral reduces board area and improves timing determinism on the same PCB footprint.
پیشنهادی
Sensorless Ceiling Fan and Pump Drives
The PIC18F2431T-I/ML drives sensorless BLDC ceiling fans and small pumps by combining the 14-bit Power Control PWM, 10-bit ADC, and 40 MIPS CPU in a compact 28-QFN package. The PCPWM generates complementary switching waveforms with dead-band insertion while the ADC samples back-EMF zero-crossings to estimate rotor position, eliminating Hall sensors and reducing BOM cost. NanoWatt power management drops the device into microamp-level sleep between speed changes, supporting energy-star standby targets. The 16 KB Flash fits complete sensorless startup, commutation, and protection firmware without external memory, all on the same 6x6 mm PCB footprint.
پیشنهادی
Uninterruptible Power Supply (UPS) Control
The PIC18F2431T-I/ML serves as the digital control core in small UPS and inverter systems, where its 14-bit Power Control PWM synthesizes sinusoidal output waveforms at 50/60 Hz with fine duty-cycle resolution. At 40 MHz, the CPU computes PID loops for output voltage regulation, monitors battery state, and drives the front-panel interface. The 256-byte EEPROM stores calibration constants and battery profiles across power cycles. Its 4.2-5.5 V supply matches a regulated 5 V rail from the auxiliary converter, and the 25 I/O lines accommodate multiple feedback paths, relays, and alarm outputs in the same 28-QFN package.
پیشنهادی
Digital Switching Power Supplies
The PIC18F2431T-I/ML implements digital control of DC-DC converters and PFC stages by using the Power Control PWM as the switching element controller and the 10-bit ADC to digitize output voltage and current. The 40 MIPS PIC18 core runs discrete control loops at 100-200 kHz switching frequencies, replacing traditional analog UC3842-style controllers with a programmable solution. The 16 KB Flash stores multiple firmware profiles for different output voltages, and the 256-byte EEPROM stores trim and calibration values. Its 28-QFN package with exposed thermal pad dissipates the small CPU and I/O heat on the same PCB as the power stage.
پیشنهادی
Industrial Sensor Conditioning
The PIC18F2431T-I/ML is well suited to industrial sensor-conditioning and process-control loops, where its 10-bit ADC with up to 9 channels digitizes thermocouples, RTDs, strain gauges, and 4-20 mA loops. The 40 MHz core runs linearization, averaging, and digital filtering algorithms in real time, while the enhanced USART or SPI interfaces push data to a host PLC. The 256-byte EEPROM stores sensor calibration constants that survive power cycles, critical for field-replaceable modules. Its industrial -40C to +85C temperature range and 28-QFN package fit the same footprint as standard instrumentation front ends.
پیشنهادی
White Goods and Small Appliance Control
The PIC18F2431T-I/ML powers the electronic control of washing machines, dishwashers, refrigerators, and other white goods, replacing electromechanical timers with programmable digital logic. The 14-bit Power Control PWM drives compressor or drum motors, the 10-bit ADC reads temperature and water level sensors, and the enhanced USART interfaces with the front-panel UI. The 16 KB Flash accommodates feature-rich firmware including fault diagnostics, while 256-byte EEPROM retains user settings across power cycles. Its -40C to +85C industrial temperature range and 28-QFN package are designed for the harsh thermal and vibration environment of appliance interiors.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18F2431T-I/ML — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18F2431-I/ML | PIC18F2331T-I/MM | PIC18F4431T-I/ML | PIC18F2423T-I/ML | DSPIC33FJ12MC202-I/ML |
|---|---|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) ML | 28-QFN (6x6 mm) ML - same | 28-QFN (MM) - same | 28-QFN (ML) - same | 28-QFN (ML) - same | 28-QFN (ML) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Core | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 | 16-bit dsPIC33 (DSP) |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz (10 MIPS dsPIC33 core) |
| Flash Memory | 16 KB | 16 KB | 8 KB | 16 KB | 16 KB | 12 KB |
| SRAM | 768 B | 768 B | 768 B | 768 B | 768 B | 1 KB |
| PWM | 14-bit PCPWM, 3 complementary pairs | 14-bit PCPWM | 14-bit PCPWM | 14-bit PCPWM (more channels) | 10-bit standard CCP PWM (no PCPWM) | 16-bit Motor Control PWM, 6 channels |
| Supply Voltage | 4.2 V to 5.5 V | 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 | 3.0 V to 3.6 V |
تفاوت‌های کلیدی
- Integrated 14-bit Power Control PWM for motor control (در مقابلPIC18F2423T-I/ML)
- 16 KB Flash for feature-rich motor-control firmware (در مقابلPIC18F2331T-I/MM)
- Industrial-grade 5V operation with wide MCU ecosystem (در مقابلDSPIC33FJ12MC202-I/ML)
یادداشت‌های طراحی
Estimated: the PIC18F2431T-I/ML in 28-QFN has a typical theta_JA of approximately 35-40 C/W on a 1-oz, 4-layer JEDEC test board, with the exposed thermal pad soldered to a top-layer copper pour of at least 100 mm^2. At full 40 MHz CPU load with all peripherals active, IDD is typically 16-25 mA, so worst-case power dissipation is approximately 5.5 V x 25 mA = 138 mW, yielding a junction temperature rise of about 5-6 C above ambient. A continuous copper pour tied to GND on the top layer is recommended for the best thermal path.
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pin 18), plus a single 10 uF bulk tantalum or ceramic on the VDD rail. The exposed thermal pad on pin 29 (package underside) must be soldered to a top-layer copper pour with multiple thermal vias to the internal ground plane for heat spreading. Keep analog inputs (RA0-RA5) and the VREF+/VREF- pins routed away from PWM switching traces to avoid digital switching noise coupling into ADC samples.
Do not apply signals to RA4 (open-drain output) without a pull-up resistor - it requires an external pull-up for high-level output. When using the ICD 3 or PICkit 5 for in-circuit programming, ensure the MCLR/VPP line is not held low by external circuitry, and add a 10 kohm pull-up to MCLR to avoid spurious resets. The 14-bit Power Control PWM uses PWM1, PWM2, PWM3 outputs (P1A/P1B/P1C, P2A/P2B/P2C, P3A/P3B/P3C) and the FLTA pin - verify these pin assignments match your schematic before PCB layout.
Estimated: route the oscillator traces (OSC1/OSC2) as short as possible and surround them with a ground guard ring to minimize EMI pickup. If an external crystal is used, place the load capacitors within 3-5 mm of the OSC pins and use a low-ESR ceramic rated for the specific load capacitance. For motor-control designs, separate the analog ground (AGND, tied to VSS) from the power ground (PGND, tied to the gate driver returns) at a single point near the QFN thermal pad to avoid high-current switching transients in the analog reference.
اطلاعات انطباق
RoHS compliant per Microchip product page. Industrial -40C to +85C temperature grade; not AEC-Q100 automotive qualified - for automotive use choose PIC18F2431-I/ML with extended temperature range or contact Microchip for Q-grade variants. Halogen-free per Microchip environmental certification.
