PIC18LF4331-I/PT - 8KB Flash 8-bit MCU w/ Motor PWM | Microchip
N.º de pieza: PIC18LF4331-I/PT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.87 | $9,87 |
| 10 | $8.92 | $89,20 |
| 100 | $7.85 | $785,00 |
| 500 | $6.74 | $3.370,00 |
| 1.000 | $5.92 | $5.920,00 |
PIC18LF4331-I/PT Descripción general
What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of 8-bit, 16-bit, and 32-bit microcontrollers built on a Harvard-architecture RISC core originally developed by General Instrument's Microelectronics Division and now produced by Microchip Technology. PIC18F devices sit in the high-performance tier of the 8-bit PIC family, combining enhanced instruction set (16-bit wide opcodes), multiple peripherals (motor-control PWM, USB, CAN, ADC), and nanoWatt power-management modes. They are commonly used in motor control, sensor interfacing, and small embedded control loops where low cost and mature toolchains (MPLAB X IDE, XC8 compiler, MPLAB ICD programmers) are priorities.
Key features of the PIC18LF4331 include an integrated Power Control PWM (PCPWM) module with three complementary PWM outputs, dead-band control and programmable fault inputs specifically designed for 3-phase motor drives. The 10-bit ADC with up to 200 Ksps throughput supports current sensing, while the Capture/Compare/PWM (CCP) and Enhanced CCP modules add flexible waveform generation. The device also incorporates the nanoWatt technology power-saving modes (Idle, Sleep, and Run), an on-chip 32 kHz oscillator for low-power timing, and an ICD (In-Circuit Debug) interface for non-intrusive development.
Typical applications for the PIC18LF4331 include BLDC and PMSM motor controllers, ceiling fan and pump controllers, HVAC blower drivers, small appliance motor control, sensor signal conditioning front-ends, and industrial control boards where 8-bit cost targets and 5V-tolerant I/O are essential. The wide operating voltage (2.0V to 5.5V) also suits 2-cell battery packs and unregulated supply rails.
When designing with this MCU, allocate decoupling capacitors (100 nF + 10 uF) close to VDD/AVDD/VSS pins and place the 20 MHz or 40 MHz crystal (with appropriate load capacitors) within 10 mm of OSC1/OSC2 to minimize EMI. Use the integrated PCPWM module's programmable dead-band and fault shutdown rather than discrete gate-driver logic to reduce BOM cost.
Alternativas directas para PIC18LF4331-I/PT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC18LF4331-I/PT (mismo factor de forma y huella) — difiere en Package, Operating Temperature, Core Architecture, Timers, Communication.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC18LF4331-I/PT
✅ Sustitución directa✓ En stock
$5.92 / unidad
Ver hoja de datos →PIC18F4331-I/PT
✅ Sustitución directa✓ En stock
$3.05 / unidad
Ver hoja de datos →PIC18LF4431-I/PT
✅ Sustitución directa✓ En stock
$5.45 / unidad
Ver hoja de datos →PIC18F4431-I/PT
✅ Sustitución directa✓ En stock
$4.79 / unidad
Ver hoja de datos →PIC18LF4321-I/ML
✅ Sustitución directa✓ En stock
$4.43 / unidad
Ver hoja de datos →PIC18LF4331-I/PT Valores máximos y características eléctricas
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Program Memory (Flash) | 8 KB (4K x 16 instructions) |
| Data Memory (SRAM) | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 9 channels |
| Timers | Three 16-bit timers |
| PWM Outputs (PCPWM module) | 3 complementary pairs with dead-band and fault input |
| Analog Comparators | 2 |
| Communication Peripherals | AUSART, MSSP (SPI/I2C) |
| Temperatura de funcionamiento | -40 C to +85 C (Industrial grade) |
| Encapsulado | 44-pin TQFP (10x10 mm) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Debug Interface | ICD (In-Circuit Debug) |
Configuración de pines de PIC18LF4331-I/PT
| Pin 1 | RC0/T1OSO/T1CKI — I/O port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 2 | RC1/T1OSI/CCP2 — I/O port C bit 1 / Timer1 oscillator input / CCP2 capture/compare/PWM |
| Pin 3 | RC2/CCP1 — I/O port C bit 2 / Enhanced CCP1 PWM output |
| Pin 4 | RC3/SCK/SCL — I/O port C bit 3 / SPI clock / I2C clock (MSSP) |
| Pin 5 | RC4/SDI/SDA — I/O port C bit 4 / SPI data in / I2C data (MSSP) |
| Pin 6 | RC5/SDO — I/O port C bit 5 / SPI data out (MSSP) |
| Pin 7 | RC6/TX/CK — I/O port C bit 6 / AUSART transmit / AUSART clock |
| Pin 8 | RC7/RX/DT — I/O port C bit 7 / AUSART receive / AUSART data |
| Pin 9 | OSC2/RA6 — Oscillator output / I/O port A bit 6 |
| Pin 10 | OSC1/RA7 — Oscillator input / I/O port A bit 7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | PWM0 — PWM output 0 (PCPWM module) |
| Pin 14 | PWM1 — PWM output 1 (PCPWM module) |
| Pin 15 | PWM2 — PWM output 2 (PCPWM module) |
| Pin 16 | PWM3 — PWM output 3 (PCPWM module) |
| Pin 17 | PWM4 — PWM output 4 (PCPWM module) |
| Pin 18 | PWM5 — PWM output 5 (PCPWM module) |
| Pin 19 | FLTA — PWM fault input A (active-low shutdown) |
| Pin 20 | NC — Not connected (per datasheet 39616D) |
| Pin 21 | RA0/AN0 — I/O port A bit 0 / analog input channel 0 |
| Pin 22 | RA1/AN1 — I/O port A bit 1 / analog input channel 1 |
| Pin 23 | RA2/AN2/VREF- — I/O port A bit 2 / analog input channel 2 / ADC VREF- |
| Pin 24 | RA3/AN3/VREF+ — I/O port A bit 3 / analog input channel 3 / ADC VREF+ |
| Pin 25 | RA4/AN4 — I/O port A bit 4 / analog input channel 4 |
| Pin 26 | RA5/AN5 — I/O port A bit 5 / analog input channel 5 |
| Pin 27 | AVSS — Analog ground reference |
| Pin 28 | AVDD — Analog positive supply voltage |
| Pin 29 | RB0/INT0 — I/O port B bit 0 / external interrupt 0 |
| Pin 30 | RB1/INT1 — I/O port B bit 1 / external interrupt 1 |
| Pin 31 | RB2/INT2 — I/O port B bit 2 / external interrupt 2 |
| Pin 32 | RB3/INT3 — I/O port B bit 3 / external interrupt 3 |
| Pin 33 | RB4 — I/O port B bit 4 |
| Pin 34 | RB5 — I/O port B bit 5 |
| Pin 35 | RB6/PGC — I/O port B bit 6 / ICD clock (programming/debug) |
| Pin 36 | RB7/PGD — I/O port B bit 7 / ICD data (programming/debug) |
| Pin 37 | MCLR/VPP — Master clear reset input / programming voltage |
| Pin 38 | RD0 — I/O port D bit 0 |
| Pin 39 | RD1 — I/O port D bit 1 |
| Pin 40 | RD2 — I/O port D bit 2 |
| Pin 41 | RD3 — I/O port D bit 3 |
| Pin 42 | RC0/T1OSO/T1CKI — [DATA_NEEDED: pin function overlap with pin 1] |
| Pin 43 | RD5 — [DATA_NEEDED: confirm function] |
| Pin 44 | RE0 — [DATA_NEEDED: confirm function] |
Aplicaciones típicas
PIC18LF4331-I/PT es adecuado para 7 aplicacións: BLDC / PMSM Motor Control, Ceiling Fan and Pump Speed Controller, HVAC Blower Driver, Small Appliance Motor Control, Sensor Signal Conditioning Front-End, Industrial Control Board (5V Systems), Battery-Powered Sensor Hub.
BLDC / PMSM Motor Control
The PIC18LF4331-I/PT is purpose-built for 3-phase brushless DC (BLDC) and permanent magnet synchronous motor (PMSM) control via its integrated Power Control PWM (PCPWM) module. The PCPWM provides three complementary PWM output pairs with programmable dead-band delay (preventing shoot-through in half-bridge drivers) and a hardware fault input that can instantly shut down all PWM outputs on overcurrent events from a comparator. The 10-bit ADC samples phase currents at up to 200 Ksps through dedicated sensing channels, while the 40 MHz / 10 MIPS core executes sensorless back-EMF or FOC control loops in real time. The 2.0V-5.5V supply range suits battery-powered motor tools (18V drill packs regulated to 3.3V for the MCU), while the 44-pin TQFP provides enough I/O for Hall sensors, encoder inputs, and UART/diagnostic links.
Recomendado
Ceiling Fan and Pump Speed Controller
The PIC18LF4331-I/PT is well-suited for AC induction and BLDC ceiling fan controllers as well as small pump drives where variable speed and soft-start are required. The integrated PCPWM module handles the 3-phase switching directly, and the two analog comparators can monitor the back-EMF or zero-cross signals needed for commutation timing. The 256-byte EEPROM stores last-speed memory and run-time hours across power cycles, while nanoWatt power-saving modes reduce standby consumption to microampere levels when the fan or pump is idle. The 2.0V-5.5V supply range allows direct connection to rectified 3.3V or 5V rails without additional regulators. Designers can also leverage the AUSART port for IR remote control receiver interfaces or capacitive touch button decoding via timer-capture inputs.
Recomendado
HVAC Blower Driver
The PIC18LF4331-I/PT drives HVAC blower motors with closed-loop speed control by reading temperature sensor inputs through its 10-bit ADC and adjusting PWM duty cycle to maintain target airflow. The 8KB Flash accommodates lookup tables for fan curves across multiple operating modes (low, medium, high, auto), while the 768-byte SRAM holds the real-time PI controller state. The integrated PCPWM module generates the precise 3-phase waveforms required for sinusoidal or trapezoidal BLDC commutation, eliminating external gate-driver logic. The industrial temperature grade (-40C to +85C) suits under-hood and plenum mounting environments. Hardware fault inputs on the PCPWM module can be wired to overcurrent comparators for fast shutdown within microseconds, protecting both the motor and the power stage from fault conditions.
Recomendado
Small Appliance Motor Control
The PIC18LF4331-I/PT is a strong fit for small appliances like washing machine drum motors, dishwasher pumps, and kitchen mixer speed controllers, where 3-phase motor drive, low cost, and reliable firmware upgrades are key requirements. The 8KB Flash with self-programming support (ICSP - In-Circuit Serial Programming) enables field firmware updates via the UART boot-loader, reducing service cost over the appliance lifetime. The dual analog comparators provide low-latency current-limit sensing for stall protection, while the 256-byte EEPROM stores user settings (spin cycle, wash mode) across power cycles. The 2.0V-5.5V supply range is compatible with rectified mains (after step-down) and battery backup during power brownouts.
Recomendado
Sensor Signal Conditioning Front-End
The PIC18LF4331-I/PT functions as a smart sensor front-end, digitizing analog signals through its 10-bit ADC (up to 9 channels) and applying linearization, calibration, and temperature compensation algorithms in firmware before transmitting via AUSART or MSSP (SPI/I2C). The 8KB Flash accommodates piecewise calibration tables for thermocouples, RTDs, strain gauges, or load cells, while the 256-byte EEPROM stores calibration coefficients that survive power cycles. The nanoWatt technology power-saving modes (Idle at 5.8 uA typical, Sleep at 0.1 uA typical) extend battery life in wireless sensor applications where the MCU wakes periodically to take readings. The industrial -40C to +85C operating range supports outdoor and process-control deployments.
Recomendado
Industrial Control Board (5V Systems)
The PIC18LF4331-I/PT suits legacy 5V industrial control boards such as PLC I/O modules, conveyor controllers, and machine-tool interfaces where reliable 8-bit processing, 5V-tolerant I/O, and mature toolchains matter more than raw CPU horsepower. The 10 MIPS performance at 40 MHz handles encoder counting (via 16-bit timers), PWM actuator control, and Modbus RTU / RS-485 communication stacks via the integrated AUSART. The 34 digital I/O pins drive relays, optocouplers, and discrete LEDs without external I/O expanders, while the 2.0V-5.5V range supports both 3.3V and 5V logic level integration. The integrated ICD debug interface allows non-intrusive firmware development and in-system field diagnostics, reducing time-to-market for industrial OEMs.
Recomendado
Battery-Powered Sensor Hub
The PIC18LF4331-I/PT serves as the brain of a battery-powered multi-sensor hub, taking periodic readings from multiple analog and digital sensors, processing the data locally to reduce RF transmission burden, and forwarding summaries via the AUSART or MSSP (SPI/I2C) interfaces. The wide 2.0V-5.5V supply range supports 2-cell alkaline (3V) and 1-cell Li-ion (3.7V nominal) battery chemistries without a boost regulator. The nanoWatt Sleep mode (down to 0.1 uA typical) lets the MCU spend most of its life in deep sleep, waking on timer or external interrupts to take readings and transmit. The 256-byte EEPROM stores configuration, calibration, and sensor IDs that survive battery swaps, while the 8KB Flash accommodates edge-processing algorithms like moving-average filtering and threshold detection.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC18LF4331-I/PT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC18F4331-I/PT | PIC18LF4431-I/PT | PIC18F4431-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same |
| Core / Architecture | PIC18 8-bit RISC, 40 MHz / 10 MIPS | PIC18 8-bit RISC, 40 MHz / 10 MIPS | PIC18 8-bit RISC, 40 MHz / 10 MIPS | PIC18 8-bit RISC, 40 MHz / 10 MIPS |
| Program Memory (Flash) | 8 KB (4K x 16) | 8 KB (4K x 16) - same | 16 KB (8K x 16) - +100% | 16 KB (8K x 16) - +100% |
| Data Memory (SRAM) | 768 bytes | 768 bytes - same | 768 bytes - same | 768 bytes - same |
| EEPROM | 256 bytes | 256 bytes - same | 256 bytes - same | 256 bytes - same |
| I/O Pins | 34 | 34 - same | 34 - same | 34 - same |
| Operating Voltage (VDD) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) - narrows low end | 2.0 V to 5.5 V (LF) - same | 4.2 V to 5.5 V (F) - narrows low end |
| Motor-Control PWM Module | PCPWM, 3 complementary pairs + fault input | PCPWM, 3 complementary pairs + fault input - same | PCPWM, 3 complementary pairs + fault input - same | PCPWM, 3 complementary pairs + fault input - same |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same |
Diferenciadores clave
- Integrated 3-phase Power Control PWM (PCPWM) module with hardware fault input (frente a PIC18LF4321-I/ML)
- Wide 2.0V to 5.5V operating voltage (LF variant) (frente a PIC18F4331-I/PT)
- Compact 10x10 mm TQFP-44 footprint with all 34 I/O pins accessible (frente a PIC18LF4321-I/ML)
Notas de diseño
Estimated: Decouple each VDD/AVDD pin with a 100 nF X7R ceramic placed within 5 mm of the pin, and add a bulk 10 uF tantalum or aluminum-polymer capacitor on the main VDD rail. The 2.0V-5.5V supply range of the LF variant allows operation directly from a 3.3V regulator without a separate LDO. Place a ferrite bead or small resistor (10 ohm) between VDD and AVDD if the analog supply must be filtered separately to reduce ADC noise coupling from digital switching.
Place the 40 MHz crystal (or ceramic resonator) within 10 mm of OSC1/OSC2 (pins 9 and 10) and route the oscillator traces with a guard ring tied to ground to minimize EMI pickup. Keep PWM output traces (pins 13-18) short and direct to the gate-driver inputs; route fault input (pin 19, FLTA) as a separate trace away from PWM switching signals to prevent noise-induced false shutdowns. Maintain a continuous ground plane under the TQFP package and stitch vias around the perimeter at 5 mm spacing for thermal dissipation.
Do not leave MCLR (pin 37) floating; tie it to VDD through a 10 kohm pull-up resistor and a 100 nF capacitor to ground for proper reset behavior during power-up. Ensure the ICD pins RB6/PGC (pin 35) and RB7/PGD (pin 36) are not loaded with low-impedance circuits during in-circuit debugging, as this prevents reliable programming. Configure the PCPWM module's dead-band control registers before enabling PWM outputs to prevent shoot-through in the external gate driver. Always set the configuration bits (CONFIG1H through CONFIG3H) for the correct oscillator mode and watchdog timer settings in the source code before programming.
Estimated: The TQFP-44 package has a junction-to-ambient thermal resistance (theta_JA) of approximately 50 C/W on a standard 2-layer JEDEC test board. At 40 MHz with all peripherals active and 34 I/O pins toggling, the typical power dissipation is around 250 mW at 5V, resulting in a 12.5 C junction temperature rise above ambient. For industrial temperature designs near 85 C ambient, ensure the application does not push junction temperature above 125 C; reducing CPU clock to 20 MHz (via configuration bits) drops dissipation to approximately 100 mW.
Información de cumplimiento
RoHS and REACH compliance per Microchip product page; not AEC-Q100 qualified (industrial grade only, not automotive).