PIC18LF4431-I/PT - 8-bit PIC MCU, 16KB Flash, 40MHz, 44-TQFP | Microchip
부품 번호: PIC18LF4431-I/PT ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
PIC18LF4431-I/PT 개요
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory, data memory, and peripheral interfaces on a single die, allowing embedded control of sensors, actuators, and communication buses. The PIC18 family belongs to the broader 8-bit RISC microcontroller hierarchy, which itself sits within the wider class of microcontrollers (MCU) -> embedded processors -> semiconductor devices. PIC18 MCUs implement a modified Harvard architecture with a 16-bit instruction word and 8-bit data path, optimized for deterministic interrupt latency and low-power sleep modes.
Key features of the PIC18LF4431 include the nanoWatt power-management suite (multiple idle and sleep modes), a 10-bit ADC with up to 9 input channels, a 14-bit High-Speed PWM module suitable for motor control and power conversion, two USART modules for asynchronous and synchronous serial communication, an I2C/SPI peripheral pair, and an enhanced Capture/Compare/PWM (ECCP) module. The device supports in-circuit serial programming (ICSP) and in-circuit debugging (ICD) via Microchip's MPLAB toolchain, enabling rapid firmware iteration.
Architecturally, the PIC18LF4431 uses Microchip's enhanced flash cell with a 100K erase/write cycle endurance and a typical data retention of greater than 40 years. The 8-bit data path and 16-bit instruction word deliver up to 10 MIPS at 40 MHz, with most single-word instructions executing in 4 clock cycles. Internal oscillator options and a wide operating voltage range (2.0V to 5.5V) provide design flexibility for battery-powered and industrial 24V-tolerant systems with external regulation.
Typical applications include BLDC and brushed DC motor control, switched-mode power supply (SMPS) digital control loops, industrial sensor conditioning, HVAC fan control, LED lighting drivers, and automotive body/comfort subsystems. The 14-bit PWM with 60 ns resolution is especially valuable in digital power and motor-drive applications where fine duty-cycle granularity is required.
Designers should note that the 5.5V absolute maximum on VDD requires a brown-out reset (BOR) configuration in firmware and adequate decoupling (100 nF + 10 uF bulk) within 5 mm of the supply pins. Migration between PIC18F and PIC18LF variants is straightforward because they share the same pinout, but the LF variant's lower minimum voltage (2.0V vs 4.2V) must be respected during firmware power-mode selection.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a single, citable reference for sourcing and substitution decisions.
드롭인 대체품: PIC18LF4431-I/PT — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PIC18LF4431-I/PT (동일 폼 팩터 및 풋프린트) — 차이점: Core Architecture, Timers, Package, Operating Temperature, Communication.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
PIC18LF4431T-I/PT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
PIC18F4431-I/PT
✅ 드롭인✓ 재고 있음
$4.79 / 개
데이터시트 보기 →PIC18F4431T-I/PT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
PIC18LF4423-I/PT
✅ 드롭인✓ 재고 있음
$3.58 / 개
데이터시트 보기 →PIC18F4331-I/PT
✅ 드롭인✓ 재고 있음
$3.05 / 개
데이터시트 보기 →PIC18F4431-E/PT
✅ 드롭인✓ 재고 있음
$6.1 / 개
데이터시트 보기 →PIC18LF4431-I/PT 최대 정격 & 전기적 특성
| Core | PIC18 (8-bit RISC, modified Harvard) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data SRAM | 768 bytes |
| Data EEPROM | 256 bytes |
| 최대 클록 주파수 | 40 MHz |
| Instruction Throughput | 10 MIPS |
| ADC | 10-bit, up to 9 channels |
| PWM | 14-bit High-Speed PWM module |
| Digital I/O Pins | 34 I/O |
| Operating Voltage | 2.0 V to 5.5 V |
| 동작 온도 | -40 C to +85 C (Industrial) |
| 패키지 | 44-pin TQFP (10x10 mm) |
| 실장 유형 | Surface Mount |
| Communication | 2x USART (AUSART), I2C, SPI |
| Programming/Debug | ICSP, ICD via MPLAB |
| RoHS 상태 | Compliant |
PIC18LF4431-I/PT 핀 구성
| 핀 1 | OSC1/RA7 — Oscillator input or digital I/O RA7 |
| 핀 2 | OSC2/RA6 — Oscillator output or digital I/O RA6 |
| 핀 3 | RA0/AN0 — Digital I/O RA0 or analog input AN0 |
| 핀 4 | RA1/AN1 — Digital I/O RA1 or analog input AN1 |
| 핀 5 | RA2/AN2/VREF- — Digital I/O RA2, analog input AN2, or ADC VREF- |
| 핀 6 | RA3/AN3/VREF+ — Digital I/O RA3, analog input AN3, or ADC VREF+ |
| 핀 7 | RA4/AN4 — Digital I/O RA4 or analog input AN4 |
| 핀 8 | RA5/AN5/SS — Digital I/O RA5, analog input AN5, or SPI slave select |
| 핀 9 | VSS — Ground reference |
| 핀 10 | VDD — Positive supply voltage (2.0V-5.5V) |
| 핀 11 | RB0/INT0/FLT0 — Digital I/O RB0, external interrupt 0, or PWM fault input |
| 핀 12 | RB1/INT1 — Digital I/O RB1 or external interrupt 1 |
| 핀 13 | RB2/INT2 — Digital I/O RB2 or external interrupt 2 |
| 핀 14 | RB3/INT3 — Digital I/O RB3 or external interrupt 3 |
| 핀 15 | RB4 — Digital I/O RB4 |
| 핀 16 | RB5 — Digital I/O RB5 |
| 핀 17 | RB6/PGC — Digital I/O RB6 or ICSP clock input |
| 핀 18 | RB7/PGD — Digital I/O RB7 or ICSP data input/output |
| 핀 19 | VSS — Ground reference |
| 핀 20 | VDD — Positive supply voltage (2.0V-5.5V) |
| 핀 21 | RC0/T1OSO/T1CKI — Digital I/O RC0, Timer1 oscillator output, or Timer1 clock input |
| 핀 22 | RC1/T1OSI — Digital I/O RC1 or Timer1 oscillator input |
| 핀 23 | RC2/CCP1 — Digital I/O RC2 or Capture/Compare/PWM channel 1 |
| 핀 24 | RC3 — Digital I/O RC3 |
| 핀 25 | RC4 — Digital I/O RC4 |
| 핀 26 | RC5 — Digital I/O RC5 |
| 핀 27 | RC6/TX/CK — Digital I/O RC6, USART TX, or USART clock |
| 핀 28 | RC7/RX/DT — Digital I/O RC7, USART RX, or USART data |
| 핀 29 | RE0/RD — Digital I/O RE0 or parallel port RD |
| 핀 30 | RE1/WR — Digital I/O RE1 or parallel port WR |
| 핀 31 | RE2/CS — Digital I/O RE2 or parallel port CS |
| 핀 32 | VSS — Ground reference |
| 핀 33 | VDD — Positive supply voltage (2.0V-5.5V) |
| 핀 34 | PWM1 — 14-bit PWM channel 1 output |
| 핀 35 | PWM2 — 14-bit PWM channel 2 output |
| 핀 36 | PWM3 — 14-bit PWM channel 3 output |
| 핀 37 | RD0 — Digital I/O RD0 |
| 핀 38 | RD1 — Digital I/O RD1 |
| 핀 39 | RD2 — Digital I/O RD2 |
| 핀 40 | RD3 — Digital I/O RD3 |
| 핀 41 | RD4 — Digital I/O RD4 |
| 핀 42 | RD5 — Digital I/O RD5 |
| 핀 43 | RD6 — Digital I/O RD6 |
| 핀 44 | RD7 — Digital I/O RD7 |
일반적인 애플리케이션
PIC18LF4431-I/PT 적합 용도: 7 애플리케이션s: BLDC and PMSM Motor Control, Digital Switched-Mode Power Supply (SMPS) Control, Industrial Sensor Signal Conditioning, HVAC Fan and Blower Control, Automotive Body and Comfort Subsystems, LED Lighting Drivers and Dimming, Consumer Appliance User Interface.
BLDC and PMSM Motor Control
The PIC18LF4431-I/PT's 14-bit High-Speed PWM module with up to 60 ns resolution at 40 MHz is engineered for field-oriented control of brushless DC and permanent-magnet synchronous motors, where commutation timing must be precise to minimize torque ripple. Its 10 MIPS throughput is sufficient to run sensorless back-EMF estimators or basic FOC loops at typical 20 kHz PWM rates. The 34 digital I/O pins accept Hall sensor inputs, quadrature encoder signals, and fault lines from the gate driver, while the 2.0-5.5V supply lets the MCU share the 3.3V logic rail with companion gate drivers like the MCP8026. In a 24V cordless drill or HVAC blower, this combination delivers smoother speed control and quieter operation than 10-bit PWM alternatives.
추천
Digital Switched-Mode Power Supply (SMPS) Control
The PIC18LF4431-I/PT can implement digital control loops for isolated and non-isolated DC-DC converters, leveraging the 14-bit PWM for primary-side switching and a 10-bit ADC for output voltage/current sensing. At 10 MIPS, the firmware can run a multi-pole digital compensator at 100 kHz with comfortable headroom, suitable for telecom and industrial POL converters. The integrated USART peripherals report telemetry to a host controller, while the I2C/SPI bus accepts digital references and trim commands. Designers commonly pair this MCU with a UCC25640 LLC controller replacement architecture or use it standalone for sub-100W buck/boost stages where analog control would be too rigid.
추천
Industrial Sensor Signal Conditioning
In a 4-20 mA loop-powered transmitter or industrial sensor interface, the PIC18LF4431-I/PT provides 16KB of flash for sensor linearization, 768B of SRAM for moving-average filtering, and a 10-bit ADC with up to 9 input channels to multiplex multiple transducers. Its -40C to +85C industrial temperature grade ensures operation in factory-floor enclosures, and the 2.0V low-voltage capability supports 3.3V sensor rails. The USART peripherals stream digitized readings over RS-485 or RS-232, while nanoWatt sleep modes cut quiescent current for loop-powered designs that must consume less than 3.5 mA. Typical uses include pressure transmitters, RTD signal conditioners, and flow-meter front ends.
추천
HVAC Fan and Blower Control
Variable-speed HVAC fans demand smooth, low-noise PWM control with closed-loop tachometer feedback. The PIC18LF4431-I/PT's 14-bit PWM generates 25 kHz switching frequencies above the audible band, while its Capture/Compare/PWM (CCP) input measures tachometer pulses for RPM regulation. At 2.0V minimum supply, the same hardware can run from a 3.3V standby rail during low-power modes and the full 5V when the compressor engages. The 34 I/O lines easily accommodate multiple fan drivers, status LEDs, and a Modbus or BACnet UART interface to the building automation system.
추천
Automotive Body and Comfort Subsystems
Within 12V automotive body modules - window lifters, seat controllers, mirror adjusters - the PIC18LF4431-I/PT provides 34 I/O pins for H-bridge drivers, current-sense amplifiers, and switch-matrix scanning. Its 5.5V absolute-maximum supply tolerates load-dump transients when paired with a TVS diode and is sufficient for 12V battery rail operation. Designers should add the AEC-Q100 grade PIC18F4431-I/PT variant for OEM automotive designs; the I-grade PIC18LF4431 is widely used in aftermarket and non-safety automotive subsystems such as auxiliary lighting and accessory controllers where automotive qualification is not contractually mandated.
추천
LED Lighting Drivers and Dimming
Architectural and stage LED fixtures require fine-grained dimming with logarithmic-perception correction. The PIC18LF4431-I/PT's 14-bit PWM provides 16384 brightness steps per channel - well beyond the 256 steps of 8-bit PWM - enabling smooth low-end fade and dot-corrected brightness across multi-channel fixtures. Its 10 MIPS headroom runs DMX512 or DALI protocol stacks over USART, and the 2.0V minimum supply supports direct Li-ion battery operation in portable lighting rigs. The device's 34 I/O pins can drive up to four high-current LED strings through external MOSFET drivers with PWM dimming, while 10-bit ADC channels monitor LED temperature via NTC thermistors for thermal fold-back protection.
추천
Consumer Appliance User Interface
White-goods appliances - washing machines, induction cooktops, microwave ovens - need a responsive user interface with capacitive touch sensing, rotary encoder inputs, and LCD/segment display driving. The PIC18LF4431-I/PT's 34 I/O pins accept multiple encoder outputs and capacitive-sense electrodes driven via firmware, while its nanoWatt idle modes cut standby power below 0.5 mA to meet energy-efficiency regulations. The USART peripherals connect to a host appliance controller, and the 16KB flash comfortably holds UI state machines and fault-handling routines. Typical turn-around for an appliance UI redesign using this part is 8-12 weeks including UL/IEC 60730 safety-class B firmware certification support.
추천
추천 제품 요약
엔지니어링 참조 데이터: PIC18LF4431-I/PT — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | PIC18LF4431T-I/PT | PIC18F4431-I/PT | PIC18F4431T-I/PT | PIC18LF4423-I/PT | PIC18F4331-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP - same | 44-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB | 8 KB |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 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 | 4.2 V to 5.5 V |
| PWM | 14-bit High-Speed | 14-bit High-Speed | 14-bit High-Speed | 14-bit High-Speed | 10-bit CCP | 10-bit CCP |
| ADC | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit | 10-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Digital I/O | 34 I/O | 34 I/O | 34 I/O | 34 I/O | 36 I/O | 36 I/O |
주요 차별점
- 14-bit High-Speed PWM with 60 ns resolution (vs PIC18LF4423-I/PT)
- Extended low-voltage operation down to 2.0V (vs PIC18F4431-I/PT)
- Same package, code-compatible F/LF migration path (vs PIC18LF4431T-I/PT)
설계 노트
Place a 100 nF X7R decoupling capacitor within 5 mm of each VDD pin (pins 10, 20, 33) and a shared 10 uF bulk tantalum or ceramic capacitor at the supply entry point. The PIC18LF4431-I/PT has three VDD/VSS pin pairs; floating any pair can cause brown-out reset misfires. For battery applications, configure the BOR (brown-out reset) via the CONFIG2L register to a threshold below the minimum battery voltage to avoid spurious resets during discharge transients. Estimated: with 16KB flash active and a 40 MHz oscillator, peak VDD current is approximately 16 mA in active mode and drops to microampere range in sleep mode per the nanoWatt specification.
At 40 MHz and 5.5V supply, the PIC18LF4431-I/PT dissipates approximately 88 mW (estimated: 16 mA active * 5.5V). The 44-pin TQFP package has a thermal resistance theta_JA of approximately 50 C/W on a 2-layer JEDEC test board, yielding a 4.4 C junction temperature rise above ambient at full active load - well within the 125 C absolute maximum. Designers do not normally need a heatsink, but in sealed enclosures with no airflow, derate the oscillator frequency above 60 C ambient to keep junction temperature below 100 C. The 14-bit PWM outputs are not high-current drivers; do not source/sink more than 25 mA per pin or 200 mA total across the package.
Route the 14-bit PWM outputs and the 10-bit ADC reference traces on inner layers with a contiguous ground plane to minimize switching noise coupling into the analog sections. Keep PWM traces short (under 50 mm) and avoid running them parallel to the analog ADC inputs. Place the crystal or external oscillator within 10 mm of OSC1/OSC2 (pins 1-2) and guard the traces with a ground ring; long oscillator traces are a common source of EMC compliance failures. For ICSP debugging, expose pins 17 (PGC) and 18 (PGD) to a 0.1 inch header or test pad so that the MPLAB ICD 5 can attach without rework.
Three pitfalls are common in PIC18LF4431-I/PT designs. (1) Confusing the LF and F variants: PIC18LF4431 supports 2.0V minimum supply, but PIC18F4431 does not - firmware written for 3.3V operation will not run on the F variant without a voltage regulator. (2) Forgetting to disable the PWRT (power-up timer) in configuration bits for fast-start applications, adding an unnecessary 72 ms delay after POR. (3) Driving the analog AN0-AN7 pins with source impedances above 2.5 kohm will degrade ADC accuracy due to input leakage; buffer analog sources with an op-amp like MCP6L01 if higher source impedance is unavoidable.
규정 준수 정보
RoHS and REACH compliance per Microchip product page. The PIC18LF4431-I/PT is industrial-grade (-40C to +85C) and is not AEC-Q100 qualified; for automotive applications use the AEC-Q100 grade PIC18F4431-I/PT variant or contact Microchip for the AEC-Q100 qualified PIC18LF4431 part number.