PIC18LF2331T-I/MM - 8-bit 40MHz MCU, 8KB Flash, 22 I/O | Microchip
MPN: PIC18LF2331T-I/MM ✓ Hoạt độngPIC18LF2331T-I/MM Tóm tắt
An 8-bit PIC microcontroller is a Harvard-architecture RISC device that executes one instruction per clock cycle (except branches) and provides deterministic interrupt latency, which is essential in real-time embedded control. The PIC18 family sits within Microchip's broader 8-bit portfolio, alongside PIC10, PIC12, PIC16 and the newer PIC18 K-series, and forms the upper performance tier with the largest instruction set (77 instructions) and the richest peripheral mix. These MCUs typically replace discrete logic and analog circuitry in cost-sensitive industrial and consumer products by integrating CPU, non-volatile program memory, data EEPROM, RAM and configurable I/O on a single die.
Key features of the PIC18LF2331T-I/MM include an industrial temperature range of -40C to +85C, low-power sleep modes with nanoWatt technology, an enhanced flash program memory rated for typical endurance of 100K erase/write cycles, and on-chip data EEPROM of 256 bytes. The 28-QFN-S package reduces board footprint versus 28-pin SOIC while still exposing 22 general-purpose I/O lines and supports up to 10 MHz operation at 2.0V and 40 MHz at 4.2V-5.5V.
The device uses a 16-bit instruction word with a 21-bit program counter that can address 2 MB of linear program space, plus a hardware multiplier and 8x8 single-cycle hardware multiply. Peripheral integration includes up to five CCP/PWM channels, two analog comparators, two enhanced USART modules and a 10-bit A/D converter with up to 9 channels, enabling compact BLDC motor control, UPS, power-supply feedback and instrumentation front-ends.
Typical applications include sensorless and sensored BLDC/PMSM motor drives, switched-mode power supply digital feedback, industrial process control, HVAC fan control, small appliance motor control and battery chargers. Its wide operating voltage also makes it a fit for portable measurement and consumer appliances.
When designing with this part, ensure VDDCORE/VDD decoupling uses 100 nF and bulk caps placed within 5 mm of the pins, that unused I/O are configured as outputs low to minimize shoot-through current, and that the in-circuit serial programming (ICSP) pins (PGC/PGD) are accessible for firmware updates.
This page consolidates distributor pricing, drop-in alternatives drawn from Microchip's PIC18LF2331/2431 family and the broader PIC18F low-voltage portfolio, plus practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF2331T-I/MM — 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 PIC18LF2331T-I/MM (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, I/O Pins, ADC, Timers.
PIC18LF2431T-I/MM
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2331T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2331-I/MM
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2331-I/SP
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2331-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4331T-I/MM
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2539T-I/MM
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2331T-I/MM Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC |
| Family | PIC18F |
| CPU Core | PIC18 |
| Program Memory Size | 8 KB (4K x 16) Flash |
| RAM Size | 768 bytes |
| EEPROM Size | 256 bytes |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage Range (LF) | 2.0 V to 5.5 V |
| I/O Pins | 22 |
| ADC | 10-bit, up to 9 channels |
| PWM / CCP | 5 CCP/PWM channels |
| Communication | Enhanced USART, MSSP (SPI/I2C) |
| Nhiệt độ hoạt động | -40C to +85C (Industrial, 'I') |
| Hộp | 28-pin QFN-S (6x6 mm) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | MSL1 |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF2331T-I/MM
| Chân 1 | MCLR/RA5 — Master Clear (reset) input / RA5 GPIO |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Chân 6 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Chân 7 | VDD — Positive supply (2.0V-5.5V for LF variant) |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/RA7 — Crystal oscillator input / RA7 GPIO |
| Chân 10 | OSC2/RA6 — Crystal oscillator output / RA6 GPIO |
| Chân 11 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| Chân 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Chân 14 | RC3/CCP2 — PORTC bit 3 / Capture-Compare-PWM 2 |
| Chân 15 | RC4/CCP3 — PORTC bit 4 / Capture-Compare-PWM 3 |
| Chân 16 | RC5/CCP4 — PORTC bit 5 / Capture-Compare-PWM 4 |
| Chân 17 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 18 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 19 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 20 | RB3/CCP5 — PORTB bit 3 / Capture-Compare-PWM 5 |
| Chân 21 | RB4 — PORTB bit 4 |
| Chân 22 | RB5/PGM — PORTB bit 5 / low-voltage ICSP programming |
| Chân 23 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 24 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 25 | RC6/TX — PORTC bit 6 / EUSART transmit |
| Chân 26 | RC7/RX — PORTC bit 7 / EUSART receive |
| Chân 27 | VDD — Positive supply (second VDD pin) |
| Chân 28 | VSS — Ground reference (second VSS pin) |
| Chân EP | EP — Exposed thermal pad - tie to VSS |
Ứng dụng tiêu biểu
PIC18LF2331T-I/MM phù hợp cho 7 Áp dụngs: Sensorless BLDC Motor Control, Switched-Mode Power Supply Digital Feedback, HVAC Fan and Blower Control, Portable Battery-Powered Measurement, Small Appliance Motor Control (Food Processors, Mixers), Industrial Process Control and Instrumentation, Sensorless Bidirectional Pump Control.
Sensorless BLDC Motor Control
The PIC18LF2331T-I/MM is purpose-built for sensorless brushless DC motor control thanks to its integrated Motion Feedback Module (MFM) and 5-channel CCP/PWM. The MFM samples back-EMF zero-cross events and the 10-bit ADC converts phase currents while the PWM module drives a 3-phase inverter at up to 40 MIPS. The 2.0V-5.5V Vdd range enables direct operation from a single Li-ion cell via a boost converter, removing the need for a 5V rail. Code is portable across the PIC18F2331 family, so engineers can scale to PIC18F4431 for higher-end 3-phase systems without rewriting the control loop.
Được đề xuất
Switched-Mode Power Supply Digital Feedback
The PIC18LF2331T-I/MM provides digital control loop compensation for isolated and non-isolated DC-DC converters. Its 40 MIPS throughput supports average-current-mode control at 200 kHz switching frequency while the 10-bit ADC samples Vout and inductor current each switching cycle. The enhanced USART enables PMBus or UART telemetry, and the 8KB Flash holds lookup tables and PID coefficients. Compared to a pure analog UC3842 implementation, the PIC18LF2331T-I/MM adds adaptive dead-time, soft-start profiling and OVP/UVP/OCP diagnostics with no external glue logic.
Được đề xuất
HVAC Fan and Blower Control
In HVAC variable-speed fan and blower drives, the PIC18LF2331T-I/MM directly drives a 3-phase inverter or a single-phase AC fan motor via its CCP/PWM channels. The MFM block detects rotor position from back-EMF for sensorless operation, eliminating Hall-effect sensors and reducing wiring harness cost. Industrial -40C to +85C operation tolerates rooftop unit environments, while the 28-QFN 6x6 mm footprint fits inside a 30 mm diameter motor stator assembly. The PIC18 nanoWatt technology drops idle power below 1 uA for sleep-mode standby required by EnergyStar HVAC equipment.
Được đề xuất
Portable Battery-Powered Measurement
The PIC18LF2331T-I/MM 'LF' variant operates directly from a single Li-ion cell (3.0V-4.2V) without a boost regulator, ideal for handheld multimeters, insulation testers and clamp meters. The 10-bit ADC handles voltage, current and temperature sensing while the enhanced USART streams results to a Bluetooth or USB module. nanoWatt sleep currents below 100 nA extend battery life to >1000 hours of standby, and the 256-byte EEPROM stores calibration tables permanently. Industrial temperature grade ensures accuracy from -40C to +85C ambient.
Được đề xuất
Small Appliance Motor Control (Food Processors, Mixers)
In food processors, blenders and stand mixers, the PIC18LF2331T-I/MM provides closed-loop torque and speed control via its MFM and PWM peripherals. The 40 MIPS core updates the PWM duty every 25 us, delivering smooth start-up ramps and current limiting that protects the universal motor from stall damage. Cost-sensitive small appliances benefit from the 28-QFN footprint that fits a 25 mm x 25 mm controller PCB, and the 8KB Flash is sufficient for sensorless back-EMF firmware plus look-up tables. The /MM tape-and-reel format supports high-volume SMT assembly lines.
Được đề xuất
Industrial Process Control and Instrumentation
The PIC18LF2331T-I/MM supports industrial process loops requiring deterministic real-time response, such as 4-20 mA loop controllers, solenoid drivers and indicator panels. The 22 I/O pins drive multiplexed 7-segment displays and accept digital inputs from limit switches, while the 10-bit ADC reads bridge sensors for pressure or flow. The MSSP peripheral supports SPI for a 24-bit sigma-delta ADC like the MCP3551, upgrading loop resolution to 22 bits effective. The -40C to +85C industrial grade and 100K Flash endurance ensure 10+ year field life in PLC and SCADA modules.
Được đề xuất
Sensorless Bidirectional Pump Control
The PIC18LF2331T-I/MM implements bidirectional pump control for medical infusion and metering pumps by reading back-EMF in the inactive phase to determine rotor position. The CCP/PWM channels generate complementary 20 kHz drive signals with programmable dead-time to prevent shoot-through, while the analog comparators provide hardware overcurrent protection independent of the ADC. 8KB Flash fits the state-machine firmware plus flow-vs-PWM calibration, and the 256-byte EEPROM stores per-pump trim values. Compared to a 16-bit DSP-based design, the 8-bit PIC18 core is dramatically cheaper while still meeting IEC 60601 timing requirements.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF2331T-I/MM — 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 | PIC18LF2431T-I/MM | PIC18F2331-I/MM | PIC18LF4331T-I/MM | PIC18LF2539T-I/MM |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-QFN-S (6x6 mm) | 28-QFN-S (6x6 mm) - same | 28-QFN-S (6x6 mm) - same | 28-QFN-S (6x6 mm) - same | 28-QFN-S (6x6 mm) - same |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 16 KB | 24 KB |
| RAM | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 1.5 KB |
| Operating Voltage | 2.0 V - 5.5 V (LF) | 2.0 V - 5.5 V (LF) | 4.2 V - 5.5 V (F only) | 2.0 V - 5.5 V (LF) | 2.0 V - 5.5 V (LF) |
| Max CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| I/O Pins | 22 | 24 | 22 | 22 | 22 |
| ADC Channels | 9 channels, 10-bit | 11 channels, 10-bit | 9 channels, 10-bit | 9 channels, 10-bit | 9 channels, 10-bit |
| Motion Feedback Module | Yes (1 unit) | Yes (1 unit) | Yes (1 unit) | Yes (1 unit) | Yes (2 units) |
Bảo phân biệt quan trọng
- Integrated Motion Feedback Module for sensorless motor control (vsPIC18F2331-I/MM (standard-voltage variant))
- Low-voltage LF operation down to 2.0V (vsPIC18F2331-I/MM (standard-voltage variant))
- Same die across /MM, /ML, /SP, /SO packages (vsPIC18LF2331T-I/ML (tape-and-reel alternative))
Ghi chú thiết kế
Estimated: at Vdd=5.0V, 40 MHz clock, all peripherals enabled, the PIC18LF2331T-I/MM draws roughly 16-22 mA active and ~0.1 uA in sleep. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pin pair (pins 7/8 and 27/28 in the 28-QFN), plus a 10 uF bulk capacitor at the board supply input. Use a ferrite bead between the analog VDD and digital VDD if separating power planes. AVDD (if not bonded internally) must be tied to VDD directly; AVSS to VSS.
The 28-QFN 6x6 mm package has a thermal pad that MUST be soldered to a 5 mm x 5 mm copper pour on the PCB for both thermal dissipation and electrical ground. The exposed pad is internally bonded to VSS; connecting it to a ground plane reduces die-to-ambient thermal resistance theta_JA from ~85 C/W (no pad solder) to ~28 C/W. Maintain a 0.2 mm solder mask dam between the thermal pad and adjacent signal pads, and use a via-array (0.3 mm holes, 0.6 mm pitch) underneath the pad for heat conduction to inner ground layers.
Two common pitfalls when designing with PIC18LF2331T-I/MM: (1) The ICSP pins PGC (RB6) and PGD (RB7) are also general-purpose I/O - if pulled low at power-up the device enters ICSP mode instead of running user code. Add 10 kohm pull-ups on PGC and PGD or sequence your hardware to keep them high during reset. (2) When migrating between LF (2.0V) and F (4.2V) variants in the same design, verify the brown-out reset and low-voltage programming voltage thresholds in the configuration words; LF parts tolerate lower Vdd but need adjusted BOR settings to avoid spurious resets at 2.5V-3.0V.
The analog inputs AN0-AN4 share PORTA pins with digital I/O. To achieve 10-bit ADC accuracy, configure the TRISA register to set unused analog channels as digital outputs (not inputs) and add a 100 nF bypass on VREF+ if used. The ADC clock period TAD must be at least 1.6 us - at 40 MHz Fosc use a divide-by-16 ADC clock (Fosc/16 = 2.5 MHz, TAD = 0.4 us is too fast; use Fosc/64 = 625 kHz, TAD = 1.6 us). Acquisition time is approximately 19.7 us with 100 ohm source impedance and 5 pS sample capacitor.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product page; the 28-QFN package is Pb-free matte-tin plating. Industrial temperature grade (-40C to +85C), not AEC-Q100 qualified - for automotive motor control, choose a Q-graded PIC18 variant.
