PIC18LF4420T-I/ML - 16KB Flash 8-bit MCU 44-QFN | Microchip
MPN: PIC18LF4420T-I/ML ✓ Hoạt độngPIC18LF4420T-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable peripherals. The PIC18LF architecture uses an enhanced 8-bit Harvard RISC core with a 16-bit instruction word, placing it within the broader hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The LF prefix designates the low-voltage variant, allowing battery-powered and 3.3 V designs without efficiency loss compared to the 5 V-only F-series.
Key features include nanoWatt Technology for dynamic power management with multiple idle and sleep modes, a 10-bit successive-approximation ADC with automatic acquisition, dual analog comparators, one Enhanced Capture/Compare/PWM (ECCP) module and one CCP module, MSSP (SPI/I2C) and Enhanced USART peripherals, a 16-bit timer/counter plus two 8-bit timers, and a 13-channel 10-bit ADC. The device supports in-circuit serial programming (ICSP) and self-programming.
The PIC18LF4420 implements an enhanced Harvard architecture with separate program and data buses, a hardware multiplier, and a priority-level interrupt controller supporting both vectored and polled interrupt models. nanoWatt Technology provides INTOSC, INTOSCIO, and secondary oscillator modes for low-power operation.
Typical applications include industrial control panels, low-power sensor nodes, HVAC thermostats, portable instrumentation, and battery-powered metering devices where the LF voltage range and QFN footprint enable compact PCB layouts. The 36 I/O pins provide flexible peripheral mapping for mixed analog and digital interfaces.
When designing with this device, ensure the QFN thermal pad is soldered to a sufficient copper pour for heat dissipation, place decoupling capacitors within 5 mm of each power pin, and configure the configuration bits correctly for the chosen oscillator mode.
This page synthesizes drop-in alternatives, comparison data, and practical design notes compiled from Microchip datasheets and distributor inventories.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4420T-I/ML — 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 PIC18LF4420T-I/ML (cùng hình factor và footprint) — khác nhau ở Package, ADC, Timers, Operating Temperature, Program Memory (Flash).
PIC18LF4420-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4520T-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4420T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F46K20-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4420T-I/ML Tỷ lệ tối đa & tính chất điện
| Architecture | PIC 8-bit Harvard RISC |
| Program Memory (Flash) | 16 KB |
| Data SRAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, 13 channels |
| Timers | 1 x 16-bit + 2 x 8-bit |
| PWM Modules | 1 ECCP + 1 CCP |
| Communication | MSSP (SPI/I2C) + Enhanced USART |
| Comparators | 2 analog comparators |
| Hộp | 44-pin QFN (ML) 8x8 mm |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC18LF4420T-I/ML
| Chân 1 | MCLR — Master Clear (Reset) input |
| Chân 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O / Analog channel 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / Analog channel 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O / Analog channel 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — Digital I/O / Parallel port read / Analog channel 5 |
| Chân 9 | RE1/WR/AN6 — Digital I/O / Parallel port write / Analog channel 6 |
| Chân 10 | RE2/CS/AN7 — Digital I/O / Parallel port chip select / Analog channel 7 |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKI/RA7 — Oscillator input / External clock / Digital I/O |
| Chân 14 | OSC2/CLKO/RA6 — Oscillator output / Clock output / Digital I/O |
| Chân 15 | RC0/T1OSO/T13CKI — Digital I/O / Timer1 oscillator output / Timer1 clock |
| Chân 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — Digital I/O / Parallel slave port data bit 0 |
| Chân 20 | RD1/PSP1 — Digital I/O / Parallel slave port data bit 1 |
| Chân 21 | RD2/PSP2 — Digital I/O / Parallel slave port data bit 2 |
| Chân 22 | RD3/PSP3 — Digital I/O / Parallel slave port data bit 3 |
| Chân 23 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 24 | RC5/SDO — Digital I/O / SPI data out |
| Chân 25 | RC6/TX/CK — Digital I/O / USART transmit / USART clock |
| Chân 26 | RC7/RX/DT — Digital I/O / USART receive / USART data |
| Chân 27 | RD4/PSP4 — Digital I/O / Parallel slave port data bit 4 |
| Chân 28 | RD5/PSP5 — Digital I/O / Parallel slave port data bit 5 |
| Chân 29 | RD6/PSP6 — Digital I/O / Parallel slave port data bit 6 |
| Chân 30 | RD7/PSP7 — Digital I/O / Parallel slave port data bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Chân 34 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Chân 35 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Chân 36 | RB3/CCP2 — Digital I/O / CCP2 alternate pin |
| Chân 37 | RB4 — Digital I/O / Interrupt-on-change |
| Chân 38 | RB5 — Digital I/O / Interrupt-on-change |
| Chân 39 | RB6/PGC — Digital I/O / ICSP clock / Interrupt-on-change |
| Chân 40 | RB7/PGD — Digital I/O / ICSP data / Interrupt-on-change |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | EP — Exposed thermal pad (connect to VSS) |
Ứng dụng tiêu biểu
PIC18LF4420T-I/ML phù hợp cho 6 Áp dụngs: Industrial Control Panels, Battery-Powered Sensor Nodes, HVAC Thermostats, Portable Instrumentation, Smart Energy Metering, Automotive Body Electronics (Non-Safety).
Industrial Control Panels
The PIC18LF4420T-I/ML is well-suited for industrial control panels requiring 36 I/O pins and a 10-bit ADC. Its 40 MHz CPU delivers 10 MIPS throughput, sufficient for real-time scanning of switch matrices, driving indicator LEDs, and managing relay-based actuator loads. The 2.0-5.5 V LF operating range simplifies integration with both legacy 5 V and modern 3.3 V logic, while the nanoWatt Technology sleep modes reduce quiescent current below 1 uA for standby efficiency. The 44-pin QFN package supports compact PCB layouts with sufficient copper area under the exposed thermal pad for thermal dissipation in enclosed industrial enclosures.
Được đề xuất
Battery-Powered Sensor Nodes
Low-power sensor nodes benefit from the PIC18LF4420T-I/ML's nanoWatt Technology and 2.0 V minimum operating voltage, allowing operation directly from two AA cells across their discharge curve. The 10-bit ADC with 13 channels supports multi-sensor acquisition (temperature, humidity, light), while the MSSP and USART peripherals enable I2C sensor interfacing and UART communication with radio modules. Sleep current below 1 uA extends battery life to multiple years in duty-cycled wake-measure-transmit scenarios, and the 40 MHz performance burst handles protocol processing without requiring an external crystal in many designs.
Được đề xuất
HVAC Thermostats
HVAC thermostat designs leverage the PIC18LF4420T-I/ML's combination of 10-bit ADC for temperature sensor reading (NTC thermistor or analog IC), PWM modules for controlling HVAC actuators and triac-fired loads, and Enhanced USART for communication with HVAC zoning systems. The 2.0-5.5 V supply range supports 24 VAC-derived rails after rectification, while the industrial -40C to +85C temperature range meets HVAC environmental specifications. The 16 KB Flash accommodates state-machine control logic, PID loop calculations, and user-interface handling for touchscreen or button-matrix interfaces without requiring an external memory expansion.
Được đề xuất
Portable Instrumentation
Handheld test and measurement instruments benefit from the PIC18LF4420T-I/ML's 40 MHz CPU for fast ADC sampling, on-chip EEPROM for calibration constants and user preferences, and the 44-pin QFN package for compact PCB integration. The 10-bit ADC with 13 channels supports multi-range voltage measurement, while the MSSP peripheral drives SPI LCD displays or I2C-based digital potentiometers for autoranging. The low-voltage LF operation extends battery runtime in field-portable instruments, and the 256-byte EEPROM provides non-volatile storage for instrument configuration without external memory.
Được đề xuất
Smart Energy Metering
Single-phase energy meter designs use the PIC18LF4420T-I/ML's 13-channel 10-bit ADC to sample voltage and current waveforms from current transformers and voltage dividers, while the 16-bit timer with CCP module captures zero-crossing events for power-factor calculation. The MSSP peripheral interfaces with EEPROM for accumulating energy totals, and the USART enables communication with concentrator modules via PLC or RF. The 2.0-5.5 V supply range accommodates direct operation from rectified mains-derived rails, and the industrial temperature range ensures metering accuracy in outdoor cabinet installations.
Được đề xuất
Automotive Body Electronics (Non-Safety)
Non-safety automotive body modules (window lift controllers, mirror adjusters, interior lighting) use the PIC18LF4420T-I/ML where 36 I/O pins handle multiple motor and lighting loads, the PWM modules provide motor speed control, and the ADC monitors current feedback. The LF 2.0-5.5 V range supports direct connection to 12 V battery rails via 5 V regulators, while the -40C to +85C industrial temperature range covers cabin and engine-bay-adjacent installations. For safety-critical or AEC-Q100 applications, designers should select the PIC18F4xK20 family with automotive qualification instead.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4420T-I/ML — 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 | PIC18LF4420-I/ML | PIC18LF4520T-I/ML | PIC18F4420T-I/ML | PIC18F46K20-I/ML |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin QFN (ML) | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same |
| Program Memory (Flash) | 16 KB | 16 KB | 32 KB (+100%) | 16 KB | 64 KB (+300%) |
| Data SRAM | 768 bytes | 768 bytes | 1.5 KB (+100%) | 768 bytes | 3.9 KB (+420%) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V (narrower) | 1.8 V to 3.6 V (narrower) |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz | 64 MHz (16 MIPS, +60%) |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
| ADC | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 14 channels (+1) |
| Packaging Format | Tape & Reel (T suffix) | Tray (no T) | Tape & Reel | Tape & Reel | Tray (no T) |
Bảo phân biệt quan trọng
- Drop-in upgrade with 2x memory available in same package (vsPIC18LF4520T-I/ML)
- Wider voltage range than F-series variant (vsPIC18F4420T-I/ML)
- Lower power consumption than F-series (vsPIC18F4420T-I/ML)
Ghi chú thiết kế
The QFN-44 package features an exposed thermal pad (pin 44) that MUST be soldered to a ground copper pour on the PCB to ensure mechanical reliability and thermal dissipation. Recommended minimum copper area is 1 square inch with at least 8 thermal vias (0.3 mm drill) connecting the top pad to internal ground planes. Inadequate soldering of the thermal pad is a common field failure mode for QFN packages.
Place 100 nF decoupling capacitors within 5 mm of each VDD pin (pins 11 and 32), with a single 10 uF bulk capacitor near the supply entry point. The PIC18LF4420's nanoWatt Technology allows deep sleep currents below 1 uA, but only if all unused I/O pins are configured as outputs (low) or inputs with the internal weak pull-up enabled to prevent floating-pin supply leakage. Avoid long PCB traces on VDD/VSS to prevent IR drops during ADC sampling.
When migrating code from PIC18F4420 to PIC18LF4420, ensure the BOR (Brown-Out Reset) voltage configuration bits match the supply range - the LF variant supports lower BOR thresholds (2.0 V vs 4.0 V on F-series). Configuration bits set for F-series will leave the LF device in an unstable state below 4 V. Additionally, the analog reference voltage pins (VREF+/VREF-) must be configured even when using internal references, or ADC readings will be incorrect.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product page. Not AEC-Q100 qualified - choose PIC18F4xK20 automotive variants for AEC-Q100 applications. Halogen-free status not explicitly stated in datasheet.