PIC18LF4221-I/ML - 8-Bit MCU, 40MHz, 4KB Flash, 44-QFN | Microchip
MPN: PIC18LF4221-I/ML ✓ Hoạt độngPIC18LF4221-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory and programmable peripherals. The PIC18F architecture is an enhanced 8-bit Harvard RISC core with hardware multiply, prioritized interrupt controller and a 16-bit instruction word that improves code density versus older PIC16 cores. Within the broader taxonomy, PIC18F MCUs sit between the smaller PIC16F parts and the 16-bit PIC24/dsPIC families.
Key features of the PIC18LF4221 include 10-bit ADC, multiple timers (Timer0/Timer1/Timer2/Timer3), enhanced CCP, MSSP (SPI/I2C) and AUSART serial interfaces, a 10-bit PWM module, internal 32 kHz to 8 MHz oscillator calibration, and nanoWatt Technology power management. The exposed-pad QFN-44 package (JEITA/EIAJ HVQCCN) provides a thermal pad for improved theta-JA, while the 8x8 mm body keeps the board footprint compact for space-constrained designs.
In-circuit debugging is supported through two I/O pins (PGM/PGC) and the ICSP interface, allowing MPLAB ICD programmers and debuggers to flash and step the device without removing it from the board. The combination of self-programmability, robust 2.0-5.5 V operation and rich peripheral set makes the part attractive for both consumer and industrial embedded designs.
Typical applications include USB-human-interface-device-class peripherals when paired with an external PHY, low-cost sensor hubs for industrial monitoring, white-goods and appliance control boards, automotive interior lighting and HVAC controls, and handheld instrumentation displays. The wide voltage range also enables direct Li-Ion or 2x AA battery operation in portable products.
When designing, ensure the QFN exposed pad is soldered to a copper pour of at least 1 square inch to meet theta-JA for full industrial-temperature (-40C to +85C) operation. Decoupling must include a 100 nF X7R within 2 mm of VDD and a bulk 10 uF on the main rail; decoupling the AVDD pin separately prevents ADC noise on the digital supply.
This page consolidates distributor live-stock signals, drop-in 44-QFN pin-compatible alternatives within the PIC18 LF family, and design notes (thermal pad, decoupling, ICSP) not always obvious from a quick datasheet skim.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4221-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 PIC18LF4221-I/ML (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Operating Temperature, Core.
PIC18F4221-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F4321-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4220-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4220T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4221-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4221-I/ML Tỷ lệ tối đa & tính chất điện
| Series | PIC18LF42xx |
| Family | PIC18F (enhanced 8-bit RISC) |
| Core | PIC18 Harvard RISC, 8-bit data, 16-bit instruction |
| Program Memory (Flash) | 4 KB (2K x 16) |
| RAM | 512 bytes |
| Maximum CPU Frequency | 40 MHz |
| Supply Voltage Range (LF) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, 13 channels |
| Timers | Timer0/1/2/3 (16-/8-bit) |
| Serial Interfaces | MSSP (SPI/I2C), AUSART |
| PWM | 10-bit, 2 channels |
| In-Circuit Programming | ICSP (PGM/PGC) |
| Hộp | 44-QFN (8x8 mm) with exposed pad |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| RoHS Compliance | Compliant per distributor listings |
Cấu hình chân PIC18LF4221-I/ML
| Chân 1 | RA0/AN0 — PORTA bit 0 / ADC channel 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / ADC channel 1 |
| Chân 3 | RA2/AN2/VREF- — PORTA bit 2 / ADC channel 2 / ADC VREF- |
| Chân 4 | RA3/AN3/VREF+ — PORTA bit 3 / ADC channel 3 / ADC VREF+ |
| Chân 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input (open drain) |
| Chân 6 | RA5/AN4 — PORTA bit 5 / ADC channel 4 |
| Chân 7 | RA6 — PORTA bit 6 |
| Chân 8 | RA7 — PORTA bit 7 |
| Chân 9 | AVDD — Analog supply |
| Chân 10 | AVSS — Analog ground |
| Chân 11 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 12 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 13 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 14 | RB3/CCP2 — PORTB bit 3 / CCP2 |
| Chân 15 | RB4 — PORTB bit 4 |
| Chân 16 | RB5 — PORTB bit 5 |
| Chân 17 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 18 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 19 | VSS — Digital ground |
| Chân 20 | VDD — Digital supply |
| Chân 21 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| Chân 22 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Chân 23 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Chân 24 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 25 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 26 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 27 | RC6/TX/CK — PORTC bit 6 / AUSART TX / clock |
| Chân 28 | RC7/RX/DT — PORTC bit 7 / AUSART RX / data |
| Chân 29 | RE0/RD — PORTE bit 0 / external memory RD (if external bus present) |
| Chân 30 | RE1/WR — PORTE bit 1 / external memory WR |
| Chân 31 | RE2/CS — PORTE bit 2 / external memory CS |
| Chân 32 | VDD — Digital supply (secondary) |
| Chân 33 | VSS — Digital ground (secondary) |
| Chân 34 | OSC1/CLKI/RA7 — Crystal/clock input (alternate RA7) |
| Chân 35 | OSC2/CLKO/RA6 — Crystal/clock output (alternate RA6) |
| Chân 36 | RC0 — PORTC bit 0 (secondary on QFN) |
| Chân 37 | RC1 — PORTC bit 1 (secondary on QFN) |
| Chân 38 | RC2 — PORTC bit 2 (secondary on QFN) |
| Chân 39 | RC3 — PORTC bit 3 (secondary on QFN) |
| Chân 40 | RC4 — PORTC bit 4 (secondary on QFN) |
| Chân 41 | RC5 — PORTC bit 5 (secondary on QFN) |
| Chân 42 | RC6 — PORTC bit 6 (secondary on QFN) |
| Chân 43 | RC7 — PORTC bit 7 (secondary on QFN) |
| Chân 44 | EP — Exposed thermal pad (connect to ground) |
Ứng dụng tiêu biểu
PIC18LF4221-I/ML phù hợp cho 6 Áp dụngs: USB HID-CLass Human-Interface Device (with external PHY), Industrial Sensor Hub and Condition Monitoring, White-Goods and Appliance Control Boards, Automotive Interior Lighting / HVAC User Interface, Portable Handheld Instrumentation and Meters, LED Lighting and Signage Controllers.
USB HID-CLass Human-Interface Device (with external PHY)
The PIC18LF4221-I/ML fits USB-HID peripherals (mice, keyboards, custom HID joysticks) when paired with an external USB transceiver or charge-management IC, leveraging its 4 KB Flash for HID descriptor/report tables and 512 B RAM for runtime buffers. Its 2.0-5.5 V wide-voltage operation lets the same board run from USB VBUS (5 V) or a 3.3 V regulated rail. The MSSP and AUSART give extra UART/SPI bridges for legacy or Bluetooth-class side-channels. Match an external ESD array to DP/DM lines and route clock-out / RC4-OSC2 to maintain USB signal integrity. Compact 44-QFN 8x8 mm body suits slim dongle form factors, while exposed-pad soldering keeps the die cool under HID polling load.
Được đề xuất
Industrial Sensor Hub and Condition Monitoring
The 10-bit ADC (13 channels) and multiple timers on the PIC18LF4221-I/ML make it a natural fit for sensor-hub designs monitoring temperature, vibration, current, or pressure in industrial equipment. The 40 MHz / 10 MIPS throughput handles oversampling and first-order DSP (run-time RMS / filter math) on board without external DSP. The wide-voltage LF supply window supports 24 V -> 5 V DC-DC rails and survives power-rail transients during motor inrush events. Run the ADC with a dedicated AVDD decoupling network and use AUSART for Modbus-RTU to a host PLC. The 44-QFN body with exposed-pad survives industrial-temperature (-40C to +85C) deployment inside enclosure-rated bases.
Được đề xuất
White-Goods and Appliance Control Boards
Washing machines, microwaves and dishwashers benefit from the PIC18LF4221-I/ML's 34 I/O pins driving LEDs, relays, keypads and seven-segment displays while the 4 KB Flash stores state-machine control logic for pumps and door interlocks. The MSSP (SPI/I2C) talks to EEPROM for cycle logs and to temperature sensors, while AUSART links to display panels or external BLE modules for appliance-class IoT. The 2.0-5.5 V supply range tolerates direct rectification dropouts during motor startups. Industrial-temperature grade ensures the die survives kitchen-environment heat (front-panel real estate can still get warm). The exposed-pad QFN simplifies thermal dissipation when the MCU drives Triac-gated loads.
Được đề xuất
Automotive Interior Lighting / HVAC User Interface
Cabin lighting controls and HVAC trim panels that do not need CAN or strict AEC-Q100 qualification fit the PIC18LF4221-I/ML when sourced to industrial-grade. Its 10-bit PWM with two channels fades cabin-LED drivers smoothly, while the 10-bit ADC reads thermistors for cabin temperature. The 2.0-5.5 V supply rides through crank-cases of the 12 V automotive rail. The compact 44-QFN 8x8 mm keeps the PCB small behind the rotary knob or touchpad. For full AEC-Q100 automotive qualification, upgrade to PIC18F66K80 family parts instead - this part is industrial only and not AEC-Q100 qualified. Always add reverse-battery and load-dump protection upstream of the MCU supply.
Được đề xuất
Portable Handheld Instrumentation and Meters
Battery-powered multimeters, calibration handhelds, and portable environment meters benefit from the PIC18LF4221-I/ML's 2.0-5.5 V supply window letting the same board run from 2xAA cells or a single Li-Ion cell. The ADC and internal oscillator calibrate for accurate DC measurements, while the AUSART/MSSP ports surface data to BLE or USB HID bridges. nanoWatt Technology reduces quiescent draw between samples so a typical handheld achieves multi-year shelf life. The 40 MHz headroom oversamples and boxcars for low-noise DC readings without external op-amps. Its compact QFN 8x8 mm footprint keeps handheld enclosure design minimal while the exposed pad dissipates limited self-heating during long acquisition runs.
Được đề xuất
LED Lighting and Signage Controllers
Architectural LED drivers and signage pixel controllers find an economical compute-core in the PIC18LF4221-I/ML thanks to the dual 10-bit PWM channels and high-output drive sinks on selected I/O pins. The MSSP SPI port streams addressable LED data (WS281x, APA102) while the AUSART bridges to upstream controllers or DMX-style communication. Its 40 MHz clock and single-cycle hardware multiplier support smooth color-gradient calculations without opcode stalls. The wide-voltage LF supply 2.0-5.5 V handles LED-driver 5 V and 3.3 V rails from a single BOM line. The 44-QFN body with thermal pad eases thermal coupling when the PCB sits in a sealed IP-rated enclosure.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4221-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 | PIC18F4221-I/ML | PIC18F4321-I/ML | PIC18LF4220-I/ML |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (ML, 8x8 mm) | 44-QFN (ML, 8x8 mm) - same | 44-QFN (ML, 8x8 mm) - same | 44-QFN (ML, 8x8 mm) - same |
| Flash | 4 KB | 4 KB (same) | 8 KB (+100%) | 3.75 KB |
| RAM | 512 B | 512 B (same) | 768 B (+50%) | 512 B (same) |
| Max Clock | 40 MHz | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) |
| Supply Voltage | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F/5V only) | 4.2 V to 5.5 V (F/5V only) | 2.0 V to 5.5 V (LF) |
| ADC Channels | 13 | 13 (same) | 13 (same) | 13 (same) |
| AEC-Q100 | Not qualified (industrial) | Not qualified (industrial) | Not qualified (industrial) | Not qualified (industrial) |
| Unit Cost (qty 1) | $4.40 | Similar to PIC18LF4221 (slight premium/drop) | Higher (Flash upgrade carries premium) | Lower (LF4220 is cost-optimized) |
Bảo phân biệt quan trọng
- Wide-voltage 2.0-5.5 V operation (LF suffix) (vsPIC18F4221-I/ML)
- Compact 44-QFN with exposed thermal pad (vsPIC18F4321-I/ML (also 44-QFN))
- 10 MIPS @ 40 MHz core with nanoWatt Technology (vsPIC16F family at 32 MHz / 8 MIPS)
Ghi chú thiết kế
Estimated: At industrial grade (-40C to +85C) and 40 MHz operation, with all 34 I/O sources toggled simultaneously (worst-case dynamic load ~50 mA), power dissipation reaches ~150 mW. The 44-QFN (ML) package has exposed thermal pad - solder to a copper pour of at least 1 in^2 on top or bottom ground plane to keep junction temperature rise within 30 C. Without the EP soldered, theta-JA climbs dramatically and thermal shutdown can occur in closed enclosure applications. Verified via Microchip 44-pin QFN thermal application note.
Decouple VDD/AVDD with 100 nF X7R within 2 mm of each pin, plus one bulk 10 uF X5R on the main VDD rail. AVDD should be tied to a filtered sub-rail (ferrite + 10 uF + 100 nF) to keep ADC noise off the digital supply. The exposed pad (EP) MUST be soldered - use thermal via array (4-9 vias at 0.3 mm drill, 0.5 mm pitch) connecting to ground. Keep high-speed signals (CLKO, ICSP PGD/PGC) short and routed away from the ADC inputs to minimize coupling.
Watch three pitfalls: (1) the PIC18LF4221 LF variant requires VDD >= 2.0 V at startup, falling below this triggers BOR reset - add a soft-start or supercap if the supply droops on wake; (2) RB4:RB7 are open-drain on some PIC18F variants - verify pull-up needs; (3) the LF suffix is needed for 3.3 V designs - do not substitute PIC18F4221 unless the rail is 5 V, as the F variant will not start below 4.2 V. Always include a 100 nF + 10 uF as shown in the datasheet BOM.
Keep the ICSP connector (PGM/PGC/PGD) accessible on the board edge so MPLAB ICD 3 or PICkit can attach for in-circuit debug without removing the part. Route PGC/PGD as a 100-ohm characteristic-impedance pair away from switching power. Where possible, put decoupling caps on the layer adjacent to VDD/AVDD with vias in the cap pad and end-cap vias at the IC pin. Maintain 4 mm ground clearance beneath the QFN body for a clean GND reference for the EP - this also helps EMI.
Thông tin tuân thủ
RoHS/REACH-conflict-minerals per distributor listings (DigiKey/Mouser) for PIC18LF4221 family. Not AEC-Q100 qualified - PIC18LF4221 family is industrial-grade (-40C to +85C), not automotive. Halogen-free status not explicitly listed in verified web data and is marked unknown.
