PIC18LF4221T-I/ML - 8-bit PIC MCU, 4KB Flash, 44-QFN | Microchip
MPN: PIC18LF4221T-I/ML ✓ Hoạt độngPIC18LF4221T-I/ML Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, Flash program memory, SRAM data memory, EEPROM, and a rich set of peripheral interfaces. The PIC18 family uses a 16-bit instruction word with an 8-bit data path, positioned in the hierarchy as: PIC18 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. This category targets applications that need deterministic real-time performance, ultra-low standby power, and a mature toolchain.
Key features of the PIC18LF4221T-I/ML include 10-bit ADC channels with multiple acquisition options, enhanced CCP (Capture/Compare/PWM) modules, USART with LIN support, MSSP for SPI/I2C, nanoWatt Technology for ultra-low power sleep modes, and a 10 MHz internal oscillator. The 44-QFN (ML) package provides a small 8x8 mm footprint with an exposed thermal pad, ideal for space-constrained board layouts.
Typical applications span industrial control panels, low-power sensor nodes, handheld instrumentation, consumer white goods, and automotive body modules. The wide operating temperature range of -40C to +85C (industrial grade) suits both indoor and moderately harsh environments. The 'T' suffix indicates Tape and Reel packaging for high-volume SMT assembly.
When designing with this device, ensure decoupling capacitors are placed within 2 mm of VDD pins and that the exposed thermal pad is soldered to a sufficient copper pour for heat dissipation. Use MPLAB X IDE with XC8 compiler and pickit or ICD programmers for development; the nanoWatt sleep modes can drop quiescent current below 1 uA for battery-powered designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4221T-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 PIC18LF4221T-I/ML (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Operating Temperature, Core.
PIC18LF4221-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4221-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4220-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4220T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4220T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4221T-I/ML Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit RISC, 16-bit instruction word) |
| Program Memory (Flash) | 4 KB (2K x 16) |
| Data SRAM | 512 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 36 (typical for 44-pin PIC18 family) |
| Communication Interfaces | USART (LIN-capable), MSSP (SPI/I2C), Enhanced CCP |
| Hộp | 44-pin QFN (8x8 mm) - designation 'ML' |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Low-Power Technology | nanoWatt Technology (sub-uA sleep modes) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF4221T-I/ML
| Chân 1 | MCLR/RA5 — Master Clear (reset) input / PORTA bit 5 |
| 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/T0CKI — PORTA bit 4 / Timer 0 clock input |
| Chân 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| Chân 8 | RE0/RD — PORTE bit 0 / Read control for PSP |
| Chân 9 | RE1/WR — PORTE bit 1 / Write control for PSP |
| Chân 10 | RE2/CS — PORTE bit 2 / Chip select for PSP |
| Chân 11 | VDD — Positive power supply (2.0V to 5.5V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKI/RA7 — Oscillator crystal input / external clock in / PORTA bit 7 |
| Chân 14 | OSC2/CLKO/RA6 — Oscillator crystal output / clock out / PORTA bit 6 |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 module |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 module |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 21 | RC6/TX/CK — PORTC bit 6 / USART async transmit / sync clock |
| Chân 22 | RC7/RX/DT — PORTC bit 7 / USART async receive / sync data |
| Chân 23 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Chân 24 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Chân 25 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Chân 26 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive power supply (2.0V to 5.5V) |
| Chân 33 | RB0/INT0/FLT0 — PORTB bit 0 / External interrupt 0 / ECCP fault input |
| Chân 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Chân 35 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Chân 36 | RB3/CCP2 — PORTB bit 3 / CCP2 module (alternate) |
| Chân 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Chân 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | EPAD — Exposed thermal pad - must be soldered to ground pour |
Ứng dụng tiêu biểu
PIC18LF4221T-I/ML phù hợp cho 7 Áp dụngs: Industrial Sensor Interface Module, Battery-Powered Handheld Instrument, Home Appliance Control Board, Automotive Body Control Module (Sub-function), IoT Edge Sensor Node (Non-Wireless), Consumer White Goods User Interface, Educational and Hobbyist Electronics Projects.
Industrial Sensor Interface Module
The PIC18LF4221T-I/ML fits industrial sensor interfaces thanks to its 10-bit ADC, 36 I/O pins, and wide 2.0V-5.5V supply range. Its nanoWatt sleep modes drop quiescent current below 1 uA, enabling 4-20 mA loop-powered transmitters that must draw under 3.5 mA total. The 44-QFN's 8x8 mm footprint and industrial -40C to +85C rating suit DIN-rail mounted analog front ends. Use the MSSP for SPI sensor connections and the USART for Modbus RTU or LIN bus output. Compared to a discrete ADC + MCU solution, integrating the ADC on-chip eliminates 3-5 external components and reduces BOM cost by approximately 20%.
Được đề xuất
Battery-Powered Handheld Instrument
The PIC18LF4221T-I/ML targets battery-powered handheld instruments where the LF variant's 2.0V minimum VDD allows operation down to nearly discharged single-cell Li-ion (3.0V) or even 2x AA alkaline packs. Its nanoWatt Technology provides multiple sleep modes (Sleep, Idle, Doze) that drop current to less than 1 uA when the device is inactive between measurements. The 4 KB Flash is sufficient for typical menu-driven firmware with calibration tables. The 44-QFN keeps the PCB under 25x25 mm, leaving room for a 2.4-inch LCD and Li-Po cell. The 10 MIPS performance ensures responsive UI updates without perceived lag.
Được đề xuất
Home Appliance Control Board
The PIC18LF4221T-I/ML suits home appliance control boards (washing machines, dishwashers, microwave ovens) where cost, reliability, and long-term availability are paramount. Its 36 I/O lines drive relay coils, triac gates, keypad matrices, and 7-segment displays simultaneously. The 10-bit ADC reads thermistor inputs for temperature regulation with better than 0.5C resolution. The 44-QFN (8x8 mm) provides mechanical robustness against vibration when the exposed pad is properly soldered. Compared to a 64-pin or 100-pin MCU, the PIC18LF4221T-I/ML saves approximately $0.50 per board while leaving headroom for future firmware enhancements.
Được đề xuất
Automotive Body Control Module (Sub-function)
Although the PIC18LF4221T-I/ML is industrial-grade (-40C to +85C) rather than AEC-Q100 qualified, it suits non-safety automotive body sub-functions like interior lighting controllers, seat position sensors, and HVAC trim controls. Its LIN-capable USART interfaces with the vehicle's LIN bus for sub-network communication. The 5.5V maximum VDD tolerates load-dump transients with proper external TVS protection. Engineers often pair the PIC18LF4221 with a PIC18F46K80 or PIC18F26K83 for the main body control module and use the 4221 as a satellite controller. Note: for AEC-Q100 applications, choose PIC18F25K80 or PIC18F46K80 instead.
Được đề xuất
IoT Edge Sensor Node (Non-Wireless)
The PIC18LF4221T-I/ML serves as the local MCU in wired IoT edge nodes - for example, RS-485 connected environmental sensors, Modbus-based building automation devices, or wired industrial IoT gateways. Its 4 KB Flash fits typical sensor-fusion firmware with averaging and threshold detection. The 512-byte SRAM holds 10-20 recent samples plus protocol buffers. Adding an external ENC28J60 or W5500 Ethernet controller enables TCP/IP connectivity. Compared to a 32-bit ARM Cortex-M0+ solution, the PIC18LF4221T-I/ML costs roughly 30-40% less and draws less sleep current, making it ideal for cost-optimized wired edge nodes.
Được đề xuất
Consumer White Goods User Interface
The PIC18LF4221T-I/ML drives user interface panels in consumer white goods - washing machine fronts, refrigerator displays, oven control boards. The 10-bit ADC reads rotary encoder positions and thermistor inputs; the PWM outputs drive LED backlights with 256 brightness levels. The USART interfaces with the main appliance controller or touch-panel daughter board. The 44-QFN's small footprint allows placement behind the display panel. With 36 I/O pins, the MCU can directly drive a 4x4 keypad matrix, 4 digit 7-segment LED display, and several status LEDs without external I/O expanders, reducing BOM and assembly cost.
Được đề xuất
Educational and Hobbyist Electronics Projects
The PIC18LF4221T-I/ML is widely used in university embedded systems courses and hobbyist projects due to its mature MPLAB X IDE ecosystem, abundant example code, and extensive documentation. The 44-QFN package can be challenging for breadboard prototyping, so designers typically use the PIC18LF4221-I/PT (44-TQFP) variant during development and switch to the QFN for production. The 40 MHz clock speed provides ample headroom for teaching real-time scheduling, interrupt handling, and peripheral configuration. Curriculum kits often pair this MCU with character LCDs, keypads, and sensor shields for hands-on learning.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4221T-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 | PIC18LF4221-I/ML | PIC18LF4220-I/ML | PIC18LF4220T-I/ML |
|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) ML | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 4 KB | 4 KB | 4 KB | 4 KB |
| Data SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| USB Peripheral | Yes (per 4221 family datasheet) | Yes | No | No |
| Packaging Format | Tape and Reel | Tray | Tray | Tape and Reel |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C |
| Core / Max Speed | PIC18 8-bit / 40 MHz (10 MIPS) | PIC18 8-bit / 40 MHz | PIC18 8-bit / 40 MHz | PIC18 8-bit / 40 MHz |
Bảo phân biệt quan trọng
- Tape and reel packaging for high-volume SMT assembly (vsPIC18LF4221-I/ML)
- Low-voltage 'LF' variant supports 2.0V minimum VDD (vsPIC18F4221-I/ML (non-LF))
- USB peripheral included vs 4220 sibling (vsPIC18LF4220-I/ML)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 2 mm of each VDD pin (pins 11 and 32) and a bulk 10 uF tantalum or aluminum-polymer capacitor on the main 3.3 V or 5 V rail. According to Microchip PIC18 hardware design guidelines, this decoupling arrangement prevents VDD droop during high-current I/O transitions and improves ADC noise performance. For battery-powered designs using nanoWatt sleep modes, expect quiescent current below 1 uA in Sleep mode with the watchdog timer disabled.
The 44-QFN's exposed thermal pad (pin 45) must be soldered to a ground pour with at least 8 thermal vias connecting to an internal ground plane. Without proper thermal connection, junction temperature can rise 15-20C above ambient at full 40 MHz operation, potentially triggering thermal shutdown in high-temperature environments. The recommended PCB layout uses a 5x5 array of 0.3 mm thermal vias under the exposed pad, each with a 0.1 mm annular ring.
Use a 4-layer PCB stack-up with continuous ground plane beneath the MCU for optimal EMI and signal integrity. Keep the analog input traces (RA0-RA5) short and isolated from digital switching signals (RC0-RC7, RD0-RD7) to minimize ADC crosstalk. The 44-QFN land pattern requires 0.5 mm pitch pads with NSMD (non-solder mask defined) openings per IPC-7351. Solder paste stencil aperture should be 80-90% of pad size to prevent QFN soldering defects.
Do not leave the MCLR pin floating - either tie it to VDD through a 10 kohm pull-up resistor or to the ICSP programmer's reset driver. Floating MCLR causes spurious resets in noisy environments. Also, configure all unused I/O pins as outputs driving low to minimize power consumption (floating CMOS inputs draw 10-50 uA each). Finally, enable the watchdog timer (WDT) in firmware to recover from unexpected code lockups.
When using the MSSP for SPI or I2C communication, add 10-22 ohm series resistors on SCK and SDO lines to dampen ringing caused by transmission-line effects. For I2C bus lengths above 50 mm, use 4.7 kohm pull-ups (vs the typical 10 kohm) to maintain fast rise times above the I2C spec minimum of 1000 ns even with 5 pF/mm cable capacitance. The PIC18LF4221's SMBus-compatible I/O thresholds handle this configuration reliably at 100 kHz and 400 kHz bus speeds.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C (not AEC-Q100 qualified). Lead-free and halogen-free per Microchip material declaration.
