PIC18F4221-E/ML - 8-bit MCU, 4KB Flash, 40MHz, 44-QFN | Microchip
MPN: PIC18F4221-E/ML ✓ פעילPIC18F4221-E/ML סקירה
Background — What is an 8-bit PIC microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripherals such as ADC, timers, and communication blocks. The PIC18 family sits in the mid-range tier of Microchip's PIC portfolio, between the baseline PIC10/12/16 families and the high-performance PIC24/dsPIC families. PIC18 cores use a Harvard-style RISC design with 16-bit instructions and an 8-bit data path, balancing code density, deterministic timing, and C-compiler friendliness. MCUs like the PIC18F4221 typically serve as the supervisory brain in embedded systems, offloading housekeeping tasks from a host processor or running standalone in cost-sensitive designs.
Key features that distinguish this device include the nanoWatt power-management suite (which provides multiple idle and sleep modes with current as low as nA typical), self-programmability that enables in-field firmware updates without external programmers, an ICD (In-Circuit Debugger) interface, and a wide peripheral mix that targets both sensor-interface and human-interface applications. The 256-byte EEPROM block adds wear-leveled non-volatile storage for parameters that must survive power cycles. Programmable pull-ups, interrupt-on-change, and ultra-low-power wake-up sources simplify matrix-key and remote-control designs.
Architecturally, the PIC18F4221 uses an 8-bit data bus with a 16-bit instruction word and a hardware multiplier (8x8 in one cycle). The Flash memory supports table reads/writes and run-time self-programming via ICSP, and the device includes a 31-level hardware stack. The 10-bit ADC supports 13 input channels with acquisition time programmable via ADCON registers. The MSSP peripheral supports both SPI master/slave and I2C master/slave modes with 7-bit or 10-bit addressing. The EUSART handles RS-232/RS-485 asynchronous communications and synchronous master/slave protocols.
Typical applications include industrial control modules, sensor signal conditioning, low-cost motor and lighting controllers, USB-to-UART bridges (when paired with a USB transceiver IC), home appliances with user interfaces, and battery-powered instrumentation that benefits from the nanoWatt sleep modes. The 44-pin QFN package provides a compact footprint for space-constrained designs while still exposing most of the PIC18 family's peripherals.
Design consideration: the 44-pin QFN's exposed thermal pad must be soldered to a ground pad on the PCB to meet the package's thermal and electrical performance; omitting the pad connection can degrade ADC accuracy and ESD robustness. When migrating firmware between PIC18F4221 variants (e.g., -I/ML industrial vs. -E/ML extended grade), verify that code-protection bits and oscillator configuration match the target application.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers shorten sourcing and qualification cycles for the PIC18F4221-E/ML.
חלופות תחליף ישיר עבור PIC18F4221-E/ML — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC18F4221-E/ML (אותו גורם צורה וטביעת רגל) — שונים ב Package, Operating Temperature, Timers, ADC, Core Architecture.
PIC18F4220-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4220T-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4220-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4220-E/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4553-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F46J50-I/ML
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18F47J53-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4221-E/ML דירוגים מרביים ומאפיינים חשמליים
| Core | PIC18 8-bit RISC |
| Program Memory | 4 KB Flash |
| SRAM | 512 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| מתח אספקה | 4.2 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, 13 channels |
| Analog Comparators | 2 |
| CCP Modules | 2 |
| Serial Interfaces | MSSP (SPI/I2C), EUSART (RS-232/RS-485) |
| Timers | 4 (TMR0/TMR1/TMR2/TMR3) |
| מארז | 44-pin VQFN (ML) with exposed pad |
| טמפרטורת פעולה | -40C to +125C (Extended, "E") |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
| Self-Programming / ICSP | Yes |
| nanoWatt Power Management | Yes |
תצורת פינים של PIC18F4221-E/ML
| פין 1 | RA2/AN2/VREF- — Digital I/O / analog input / ADC voltage reference low |
| פין 2 | RA3/AN3/VREF+ — Digital I/O / analog input / ADC voltage reference high |
| פין 3 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| פין 4 | RA5/AN4/SS — Digital I/O / analog input / SPI slave select |
| פין 5 | RA6/OSC2/CLKO — Digital I/O / oscillator output / clock output |
| פין 6 | RA7/OSC1/CLKI — Digital I/O / oscillator input / clock input |
| פין 7 | VDD — Positive supply voltage |
| פין 8 | VSS — Ground reference |
| פין 9 | RB0/INT0/FLT0 — Digital I/O / external interrupt 0 / PWM fault input |
| פין 10 | RB1/INT1 — Digital I/O / external interrupt 1 |
| פין 11 | RB2/INT2 — Digital I/O / external interrupt 2 |
| פין 12 | RB3/INT3/CCP2 — Digital I/O / external interrupt 3 / CCP2 output |
| פין 13 | RB4/KBI0 — Digital I/O / interrupt-on-change |
| פין 14 | RB5/KBI1 — Digital I/O / interrupt-on-change |
| פין 15 | RB6/KBI2/PGC — Digital I/O / interrupt-on-change / ICSP clock |
| פין 16 | RB7/KBI3/PGD — Digital I/O / interrupt-on-change / ICSP data |
| פין 17 | VDD — Positive supply voltage |
| פין 18 | VSS — Ground reference |
| פין 19 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock |
| פין 20 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| פין 21 | RC2/CCP1 — Digital I/O / CCP1 output |
| פין 22 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| פין 23 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| פין 24 | RC5/SDO — Digital I/O / SPI data out |
| פין 25 | RC6/TX/CK — Digital I/O / EUSART transmit / EUSART clock |
| פין 26 | RC7/RX/DT — Digital I/O / EUSART receive / EUSART data |
| פין 27 | VDD — Positive supply voltage |
| פין 28 | VSS — Ground reference |
| פין 29 | RD0 — Digital I/O port D bit 0 |
| פין 30 | RD1 — Digital I/O port D bit 1 |
| פין 31 | RD2 — Digital I/O port D bit 2 |
| פין 32 | RD3 — Digital I/O port D bit 3 |
| פין 33 | RD4 — Digital I/O port D bit 4 |
| פין 34 | RD5 — Digital I/O port D bit 5 |
| פין 35 | RD6 — Digital I/O port D bit 6 |
| פין 36 | RD7 — Digital I/O port D bit 7 |
| פין 37 | VSS — Ground reference |
| פין 38 | VDD — Positive supply voltage |
| פין 39 | RE0/RD/AN5 — Digital I/O / read control / analog input |
| פין 40 | RE1/WR/AN6 — Digital I/O / write control / analog input |
| פין 41 | RE2/CS/AN7 — Digital I/O / chip select / analog input |
| פין 42 | RE3/MCLR/VPP — Digital I/O / master clear / programming voltage |
| פין 43 | RA0/AN0 — Digital I/O / analog input |
| פין 44 | RA1/AN1 — Digital I/O / analog input |
יישומים טיפוסיים
PIC18F4221-E/ML מתאים עבור 7 יישוםs: Industrial Sensor Conditioning Module, Home Appliance User-Interface Controller, HVAC Fan and Blower Motor Controller, RS-232/RS-485 Sensor Network Node, Battery-Backed Data Logger, Automotive Interior Lighting Controller, Educational and Prototyping Platform.
Industrial Sensor Conditioning Module
The PIC18F4221-E/ML is well matched to industrial sensor-conditioning modules that digitize analog signals from thermocouples, RTDs, pressure transducers, or 4-20 mA loops. The 13-channel 10-bit ADC provides enough simultaneous-input headroom for multi-sensor front-ends while the 5V native supply matches typical industrial signal conditioning rails without level shifting. The extended -40C to +125C operating temperature grade allows deployment in unheated enclosures near motors or furnaces, and the nanoWatt sleep modes let battery-backed sensor nodes idle below 1 mA between measurements.
מומלץ
Home Appliance User-Interface Controller
Washing machines, dishwashers, ovens, and induction cooktops benefit from the PIC18F4221-E/ML's generous mix of 36 I/O pins, 13 ADC channels, and 2 CCP modules for driving triac-based dimmers, buzzer PWM tones, and segmented LED or LCD displays. The Extended temperature rating sustains control loops near heating elements, and the 256-byte EEPROM stores user preferences and last-cycle state through power cycles. Its nanoWatt idle keeps standby power below typical energy-star targets for white goods.
מומלץ
HVAC Fan and Blower Motor Controller
The PIC18F4221-E/ML drives single-phase BLDC or AC induction blower motors via its CCP modules configured as PWM outputs, with the 10-bit ADC sampling current-sense shunts or back-EMF dividers to implement closed-loop speed control. The 5V supply integrates directly with 24V-to-5V derived HVAC rails, and the -40C to +125C grade handles rooftop and attic-mounted equipment in summer peaks. The MSSP peripheral drives SPI/I2C sensors for temperature, humidity, and airflow feedback in a single MCU.
מומלץ
RS-232/RS-485 Sensor Network Node
The PIC18F4221-E/ML's integrated EUSART supports RS-232, RS-485, and synchronous serial protocols, making it a strong fit for half-duplex multidrop sensor networks in industrial building-automation and process-control plants. Its 5V signaling directly drives MAX485-style transceivers without level shifters, and the 256-byte EEPROM stores node address and calibration constants. Extended temperature operation lets it survive outdoor or cabinet-mounted deployment; nanoWatt sleep modes allow battery-backed nodes to maintain watch-dog polling.
מומלץ
Battery-Backed Data Logger
The PIC18F4221-E/ML powers low-power data loggers that sample sensors periodically and store records to either the on-chip 256-byte EEPROM or an external SPI/I2C EEPROM/FRAM. Its nanoWatt sleep current extends battery life in unattended environmental monitoring deployments, and the 10-bit ADC is sufficient for slow-changing phenomena such as temperature, humidity, and soil-moisture logging. The 36 I/O pins accept multiple sensor interfaces including 1-Wire, SPI, and I2C peripherals.
מומלץ
Automotive Interior Lighting Controller
Although not AEC-Q100 qualified, the PIC18F4221-E/ML is commonly designed into non-safety automotive interior applications such as ambient LED lighting, RGB footwell illumination, and courtesy-light fade controllers, particularly in commercial vehicle and aftermarket segments. The CCP/PWM modules generate smooth LED fade curves, the EUSART handles LIN or CAN-via-transceiver command links, and the Extended -40C to +125C temperature range survives cabin and under-dash thermal stress. Two analog comparators support zero-cross detection for AC-driven lighting.
מומלץ
Educational and Prototyping Platform
The PIC18F4221-E/ML is a popular teaching MCU on university curricula and DIY maker boards because of its manageable peripheral count, free MPLAB X IDE toolchain, and mature XC8 C compiler support. The 44-QFN package is supported by Microchip's Curiosity Development Platform and a wide ecosystem of third-party programmers/debuggers including PICkit 3, PICkit 4, and MPLAB SNAP. The Extended temperature grade lets students run classroom lab exercises outdoors or in vehicle-mounted projects.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18F4221-E/ML — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18F4220-I/ML | PIC18F4220T-I/ML | PIC18F4553-I/ML | PIC18F46J50-I/ML | PIC18F47J53-I/ML |
|---|---|---|---|---|---|---|
| Package | 44-QFN (ML) | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 4 KB | 4 KB | 4 KB | 24 KB | 64 KB | 128 KB |
| SRAM | 512 B | 512 B | 512 B | 2 KB | 3.8 KB | 3.8 KB |
| Max CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 48 MHz | 48 MHz | 48 MHz |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| Operating Temperature | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| USB Peripheral | No | No | No | Yes (USB 2.0 FS) | Yes (USB 2.0 FS OTG) | Yes (USB 2.0 FS OTG) |
| ADC Channels | 13 | 13 | 13 | 13 | 13 | 13 |
| I/O Pins | 36 | 36 | 36 | 34 | 34 | 34 |
מבדילים עיקריים
- Extended -40C to +125C temperature grade in a 44-QFN package (לעומתPIC18F4220-I/ML)
- Minimal 4 KB Flash / 512 B SRAM footprint optimized for cost-sensitive industrial control (לעומתPIC18F47J53-I/ML)
- 13 ADC channels on 36 I/O pins with 2 CCP/PWM blocks (לעומתPIC18F46J50-I/ML)
הערות תכנון
The 44-pin QFN (ML) package has an exposed thermal pad that must be soldered to the PCB ground plane. Per the Microchip PIC18F4221 datasheet, leaving the pad unconnected can degrade ADC accuracy by several LSBs and reduce ESD survivability to below 1 kV HBM. Use an array of thermal vias (typically 9 to 16 vias on a 1.0 mm pitch) connecting the pad to a ground pour on internal PCB layers.
Place a 0.1 uF ceramic decoupling capacitor as close as possible to each VDD pin (pins 7, 17, 27, 38) and a bulk 10 uF tantalum or ceramic capacitor near the MCU. The PIC18F4221-E/ML draws up to 16 mA at 40 MHz with all peripherals active; under-sizing the bulk capacitor causes VDD rail droop during CCP PWM transitions and may trigger brown-out resets if BOR is enabled.
When migrating firmware between PIC18F4221 temperature grades (-E vs -I), verify the CONFIG3H register's voltage regulator configuration bit. The Extended -40C to +125C grade supports the same 4.2V-5.5V supply as the industrial variant, but using a 3.3V supply rail on either grade will violate VDD_min and cause undefined Flash programming behavior.
Keep traces to the OSC1/OSC2 (RA7/RA6) pins short and shield them from switching signals such as PWM CCP outputs to avoid coupling noise into the system clock. If using an external crystal, add 1 MOhm resistor in parallel with the crystal load capacitors (typically 15-33 pF) per Microchip oscillator design guidelines to ensure stable start-up across the extended -40C to +125C range.
מידע על תאימות
RoHS and REACH compliance per Microchip product page. Lead-free reflow profile JEDEC J-STD-020. Not AEC-Q100 qualified - the PIC18F4221-E/ML targets industrial/consumer markets; for AEC-Q100 automotive designs, consult Microchip's automotive-qualified PIC18 catalog.