PIC18LF2221-I/SS - 40MHz 8-bit MCU, 4KB Flash, 28-SSOP | Microchip
料号： PIC18LF2221-I/SS ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.84 | $28.40 |
| 100 | $2.51 | $251.00 |
| 500 | $2.27 | $1,135.00 |
| 1,000 | $2.02 | $2,020.00 |
PIC18LF2221-I/SS 概述
Background: An 8-bit microcontroller (MCU) is a small, self-contained computer on a single IC that integrates a CPU, non-volatile program memory (Flash), working RAM, data EEPROM, and peripherals such as timers, ADC, and serial ports. Within the broader taxonomy, an MCU belongs to microcontrollers -> embedded processors -> integrated circuits -> semiconductors. The PIC18 family uses Microchip's enhanced Harvard RISC architecture with 77 single-word instructions and an 8-level hardware stack, offering deterministic interrupt response and a low learning curve for new firmware developers.
The PIC18LF2221-I/SS exposes up to 25 digital I/O pins, a 10-bit ADC with multiple channels, enhanced PWM/ECCP, USART, MSSP (SPI/I2C), and flexible oscillator options including a 31 kHz internal low-power oscillator. The combination of nanoWatt power management, low-voltage operation down to 2.0 V, and a generous peripheral set makes it well suited to battery-powered and space-constrained designs.
Typical applications include consumer appliances, sensor signal conditioning, low-cost motor control, USB/HID human-interface devices, industrial telemetry, and small-scale IoT nodes. The wide voltage range simplifies designs that must accept both 2xAA alkaline and 3.3 V regulated rails.
When designing with this part, remember to budget for the ICSP/ICD pins and add a decoupling capacitor pair (100 nF + bulk) close to VDD/AVDD/VSS. Pull MCLRE high or low per the application to select the correct reset mode. The 'I' suffix indicates the industrial -40C to +85C temperature grade.
This page synthesizes verified distributor stock, parametric comparisons against PIC18F-family alternatives, and practical design notes not collected in any single datasheet revision.
直接替换替代料： PIC18LF2221-I/SS ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18LF2221-I/SS （相同外形与封装尺寸） ——差异在于 Package, ADC, I/O Pins, Operating Temperature, Program Memory (Flash).
快速对比工具——选择替代料号进行并排对比：
PIC18F2221-I/SS
✅ 直接替换✓ 有现货
$2.79 / 个
查看数据手册 →PIC18LF2221-I/SP
✅ 直接替换✓ 有现货
$2.78 / 个
查看数据手册 →PIC18LF2221-I/ML
✅ 直接替换✓ 有现货
$1.4 / 个
查看数据手册 →PIC18LF2220-I/SS
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF1320T-I/SS
✅ 直接替换✓ 有现货
$3.65 / 个
查看数据手册 →PIC18LF1220-I/SS
✅ 直接替换✓ 有现货
$0.81 / 个
查看数据手册 →PIC18LF2221-I/SS 最大额定值与电气特性
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 4 KB (2K x 16) |
| Data SRAM | 512 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, multiple channels |
| PWM / ECCP | Yes (Enhanced CCP) |
| USART | 1 |
| MSSP (SPI / I2C) | Yes |
| Timers | 8-bit and 16-bit timer modules |
| 工作温度 | -40C to +85C (Industrial) |
| 封装 | SSOP-28 (208 mil) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Instruction Set | 77 single-word instructions |
| Reset/Power Management | nanoWatt technology, internal 31 kHz oscillator |
PIC18LF2221-I/SS 引脚配置
| 引脚 1 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / negative voltage reference |
| 引脚 2 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / positive voltage reference |
| 引脚 3 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 引脚 4 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| 引脚 5 | VSS — Ground reference |
| 引脚 6 | OSC1/CLKI/RA7 — Oscillator input / external clock / PORTA bit 7 |
| 引脚 7 | OSC2/CLKO/RA6 — Oscillator output / PORTA bit 6 |
| 引脚 8 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| 引脚 9 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| 引脚 10 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 output |
| 引脚 11 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 引脚 12 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 引脚 13 | RC5/SDO — PORTC bit 5 / SPI data out |
| 引脚 14 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| 引脚 15 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| 引脚 16 | VSS — Ground reference (second pin) |
| 引脚 17 | VDD — Positive supply |
| 引脚 18 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| 引脚 19 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| 引脚 20 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| 引脚 21 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate |
| 引脚 22 | RB4 — PORTB bit 4 |
| 引脚 23 | RB5/PGM — PORTB bit 5 / LVP programming |
| 引脚 24 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 引脚 25 | RB7/PGD — PORTB bit 7 / ICSP data |
| 引脚 26 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 引脚 27 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 引脚 28 | MCLR/VPP/RA5 — Reset (active low) / programming voltage / PORTA bit 5 alternate |
典型应用
PIC18LF2221-I/SS 适用于 6 应用s: Consumer Appliance Control, Battery-Powered Sensor Node, USB HID / Human-Interface Device, Low-Cost Motor Control (DC / Stepper), Industrial Telemetry / Remote Monitoring, Educational / Maker / Hobby Electronics.
Consumer Appliance Control
The PIC18LF2221-I/SS is a natural fit for consumer appliances (coffee makers, washing machines, microwaves) because its 2.0 V-5.5 V VDD range handles both rectified 5 V rails and 3.3 V sensor rails without level shifting. The 40 MHz core executes PID-style control loops in well under 1 ms per iteration, while the 10-bit ADC reads temperature, pressure, and current-sensor outputs simultaneously. With 25 I/O pins, the MCU can drive triac/relay drivers, keypads, and seven-segment or character LCDs directly, and the on-chip ECCP generates the precise zero-crossing switching waveforms that dimmer and induction-cooktop stages require. Industrial -40C to +85C operation covers behind-the-panel heat-rise conditions. The 256-byte EEPROM stores user preferences and last-state memory across power cycles, avoiding a separate non-volatile chip.
推荐
Battery-Powered Sensor Node
For 2xAA alkaline or single-cell Li-ion sensor nodes, the PIC18LF2221-I/SS gives true 2.0 V operation, preserving usable capacity all the way to brownout. nanoWatt technology drops quiescent current to the microamp range in sleep, and the internal 31 kHz oscillator eliminates an external RTC chip. The PIC18 core wakes on interrupt, samples a thermistor or load-cell through the 10-bit ADC, and transmits the reading via USART or MSSP to an external radio. The 4 KB Flash accommodates small over-the-air update bootloaders, while 256 bytes of EEPROM holds calibration constants. SSOP-28 keeps the PCB under 10x10 mm for wearable or remote-telemetry form factors.
推荐
USB HID / Human-Interface Device
The PIC18LF2221-I/SS handles USB HID class devices such as keyboards, mice, game controllers, and custom input peripherals when paired with an external USB transceiver or used with a software USB stack on PORTB. Its 10 MIPS throughput is more than enough for HID polling rates above 125 Hz, and the USART can drive a Bluetooth/Wi-Fi co-processor for wireless HID products. The 25 I/O pins read large matrix keypads (8x8) directly, and ECCP generates the PWM signal driving vibration motors or RGB backlights. Industrial temperature grade suits automotive cabin environments, and the LF voltage range lets a single design run from either a USB 5 V rail or a 3.3 V regulator downstream of a switching converter.
推荐
Low-Cost Motor Control (DC / Stepper)
For small brushed DC and unipolar/bipolar stepper drives, the PIC18LF2221-I/SS uses its ECCP module to generate precise PWM up to 40 MHz, while timers handle back-EMF and current sensing. The 10-bit ADC samples shunt-resistor voltage across H-bridges at high duty, and the 2.0 V minimum supply permits operation from a single Li-ion cell. With SSOP-28 the entire controller can fit under 100 mm square, leaving room for gate drivers and power stages on the same board. The 25 I/O pins drive enable, direction, brake, fault, and encoder signals simultaneously.
推荐
Industrial Telemetry / Remote Monitoring
Industrial telemetry units (RTUs, remote sensors, process transmitters) lean on the PIC18LF2221-I/SS for its -40C to +85C industrial range, 4 KB Flash for MODBUS or proprietary protocol stacks, and 256-byte EEPROM for parameter storage. The 10-bit ADC captures 4-20 mA current loops through a sense resistor, and the USART talks to RS-485 transceivers. nanoWatt sleep modes extend battery life in field-mounted wireless units; the internal oscillator eliminates two external crystals. The 2.0 V-5.5 V range lets a single board accept either 24 V industrial loops (post-regulation) or 3.3 V coin-cell backup.
推荐
Educational / Maker / Hobby Electronics
Hobbyists and students value the PIC18LF2221-I/SS for its MPLAB X IDE support, free XC8 compiler, and ICD/ICSP programming that lets a single tool both debug and burn Flash. The 28-pin SSOP package breaks out 25 I/O lines on a 0.65 mm pitch that hobbyists can hand-solder with fine-tip irons. Peripherals (ADC, PWM, USART, I2C/SPI) cover nearly every introductory project from blinking LEDs to I2C sensors. The LF voltage range tolerates loose benchtop wiring mistakes that pull rails below 5 V, and the 40 MHz headroom runs small RTOS kernels for advanced learners.
推荐
推荐产品汇总
工程参考数据： PIC18LF2221-I/SS ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18F2221-I/SS | PIC18LF2221-I/SP | PIC18LF2221-I/ML | PIC18LF2220-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-28 | SSOP-28 (same) | SPDIP-28 (through-hole) | QFN-28 | SSOP-28 (same) |
| Core / Architecture | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC |
| Program Memory (Flash) | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Data SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Supply Voltage | 2.0 V - 5.5 V | 4.2 V - 5.5 V (5 V only) | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V |
| I/O Pins | 25 | 25 | 25 | 25 | 25 |
| ECCP / Enhanced PWM | Yes | Yes | Yes | Yes | No (smaller pinout) |
关键差异点
- Wide 2.0 V-5.5 V VDD range supports battery-powered and 3.3 V designs （对比 PIC18F2221-I/SS)
- Surface-mount SSOP-28 footprint with 208-mil body （对比 PIC18LF2221-I/SP)
- Enhanced CCP module with full-bridge PWM support （对比 PIC18LF2220-I/SS)
- Industrial -40C to +85C temperature range standard （对比 PIC18LF1320T-I/SS)
设计说明
Estimated: At 40 MHz and 5 V VDD, the PIC18LF2221-I/SS core draws approximately 11 mA per Microchip datasheet DC characteristics. For 3.3 V operation, the figure drops to roughly 5-6 mA. Add a 100 nF ceramic decoupling cap directly across VDD/VSS (within 5 mm of the pins), plus a 10 uF bulk cap on the same rail. For noise-sensitive analog reads, a separate AVDD pin should be tied through a ferrite bead or small resistor to VDD.
Always configure CONFIG3H.LVP correctly: enabling low-voltage programming on RB5/PGM makes RB5 unavailable as general I/O, while disabling LVP frees RB5 but requires 12 V on MCLR for ICSP. The MCLR pin must be pulled high through a 10 kohm resistor; leaving it floating causes random resets. Avoid using RA0-RA3 as digital inputs when VREF+ is tied to VDD - the input buffer can latch up at VDD-0.3 V or above.
Keep the 28-pin SSOP trace length for the oscillator pins (OSC1/OSC2) under 10 mm and surround them with a ground guard ring to reduce EMI susceptibility. Place the ICSP connector footprint (PGC/PGD/MCLR/VSS/VDD) on the board edge for programming access. For QFN variants (PIC18LF2221-I/ML), connect the central thermal/exposed pad to VSS for mechanical and thermal relief; floating it is a common defect.
When driving capacitive loads from PWM outputs, place a 100 ohm series resistor within 5 mm of the pin to slow edges and reduce ringing. For I2C lines (RC3/RC4), use 4.7 kohm pull-ups at 100 kHz and 2.2 kohm at 400 kHz; pull-ups above 50 mm of trace should be checked for signal integrity with an oscilloscope. USART lines benefit from a 100 ohm series damping resistor for cable lengths above 200 mm.
合规信息
RoHS and REACH compliance confirmed per Microchip product page and distributor listings. No AEC-Q100 variant in this family - this is industrial-grade only. Halogen-free status not specified in the available data.
