PIC18LF2321-I/SO - 8KB Flash 8-bit MCU 40MHz SOIC-28 | Microchip
MPN: PIC18LF2321-I/SO ✓ Hoạt độngPIC18LF2321-I/SO Tóm tắt
What is a microcontroller? A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (Flash/ROM), working memory (RAM), and on-chip peripherals such as timers, ADC, communication interfaces, and I/O ports. Within the broader semiconductor taxonomy, an MCU sits inside the embedded IC category, below the hypernym integrated circuit (IC). Microchip's PIC18 family adds enhanced 16-bit instruction width and a hardware multiplier to the legacy PIC16 8-bit core, doubling throughput while preserving upward code compatibility from PIC16C5X, PIC12CXXX, PIC16CXX and PIC17CXX designs.
Key features include ten MIPS peak performance at 40 MHz, 77 single-word instructions, a 16-bit instruction word, hardware multiplier (8x8 in one cycle), ICD/ICSP in-circuit debugging and programming, 256 bytes of EEPROM data storage, 10-bit ADC, USART, MSSP (SPI/I2C), Capture/Compare/PWM modules, and nanoWatt XLP sleep modes. The 28-pin wide SOIC provides ease of hand-soldering and breadboard-friendly development while the LF voltage range (down to 2.0 V) supports two-AA cell, single Li-ion, or USB-powered designs.
Architecture-wise the PIC18LF2321 uses a Harvard RISC core with separate program and data buses, 32 levels of hardware stack, and a vectored interrupt controller supporting both legacy and prioritized interrupt modes. The flash program memory supports self-programming under firmware control, enabling bootloaders and field-upgradable devices.
Typical applications include consumer appliances, sensor conditioning front-ends, low-power remote controls, HVAC controls, USB-to-UART bridges, low-end digital photo frames, industrial sensor nodes, and small appliances with LED/LCD user interfaces. The PIC18F2321 (non-LF) version is also drop-in compatible, enabling easy migration to 5 V-only designs.
Design consideration: when migrating firmware from PIC16 to PIC18, port the configuration bits and review the interrupt priority scheme; PIC18 adds a two-level priority mode that must be enabled before use.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet to speed your sourcing decision.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF2321-I/SO — 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 PIC18LF2321-I/SO (cùng hình factor và footprint) — khác nhau ở Package, Communication, ADC, Operating Temperature, Core Architecture.
PIC18LF2321-I/SP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2321-I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F2321-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2320-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF2221-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2421-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2321-I/SO Tỷ lệ tối đa & tính chất điện
| Family | PIC18LF23xx |
| Core | PIC 8-bit RISC |
| Instruction Set | 77 single-word instructions, 16-bit instruction width |
| Program Memory | 8 KB Flash (4K x 16) |
| SRAM | 512 bytes |
| 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, 9 channels |
| Timers | 4 (Timer0/1/2/3) |
| Communication | EUSART, MSSP (SPI / I2C) |
| Capture/Compare/PWM | 1 ECCP + 2 CCP |
| Hộp | 28-pin SOIC (7.50 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Lead-Free / RoHS | Yes, RoHS compliant |
| Cấp MSL | 1 (unlimited floor life) |
| On-Chip Debug | ICSP / ICD support |
| Power-Saving Mode | nanoWatt XLP (multiple sleep modes) |
Cấu hình chân PIC18LF2321-I/SO
| Chân 1 | RA0/AN0 — Digital I/O / Analog input 0 |
| Chân 2 | RA1/AN1 — Digital I/O / Analog input 1 |
| Chân 3 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC negative reference |
| Chân 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| Chân 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 6 | RA5/AN4/SS — Digital I/O / Analog input 4 / SPI slave select |
| Chân 7 | RA6/OSC2 — Digital I/O / Oscillator output |
| Chân 8 | RA7/OSC1 — Digital I/O / Oscillator input |
| Chân 9 | Vss — Ground |
| Chân 10 | Vdd — Positive supply voltage (2.0-5.5V) |
| Chân 11 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Chân 12 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Chân 13 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Chân 14 | RB3/CCP2 — Digital I/O / CCP2 output |
| Chân 15 | RB4 — Digital I/O / interrupt-on-change |
| Chân 16 | RB5 — Digital I/O / interrupt-on-change / I2C SDA on PIC18LF24/25xx (not 23xx) |
| Chân 17 | RB6/PGC — Digital I/O / ICSP clock / ICD clock |
| Chân 18 | RB7/PGD — Digital I/O / ICSP data / ICD data |
| Chân 19 | Vss — Ground |
| Chân 20 | Vdd — Positive supply voltage (2.0-5.5V) |
| Chân 21 | RC0/T1OSO — Digital I/O / Timer1 oscillator output |
| Chân 22 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Chân 23 | RC2/CCP1 — Digital I/O / CCP1 output |
| Chân 24 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 25 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 26 | RC5/SDO — Digital I/O / SPI data out |
| Chân 27 | RC6/TX/CK — Digital I/O / EUSART TX / clock |
| Chân 28 | RC7/RX/DT — Digital I/O / EUSART RX / data |
Ứng dụng tiêu biểu
PIC18LF2321-I/SO phù hợp cho 6 Áp dụngs: Consumer Appliance Control Board, Battery-Powered Sensor Node, USB-to-UART Bridge Dongle, HVAC Thermostat Controller, Industrial Sensor Signal Conditioner, LED Display Driver Board.
Consumer Appliance Control Board
Why PIC18LF2321-I/SO fits: The PIC18LF2321's 10 MIPS performance, 25 I/O pins, and 2.0-5.5V wide supply range let a single chip drive relays, read keypad inputs, and pulse LED indicators in toasters, microwaves, and washing machines without a second IC. How it is used + performance consideration: One ECCP+PWM module drives a buzzer or triac at line frequency while a 10-bit ADC reads thermistor and water-level sensors; firmware fits inside 8 KB flash with self-programming left for future options. Estimated standby current in nanoWatt sleep drops to roughly 100 nA, preserving energy-star compliance on line-powered units.
Được đề xuất
Battery-Powered Sensor Node
Why PIC18LF2321-I/SO fits: The LF 2.0-5.5V supply window supports two AA cells (3.0V nominal) down to a near-end cutoff of 2.0V, extracting every joule from the battery. nanoWatt XLP sleep modes drop quiescent current to roughly 100 nA. How it is used + performance consideration: A 10-bit ADC samples a thermistor every 30 seconds; EUSART wakes up only to transmit. The 28-SOIC and 25 I/O leave room for an SPI sensor interface (MSSP) and a low-battery indicator LED while the 8 KB flash holds a small RTOS and 256-byte EEPROM stores calibration constants.
Được đề xuất
USB-to-UART Bridge Dongle
Why PIC18LF2321-I/SO fits: The integrated EUSART and MSSP peripherals provide asynchronous serial plus optional SPI, and the LF variant tolerates USB 5V VBUS through the SOIC's wide voltage range. 25 I/O pins are ample for status LEDs and RTS/CTS handshake lines. How it is used + performance consideration: Firmware implements a CDC class on the EUSART at 115200 bps with full 8 KB flash budget; the 10-bit ADC is repurposed as a VBUS voltage monitor. For designs needing native USB, PIC18LF14K50 or PIC18LF13K50 are better alternatives since this device lacks a USB peripheral.
Được đề xuất
HVAC Thermostat Controller
Why PIC18LF2321-I/SO fits: The 9-channel 10-bit ADC reads room temperature, setpoint, humidity, and indoor air-quality sensors simultaneously, while 4 timers drive a 7-day schedule and PWM output drives a triac for fan/valve control. How it is used + performance consideration: Firmware runs a PID loop at 1 Hz; the 8 KB flash holds a small menu engine for the LCD interface. Industrial -40 C to +85 C temperature rating (the -I suffix) handles attic and basement installation, and the wide SOIC allows hand rework during prototyping.
Được đề xuất
Industrial Sensor Signal Conditioner
Why PIC18LF2321-I/SO fits: The 10-bit ADC samples 4-20 mA loop inputs through a 250 ohm shunt while the EUSART streams processed values to a host PLC over RS-485 (with external transceiver). Industrial temperature grade (-40 C to +85 C) and the wide 2.0-5.5V supply tolerate plant-power environments. How it is used + performance consideration: Four timers generate precise acquisition intervals and PWM pulse widths; the MSSP SPI port interfaces to a separate ADC for high-precision applications. Estimated: with a 25 MHz CPU clock and ECCP running PWM, current draw is about 8 mA active, dropping to nanoWatt sleep between samples.
Được đề xuất
LED Display Driver Board
Why PIC18LF2321-I/SO fits: With three PWM-capable outputs (ECCP + 2 CCP) and a 10 MIPS core, the PIC18LF2321 can drive RGB LED strings at refresh rates above 100 Hz with anti-flicker dithering. The 256-byte EEPROM stores user color profiles; 25 I/O pins directly drive Charlieplex LED matrices without additional driver ICs. How it is used + performance consideration: Firmware fits in 8 KB flash with a small WS2812-like bit-banged protocol on a single MSSP/SPI line. For larger LED arrays, the PIC18LF2522 (32 KB) or PIC18F46K22 are better fits.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF2321-I/SO — 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 | PIC18LF2321-I/SP | PIC18LF2321-I/SS | PIC18F2321-I/SO | PIC18LF2320-I/SO | PIC18LF2221-I/SO | PIC18LF2421-I/SO |
|---|---|---|---|---|---|---|---|
| Package | 28-pin SOIC (7.50 mm) | 28-pin SPDIP (NOT SOIC footprint) | 28-pin SSOP (NOT SOIC footprint) | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same | 28-pin SOIC (7.50 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Program Memory | 8 KB (4K x 16) | 8 KB | 8 KB | 8 KB | 4 KB | 4 KB | 16 KB |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 1024 bytes |
| Supply Voltage (Vdd) | 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 | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Max CPU Speed | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| ADC | 10-bit, 9 channels | 10-bit, 9 ch | 10-bit, 9 ch | 10-bit, 9 ch | 10-bit, 9 ch | 10-bit, 9 ch | 10-bit, 9 ch |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- Wide 2.0-5.5 V supply range (vsPIC18F2321-I/SO)
- 8 KB flash versus 4 KB (vsPIC18LF2221-I/SO)
- On-chip 10-bit ADC with 9 channels (vsExternal ADC + PIC18LF2320)
Ghi chú thiết kế
Use the LF variant's 2.0 V Vdd minimum to power the PIC18LF2321 from two AA cells that droop below 2.7 V. Disable modules in firmware before sleep: clear ADCON0.ADON, disable comparators, and switch unused I/O to output low. nanoWatt XLP sleep current drops to roughly 100 nA per Microchip datasheet, extending battery life by orders of magnitude over active mode.
The 28-pin SOIC dissipates up to roughly 800 mW at 40 MHz with all peripherals active; in a typical 25 C ambient and natural convection the SOIC package easily handles this load without a heatsink. For sealed enclosures or above +60 C ambient, derate to 70 percent of peripherals enabled. The industrial -I temperature grade already covers -40 C to +85 C ambient operation per Microchip datasheet.
Place a 100 nF decoupling capacitor within 5 mm of each Vdd pin (there are two Vdd pins on the 28-SOIC). Add a 10 uF bulk cap near the MCU and route the MCLR pin through a 10 kohm pull-up and a 100 nF cap to ground for a hardware-reset button. Keep the 28-SOIC SOIC footprint's pad-to-pad pitch at 1.27 mm per JEDEC MS-013 to ensure hand-rework friendliness.
Route the quartz crystal traces (OSC1/OSC2 or RA6/RA7) within 10 mm of the MCU and shield them with a ground guard ring. For high-speed SPI signals (>10 MHz) match the trace length and keep series resistance under 50 ohm. Use the MSSP module's slew-rate control bits if your bus exceeds 1 MHz to reduce EMI per Microchip PIC18 datasheet recommendations.
Do not exceed 5.5 V on Vdd or 5.5 V on any I/O pin - the PIC18LF2321 lacks internal clamping on most pins. When migrating firmware from PIC16 to PIC18, ensure the configuration bits are set properly: disable watchdog unless needed, select HS or XT oscillator mode correctly, and configure the brown-out reset voltage to 4.0 V or 2.5 V per your supply. Failing to configure the LF vs F voltage range will produce undefined behavior below 4.2 V on PIC18F2321 (non-LF) parts.
Thông tin tuân thủ
RoHS compliant per Microchip product page and distributor listings. Industrial temperature grade -40 C to +85 C. Not AEC-Q100 qualified (use PIC18FxxKxx with Q suffix for automotive).
