PIC18LF2321T-I/SO - 8KB Flash 40MHz 8-bit MCU | Microchip
MPN: PIC18LF2321T-I/SO ✓ Hoạt độngPIC18LF2321T-I/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, peripherals, and I/O. Within the broader taxonomy, the PIC18LF2321 belongs to the 8-bit microcontroller family, which sits under the wider category of microcontrollers (MCU) within the embedded computing hierarchy: 8-bit MCU -> 16-bit MCU -> 32-bit MCU -> microprocessor -> embedded processor -> semiconductor. PIC18 devices are the mid-tier Microchip family, upgradeable from PIC16 and migration-targetable to PIC24 / dsPIC for higher performance, while remaining pin-compatible in many footprints.
Key features include nanoWatt Technology with multiple power-managed operating modes (RUN, IDLE, SLEEP), a 10-bit ADC with up to 13 channels, two analog comparators, one Enhanced USART (EUSART) supporting RS-232/RS-485 and LIN, one MSSP port configurable for SPI or I2C (master/slave), two 8-bit timers plus three 16-bit timers, and a 10-bit PWM module with up to four channels. The device is upwards compatible with PIC16C5X, PIC12CXXX, PIC16CXX, and PIC17CXX code, providing a software migration path to existing designs.
Typical applications include industrial sensor nodes, white-goods and appliance control panels, automotive body and comfort modules (non-safety), battery-powered handheld instruments, USB-to-UART bridges, and low-cost user-interface boards requiring capacitive touch via the mTouch peripheral. When designing with this MCU, ensure the MCLR pull-up, ICSP clock and data lines, and the Vcap bulk-decoupling capacitor are routed per Microchip PIC18F2321 datasheet guidelines; the LF variant tolerates the wide 2.0-5.5 V supply but requires Vdd rise to be monotonic for proper brown-out reset behavior. This page consolidates distributor pricing, drop-in SOIC-28 alternatives, and practical design notes that complement the Microchip datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF2321T-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 PIC18LF2321T-I/SO (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Timers, ADC, Operating Temperature.
PIC18LF2321-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2321T-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2320T-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2320T-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF2420-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF2321T-I/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit) |
| Program Memory Size | 8 KB (4K x 16) Flash |
| RAM Size | 512 bytes |
| EEPROM Size | 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, up to 13 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| PWM Channels | Up to 4 (10-bit) |
| Communication | 1 x EUSART (LIN/RS-485), 1 x MSSP (SPI/I2C) |
| Analog Comparators | 2 |
| Hộp | 28-pin SOIC (7.50 mm / 0.295 inch wide) |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Instruction Set | 77 single-word instructions |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC18LF2321T-I/SO
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input or programming voltage / PORTE bit 3 |
| 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 negative reference |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC positive reference |
| Chân 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock input / comparator 1 output |
| Chân 7 | RA5/AN4/SS/HLVDIN/C2OUT — PORTA bit 5 / analog input 4 / SPI slave select / HLVD input / comparator 2 output |
| Chân 8 | GND — Ground reference |
| Chân 9 | OSC1/CLKI/RA7 — External oscillator input / PORTA bit 7 |
| Chân 10 | OSC2/CLKO/RA6 — External oscillator output / PORTA bit 6 |
| Chân 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM / capture/compare |
| Chân 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / EUSART TX / clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / EUSART RX / data |
| Chân 19 | GND — Ground reference |
| Chân 20 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Chân 21 | RB0/AN12/INT0 — PORTB bit 0 / analog input 12 / external interrupt 0 |
| Chân 22 | RB1/AN10/INT1 — PORTB bit 1 / analog input 10 / external interrupt 1 |
| Chân 23 | RB2/AN8/INT2 — PORTB bit 2 / analog input 8 / external interrupt 2 |
| Chân 24 | RB3/AN9/CCP2A — PORTB bit 3 / analog input 9 / CCP2 alternate output |
| Chân 25 | RB4/AN11/KBI0 — PORTB bit 4 / analog input 11 / interrupt-on-change 0 |
| Chân 26 | RB5/KBI1/PGM — PORTB bit 5 / interrupt-on-change 1 / LVP programming |
| Chân 27 | RB6/KBI2/PGC — PORTB bit 6 / interrupt-on-change 2 / ICSP clock |
| Chân 28 | RB7/KBI3/PGD — PORTB bit 7 / interrupt-on-change 3 / ICSP data |
Ứng dụng tiêu biểu
PIC18LF2321T-I/SO phù hợp cho 6 Áp dụngs: Industrial Sensor Node (4-20 mA / 0-10 V), White-Goods / Appliance Control Board, Automotive LIN Slave Node, Battery-Powered Handheld Instrument, User Interface Board (LED + Keys + Buzzer), USB-to-UART Bridge / Programming Adapter.
Industrial Sensor Node (4-20 mA / 0-10 V)
Why fit: The PIC18LF2321T-I/SO's 10-bit ADC with up to 13 input channels, 2.0-5.5 V LF supply, and 25 I/O make it a natural fit for low-cost analog sensor conditioning and digital I/O aggregation nodes. Specifically, the ADC's 10-bit resolution and the EUSART/MSSP peripherals allow direct bridge-amp readout followed by RS-485 or I2C bus transmission without external glue logic. The 2.0 V minimum Vdd lets the board run directly from a 2-cell AA battery with a boost converter, simplifying the analog front-end supply. How used: The MCU sits between the sensor bridge/conditioning stage and the isolated comms transceiver, sampling at typically 100 Hz to 1 kHz and forwarding measurements via MODBUS-RTU over RS-485. Trade-off: A discrete op-amp plus MCU ADC achieves roughly 12-bit effective resolution (with oversampling), versus a 24-bit dedicated sigma-delta ADC; the PIC18 solution is dramatically cheaper but has higher noise floor.
Được đề xuất
White-Goods / Appliance Control Board
Why fit: The 28-pin SOIC footprint, 25 I/O, four 10-bit PWM channels, and 2.0-5.5 V LF supply make the PIC18LF2321T-I/SO well-suited to washing machines, dishwashers, microwave ovens, and induction cooktop HMI boards. Specifically, the EUSART enables touch-panel or HMI link, while multiple timers support triac zero-crossing and motor RPM feedback. The wide 2.0-5.5 V supply means the part tolerates rectified 5 V rail droop during relay switching transients. How used: The MCU runs the user-interface state machine, drives LED indicators via PWM, and times triac firing on a 50/60 Hz mains half-cycle; brown-out and watchdog timers handle fault recovery. Trade-off: The PIC18 is 8-bit; for complex GUIs the PIC32 or Cortex-M0+ is more capable, but for simple knob-and-button panels the 18LF2321 is cost-optimal.
Được đề xuất
Automotive LIN Slave Node
Why fit: The Enhanced USART (EUSART) supports LIN 1.3 / 2.0 with auto-baud and break-detect, and the LF variant's 2.0-5.5 V range tolerates 12 V automotive battery cranking transients when powered via an external regulator. The PIC18LF2321T-I/SO's 25 I/O and ADC are sufficient for body-comfort modules such as seat controllers, mirror adjusters, or window-lift switches. Industrial -40C to +85C rating covers most passenger-compartment locations; under-hood applications should use the Q-grade AEC-Q100 variant instead. How used: The MCU implements a LIN 2.0 slave stack, drives relay / FET outputs for the comfort function, and reads switch inputs via interrupt-on-change, all on a 28-SOIC board. Trade-off: For ASIL-B/C safety systems the PIC18 is insufficient; designers must use the PIC18 K-series with CAN or a dedicated safety MCU.
Được đề xuất
Battery-Powered Handheld Instrument
Why fit: The PIC18LF2321T-I/SO's nanoWatt Technology with multiple low-power modes and the LF supply (2.0 V to 5.5 V) make it suitable for handheld DMMs, environmental loggers, and BLE-bridged sensor pens that run on 2 x AA / 1 x CR2032 cells. Sleep currents in the microamp range enable 1+ year battery life if the CPU wakes only on a button press or 1 Hz timer. The MSSP-based I2C interface works seamlessly with popular low-power ADCs and sensors. How used: The MCU performs peak-and-hold ADC reads, drives a low-power LCD via segmented I/O, and forwards data over a UART-BLE bridge. Trade-off: A dedicated low-power Cortex-M0+ may offer lower deep-sleep current, but the PIC18's strong interrupt-driven I/O set and Microchip MPLAB X toolchain shorten firmware development.
Được đề xuất
User Interface Board (LED + Keys + Buzzer)
Why fit: 25 I/O plus 4 PWM channels on the PIC18LF2321T-I/SO support up to 25 LEDs or 12 matrix-scan keys plus a buzzer tone, all on the 28-SOIC package. The 10-bit ADC can be shared with a small resistive touch strip via the mTouch sensor-impedance measurement technique, enabling cost-sensitive touch UI without dedicated touch ICs. How used: The MCU scans the key matrix on a 1 ms timer, drives PWM LED dimming, and emits key events over I2C to a host controller. Trade-off: For larger displays (TFT) the PIC18 architecture is undersized; use the PIC32 or a Cortex-M4 with integrated display controller.
Được đề xuất
USB-to-UART Bridge / Programming Adapter
Why fit: The PIC18LF2321T-I/SO's EUSART and MSSP together with the 2.0-5.5 V LF supply make it suitable as a low-cost USB-to-UART or USB-to-I2C/SPI bridge when paired with a USB stack loader. The 8 KB Flash fits a basic CDC-ACM UART bridge plus a HID channel for bootloading. How used: The MCU implements a CDC-class USB-UART bridge, optionally exposes an I2C/SPI tunnel command set, and uses only a 28-SOIC part on the daughter board. Trade-off: For higher throughput (>=1 Mbaud) or full-speed USB with multi-endpoint support use the PIC18F14K50 or PIC18F46K40 family instead, which have native USB-OTG peripherals.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF2321T-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/SO | PIC18F2321T-I/SO | PIC18LF2320T-I/SO | PIC18F2320T-I/SO | PIC18LF2420-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Supply Voltage | 2.0 V to 5.5 V (LF) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) |
| Flash Memory | 8 KB | 8 KB | 8 KB | 4 KB | 4 KB | 16 KB |
| RAM | 512 bytes | 512 bytes | 512 bytes | 256 bytes | 256 bytes | 768 bytes |
| Maximum CPU Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 25 | 25 | 25 | 25 | 25 | 25 |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Industrial Temp Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- Wide 2.0 V to 5.5 V LF supply range for battery and 3.3 V systems (vsPIC18F2321T-I/SO)
- Migration headroom with same SOIC-28 footprint (vsPIC18LF2420-I/SO)
- Identical package to lower-memory sibling for cost optimization (vsPIC18LF2320T-I/SO)
Ghi chú thiết kế
Vdd must be monotonic on rising edge to guarantee correct POR and Brown-Out Reset (BOR) behavior; add a 100 nF decoupling cap close to pin 20 and a bulk 1 uF to 10 uF cap within 1 cm. The LF process allows 2.0 V minimum, so on a 2 x AA cell, allow for cold-start at 2.0 V with the CPU at full 40 MHz - this is the lowest worst-case voltage and the MCU is still within spec. Add a reverse-protection diode and a TVS to extend battery lifetime against accidental reverse polarity.
Place a 100 nF X7R decoupling capacitor between Vdd (pin 20) and GND (pin 19) within 2 mm of the package. Route the MCLR pull-up resistor (typically 10 kOhm to Vdd) close to pin 1 with no high-current traces running underneath, since MCLR is sensitive to injected noise that can cause spurious resets. Provide an in-circuit serial programming (ICSP) connector with PGC (pin 27) and PGD (pin 28) accessible without removing the MCU from the board; this allows field firmware updates using the Microchip MPLAB ICD or PICkit.
Route the analog AVdd and AVss pins (shared with Vdd/GND) through a ferrite bead or 10 Ohm resistor to isolate digital switching noise from the analog reference used by the 10-bit ADC. Place the VREF+ bypass capacitor (typically 0.1 uF to 1 uF ceramic) directly at the AN3/VREF+ pin when used in external-reference mode. Keep ADC traces away from PWM and EUSART switching lines to minimize coupling; the LF variant has slightly higher ADC noise floor at high frequency so averaging or oversampling may be required for 10-bit ENOB at full speed.
Do not confuse the LF (2.0-5.5 V) and F (4.2-5.5 V) variants when ordering - the prefix letter controls the supply range and dropping a non-LF into a 3.3 V design will silently fail to start. Configuration bits (CONFIG1H) must explicitly select the oscillator mode (HS, XT, RC, INTOSC); if they are left blank, the device may boot from an unexpected oscillator source. The EUSART auto-baud feature requires a 'sync' character at the start of each frame; failure to send it causes one-frame receive errors during LIN diagnostics.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product page. LF and F PIC18F2321 variants are not AEC-Q100 qualified; for automotive LIN nodes requiring AEC-Q100, use the PIC18F25K80 / PIC18F27K40 Q-grade variants.
