PIC18LF2321-I/ML - 8KB Flash 8-bit MCU, 40MHz, 28-QFN | Microchip
MPN: PIC18LF2321-I/ML ✓ نشطPIC18LF2321-I/ML نظرة عامة
This device is part of the PIC microcontroller family, which is a RISC (Reduced Instruction Set Computer) architecture widely used in embedded control applications. PIC microcontrollers are 8-bit MCUs that combine Flash program memory, RAM, EEPROM, configurable digital I/O, and on-chip peripherals (ADC, timers, UART, SPI, I2C) on a single chip. They sit within the broader hierarchy of microcontrollers -> microprocessors -> ICs -> semiconductors, and are favored in industrial, automotive, consumer, and IoT applications for their deterministic performance, low power, and ease of programming through MPLAB X IDE.
The PIC18LF2321-I/ML features a 10-bit ADC with up to 28 channels (varies by package), multiple capture/compare/PWM modules, an enhanced USART, MSSP (SPI/I2C) interface, and a 25 I/O pin count in the 28-QFN package. It supports a wide operating voltage range of 2.0V to 5.5V (LF variant), making it suitable for both battery-powered and 5V regulated systems. The /ML suffix indicates the 28-pin QFN industrial temperature grade (-40C to +85C).
Architecture-wise, this device uses a 16-bit-wide instruction word with an 8-bit data path, allowing most instructions to execute in a single cycle. The integrated nanoWatt Technology provides multiple power-managed modes (Idle, Sleep, and Run) for battery-sensitive designs, while the self-reprogrammable Flash under software control enables flexible field updates.
Typical applications include industrial sensor nodes, low-power IoT edge devices, battery-powered instrumentation, HVAC control, motor control loops, USB-to-UART bridges, and consumer appliances. The combination of 8 KB Flash, 25 I/O, and integrated 10-bit ADC allows engineers to replace multiple discrete components with a single chip.
Design consideration: the exposed thermal pad on the QFN package must be soldered to the PCB ground plane for proper thermal dissipation, RF performance, and mechanical reliability. Always follow Microchip's QFN PCB layout guidelines to avoid solder joint fatigue.
This page synthesizes distributor pricing, drop-in alternative MPNs from the Microchip PIC18 family, and practical design notes not aggregated on the manufacturer product page.
بدائل مباشرة لـ PIC18LF2321-I/ML — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18LF2321-I/ML (نفس عامل الشكل والبصمة) — يختلف في Package, Operating Temperature, ADC, Core, I/O Pins.
PIC18LF2320-I/ML
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18F2321-I/ML
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF2221-I/ML
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF2220-I/ML
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF2321-I/ML الحدود القصوى والخصائص الكهربائية
| Core | PIC 8-bit RISC |
| Instruction Set Width | 16-bit |
| Program Memory (Flash) | 8 KB (4K x 16) |
| Data RAM | 512 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 28 channels |
| Communication Interfaces | EUSART, MSSP (SPI/I2C) |
| العلبة | 28-QFN (6x6 mm) with exposed pad |
| درجة حرارة التشغيل | -40C to +85C (Industrial) |
| نوع التركيب | Surface Mount |
| Power-Saving Modes | nanoWatt Technology (Idle / Sleep / Run) |
تكوين أطراف PIC18LF2321-I/ML
| دبوس 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| دبوس 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| دبوس 3 | RA2/AN2/VREF- — Digital I/O / Analog input / ADC VREF- |
| دبوس 4 | RA3/AN3/VREF+ — Digital I/O / Analog input / ADC VREF+ |
| دبوس 5 | RA4 — Digital I/O (open-drain) |
| دبوس 6 | RA5/AN4 — Digital I/O / Analog input channel 4 |
| دبوس 7 | VSS — Ground reference |
| دبوس 8 | OSC1/CLKIN — Crystal oscillator input / external clock |
| دبوس 9 | OSC2/CLKOUT — Crystal oscillator output |
| دبوس 10 | RC0 — Digital I/O / PWM output |
| دبوس 11 | RC1 — Digital I/O / PWM output |
| دبوس 12 | RC2/CCP1 — Digital I/O / Capture-Compare-PWM 1 |
| دبوس 13 | RC3 — Digital I/O / SPI/I2C clock |
| دبوس 14 | RC4 — Digital I/O / SPI/I2C data |
| دبوس 15 | RC5 — Digital I/O / SPI/I2C data |
| دبوس 16 | RC6/TX — Digital I/O / EUSART TX |
| دبوس 17 | RC7/RX — Digital I/O / EUSART RX |
| دبوس 18 | RB0/INT0 — Digital I/O / External interrupt 0 |
| دبوس 19 | RB1/INT1 — Digital I/O / External interrupt 1 |
| دبوس 20 | RB2 — Digital I/O |
| دبوس 21 | RB3 — Digital I/O |
| دبوس 22 | RB4 — Digital I/O |
| دبوس 23 | RB5 — Digital I/O |
| دبوس 24 | RB6/PGC — Digital I/O / ICSP clock |
| دبوس 25 | RB7/PGD — Digital I/O / ICSP data |
| دبوس 26 | VDD — Positive supply (2.0-5.5 V) |
| دبوس 27 | VSS — Ground reference |
| دبوس 28 | MCLR/VPP — Master clear reset (active-low) / programming voltage |
التطبيقات النموذجية
PIC18LF2321-I/ML مناسب لـ 6 التطبيقs: Industrial Sensor Hubs, Battery-Powered IoT Edge Nodes, HVAC and Building Control, Consumer Appliance Control, Motor Control and PWM Drivers, Automotive Aftermarket Accessories.
Industrial Sensor Hubs
The PIC18LF2321-I/ML fits industrial sensor hubs because its 25 I/O pins and 10-bit ADC let it aggregate multiple analog sensors (temperature, pressure, humidity) in a single chip. The 2.0-5.5 V supply range lets it run from a 24V industrial rail with a small LDO, while the 8 KB Flash holds protocol stacks for 4-20 mA loop output or Modbus framing. Its nanoWatt sleep mode drops quiescent current to the nA range between sensor reads, suiting remote solar-powered installations.
موصى به
Battery-Powered IoT Edge Nodes
The PIC18LF2321-I/ML's wide 2.0-5.5 V supply range and nanoWatt sleep technology make it a strong choice for battery-powered IoT edge nodes that wake periodically to read sensors and transmit. The 8 KB Flash accommodates lightweight wireless stacks (LoRaWAN, BLE beaconing) and the 512 B RAM is sufficient for short packet buffers. At deep sleep with RTC tick at 32 kHz, the chip draws sub-microamp current, extending coin-cell or 2x AA battery life to multiple years.
موصى به
HVAC and Building Control
The PIC18LF2321-I/ML fits HVAC and building automation controllers because its 25 I/O can drive relays, triacs, and valve actuators while the 10-bit ADC reads thermistor/resistive temperature sensors. The wide operating temperature of -40C to +85C suits unconditioned equipment closets, and the 5V tolerance integrates directly with legacy thermostat wiring. The 8 KB Flash holds proportional-integral control loops and 7-day scheduling logic for smart thermostats.
موصى به
Consumer Appliance Control
The PIC18LF2321-I/ML is well-suited to consumer appliance main-control boards (coffee machines, small kitchen appliances, washing-machine user-interface panels). Its EUSART and MSSP blocks drive character LCDs and capacitive touch controllers, while the 8 KB Flash supports user-interface state machines and safety logic. The industrial temperature grade and surface-mount QFN package meet reliability requirements for white goods.
موصى به
Motor Control and PWM Drivers
The PIC18LF2321-I/ML's enhanced CCP/ECCP modules deliver PWM outputs suitable for brushed DC and small stepper motor control in toys, small fans, and valve actuators. The 40 MHz core closes PID loops fast enough for sub-millisecond update rates, while the 25 I/O pins carry encoder feedback, limit switches, and H-bridge control signals. Pairing with Microchip's TC4469 gate driver provides robust MOSFET switching for brushed DC motors up to several amps.
موصى به
Automotive Aftermarket Accessories
The PIC18LF2321-I/ML powers automotive aftermarket accessories such as auxiliary lighting controllers, alarm-system interfaces, and OBD-II loggers. Its 2.0-5.5 V supply tolerates 12V battery cranking transients when paired with a TVS diode and LDO. The industrial temperature grade suits cabin and engine-bay installations, while the 8 KB Flash holds CAN/LIN framing libraries and diagnostic-logging routines for aftermarket telematics.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LF2321-I/ML — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18LF2320-I/ML | PIC18F2321-I/ML | PIC18LF2221-I/ML | PIC18LF2220-I/ML |
|---|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same | 28-QFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 2 KB | 2 KB |
| Operating Voltage | 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 |
| I/O Pins | 25 | 25 | 25 | 25 | 25 |
| CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
| Unit Price (qty 1, as of 2026-09-28) | $3.42 | ~$3.30 | ~$3.50 | ~$2.40 | ~$2.30 |
أبرز الفروقات
- Wider supply range than PIC18F2321-I/ML (مقابلPIC18F2321-I/ML)
- More Flash than PIC18LF2221-I/ML (مقابلPIC18LF2221-I/ML)
- Includes second analog comparator missing from PIC18LF2320-I/ML (مقابلPIC18LF2320-I/ML)
- Industrial -40C to +85C operation (مقابلPIC18F2321T-I/ML (extended temp variant))
ملاحظات التصميم
The 28-QFN exposed thermal pad must be soldered to a continuous ground copper pour on the PCB. Microchip recommends at least 16 thermal vias (0.3 mm drill, 1.0 mm pitch) connecting the pad to internal ground planes. Without proper soldering, the part's mechanical reliability drops sharply and ground return impedance for analog peripherals rises, increasing ADC noise. Always follow Microchip application note AN233 for QFN PCB layout.
Decouple VDD with a 100 nF ceramic capacitor placed within 3 mm of each VDD pin, plus a bulk 10 uF tantalum or aluminum polymer capacitor on the supply rail. For ADC accuracy, place a ferrite bead between digital and analog VDD rails when the board has switching converters nearby. The /ML suffix indicates industrial temperature range, so verify capacitor dielectric (X5R/X7R) supports -40C operation if exposed to cold environments.
Do not leave the MCLR pin floating. Tie MCLR to VDD through a 10 kohm pull-up resistor, with an optional 100 nF cap to VSS for noise immunity. Programming failures and spurious resets are almost always traceable to a missing or undersized MCLR pull-up. Also, ensure the PGC/PGD pins (RB6/RB7) are not loaded by external pull-ups that exceed 10 kohm, or ICSP programming will fail.
When using the ADC, source impedance should be below 10 kohm to avoid conversion errors caused by the Sample-and-Hold capacitor charging incompletely. Add an op-amp buffer (e.g., MCP6001) when reading high-impedance sensors. Keep analog traces short and routed over a continuous ground plane to minimize ADC noise coupling from digital I/O switching.
معلومات الامتثال
RoHS and lead-free compliance assumed for active Microchip PIC18 family parts; AEC-Q100 not applicable (industrial grade, not automotive qualified - Microchip does not publish Q100 status for this part).
