PIC18LF4321-I/ML - 8KB Flash 8-bit MCU 40MHz | Microchip
Teilenummer: PIC18LF4321-I/ML ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $6.92 | $6,92 |
| 10 | $6.23 | $62,30 |
| 100 | $5.54 | $554,00 |
| 500 | $4.98 | $2.490,00 |
| 1.000 | $4.43 | $4.430,00 |
PIC18LF4321-I/ML Übersicht
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, optimized for deterministic real-time control in cost-sensitive embedded applications. Within the broader taxonomy it falls under microcontroller -> embedded processor -> semiconductor IC, and the PIC18 family specifically targets mid-range control tasks with enhanced instruction sets and C-friendly architecture. The "LF" prefix designates the extended low-voltage operating variant, while the "F" indicates Flash-based reprogrammable program memory.
Key specifications include 77 single-word instructions, 16-bit wide instructions for improved code density, an internal 31 kHz to 8 MHz oscillator, and hardware multiply support. The PIC18LF4321 supports 4.2 V to 5.5 V supply operation in LF mode (with PIC18F4321 covering the wider 2.0 V to 5.5 V range), nanoWatt Technology for sleep currents below 1 uA, and a 10-bit ADC with up to 13 input channels depending on package. The 44-QFN package supports up to 34 digital I/O pins.
The device integrates Enhanced Capture/Compare/PWM (ECCP) modules, a USART with LIN support, an MSSP module for SPI and I2C, two analog comparators, and a programmable LVD module. Its RISC architecture with hardware multiply makes it efficient for closed-loop control, sensor interfacing, and small protocol stacks.
Typical applications include industrial sensor conditioning, HVAC actuator control, low-power remote sensing nodes, USB-less human-interface appliances, and motor-control pre-drivers. The wide peripheral mix lets a single MCU handle analog sensing, PWM drive, and serial communication without external glue logic.
Design tip: when migrating between PIC18F4321 (F) and PIC18LF4321 (LF), verify the supply-rail upper bound and the brown-out reset trip points - LF parts lose operation above 5.5 V. The exposed thermal pad on the QFN must be soldered to a sufficient copper pour to meet theta_JA targets.
This page combines distributor stock, drop-in alternatives, and engineering guidance not assembled in the manufacturer datasheet alone, giving procurement and design teams a single reference for sourcing, substitution, and implementation decisions.
Drop-in-Alternativen für PIC18LF4321-I/ML – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit PIC18LF4321-I/ML (gleiche Bauform und Footprint) – abweichend in Package, ADC, Timers, Core Architecture, Operating Temperature.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
PIC18F4321-I/ML
✅ Drop-In✓ Auf Lager
$1.22 / Stück
Datenblatt ansehen →PIC18LF4320-I/ML
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF4523-I/ML
✅ Drop-In✓ Auf Lager
$4.12 / Stück
Datenblatt ansehen →PIC18F4331-I/ML
✅ Drop-In✓ Auf Lager
$5.32 / Stück
Datenblatt ansehen →PIC18F4523-I/ML
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18F4320-I/ML
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF4321-I/ML Grenzwerte & elektrische Eigenschaften
| Core Architecture | 8-bit PIC18 RISC |
| Program Memory | 8 KB (4K x 16) Flash |
| Data RAM | 512 bytes |
| Data EEPROM | 256 bytes |
| Maximale Taktfrequenz | 40 MHz |
| Performance | 10 MIPS |
| Instruction Set | 77 single-word instructions (16-bit wide) |
| Supply Voltage Range (LF) | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 13 channels |
| Timers | Multiple 8-bit and 16-bit |
| Communication | EUSART, MSSP (SPI/I2C) |
| PWM Channels | Enhanced CCP, multiple outputs |
| Gehäuse | 44-pin QFN (HVQCCN) 8x8 mm with exposed pad |
| Betriebstemperatur | -40C to +85C (Industrial) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Lead-Free | Yes |
PIC18LF4321-I/ML 44-pin qfn (hvqccn) 8x8 mm with exposed pad Pinbelegungsleitfaden
Pinbelegung für PIC18LF4321-I/ML (44-pin qfn (hvqccn) 8x8 mm with exposed pad-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für PIC18LF4321-I/ML.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
PIC18LF4321-I/ML ist geeignet für 6 Anwendungs: Industrial Sensor Conditioning and Control, Low-Power Remote Sensing Nodes, HVAC Actuator and Damper Control, Small Appliance User Interface and Control, Automotive Body and Interior Modules (Non-Safety), Educational and Prototyping Development Platforms.
Industrial Sensor Conditioning and Control
The PIC18LF4321-I/ML fits industrial sensor conditioning because it combines a 10-bit ADC with up to 13 input channels, hardware multiply for calibration math, and an industrial -40C to +85C operating range. With 8 KB Flash and 512 bytes RAM it can host linearization tables and digital filters for thermocouple, RTD, or strain-gauge front ends. The 40 MHz / 10 MIPS performance sustains 1 ms PID loops on multiple channels simultaneously. Its nanoWatt Technology idle modes drop quiescent draw below 1 uA, enabling 4-20 mA loop-powered sensor heads. Place the MCU on the 5V rail with a 100 nF decoupling cap near each VDD pin and route analog traces away from PWM outputs to preserve ADC accuracy.
Empfohlen
Low-Power Remote Sensing Nodes
The PIC18LF4321-I/ML is well suited for battery-powered remote sensor nodes because nanoWatt Technology brings sleep current below 1 uA, while 8 KB Flash and 256 bytes EEPROM let the firmware store configuration and calibration persistently across deep-sleep cycles. The integrated EUSART and MSSP support SPI/I2C sensors and low-power radio modules like the MRF24J40. At a 1% duty cycle with periodic wake-and-transmit, average current stays under 50 uA, giving multi-year life on two AA cells. Use the MSSP in I2C mode to interface digital temperature, humidity, and pressure sensors, and the 10-bit ADC for battery voltage monitoring. Select the internal 31 kHz LF oscillator during sleep and switch to the 8 MHz HF oscillator only for active measurements.
Empfohlen
HVAC Actuator and Damper Control
The PIC18LF4321-I/ML drives HVAC actuators and dampers using its Enhanced CCP module to generate complementary PWM outputs with programmable dead-band, which prevents shoot-through in half-bridge motor and valve drivers. Its 10-bit ADC samples thermistor or 0-10 V feedback, while the EUSART links to a building automation bus. The industrial temperature grade supports rooftop and basement equipment enclosures, and the 5V supply range simplifies integration with legacy HVAC control boards. With 77 single-word instructions and hardware multiply, the 4321 executes PID loops for variable-air-volume boxes in well under 1 ms. Provide a 10 uF bulk capacitor at the motor-driver supply and keep PWM traces short to limit EMI.
Empfohlen
Small Appliance User Interface and Control
The PIC18LF4321-I/ML powers small appliance user interfaces by scanning up to 8x5 matrix keypads, driving character LCDs via I2C with the MSSP, and controlling triac-fired heaters or universal motors via the Enhanced CCP PWM. Its 8 KB Flash accommodates menu state machines plus fault-logging EEPROM storage (256 bytes). The 4.2 V to 5.5 V supply works directly off rectified mains-derived 5V rails. With 34 I/O pins the MCU replaces dedicated UI controllers while also serving as the main system MCU. Add zero-cross detection to the CCP capture input for triac phase-angle control and use the analog comparators for overcurrent shutdown.
Empfohlen
Automotive Body and Interior Modules (Non-Safety)
The PIC18LF4321-I/ML is used in non-safety automotive body modules such as mirror adjusters, interior lighting controllers, and seat-position memories. The 5V supply range aligns with body-electronics rails, and the Enhanced CCP module produces the PWM signals needed for LED dimming and small motor drive. The 256-byte EEPROM stores seat-position presets without battery backup. For AEC-Q100 qualified body-electronics designs, choose the automotive-graded PIC18F4321-I/ML variant instead. Add ESD protection (TVS diodes) on connector pins and isolate the MCU analog ground from the load-drive ground.
Empfohlen
Educational and Prototyping Development Platforms
The PIC18LF4321-I/ML serves as an educational platform in universities and maker labs because of its balanced mix of peripherals (ADC, PWM, EUSART, MSSP, ECCP) and free Microchip toolchain (MPLAB X IDE plus XC8 compiler). Students learn C programming, interrupt-driven design, and peripheral configuration on a single chip with 8 KB Flash for moderately sized assignments. The 44-QFN package, however, is challenging for hand-soldering; pair the MCU with a QFN-to-DIP carrier board for breadboard prototyping. The PICkit 3 or PICkit 4 programmer/debugger provides in-circuit debugging for student projects.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für PIC18LF4321-I/ML – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | PIC18F4321-I/ML | PIC18LF4320-I/ML | PIC18LF4523-I/ML | PIC18F4331-I/ML | PIC18F4523-I/ML | PIC18F4320-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (HVQCCN) 8x8 mm | 44-QFN (HVQCCN) 8x8 mm - same | 44-QFN (HVQCCN) 8x8 mm - same | 44-QFN (HVQCCN) 8x8 mm - same | 44-QFN (HVQCCN) 8x8 mm - same | 44-QFN (HVQCCN) 8x8 mm - same | 44-QFN (HVQCCN) 8x8 mm - same |
| Program Memory | 8 KB Flash | 8 KB Flash | 8 KB Flash | 16 KB Flash | 8 KB Flash | 16 KB Flash | 8 KB Flash |
| Data RAM | 512 bytes | 512 bytes | 512 bytes | 768 bytes | 512 bytes | 768 bytes | 512 bytes |
| Supply Voltage | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 4.2 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 Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| ADC | 10-bit, up to 13 channels | 10-bit, up to 13 channels | 10-bit, up to 13 channels | 12-bit ADC | 12-bit ADC | 12-bit ADC | 10-bit, up to 13 channels |
| Enhanced CCP / PWM | Yes (ECCP) | Yes (ECCP) | No (standard CCP) | Yes (ECCP) | Yes (motor-control PWM) | Yes (ECCP) | No (standard CCP) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Wichtigste Unterscheidungsmerkmale
- Extended low-voltage 4.2V-5.5V LF specification (vs. PIC18F4321-I/ML (2.0V-5.5V))
- Enhanced CCP module for advanced PWM (vs. PIC18LF4320-I/ML)
- Balanced 8 KB Flash / 512 RAM for moderate code size (vs. PIC18LF4523-I/ML (16 KB Flash / 768 RAM))
- Standard 10-bit ADC sufficient for most sensor readings (vs. PIC18F4331-I/ML (12-bit ADC + 3 op-amps))
Designhinweise
Estimated: at 40 MHz and 5.0 V the PIC18LF4321 typically draws 12-15 mA active and below 1 uA in Sleep. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VDDCORE pin and a 10 uF bulk capacitor at the regulator output. The LF variant requires VDD stay within 4.2 V to 5.5 V - brown-out resets are configured in CONFIG2L for safe thresholds.
The 44-pin QFN (HVQCCN) package dissipates heat primarily through the exposed thermal pad. Solder the EP to a copper pour of at least 1 square inch to keep theta_JA below 30 C/W. In enclosed industrial enclosures above 60 C ambient, derate clock frequency to 32 MHz or provide forced-air cooling. Estimated junction temperature at 25 C ambient, 40 MHz: below 35 C rise.
Route the analog ADC inputs (AN0-AN12) away from PWM and switching traces. Use a separate analog ground island joined to the digital ground at a single point near the MCU GND pin. The 44-QFN pad layout uses a 0.5 mm pitch and 8x8 mm body; refer to Microchip package drawing C04-188 for land pattern dimensions.
Common pitfalls include: (1) forgetting to disable the WDT in CONFIG2H when unused, which causes unintended resets; (2) configuring the LFINTOSC without trimming the TUN<5:0> register, which can leave the clock 5-10% off; (3) using the F-variant firmware voltage thresholds on an LF part, causing brown-out at 5V rails; (4) leaving the MCLR pin floating - always pull MCLR high through a 10 kohm resistor.
Keep the 40 MHz crystal traces (OSC1/OSC2) shorter than 10 mm and symmetric. Use guard traces grounded on both sides for EMI-sensitive designs. Place the ICSP programming header (PGD/PGC) at the board edge so the PICkit can connect without removing the enclosure. Reserve area for a 2-pin SOT-23 footprint in case of future crystal-to-internal-oscillator migration.
Compliance-Informationen
RoHS and lead-free compliance per Microchip product page. Industrial -40C to +85C grade; not AEC-Q100 qualified (choose automotive variant for AEC-Q).
