PIC18LF4321-I/P - 8-Bit MCU, 8KB Flash, 40MHz | Microchip
MPN: PIC18LF4321-I/P ✓ فعالPIC18LF4321-I/P جائزہ
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program and data memory, and programmable I/O peripherals onto one die, enabling standalone embedded control. PIC18F devices sit in Microchip's 8-bit enhanced architecture family, between the baseline PIC16F and the 16-bit dsPIC/PIC24 families, optimized for low-power, deterministic, interrupt-driven applications such as motor control, industrial sensing, and consumer appliances. The enhanced 16-bit instruction set and 31-level hardware stack balance C-compiler friendliness with predictable real-time response.
Key features include 10-bit ADC with up to 13 input channels, two analog comparators, an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), two MSSP (I²C/SPI) modules, two Capture/Compare/PWM (CCP) modules plus an Enhanced CCP for motor-control PWMs, two 8-bit timers and three 16-bit timers, and a 10-bit ADC. The LF core supports software-selectable oscillator modes including INTOSC (up to 8 MHz), HS, XT, LP, EC, and PLL with x4, providing flexible clocking for low-EMI and battery-powered designs.
Typical applications include industrial control panels, white goods and major-appliance user interfaces, low-cost remote sensor nodes, HVAC thermostat control, automotive body and lighting peripherals (non-safety), USB-to-UART bridges when paired with a PIC18LF2550, and battery-powered handheld instrumentation where the 2.0 V min supply extends usable runtime from partially-depleted cells. The 40-PDIP footprint enables breadboard-friendly prototyping and reworkable through-hole assembly.
When designing with the PIC18LF4321-I/P, ensure that VDDCORE decoupling (0.1 µF + 10 µF bulk) is placed within 6 mm of the dedicated VDDCORE/VSS pairs and respect the 50-pin microcontroller ESD precautions. Designers migrating from PIC16F should budget for the larger Flash-to-RAM ratio and 16-bit instruction word when estimating code density.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل PIC18LF4321-I/P — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC18LF4321-I/P (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف ADC, Timers, Core Architecture, Package, Mounting Type.
PIC18F4321-I/P
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC18LF4320-I/P
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4221-I/PT
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4331-I/P
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC18LF4321-I/ML
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4321-I/P زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | PIC18F (8-bit enhanced) |
| CPU Core | RISC 8-bit |
| Max CPU Speed | 40 MHz (10 MIPS) |
| Instruction Set | 77 instructions, 16-bit opcodes |
| Program Memory | 8 KB (4K × 16 words) Flash |
| SRAM | 512 bytes |
| EEPROM | 256 bytes |
| Operating Voltage Range | 2.0 V to 5.5 V (LF variant) |
| آپریٹنگ درجہ حرارت رینج | -40 °C to +85 °C (Industrial) |
| Package / Pin Count | 40-PDIP (DIP-40, through-hole) |
| ماؤنٹنگ ٹائپ | Through-Hole |
| ADC | 10-bit, multi-channel |
| Timers | 2 × 8-bit + 3 × 16-bit |
| Communication Modules | EUSART, 2 × MSSP (I²C/SPI) |
| PWM Modules | 2 × CCP + 1 × ECCP |
| Analog Comparators | 2 |
| MSL لیول | Not applicable (through-hole) |
PIC18LF4321-I/P پن کنفیگریشن
| پن 1 | RA0/AN0 — I/O port A bit 0 / analog input 0 |
| پن 2 | RA1/AN1 — I/O port A bit 1 / analog input 1 |
| پن 3 | RA2/AN2/VREF- — I/O port A bit 2 / analog input 2 / VREF- |
| پن 4 | RA3/AN3/VREF+ — I/O port A bit 3 / analog input 3 / VREF+ |
| پن 5 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| پن 6 | RA5/AN4 — I/O port A bit 5 / analog input 4 |
| پن 7 | RE0/RD/AN5 — I/O port E bit 0 / read control / analog input 5 |
| پن 8 | RE1/WR/AN6 — I/O port E bit 1 / write control / analog input 6 |
| پن 9 | RE2/CS/AN7 — I/O port E bit 2 / chip select / analog input 7 |
| پن 10 | VDD — Main power supply |
| پن 11 | VSS — Ground reference |
| پن 12 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock in |
| پن 13 | OSC2/CLKO/RA6 — Crystal oscillator output / clock out |
| پن 14 | RC0/T1OSO/T13CKI — I/O port C bit 0 / Timer1 oscillator output / Timer1 clock |
| پن 15 | RC1/T1OSI/CCP2 — I/O port C bit 1 / Timer1 oscillator input / CCP2 output |
| پن 16 | RC2/CCP1 — I/O port C bit 2 / CCP1 output |
| پن 17 | RC3/SCK/SCL — I/O port C bit 3 / SPI clock / I²C clock |
| پن 18 | RC4/SDI/SDA — I/O port C bit 4 / SPI data in / I²C data |
| پن 19 | RC5/SDO — I/O port C bit 5 / SPI data out |
| پن 20 | RC6/TX/CK — I/O port C bit 6 / EUSART TX / EUSART clock |
| پن 21 | RC7/RX/DT — I/O port C bit 7 / EUSART RX / EUSART data |
| پن 22 | RB0/INT0 — I/O port B bit 0 / external interrupt 0 |
| پن 23 | RB1/INT1 — I/O port B bit 1 / external interrupt 1 |
| پن 24 | RB2/INT2 — I/O port B bit 2 / external interrupt 2 |
| پن 25 | RB3/CCP2 — I/O port B bit 3 / CCP2 |
| پن 26 | RB4 — I/O port B bit 4 |
| پن 27 | RB5 — I/O port B bit 5 |
| پن 28 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| پن 29 | RB7/PGD — I/O port B bit 7 / ICSP data |
| پن 30 | VDD — Main power supply |
| پن 31 | VSS — Ground reference |
| پن 32 | RD0 — I/O port D bit 0 |
| پن 33 | RD1 — I/O port D bit 1 |
| پن 34 | RD2 — I/O port D bit 2 |
| پن 35 | RD3 — I/O port D bit 3 |
| پن 36 | RD4 — I/O port D bit 4 |
| پن 37 | RD5 — I/O port D bit 5 |
| پن 38 | RD6 — I/O port D bit 6 |
| پن 39 | RD7 — I/O port D bit 7 |
| پن 40 | AVDD — Analog power supply |
عام استعمالات
PIC18LF4321-I/P کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Control Panels, White Goods / Major Appliances, HVAC Thermostat Control, Battery-Powered Sensor Node, USB-to-UART Bridge Module, Automotive Body/Lighting Controller (Non-Safety).
Industrial Control Panels
The PIC18LF4321-I/P fits industrial control panels because its 2.0 V to 5.5 V supply range tolerates wide 24 V-bus-derived rails after regulation, while the 10-bit ADC with dedicated analog reference reads 4-20 mA current loop signals from field transmitters with 1 mV resolution. Two CCP modules plus ECCP drive relay coils and contactor coils directly via optocoupled transistor interfaces, and the EUSART links to RS-485 transceivers for Modbus RTU communication. The 40-PDIP package supports through-hole PCB assembly that withstands vibration in factory-floor enclosures better than surface-mount parts, and the 77-instruction RISC core plus 8 KB Flash accommodates complete PID loop and Modbus stack implementations without external memory.
تجویز کردہ
White Goods / Major Appliances
Consumer washing machines, dishwashers, and refrigerators fit the PIC18LF4321-I/P because the 8 KB Flash stores motor-control PID tables and user-interface state machines, while the ECCP generates 4-channel PWM with programmable dead-band for driving washing-machine drum or compressor BLDC motors. The 2.0 V to 5.5 V supply range and 31 kHz low-power oscillator let the MCU monitor door switches and pushbutton presses at average current below 30 µA in standby mode, extending ENERGY STAR compliance. The integrated 10-bit ADC reads thermistor divider and water-level sensors simultaneously with sample-and-hold scanning at the 40 MHz core rate, achieving a one-second ADC throughput that satisfies appliance controller response requirements.
تجویز کردہ
HVAC Thermostat Control
Wall-mounted HVAC thermostats fit the PIC18LF4321-I/P because the LF variant's 2.0 V minimum supply matches common 24 VAC transformer-derived regulated rails with extra headroom, while the 40-MIPS performance runs the PI loop at 1 Hz without CPU saturation. The integrated 10-bit ADC multiplexes four 10 kΩ NTC thermistor dividers for indoor, outdoor, supply-air, and humidity probe, while the EUSART links the controller to Wi-Fi or sub-GHz wireless module over UART for smartphone integration. The 40-PDIP through-hole format allows large-pad solder-friendly rework during field service, while the -40 °C to +85 °C industrial grade supports unheated attic enclosure environments.
تجویز کردہ
Battery-Powered Sensor Node
Wireless IoT sensor nodes operating from a single-cell Li-ion or alkaline pair fit the PIC18LF4321-I/P because the LF supply range extends usable runtime down to 2.0 V when the cell is partially depleted, and the 31 kHz INTOSC consumes only microamp current in Sleep mode while still waking the MCU on UART activity or ADC-comparator interrupt. The 8 KB Flash stores MB-connected Zigbee or LoRa register configurations and 8-bit trimmed ADC coefficients, while the 256-byte EEPROM retains calibration constants across battery replacement. The EUSART plus MSSP drives a LoRa transceiver and a SPI flash simultaneously with deterministic interrupt latency, and the 40-PDIP footprint simplifies robotic assembly on legacy through-hole sensor boards.
تجویز کردہ
USB-to-UART Bridge Module
USB-to-UART bridge modules using a PIC18LF2550 companion with the PIC18LF4321-I/P for monitoring fit the part family because the LF supply matches 3.3 V USB regulated rails and the 40-pin DIP exposes the full set of peripheral functions for serial protocol debugging. When used as a debug sink, the PIC18LF4321-I/P receives bytes from the PIC18LF2550's UART, decodes them with the EUSART DMA-style interrupt service, and reflects status on its 5 timers, while the SPI MSSP drives an SSD1306 OLED display at 4 MHz without CPU overhead. The 8 KB Flash holds small command parsers and 16-bit cyclic-redundancy-check validators for industrial UART protocols like BACnet or Modbus ASCII.
تجویز کردہ
Automotive Body/Lighting Controller (Non-Safety)
Non-safety automotive body modules such as interior lighting, mirror adjustment, and seat-position memory fit the PIC18LF4321-I/P because the industrial -40 °C to +85 °C range withstands cabin temperatures, while the LF supply operates directly from a 5 V regulated body-control rail. The ECCP provides PWM dimming for LED interior and instrument-cluster illumination, and the 10-bit ADC multiplexes photodiode sense inputs for auto-headlamp and twilight detection. The EUSART connects the module to a CAN-MCP2551 CAN bridge chip via SPI-over-MSSP at 1 Mb/s, while the 40-PDIP package is preferred for low-volume body-module prototypes sold in garages rather than OEM production lines.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC18LF4321-I/P — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC18F4321-I/P | PIC18LF4320-I/P | PIC18LF4331-I/P | PIC18LF4221-I/P | PIC18LF4321-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 44-QFN (SMD) |
| Operating Voltage Range | 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 | 2.0 V to 5.5 V |
| Max CPU Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 12-bit | 10-bit | 10-bit |
| ECCP Module | Yes (1× ECCP + 2× CCP) | Yes (1× ECCP + 2× CCP) | Yes (1× ECCP + 2× CCP) | Yes (motor-control optimized) | Yes (1× ECCP + 2× CCP) | Yes (1× ECCP + 2× CCP) |
اہم امتیازی خصوصیات
- Low-voltage 2.0 V minimum supply (بمقابلہPIC18F4321-I/P)
- Enhanced CCP module for motor control (بمقابلہPIC18F4331-I/P)
- Through-hole 40-PDIP form factor (بمقابلہPIC18LF4321-I/ML)
ڈیزائن نوٹس
Place a 0.1 µF ceramic decoupling capacitor within 6 mm of every VDD/VSS pair, plus a 10 µF bulk tantalum or aluminum-polymer capacitor on the main VDD rail. The PIC18LF4321-I/P can operate from 2.0 V to 5.5 V, so for 5 V systems use a common MCP1700 or 7805 LDO. For battery-powered 2-3 cell packs, the LF variant extends usable runtime by 30-40% versus the standard PIC18F4321, which requires 4.2 V minimum to start up.
When migrating from PIC16F to PIC18LF4321-I/P, do not assume Flash page size is identical: PIC18 uses 64-word (128-byte) Flash erase pages versus 2 KB on PIC16F1xx. Also, the configuration bits register is at address 0x300000, not at the end of Flash as on PIC16F. Always run the FRM 'Migration to PIC18F' guidelines when porting C code; firmware compiled for PIC16F873 will not directly run on PIC18F4321. The Analog Comparator CVREF reference voltage at FVR is ~1.2 V, not 2.5 V as on PIC18F older silicon revisions.
The 40-PDIP package leaves 0.1 inch pin pitch which is breadboard-friendly but requires through-hole PCB mounting. Route analog signals RA0-RA5 away from digital switching traces like RC0-RC7 (EUSART / MSSP) to minimize ADC-induced noise; add a guard ring around AVdd and place the FVR bypass cap adjacent to pin 11 (VSS). For high-impedance sensors, enable the ADC's acquisition time extension in ADCON1 to 4 Tad or higher to avoid sampling-capacitor charge sharing errors.
تعمیل کی معلومات
RoHS compliance confirmed by Microchip product page; industrial temperature rating (I-suffix) supports -40 °C to +85 °C; not AEC-Q100 qualified - for automotive safety-critical use, select PIC18F4321-I/PT automotive-grade variant instead.
