PIC18F4321T-I/ML - 8KB Flash 8-bit MCU 40MHz QFN-44 | Microchip
MPN: PIC18F4321T-I/ML ✓ Hoạt độngPIC18F4321T-I/ML Tóm tắt
An 8-bit microcontroller (MCU) is a programmable integrated circuit that executes instructions from on-chip program memory while interacting with peripherals through digital and analog I/O pins. The PIC18F family sits above PIC16 in Microchip's 8-bit hierarchy, offering enhanced peripherals and nanoWatt power management. Architecturally, an 8-bit MCU typically includes a CPU core, Flash program memory, SRAM for data, EEPROM for non-volatile storage, timers, ADC, communication peripherals, and GPIO. PIC18F devices extend the baseline PIC16 instruction set with 16-bit instructions and a hardware multiplier for C-friendly code generation.
The PIC18F4321 features 36 digital I/O pins, a 10-bit ADC with multiple channels, multiple capture/compare/PWM modules, USART, MSSP (I2C/SPI), and nanoWatt Technology power management for sleep/idle modes. The 44-pin VQFN exposed-pad package provides a compact footprint and a thermal dissipation path for the silicon die through the EP.
This microcontroller is well suited for industrial control nodes, sensor signal conditioning, motor control, low-power battery devices, and consumer appliances where the PIC18 ecosystem of MPLAB X, XC8 compiler, and a broad library of code examples reduces time-to-market. The device is also a strong candidate for legacy PIC18F4321 designs migrating from PDIP to a smaller QFN footprint.
In designs, ensure the exposed pad is soldered to a sufficient copper pour for thermal dissipation, and follow Microchip's QFN land-pattern guidelines. The ICSP programming pins must remain accessible for in-circuit programming and debugging.
Bộ thay thế dễ dàng lắp đặt cho PIC18F4321T-I/ML — 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 PIC18F4321T-I/ML (cùng hình factor và footprint) — khác nhau ở ADC, Package, I/O Pins, Maximum CPU Speed, Operating Temperature.
PIC18F4321-I/ML
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| Family | PIC18F |
| Core | 8-bit PIC |
| Program Memory Type | Flash |
| Program Memory Size | 8 KB (4K x 16) |
| RAM Size | 512 bytes |
| EEPROM Size | 256 bytes |
| Maximum CPU Speed | 40 MHz |
| Performance | 10 MIPS |
| Instruction Execution Time | 100 ns (at 40 MHz) |
| Number of I/O Pins | 36 |
| Supply Voltage Range | 2.0 V to 5.5 V |
| ADC | 10-bit |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-pin VQFN (8x8 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F4321T-I/ML
| Chân 1 | NC — Not connected |
| Chân 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O / Analog input channel 4 / SPI slave select |
| Chân 8 | OSC1/CLKI/RA7 — Oscillator input / External clock / Digital I/O |
| Chân 9 | OSC2/CLKO/RA6 — Oscillator output / Clock out / Digital I/O |
| Chân 10 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Chân 11 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Chân 12 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Chân 13 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 14 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 15 | RC5/SDO — Digital I/O / SPI data out |
| Chân 16 | RC6/TX/CK — Digital I/O / USART TX / clock |
| Chân 17 | RC7/RX/DT — Digital I/O / USART RX / data |
| Chân 18 | VSS — Ground reference |
| Chân 19 | VDD — Positive supply voltage 2.0V to 5.5V |
| Chân 20 | RB0/INT0/FLT0 — Digital I/O / External interrupt 0 / PWM fault |
| Chân 21 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Chân 22 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Chân 23 | RB3/INT3/CCP2 — Digital I/O / External interrupt 3 / CCP2 |
| Chân 24 | RB4/KBI0 — Digital I/O / Keyboard interrupt 0 |
| Chân 25 | RB5/KBI1 — Digital I/O / Keyboard interrupt 1 |
| Chân 26 | RB6/KBI2/PGC — Digital I/O / Keyboard interrupt 2 / ICSP clock |
| Chân 27 | RB7/KBI3/PGD — Digital I/O / Keyboard interrupt 3 / ICSP data |
| Chân 28 | MCLR/VPP/RE3 — Master clear reset / Programming voltage / Digital I/O |
| Chân 29 | RD0 — Digital I/O |
| Chân 30 | RD1 — Digital I/O |
| Chân 31 | RD2 — Digital I/O |
| Chân 32 | RD3 — Digital I/O |
| Chân 33 | RD4 — Digital I/O |
| Chân 34 | RD5 — Digital I/O |
| Chân 35 | RD6 — Digital I/O |
| Chân 36 | RD7 — Digital I/O |
| Chân 37 | VSS — Ground reference |
| Chân 38 | VDD — Positive supply voltage |
| Chân 39 | RE0/RD — Digital I/O |
| Chân 40 | RE1/WR — Digital I/O |
| Chân 41 | RE2/CS — Digital I/O |
| Chân 42 | AVDD — Analog supply voltage |
| Chân 43 | AVSS — Analog ground reference |
| Chân 44 | EP — Exposed pad - thermal dissipation, solder to ground plane |
Ứng dụng tiêu biểu
PIC18F4321T-I/ML phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Node, Battery-Powered Remote Control / IoT Edge Node, Consumer Appliance Control Board, Automotive Aftermarket Accessory (Non-Safety), Educational and Maker Embedded Platform, Motor Drive and PWM Control.
Industrial Sensor Interface Node
The PIC18F4321T-I/ML fits industrial sensor nodes because of its 36 digital I/O pins, 10-bit ADC, and nanoWatt Technology sleep modes. Place the QFN on a board with a copper pour tied to the exposed pad to dissipate heat from the industrial -40C to +85C operating range; the 10 MIPS CPU can sample multiple analog sensors and run a Modbus RTU stack over the USART. Compared with discrete op-amp + ADC chains, this MCU integrates all conversion and signal conditioning in a single 8x8 mm package.
Được đề xuất
Battery-Powered Remote Control / IoT Edge Node
The PIC18F4321T-I/ML's nanoWatt Technology enables Sleep currents in the microampere range, allowing battery-powered IoT edge nodes to run for years on a single coin cell. The 8KB Flash comfortably fits MQTT-SN, BLE beacon drivers, or LoRaWAN stack fragments; the 512B RAM supports small buffers. Operating from 2.0V to 5.5V, it accepts direct battery input without an LDO. Designers should exploit the MSSP (I2C/SPI) ports to attach sensors and the USART for host-side debug.
Được đề xuất
Consumer Appliance Control Board
The PIC18F4321T-I/ML integrates 36 I/O lines plus USART and MSSP, making it suitable for white-goods, HVAC, and kitchen-appliance control boards. The 8KB Flash stores the appliance state machine and user-interface firmware; the 256B EEPROM retains settings across power cycles. Its 40 MHz / 10 MIPS throughput handles triac-zero-crossing control, keypad scanning, and sensor fusion in real time, while the 5V operation directly drives relay and triac interfaces.
Được đề xuất
Automotive Aftermarket Accessory (Non-Safety)
The PIC18F4321T-I/ML's industrial -40C to +85C range covers cabin and non-safety automotive accessory conditions. The 36 I/O lines and 10-bit ADC support dashboard lighting controllers, mirror controllers, and body-electronics accessories; the MSSP interfaces with SPI/I2C peripherals. Note that AEC-Q100 is not qualified, so it cannot replace safety-critical components, but it is fully appropriate for non-safety accessories.
Được đề xuất
Educational and Maker Embedded Platform
The PIC18F4321T-I/ML is popular in academic labs and maker projects because of the free MPLAB X IDE, XC8 compiler, and PICkit programmer support. With 36 I/O lines, students can drive LEDs, character LCDs, servo motors, and UART peripherals from a single chip. The 44-pin QFN footprint teaches surface-mount soldering skills, while ICSP enables in-circuit debugging and step-through learning.
Được đề xuất
Motor Drive and PWM Control
The PIC18F4321T-I/ML's Capture/Compare/PWM (CCP) modules and enhanced 16-bit timers generate precise PWM signals for DC motor speed control and brushless-DC commutation. The 10 MIPS throughput executes field-oriented control loops at modest RPMs, and the 36 I/O lines drive gate-driver enable signals. The industrial -40C to +85C temperature range supports enclosed motor housings; pair the QFN exposed pad with a copper pour for thermal relief.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F4321T-I/ML — 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 | PIC18F4321-I/ML | PIC18F4320T-I/PT | PIC18F4320-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin VQFN (8x8) with EP | 44-pin VQFN (8x8) with EP | 44-pin TQFP | 44-pin TQFP |
| Program Memory | 8 KB Flash | 8 KB Flash | 8 KB Flash | 8 KB Flash |
| RAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| Maximum CPU Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Number of I/O Pins | 36 | 36 | 36 | 36 |
| Supply Voltage Range | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C |
| Packaging Media | Tape & Reel | Tray | Tape & Reel | Tray |
Bảo phân biệt quan trọng
- Industrial -40C to +85C temperature range in compact QFN-44 (vsPIC18F4320T-I/PT)
- Same die and pinout, tape-and-reel packaging optimized for high-volume assembly (vsPIC18F4321-I/ML)
- Established PIC18 ecosystem with 8KB Flash and nanoWatt technology (vsPIC18F4221T-I/ML)
Ghi chú thiết kế
The PIC18F4321T-I/ML's 44-pin VQFN exposed pad must be soldered to a copper pour for both electrical ground and thermal dissipation. At 40 MHz worst-case operation in industrial temperature, the device stays within junction ratings with a 1-2 square inch copper pour. For high ambient temperature environments, increase the pour area or add thermal vias to inner planes.
Use Microchip's recommended QFN-44 land pattern. Keep digital traces short, place decoupling capacitors (100 nF + 10 uF) within 5 mm of each VDD pin, and route the AVSS/AVDD pair separately from digital VDD/VSS to minimize ADC noise coupling. The exposed pad should connect to the ground plane through at least 4 thermal vias.
Route the ICSP PGC/PGD lines away from switching nodes and noisy power traces to ensure reliable in-circuit programming. Place an RC filter on MCLR if the system has long MCLR traces. Group the USART TX/RX differential-style routing together, and isolate the analog AVSS/AVDD pins from noisy digital traces to preserve ADC accuracy.
Do not exceed 5.5V on any VDD or digital I/O pin; the PIC18F4321 is not 5V-tolerant when powered at 3.3V. Always honor the brown-out-reset voltage settings in CONFIG to ensure clean reset behavior. The ADC's acquisition time depends on the source impedance - add a buffer for high-impedance sensors.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C; not AEC-Q100 qualified for automotive safety applications. Lead-free (Pb-free) reflow profile per Microchip datasheet.
