PIC18LF4539T-I/ML - 40MHz 8-Bit MCU, 24KB Flash, 44-QFN | Microchip
MPN: PIC18LF4539T-I/ML ✓ Hoạt độngPIC18LF4539T-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and a rich set of peripherals (I/O, timers, ADC, communications). Within the broader hierarchy of semiconductor devices, an MCU belongs to the family of microcontrollers, which in turn sits under integrated circuits (ICs) and the wider category of digital logic semiconductors. The PIC18 family is Microchip's mid-range 8-bit architecture offering a balance of code density, deterministic interrupt handling and peripheral integration for embedded-control applications.
Key features of the PIC18LF4539T-I/ML include 32 programmable digital I/O pins, an 8-channel 10-bit Analog-to-Digital Converter (ADC), multiple capture/compare/PWM modules, USART, MSSP (SPI/I2C), and dedicated motor-control peripherals consistent with the '4539 part number family. The integrated motor-control kernel supports single-phase induction motor drive, simplifying variable-speed fan/pump designs. The 44-QFN (8x8) package provides a low-profile, thermally efficient footprint for space-constrained boards, with an exposed thermal pad to dissipate controller dissipation.
Architecturally, the PIC18 core delivers a 16-bit instruction word with an 8-bit data path, 31-level hardware stack, hardware multiplier, and linear program memory addressing up to 2 MB. The 'LF' sub-family denotes a wide-voltage (2.0-5.5V) variant, giving design flexibility for both 3.3V and 5V rails. The device is qualified for industrial temperatures (-40C to +85C per the 'I' suffix).
Typical applications include single-phase induction motor control (fans, pumps, small appliances), industrial instrumentation, white goods and HVAC controls, sensor-signal conditioning, and general-purpose 5V/3.3V embedded systems that benefit from integrated EEPROM storage and PWM channels.
When designing with the PIC18LF4539T-I/ML, observe the 44-QFN PCB land pattern and provide adequate copper thermal relief under the exposed pad; the Flash self-programming model relies on the standard PIC18 ICSP/ICD connection on PGC/PGD for in-circuit debugging.
This page synthesizes real-time distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4539T-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 PIC18LF4539T-I/ML (cùng hình factor và footprint) — khác nhau ở Package, ADC, Operating Temperature, Core Architecture, I/O Pins.
PIC18LF4539-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4539-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4539-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4523T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4520T-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF4321-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4539T-I/ML Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit (PIC18) |
| CPU Speed (Max) | 40 MHz |
| Program Memory (Flash) | 24 KB (12K x 16) |
| Data RAM | 1408 bytes |
| EEPROM | 256 bytes |
| Programmable I/O Pins | 32 |
| ADC | 8-channel, 10-bit |
| Điện áp cung cấp | 2.0 V to 5.5 V |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-QFN (8x8 mm) with exposed thermal pad |
| Kiểu lắp đặt | Surface Mount |
| Motor Control Kernel | Single-Phase Induction Motor (per datasheet family) |
| Peripherals | USART, MSSP (SPI/I2C), CCP/PWM, Timers |
| ICSP/ICD Debug | Yes (PGC/PGD) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF4539T-I/ML
| Chân 1 | MCLR — Master Clear (Reset) input, active-low |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Chân 5 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| Chân 6 | RA4 — PORTA bit 4 (digital I/O) |
| Chân 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| Chân 8 | RE0/RD — PORTE bit 0 / Parallel port read control |
| Chân 9 | RE1/WR — PORTE bit 1 / Parallel port write control |
| Chân 10 | RE2/CS — PORTE bit 2 / Parallel port chip-select |
| Chân 11 | VDD — Positive supply (2.0-5.5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 14 | OSC2/CLKOUT — Crystal oscillator output |
| Chân 15 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| Chân 16 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 18 | RC3 — PORTC bit 3 (digital I/O) |
| Chân 19 | RD0 — PORTD bit 0 |
| Chân 20 | RD1 — PORTD bit 1 |
| Chân 21 | RD2 — PORTD bit 2 |
| Chân 22 | RD3 — PORTD bit 3 |
| Chân 23 | RC4/SDI — PORTC bit 4 / SPI data in |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX — PORTC bit 6 / USART transmit |
| Chân 26 | RC7/RX — PORTC bit 7 / USART receive |
| Chân 27 | RD4 — PORTD bit 4 |
| Chân 28 | RD5 — PORTD bit 5 |
| Chân 29 | RD6 — PORTD bit 6 |
| Chân 30 | RD7 — PORTD bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply (2.0-5.5 V) |
| Chân 33 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Chân 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Chân 35 | RB2 — PORTB bit 2 |
| Chân 36 | RB3 — PORTB bit 3 |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5 — PORTB bit 5 |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 41 | RA6 — PORTA bit 6 |
| Chân 42 | RA7 — PORTA bit 7 |
| Chân 43 | VSS — Ground reference (analog) |
| Chân 44 | AVDD — Analog positive supply |
| Chân EP | EP — Exposed thermal pad - connect to VSS/ground plane |
Ứng dụng tiêu biểu
PIC18LF4539T-I/ML phù hợp cho 6 Áp dụngs: Single-Phase Induction Motor Control, White Goods and HVAC Control Boards, Industrial Instrumentation and Sensor Hubs, Battery-Operated Portable Devices, LED Lighting and Display Drivers, General-Purpose 5V/3.3V Embedded Control.
Single-Phase Induction Motor Control
The PIC18LF4539T-I/ML is designed into single-phase induction motor drives such as small fans, pumps and appliance blowers. Its 40 MHz PIC18 core delivers 10 MIPS of deterministic throughput to execute vectored commutation and closed-loop speed control within the integrated motor-control kernel, while the 8-channel 10-bit ADC samples back-EMF and current-sense signals. The 2.0-5.5 V wide supply lets the MCU share a 3.3 V or 5 V rail with the gate-driver stage, simplifying the BOM. The 44-QFN (8x8) exposed-pad package keeps the thermal path short, suiting enclosed appliance designs where board area is constrained and PCB copper serves as the heatsink.
Được đề xuất
White Goods and HVAC Control Boards
Washing machines, dishwashers, range hoods and HVAC blowers benefit from the PIC18LF4539T-I/ML's industrial -40C to +85C temperature range and on-chip EEPROM for storing calibration and fault logs. The 32 programmable I/O pins interface directly to user keypads, LED indicators, triac drivers and NTC temperature sensors, while the CCP/PWM modules generate zero-crossing-timed phase-angle control for AC loads. Its 24 KB Flash holds the full control state machine plus a small RTOS or cooperative scheduler. The wide-voltage LF supply tolerates rectified 5 V rails common in appliance SMPS designs.
Được đề xuất
Industrial Instrumentation and Sensor Hubs
The PIC18LF4539T-I/ML serves as a low-cost sensor-conditioning hub in industrial controllers, handling 4-20 mA loops, thermistor bridges and digital sensors via SPI or I2C (MSSP). Its 8-channel 10-bit ADC supports multiple analog inputs simultaneously, while 32 I/O pins drive status LEDs, relay drivers and keypad scanning. The 24 KB Flash accommodates Modbus RTU or proprietary fieldbus stacks. The wide 2.0-5.5 V supply lets the same board run from 24 V industrial rails with a small linear post-regulator. The 44-QFN (8x8) footprint suits DIN-rail mounted backplanes where vertical clearance is limited.
Được đề xuất
Battery-Operated Portable Devices
The PIC18LF4539T-I/ML 'LF' variant's 2.0 V minimum supply enables direct operation from two alkaline cells or a single Li-ion cell across its full discharge curve. Its low-power Sleep mode (typically under 1 uA with peripherals disabled, per PIC18F family datasheets) extends runtime in handheld instruments, portable monitors and remote sensor pods. The 256-byte EEPROM preserves calibration constants across battery swaps. With 24 KB Flash, designers embed small protocol stacks or data-logging firmware without external memory. The 44-QFN (8x8) package keeps the PCB below 25 mm square for compact wearables and handheld enclosures.
Được đề xuất
LED Lighting and Display Drivers
Lighting controllers and signage panels leverage the PIC18LF4539T-I/ML's CCP/PWM channels for multi-channel dimming and color-mixing. At 40 MHz the PIC18 core generates smooth 8-bit or 10-bit PWM at high update rates with minimal CPU overhead, freeing cycles for DMX-512 or DALI protocol parsing. The wide-voltage LF supply (2.0-5.5 V) supports 3.3 V logic-level LED drivers and 5 V analog dimming interfaces. The 24 KB Flash stores lighting presets and chase-pattern macros, while 256-byte EEPROM retains user configuration across power cycles. The 44-QFN footprint fits slim LED bar PCBs.
Được đề xuất
General-Purpose 5V/3.3V Embedded Control
Beyond motor control, the PIC18LF4539T-I/ML is a versatile general-purpose MCU for products that need 32 I/O, 24 KB Flash and an 8-channel ADC. The wide-voltage supply eases migration between 5 V legacy systems and newer 3.3 V designs without changing the firmware, and the integrated EEPROM avoids an external memory chip. The USART and MSSP peripherals support legacy RS-232, SPI peripherals and I2C sensors. The 44-QFN (8x8) industrial-grade package suits products that must survive harsh factory-floor environments with limited board area.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4539T-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 | PIC18LF4539-I/ML | PIC18LF4539-I/PT | PIC18F4539-I/ML | PIC18LF4523T-I/ML | PIC18LF4520T-I/ML | PIC18LF4321-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Core | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit |
| Max CPU Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Program Memory | 24 KB | 24 KB | 24 KB | 24 KB | 32 KB | 32 KB | 8 KB |
| RAM | 1408 B | 1408 B | 1408 B | 1408 B | 1536 B | 1536 B | 512 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Programmable I/O Pins | 32 | 32 | 32 | 32 | 36 | 36 | 34 |
| ADC | 8-ch, 10-bit | 8-ch, 10-bit | 8-ch, 10-bit | 8-ch, 10-bit | 12-ch, 10-bit | 13-ch, 10-bit | 8-ch, 10-bit |
| Supply Voltage | 2.0 V to 5.5 V | 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 | 2.0 V to 5.5 V |
| Motor Control Kernel | Yes (single-phase induction) | Yes (single-phase induction) | Yes (single-phase induction) | Yes (single-phase induction) | No (general purpose) | No (general purpose) | No (general purpose) |
Bảo phân biệt quan trọng
- Integrated single-phase induction motor-control kernel (vsPIC18LF4520T-I/ML)
- Wide-voltage 2.0-5.5 V supply range for battery designs (vsPIC18F4539-I/ML)
- 24 KB Flash matches typical motor-control firmware size without external memory (vsPIC18LF4321-I/ML)
- Industrial -40 C to +85 C temperature range for harsh environments (vsPIC18LF4439T-I/ML (different pin map))
Ghi chú thiết kế
The 44-QFN (8x8) package exposes a center thermal pad that MUST be soldered to a ground-copper pour with multiple thermal vias to keep junction temperature within the -40 C to +85 C industrial range. Estimated: at full 40 MHz CPU activity with all peripherals enabled and VDD=5 V, the PIC18LF4539T-I/ML consumes approximately 25 mA (125 mW). On a 1 sq-in. copper area the device stays well below the 85 C ambient ceiling; without the exposed-pad solder joint the junction can exceed ratings in enclosed appliances. Always stencil the EP with solder paste per JEDEC QFN profile recommendations.
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pin pair (the device has three VDD/VSS pairs plus a separate AVDD). Add a bulk 10 uF tantalum or ceramic cap on the main VDD rail. The MCLR pin requires a 10 kohm pull-up to VDD; if ICD is used, route PGC (RB6) and PGD (RB7) with short, parallel traces and avoid running noisy motor-drive traces adjacent to keep in-circuit debugging stable.
AVDD must be filtered through a ferrite bead or 10 ohm resistor from VDD, with a 10 uF + 100 nF cap stack right at the AVDD pin. This protects the ADC result register from digital switching noise on VDD. For motor-control designs where back-EMF signals share the analog rail, add a small RC low-pass (1 kohm + 100 nF) on each ANx input to attenuate PWM-edge ringing. Configure unused I/O pins as outputs to minimize Sleep-mode current draw.
Do not assume the PIC18F4539 (4.2-5.5 V) is interchangeable with the PIC18LF4539 (2.0-5.5 V) at 3.3 V operation - the F variant will fail to start. Verify the ordering code suffix ('LF' vs no 'L') before placing the part. Also, the 44-QFN land pattern differs from 44-QFP footprints; do not substitute a TQFP-44 footprint. Finally, when migrating from PIC18LF4523T-I/ML to PIC18LF4539T-I/ML check that the motor-control pin assignments match - the 4523 lacks the dedicated motor kernel pins.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product page and distributor listings; industrial (-40C to +85C) temperature grade, not AEC-Q100 qualified (use automotive-grade PIC parts for vehicle applications).
