PIC18LF45K50-I/PT - 32KB Flash 8-bit XLP MCU 44-TQFP | Microchip
MPN: PIC18LF45K50-I/PT ✓ Hoạt độngPIC18LF45K50-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, Flash program memory, and peripherals into one package. Within the broader taxonomy, the PIC18LF45K50 sits in the PIC18 enhanced mid-range family of Microchip's 8-bit PIC® RISC architecture, which provides up to 16 MIPS throughput at 48 MHz. The eXLP nanoWatt technology adds multiple low-power sleep modes (down to sub-uA standby), brown-out reset, and ultra-low-power RTCC, making the device suitable for battery-powered and energy-harvesting designs.
Key specifications include 32 KB Flash, 2 KB SRAM, 256 B EEPROM, 35 digital I/O pins, and rich connectivity: full-speed USB 2.0 (device/host/OTG), two USART modules, one SPI, and one I²C. The integrated 10-bit ADC with up to 25 channels and multiple timer/capture/PWM modules support mixed-signal embedded designs. The 44-TQFP package exposes 35 I/O lines plus dedicated USB D+/D- pins, supporting designs that need USB without an external transceiver.
Architecturally, the PIC18LF45K50 uses a 16-bit instruction word with 8-bit data path, hardware multiplier, and an 8-level hardware stack. The core supports both C and assembly development under MPLAB X IDE with the XC8 compiler, and is in-circuit serial programmable (ICSP) via two pins, enabling field firmware updates. The XLP nanoWatt features include low-power RTC, deep sleep with RAM retention, and ultra-low-power wake-on-interrupt.
Typical applications include USB HID peripherals (keyboards, mice, custom HID), battery-powered sensor nodes with USB charging, consumer electronics with USB-C interfaces, industrial data loggers with USB connectivity, and educational/development boards. The 1.8V minimum supply enables direct Li-ion or two-AA battery operation. The device also integrates a charge time measurement unit (CTMU) for capacitive touch and a 5-bit DAC for analog trimming.
When designing with the PIC18LF45K50, ensure the supply stays within 1.8V-3.6V for the LF variant; do not exceed 3.6V. Provide a 20 MHz crystal or use the internal 16 MHz HFINTOSC for USB full-speed operation, because USB requires a 48 MHz clock derived from the PLL. Decouple VDD with 100 nF ceramic at every supply pin and route the D+/D- pair as a 90-ohm differential.
This page synthesizes distributor pricing as of 2026-09-29, drop-in same-family PIC18LF alternatives from the Microchip catalogue, and practical USB + low-power design notes not compiled in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF45K50-I/PT — 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 PIC18LF45K50-I/PT (cùng hình factor và footprint) — khác nhau ở Package, ADC, Timers, Operating Temperature, Core.
PIC18F45K50-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF45K50-I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF45K50-E/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF45J50-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F45K50-E/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF45K50-I/PT Tỷ lệ tối đa & tính chất điện
| Core Processor | PIC |
| Core Size | 8-bit |
| Core Family | PIC18F XLP |
| Maximum CPU Speed | 48 MHz (16 MIPS) |
| Program Memory Type | Flash |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 2 KB |
| EEPROM Size | 256 B |
| Supply Voltage (LF) | 1.8 V to 3.6 V |
| Number of I/O Pins | 35 |
| Hộp | 44-pin TQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Connectivity | USB 2.0 FS (Device/Host/OTG), 2x USART, SPI, I2C |
| Peripherals | 10-bit ADC up to 25 ch, 8/16-bit Timers, PWM, CTMU, HLVD, BOR, WDT |
| Data Converters | 10-bit ADC, 5-bit DAC |
| Oscillator | Internal 16 MHz HFINTOSC + PLL to 48 MHz; external crystal supported |
| Program Memory | 32 KB |
| Cấp MSL | 3 (168 hours) |
| Lead-Free / RoHS | Yes / Compliant |
Cấu hình chân PIC18LF45K50-I/PT
| 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 / VREF+ |
| Chân 6 | RA4 — PORTA bit 4 |
| Chân 7 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| Chân 8 | RE0/AN5 — PORTE bit 0 / analog input 5 |
| Chân 9 | RE1/AN6 — PORTE bit 1 / analog input 6 |
| Chân 10 | RE2/AN7 — PORTE bit 2 / analog input 7 |
| Chân 11 | VDD — Positive supply voltage (1.8V to 3.6V for LF) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Chân 14 | OSC2/CLKOUT — Oscillator output / clock output |
| Chân 15 | RC4/D+ — PORTC bit 4 / USB D+ |
| Chân 16 | RC5/D- — PORTC bit 5 / USB D- |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| 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 | RC0 — PORTC bit 0 |
| Chân 24 | RC1 — PORTC bit 1 |
| Chân 25 | RC2 — PORTC bit 2 |
| Chân 26 | RC3 — PORTC bit 3 |
| Chân 27 | RB0 — PORTB bit 0 |
| Chân 28 | RB1 — PORTB bit 1 |
| Chân 29 | RB2 — PORTB bit 2 |
| Chân 30 | RB3 — PORTB bit 3 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB4 — PORTB bit 4 |
| Chân 34 | RB5 — PORTB bit 5 |
| Chân 35 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 36 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 37 | RD4 — PORTD bit 4 |
| Chân 38 | RD5 — PORTD bit 5 |
| Chân 39 | RD6 — PORTD bit 6 |
| Chân 40 | RD7 — PORTD bit 7 |
| Chân 41 | RA6 — PORTA bit 6 |
| Chân 42 | RA7 — PORTA bit 7 |
| Chân 43 | RE3 — PORTE bit 3 |
| Chân 44 | VUSB — USB internal 3.3V regulator output |
Ứng dụng tiêu biểu
PIC18LF45K50-I/PT phù hợp cho 6 Áp dụngs: USB HID Peripherals, Battery-Powered Sensor Nodes, USB-C Charging Cradles and Docks, Industrial Data Loggers with USB, Consumer Electronics with USB-C, Educational Development Boards.
USB HID Peripherals
The PIC18LF45K50-I/PT is purpose-built for USB Human Interface Device peripherals such as keyboards, mice, game controllers, and custom HID gadgets. Its integrated full-speed USB 2.0 controller with on-chip transceiver eliminates the need for an external USB bridge, saving BOM cost and PCB area. The 32 KB Flash easily fits HID report descriptors and device firmware, while the 2 KB SRAM hosts USB endpoint buffers plus application stack. Designers get free USB stacks from Microchip's MLA library and benefit from 1.8V-3.6V operation enabling direct Li-ion or 2xAA battery power. Typical implementation routes D+/D- as a 90-ohm differential pair and uses internal 3.3V USB pull-ups.
Được đề xuất
Battery-Powered Sensor Nodes
The XLP nanoWatt technology makes the PIC18LF45K50-I/PT ideal for battery-powered sensor nodes that spend most of their life in deep sleep. Sleep currents below 1 uA with RAM retention extend coin-cell or 2xAA battery life to multiple years. The 10-bit ADC with up to 25 channels digitizes sensor inputs, while I2C/SPI communicate with external digital sensors. The 1.8V minimum supply lets the device run directly from a single Li-ion cell without a boost converter. Combined with brown-out reset and ultra-low-power wake-on-interrupt, the part enables remote environmental monitoring, asset trackers, and IoT edge nodes where mains power is unavailable.
Được đề xuất
USB-C Charging Cradles and Docks
USB Type-C charging cradles use the PIC18LF45K50-I/PT's USB peripheral for cable orientation detection and basic device enumeration. With 1.8V-3.6V operation, the MCU can power directly from VBUS after a 3.3V LDO, simplifying the power tree. The 16 MIPS throughput handles USB stack plus charging state machine in firmware, while PWM outputs drive LED status indicators. CTMU peripheral enables touch-button interfaces for the cradle surface. Combined with internal EEPROM for storing calibration data and 35 GPIO for accessory control pins, the K50 is a one-chip solution for low-cost charging docks that need USB awareness without full USB-PD complexity.
Được đề xuất
Industrial Data Loggers with USB
Industrial data loggers benefit from the PIC18LF45K50-I/PT's combination of 32 KB Flash for buffer storage, 256 B EEPROM for non-volatile configuration, USB for data retrieval, and industrial -40C to +85C temperature grade. The 10-bit ADC with 25 channels accepts 4-20 mA or 0-10V transducer signals through external signal conditioning, while 2x USART interfaces accept RS-232/RS-485 transceivers for field-bus connectivity. The XLP low-power modes enable battery-backed operation during power outages. Industrial engineers value the on-chip USB because it eliminates the BOM cost of external FTDI bridges - logs are exported by plugging into any PC.
Được đề xuất
Consumer Electronics with USB-C
Consumer products like smart-home hubs, fitness wearables with charging cradles, and educational STEM kits use the PIC18LF45K50-I/PT for USB-C connectivity at minimal cost. The 1.8V minimum supply enables single-cell Li-ion operation, while the 5 mm x 5 mm TQFP footprint fits compact consumer enclosures. Flash-resident USB HID or CDC stacks allow the device to appear as a keyboard, mouse, or virtual COM port without driver installation on most operating systems. The 32 KB Flash comfortably hosts application logic plus USB descriptors, and CTMU enables low-cost capacitive touch buttons for the device surface.
Được đề xuất
Educational Development Boards
The PIC18LF45K50-I/PT is a popular choice for low-cost educational development boards thanks to integrated USB, free Microchip MPLAB X IDE + XC8 compiler toolchain, and a generous peripheral set at sub-$5 pricing. Universities and makers use it to teach embedded C programming, USB stack development, ADC sampling, PWM motor control, and I2C/SPI peripheral interfacing. The 44-TQFP package is breadboard-compatible through carrier boards, and ICSP allows firmware updates without removing the chip. Hobbyists value the extensive Microchip application notes, community libraries, and the ability to migrate code to higher-end PIC24/dsPIC parts without learning a new architecture.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF45K50-I/PT — 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 | PIC18F45K50-I/PT | PIC18LF45K50-E/PT | PIC18LF45J50-I/PT | PIC18F45K50-E/PT | PIC18LF45K50-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 40-PDIP (different) |
| Supply Voltage Range | 1.8V to 3.6V | 1.8V to 5.5V | 1.8V to 3.6V | 2.0V to 3.6V | 1.8V to 5.5V | 1.8V to 3.6V |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM Size | 2 KB | 2 KB | 2 KB | 3.8 KB | 2 KB | 2 KB |
| USB Peripheral | USB 2.0 FS Device/Host/OTG | USB 2.0 FS | USB 2.0 FS | No USB | USB 2.0 FS | USB 2.0 FS |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +85C |
| Max CPU Frequency | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) |
Bảo phân biệt quan trọng
- Lowest voltage range (1.8V) in K50 family (vsPIC18F45K50-I/PT)
- Integrated USB 2.0 full-speed controller (vsPIC18LF45J50-I/PT)
- Industrial -40C to +85C temperature grade as standard (vsPIC18F45K50-E/PT)
Ghi chú thiết kế
The PIC18LF45K50-I/PT operates from 1.8V to 3.6V VDD. Provide 100 nF ceramic decoupling on VDD pins 11 and 32, plus a 10 uF bulk capacitor near the supply. Estimated: at 48 MHz active current is approximately 12 mA; in deep sleep with RTCC, current drops below 1 uA per datasheet. Do NOT exceed 3.6V on the LF variant - use PIC18F45K50 for 5V systems. USB VBUS can be connected to VUSB (pin 44) via a 10 uF capacitor to power the internal 3.3V USB regulator.
USB differential pair D+ (pin 15) and D- (pin 16) must be routed as a 90-ohm differential pair with characteristic impedance matched per USB 2.0 spec. Place a 15 kohm pull-down on D- for full-speed device detection; the PIC18LF45K50 integrates this pull-up internally on D+. Keep the differential pair length matched within 150 mil. For USB-IF compliance, add common-mode choke and ESD protection array near the USB connector. Estimated: typical USB signal eye opening remains compliant with 50 mm trace lengths on FR-4 with proper impedance control.
Three pitfalls to avoid: (1) USB operation requires 48 MHz system clock - enable the PLL and configure HFINTOSC to 16 MHz as the PLL source, since internal 8 MHz is too slow. (2) Do not use the LF variant above 3.6V - electrical overstress damages the internal USB transceiver. (3) When migrating from PIC18F45K50 firmware to LF45K50, verify the BOR and HLVD voltage thresholds are within the LF supply range; default PIC18F BOR levels may be above 3.6V and trigger continuous resets on the LF part.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Industrial -40C to +85C temperature grade; AEC-Q100 qualified versions exist as PIC18F45K50-I/PT automotive variants. Lead-free and halogen-free per Microchip environmental compliance documentation.