PIC18LF45J50-I/PT - 8-bit USB MCU, 32KB Flash, 44-TQFP | Microchip
MPN: PIC18LF45J50-I/PT ✓ Hoạt độngPIC18LF45J50-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces on a single die. PIC microcontrollers use a Harvard RISC architecture with separate program and data buses, which allows the CPU to fetch an instruction and a data operand in the same cycle. The PIC18 family extends the baseline PIC16 instruction set with C-friendly addressing, a hardware multiplier, and 16-bit instruction words, positioning PIC18LF45J50-I/PT inside the broader hierarchy of 8-bit MCU -> PIC microcontroller -> Microchip MCU portfolio -> embedded computing platform.
Key features include 32 KB self-programmable Flash, 3.8 KB RAM, full-speed USB 2.0 with on-chip transceiver, 13-channel 10-bit ADC, two analog comparators, two UART/SPI/I2C modules, and nanoWatt XLP deep-sleep modes. The device supports 34 digital I/O pins, 2 CCP modules, and an Enhanced Capture/Compare/PWM peripheral for motor and lighting control. Real-Time Clock/Calendar with software-calibrated 32 kHz source is also integrated.
Architecturally, the PIC18LF45J50-I/PT pairs the standard PIC18 pipeline with a wide operating voltage range, an internal 31 kHz to 8 MHz oscillator block, and a 4x PLL to reach 48 MHz. The on-chip USB SIE handles full-speed and low-speed signaling without an external PHY, while nanoWatt XLP technology gates unused peripherals to achieve the 13 nA sleep figure, which is critical for battery-powered USB peripherals.
Typical applications include USB HID peripherals (keyboards, mice, joysticks), battery-powered sensors, industrial data loggers, USB-to-UART bridges, and low-power embedded control nodes. The wide temperature range (-40C to +85C industrial grade) also suits factory automation modules and consumer-electronics accessories.
When designing with this part, place the 12 MHz external crystal or use the internal 8 MHz HFINTOSC with 4x PLL close to the OSC pins, keep D+/D- trace lengths matched within 50 mil, and follow Microchip's "PIC18F46J50 Family Data Sheet" guidelines for USB-IF compliance testing.
This page synthesizes distributor pricing, same-family drop-in alternatives, USB design notes, and a 44-pin TQFP pinout diagram that are not co-located on any single manufacturer or distributor page.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF45J50-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 PIC18LF45J50-I/PT (cùng hình factor và footprint) — khác nhau ở Package, ADC, Core, Timers, USB.
PIC18LF45J50T-I/PT
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PIC18F45J50-I/PT
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PIC18LF46J50-I/PT
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PIC18LF44J50-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F45J50T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF46J50T-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF45J50-I/PT Tỷ lệ tối đa & tính chất điện
| Core | PIC18 (8-bit Harvard RISC) |
| Family | PIC18 J-series XLP nanoWatt |
| Program Memory | 32 KB Flash |
| Data RAM | 3.8 KB |
| Max CPU Speed | 48 MHz (12 MIPS) |
| Điện áp cung cấp | 2.0 V to 3.6 V |
| Deep-Sleep Current | 13 nA typical (nanoWatt XLP) |
| USB | USB 2.0 Full-Speed / Low-Speed, on-chip transceiver |
| Digital I/O Pins | 34 |
| ADC | 13-channel, 10-bit |
| Comparators | 2 analog comparators |
| Timers | Timer0/1/2/3 + 2 CCP + ECCP |
| Communication | 2x EUSART, 2x MSSP (SPI/I2C) |
| Hộp | 44-pin TQFP (PT) 10x10 mm |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF45J50-I/PT
| Chân 1 | /MCLR/RE3 — Master Clear (reset) input, or digital input RE3 |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Chân 6 | RA4/AN4/T0CKI — PORTA bit 4 / analog input 4 / Timer0 clock |
| Chân 7 | RA5/AN5/SS1 — PORTA bit 5 / analog input 5 / SPI1 slave-select |
| Chân 8 | RE0/RD — PORTE bit 0 / Parallel Slave Port read control |
| Chân 9 | RE1/WR — PORTE bit 1 / Parallel Slave Port write control |
| Chân 10 | RE2/CS — PORTE bit 2 / Parallel Slave Port chip-select |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | VSS — Ground |
| Chân 13 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input |
| Chân 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 PWM output |
| Chân 18 | RC3/SCK1/SCL1 — PORTC bit 3 / SPI1 clock / I2C1 clock |
| Chân 19 | RC4/D-/VM — PORTC bit 4 / USB D- / external USB monitor input |
| Chân 20 | RC5/D+/VP — PORTC bit 5 / USB D+ / external USB monitor input |
| Chân 21 | RC6/TX1/CK1 — PORTC bit 6 / EUSART1 TX / EUSART1 clock |
| Chân 22 | RC7/RX1/DT1 — PORTC bit 7 / EUSART1 RX / EUSART1 data |
| Chân 23 | RB0/AN12 — PORTB bit 0 / analog input 12 / interrupt-on-change |
| Chân 24 | RB1/AN10 — PORTB bit 1 / analog input 10 / interrupt-on-change |
| Chân 25 | RB2/AN8 — PORTB bit 2 / analog input 8 / interrupt-on-change |
| Chân 26 | RB3/AN9 — PORTB bit 3 / analog input 9 / interrupt-on-change |
| Chân 27 | RB4/AN11 — PORTB bit 4 / analog input 11 / interrupt-on-change |
| Chân 28 | RB5/AN13 — PORTB bit 5 / analog input 13 / interrupt-on-change |
| Chân 29 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 30 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 31 | VUSB — USB internal transceiver supply (3.3 V regulated output) |
| Chân 32 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port data bit 0 |
| Chân 33 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port data bit 1 |
| Chân 34 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port data bit 2 |
| Chân 35 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port data bit 3 |
| Chân 36 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port data bit 4 |
| Chân 37 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port data bit 5 |
| Chân 38 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port data bit 6 |
| Chân 39 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port data bit 7 |
| Chân 40 | VSS — Ground |
| Chân 41 | VDD — Positive supply voltage |
| Chân 42 | ENVREG — Internal voltage regulator enable (tie to VDD for 3.3 V USB) |
| Chân 43 | VCAP — Internal regulator output filter capacitor |
| Chân 44 | RF7/SS2 — PORTF bit 7 / SPI2 slave-select |
Ứng dụng tiêu biểu
PIC18LF45J50-I/PT phù hợp cho 6 Áp dụngs: USB HID Peripherals (Keyboard, Mouse, Joystick), USB-to-UART Bridge Module, Battery-Powered Sensor Data Logger, Industrial USB Sensor Hub, USB-Connected Audio Control Surface, Low-Cost USB Bootloader Host Probe.
USB HID Peripherals (Keyboard, Mouse, Joystick)
The PIC18LF45J50-I/PT is a near-ideal core for USB Human Interface Devices thanks to its on-chip USB 2.0 full-speed transceiver and 12 MIPS CPU. A typical HID keyboard uses 12 KB to 18 KB of Flash for the HID report descriptors plus class driver, well within the 32 KB available; the 48 MHz clock yields the 1 ms USB polling interval with comfortable timing margin. The 13 nA deep-sleep current allows battery-powered wireless keyboard dongles to last multiple years on a coin cell. Pair the MCU with an external 2.4 GHz radio (e.g., nRF24L01) and an EEPROM HID descriptor store for a complete HID solution.
Được đề xuất
USB-to-UART Bridge Module
The PIC18LF45J50-I/PT's integrated USB transceiver and dual EUSART make it an excellent CDC-class USB-to-UART bridge, replacing FTDI FT232R solutions at lower BOM cost. Operating at 48 MHz, the device achieves 921600 bps UART throughput with no flow-control overrun thanks to the on-chip 16-byte hardware FIFO. The wide 2.0 V to 3.6 V supply matches industrial 3.3 V logic rails without level shifters. Use Microchip's CDC bootloader to allow field firmware upgrades over USB without an external programmer.
Được đề xuất
Battery-Powered Sensor Data Logger
The PIC18LF45J50-I/PT's nanoWatt XLP technology with 13 nA deep-sleep current enables multi-year battery operation in remote sensor data loggers. The 13-channel 10-bit ADC directly digitizes analog sensors without an external ADC, while 3.8 KB RAM buffers samples between USB service intervals. The on-chip RTCC with software-calibrated 32 kHz source timestamps each measurement. Typical use case: deploy a logger reading temperature, humidity, and battery voltage, then service once per year by retrieving over USB.
Được đề xuất
Industrial USB Sensor Hub
In factory automation, the PIC18LF45J50-I/PT aggregates multiple serial sensors and exposes them to a host PC over USB. Two EUSARTs plus two MSSP (SPI/I2C) channels allow connection of up to four sensor buses simultaneously, while the 48 MHz CPU sustains USB full-speed traffic and sensor polling concurrently. The -40 C to +85 C industrial temperature range satisfies factory-floor environments. The 44-pin TQFP package supports standard IPC-9701 SMT reflow profiles.
Được đề xuất
USB-Connected Audio Control Surface
Hobbyist and prosumer audio mixers can use the PIC18LF45J50-I/PT as a USB-HID knob-and-slider controller, sending MIDI Control Change or HID Volume messages. The PWM + ECCP module drives LED VU meters and indicator brightness; the 13-channel ADC reads potentiometer and fader positions. 32 KB Flash holds USB-MIDI stack plus custom HID descriptor logic. Compared with the PIC16F1455, this part provides more headroom for software-driven user interfaces.
Được đề xuất
Low-Cost USB Bootloader Host Probe
Field engineers use the PIC18LF45J50-I/PT as a USB-host-capable firmware-update dongle for legacy PIC targets. By implementing Microchip's AN1310 HID bootloader, the MCU streams new HEX files to target MCUs over USB and triggers a reset for self-programming. The 34 digital I/O pins drive status LEDs and target RESET/DTR lines. Wide 2.0 V to 3.6 V supply allows the dongle to be powered from any USB-A port without external regulation concerns.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF45J50-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 | PIC18LF45J50T-I/PT | PIC18F45J50-I/PT | PIC18LF46J50-I/PT | PIC18LF44J50-I/PT | PIC18F45J50T-I/PT | PIC18LF46J50T-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (PT) 10x10 mm | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Core | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC |
| Flash Memory | 32 KB | 32 KB | 32 KB | 64 KB | 16 KB | 32 KB | 64 KB |
| Data RAM | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB |
| Max CPU Speed | 48 MHz (12 MIPS) | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| USB | USB 2.0 Full/Low-Speed | USB 2.0 Full/Low-Speed | USB 2.0 Full/Low-Speed | USB 2.0 Full/Low-Speed | USB 2.0 Full/Low-Speed | USB 2.0 Full/Low-Speed | USB 2.0 Full/Low-Speed |
| Supply Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| Deep-Sleep Current | 13 nA | 13 nA | 13 nA | 13 nA | 13 nA | 13 nA | 13 nA |
| Digital I/O | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
Bảo phân biệt quan trọng
- On-chip USB 2.0 full-speed transceiver eliminates external PHY cost (vsPIC16F877A-I/P)
- nanoWatt XLP deep-sleep current of 13 nA extends coin-cell battery life by years (vsPIC18F2550-I/SP)
- Drop-in upgrade path to 64 KB Flash without PCB redesign (vsPIC18LF45J10-I/PT)
Ghi chú thiết kế
USB-IF compliance requires matched 90 ohm differential impedance on the D+/D- pair and a 15 kohm pull-down resistor on each line, per USB 2.0 specification section 6.2. According to Microchip's PIC18F46J50 family datasheet, the trace length mismatch between D+ and D- must stay below 4 mm. Place the VUSB 0.1 uF bypass capacitor within 3 mm of pin 31 and the VCAP 10 uF capacitor within 5 mm of pin 43 to ensure regulator stability. A common-mode choke (e.g., ACM2012) is recommended near the USB connector for EMI compliance.
Estimated: at 48 MHz CPU + active USB + 5 mA peripheral load, the PIC18LF45J50-I/PT draws approximately 25 mA typical. To maximize battery life, set the CPU to IDLE via the SLEEP instruction between USB SOF interrupts and use the RTCC + WDT wake source to achieve the 13 nA deep-sleep figure. Decouple VDD pins 11 and 41 individually with 100 nF ceramic capacitors and a bulk 10 uF aluminum-polymer capacitor to handle USB inrush current at hot-plug events.
Do not leave the ENVREG pin (pin 42) floating; tie it to VDD to enable the internal 3.3 V regulator that supplies the USB transceiver. Forgetting this is the most common reason for USB enumeration failure on first prototypes. Also, the ICSP pins RB6/PGD (pin 29) and RB7/PGC (pin 30) must not be pulled low at power-up to avoid entering programming mode unintentionally. Use 4.7 kohm pull-ups to VDD on these pins, and add a series 100 ohm resistor on each to the ICSP header for in-circuit programming protection.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product page and DigiKey compliance data. Not AEC-Q100 qualified - for automotive USB applications, choose PIC18F46J50 or other AEC-Q100-qualified Microchip variants.