PIC18LF45J11T-I/PT - 8-bit MCU, 32KB Flash, 4KB RAM | Microchip
MPN: PIC18LF45J11T-I/PT ✓ Hoạt độngPIC18LF45J11T-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a programmable system-on-chip that integrates a CPU, Flash program memory, SRAM data memory, peripherals and I/O on a single die. PIC18 LF J11 series parts add nanoWatt Technology power management (multiple idle/sleep modes) and a full-speed USB 2.0 full-speed peripheral on the J11 die revision, extending the classic PIC18 family hierarchy (PIC10/12/16/18) into connected embedded nodes.
Key features include 34 I/O pins, internal 31 kHz to 8 MHz oscillator with PLL, 10-bit ADC up to 13 channels, two USARTs, two MSSP (SPI/I2C) ports, and nanoWatt power-saving modes that drop typical run currents below 1 mA/MHz. Program memory is self-programmable under firmware control, enabling in-application upgrades.
The LF (low-voltage) silicon supports 2.0V to 5.5V operation across -40C to +85C industrial temperature range, making the part a drop-in lower-power sibling of the F-version PIC18F45J11 (2.0V-3.6V-only). The TQFP-44 footprint supports hand-solderable prototyping and standard 0.8 mm-pitch PCB assembly.
Typical applications include USB peripherals (HID, CDC), low-power sensor nodes, industrial control, consumer electronics, and battery-powered instrumentation where nanoWatt idle currents and USB connectivity matter.
When designing, ensure the 5.5V VDDMAX is respected under USB bus-powered transient conditions, and add bulk decoupling per the PIC18 LF J11 family datasheet.
This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering guidance not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF45J11T-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 PIC18LF45J11T-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, ADC, Core, Program Memory (Flash).
PIC18LF46J11-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF45J10-I/PT
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Xem tài liệu →PIC18LF45J10-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF45J11T-I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit Harvard, RISC-like) |
| Program Memory (Flash) | 32 KB |
| Data Memory (SRAM) | 4 KB |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| Hộp | TQFP-44 (PT), 10 x 10 mm |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| ADC | 10-bit, up to 13 channels |
| Communication Interfaces | USB 2.0 Full-Speed, 2x USART, 2x MSSP (SPI/I2C) |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep variants) |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Lead-free (PT suffix per Microchip convention); Halogen-free status not specified in retrieved data |
Cấu hình chân PIC18LF45J11T-I/PT
| Chân 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 3 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC negative reference |
| Chân 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| Chân 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 6 | RA5/AN4 — Digital I/O / Analog input 4 |
| Chân 7 | RA6 — Digital I/O |
| Chân 8 | RA7 — Digital I/O |
| Chân 9 | VSS — Ground reference |
| Chân 10 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Chân 11 | RB0/AN12 — Digital I/O / Analog input 12 |
| Chân 12 | RB1/AN10 — Digital I/O / Analog input 10 |
| Chân 13 | RB2/AN8 — Digital I/O / Analog input 8 |
| Chân 14 | RB3/AN9 — Digital I/O / Analog input 9 / I2C SDA (MSSP1) |
| Chân 15 | RB4/AN11 — Digital I/O / Analog input 11 |
| Chân 16 | RB5/AN13 — Digital I/O / Analog input 13 / I2C SCL (MSSP1) |
| Chân 17 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 18 | RB7/PGD — Digital I/O / ICSP data |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Chân 21 | RC0 — Digital I/O |
| Chân 22 | RC1 — Digital I/O |
| Chân 23 | RC2 — Digital I/O |
| Chân 24 | RC3 — Digital I/O |
| Chân 25 | RC4/D- — Digital I/O / USB D- |
| Chân 26 | RC5/D+ — Digital I/O / USB D+ |
| Chân 27 | RC6 — Digital I/O / USART1 TX |
| Chân 28 | RC7 — Digital I/O / USART1 RX |
| Chân 29 | VSS — Ground reference |
| Chân 30 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Chân 31 | RD0 — Digital I/O |
| Chân 32 | RD1 — Digital I/O |
| Chân 33 | RD2 — Digital I/O |
| Chân 34 | RD3 — Digital I/O |
| Chân 35 | RD4 — Digital I/O |
| Chân 36 | RD5 — Digital I/O |
| Chân 37 | RD6 — Digital I/O |
| Chân 38 | RD7 — Digital I/O |
| Chân 39 | VSS — Ground reference |
| Chân 40 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Chân 41 | RE0/RD — Digital I/O / Parallel-port read strobe |
| Chân 42 | RE1/WR — Digital I/O / Parallel-port write strobe |
| Chân 43 | RE2/CS — Digital I/O / Parallel-port chip select |
| Chân 44 | MCLR/RE3 — Master Clear reset (active low) / Digital I/O RE3 |
Ứng dụng tiêu biểu
PIC18LF45J11T-I/PT phù hợp cho 6 Áp dụngs: USB HID Peripheral Devices, USB CDC Virtual COM Port Bridges, Low-Power Sensor Node with USB Diagnostics, Industrial Control Front Panels, Consumer Appliance Control Boards, Test and Measurement Dongles.
USB HID Peripheral Devices
The PIC18LF45J11T-I/PT is well suited to USB Human Interface Device (HID) peripherals such as custom keyboards, mice, game controllers, and HID-class sensor readouts. Its integrated USB 2.0 Full-Speed peripheral with on-chip transceiver eliminates external PHY cost, while the 32 KB Flash holds the USB stack plus HID report descriptors with room for application logic. The 4 KB SRAM buffers HID reports comfortably, and the 48 MHz / 12 MIPS core handles polling and report assembly without jitter. The 2.0-5.5V LF process supports bus-powered and self-powered designs. Place a 1.5 kohm pull-up on D+ (full-speed), add ESD protection on D+/D-, and bulk-decouple VDD per the Microchip family datasheet.
Được đề xuất
USB CDC Virtual COM Port Bridges
For USB-to-UART bridge designs (CDC class), the PIC18LF45J11T-I/PT combines a hardware USB 2.0 Full-Speed engine, two hardware USARTs, and 32 KB Flash holding the CDC stack plus application code. Operating at 48 MHz, it can sustain 12 Mbps USB traffic while servicing a USART at up to 5 Mbps. The 2.0-5.5V supply range simplifies 5V-tolerant legacy RS-232/RS-485 conversions. Add a USB-B or USB-C connector, ESD array, and VBUS sensing resistor; configure D+ pull-up via firmware for bus-powered enumeration.
Được đề xuất
Low-Power Sensor Node with USB Diagnostics
The PIC18LF45J11T-I/PT's nanoWatt Technology (Idle / Sleep / Deep Sleep modes with sub-uA quiescent current) makes it ideal for battery-powered sensor nodes that periodically expose diagnostics or logs over USB. The 13-channel 10-bit ADC reads temperature, battery voltage, and analog sensors; deep-sleep current stays low enough for multi-year coin-cell life in intermittent applications. When docked, the USB peripheral powers the node and streams accumulated data. The 2.0-5.5V LF range supports both 3.6V Li-SOCl2 primary cells and 5V USB bus power on the same PCB.
Được đề xuất
Industrial Control Front Panels
Industrial HMI panels with USB service ports use the PIC18LF45J11T-I/PT to drive keypads, character LCDs, LED indicators, and rotary encoders. The 34 I/O pins accommodate 4x4 keyscans, an 8-bit LCD bus, status LEDs, and dedicated peripheral pins for SPI/I2C sensor expansion. The 2.0-5.5V supply is directly compatible with industrial 5V logic rails, and the -40C to +85C industrial temperature range survives factory-floor environments. The 12 MIPS performance refreshes displays without visible flicker.
Được đề xuất
Consumer Appliance Control Boards
In consumer appliances (coffee machines, kitchen hoods, washing-machine front panels), the PIC18LF45J11T-I/PT provides reliable 8-bit control with USB service-port connectivity for firmware updates and diagnostics. Its 32 KB Flash holds USB bootloader plus application code, and 4 KB SRAM supports touch-button debounce and EEPROM emulation. The 5.5V-tolerant LF silicon interfaces directly with 5V triac drivers and relay coils. The TQFP-44 footprint is friendly to low-cost 2-layer FR-4 boards, and nanoWatt sleep modes reduce idle consumption below Energy Star thresholds.
Được đề xuất
Test and Measurement Dongles
The PIC18LF45J11T-I/PT fits USB-attached test and measurement dongles - simple oscilloscope probes, logic analyzers with USB streaming, USB-controlled power-supply programmers, and laboratory data loggers. Its 48 MHz core, 10-bit ADC, and 2 USARTs enable basic waveform sampling and digital-protocol bridging (SPI/I2C/UART to USB). The 32 KB Flash accommodates vendor-specific USB descriptors plus measurement firmware, and 4 KB SRAM buffers ADC samples before USB transmission. The 2.0-5.5V supply rails support both USB bus power and external bench supply operation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF45J11T-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 | PIC18LF46J11-I/PT | PIC18LF45J10-I/PT | PIC18LF45J10-I/P |
|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (P) - same family; NOT pin-compatible |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash | 32 KB | 64 KB (+100%) | 32 KB (same) | 32 KB (same) |
| SRAM | 4 KB | 4 KB (same) | 2 KB (-50%) | 2 KB (-50%) |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) |
| USB Peripheral | Yes (USB 2.0 Full-Speed) | Yes (USB 2.0 Full-Speed) - same | Yes (USB 2.0 Full-Speed) - same | Yes (USB 2.0 Full-Speed) - same |
| I/O Pins | 34 | 34 (same) | 34 (same) | 34 (same) |
| NanoWatt Power Saving | Yes | Yes - same | Yes - same | Yes - same |
Bảo phân biệt quan trọng
- Larger SRAM than PIC18LF45J10-I/PT (vsPIC18LF45J10-I/PT)
- Lower Flash than PIC18LF46J11-I/PT (vsPIC18LF46J11-I/PT)
- 5V-tolerant LF silicon vs 3.3V-only F silicon (vsPIC18F45J11T-I/PT (F variant))
Ghi chú thiết kế
The PIC18LF45J11T-I/PT operates from 2.0V to 5.5V on the LF process. For USB bus-powered designs, ensure VBUS does not exceed 5.5V under transient conditions - add a TVS diode or Zener clamp. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (the TQFP-44 has multiple VDD pins: 10, 20, 30, 40). A 4.7 uF bulk capacitor near the IC is recommended for ADC reference stability. The nanoWatt Sleep and Deep Sleep modes drop quiescent current to microampere levels - disable the USB transceiver before entering Sleep to avoid phantom bus power draw.
TQFP-44 (PT) packages use 0.8 mm lead pitch on a 10 x 10 mm body. Route the USB D+/D- differential pair with 90 ohm characteristic impedance, length-matched within 2 mm, and keep them away from switching traces. Place the 48 MHz crystal/oscillator close to OSC1/OSC2 pins with short, symmetric traces and a guard ground. Multiple VDD/VSS pins reduce inductance; tie all of them to the respective planes, not just one pair. Add a ferrite bead or inductor on VBUS for conducted-EMI compliance on USB designs.
Do not exceed the absolute maximum VDD of 5.5V (LF) or 3.6V (F); the LF variant is required for 5V-tolerant designs. The MCLR pin must have a 10 kohm pull-up to VDD; a hard reset below VDD = 2.0V will brown-out the part. ICSP programming via PGC/PGD (RB6/RB7) requires these pins to be configured correctly in firmware - disable analog selection on RB6/RB7 during programming. For USB Full-Speed operation, the internal 48 MHz PLL must be enabled and stabilized before USB enumeration - allow at least 1 ms startup time after PLL lock.
Thông tin tuân thủ
RoHS compliance confirmed via Microchip product page. PT suffix indicates lead-free TQFP package per Microchip ordering convention. Halogen-free status not specified in retrieved data and is marked 'unknown'. AEC-Q100 not applicable for non-automotive-grade MCU; the automotive-grade equivalent is the PIC18LF45J11-I/PT vs. PIC18LF45J11T-I/PT tape-and-reel variant. Conflict-minerals compliance per Microchip statement.