PIC18LF44J11-I/PT - 8-bit 48MHz 16KB Flash MCU 44-TQFP | Microchip
MPN： PIC18LF44J11-I/PT ✓ 啟用中PIC18LF44J11-I/PT 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and programmable peripherals into one package. Within the broader category hierarchy, an 8-bit MCU sits between simple logic ICs and 32-bit application processors; PIC18F devices specifically belong to the enhanced mid-range 8-bit family, optimized for cost-sensitive, low-power, deterministic real-time applications where C-compilable instruction set and rich peripherals matter more than raw compute throughput.
Key features include nanoWatt eXtreme Low Power (XLP) technology with sleep currents as low as 20 nA, an integrated 10-bit A/D converter with up to 13 channels, two analog comparators, a hardware RTCC, and four timer modules supporting Capture/Compare/PWM. The device also features an enhanced instruction set with C-friendly addressing, on-chip debugging via ICD, and self-programming Flash for field firmware updates.
Architecture-wise, the PIC18LF44J11 uses a Harvard-style RISC core with a 16-bit instruction word and 8-bit data path, allowing compact code density while supporting linear addressing up to 2 MB. Internal PLL and 4x multiplier deliver 48 MHz from a wide range of crystal or oscillator inputs, providing deterministic interrupt latency for real-time control loops in motor, lighting, and sensor applications.
Typical applications include battery-powered IoT sensor nodes, USB HID peripherals, industrial control panels, medical monitoring devices, automotive body controllers, and home appliances. The wide voltage tolerance and nanoWatt sleep modes also suit energy-harvesting designs.
When designing with this part, plan oscillator selection carefully: the LF suffix indicates 2.0-5.5 V operation (lower-power analog), whereas the F (5 V) variant has different analog biasing. Use ICD headers for debug and consider migrating to PIC18F27K42 or PIC18F46K22 for newer designs.
直接替換替代品，適用於 PIC18LF44J11-I/PT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF44J11-I/PT （相同外形與佔位） — 差異在於 ADC, Communication, MSL Level, Operating Temperature, Timers.
PIC18LF44J10-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF45J11-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF4455-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18F44J11-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF46J11-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF44J11-I/PT 最大額定值與電氣特性
| Core | PIC18 8-bit RISC |
| Operating Frequency | 48 MHz (12 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 4 KB |
| Supply Voltage (Vdd) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| 封裝 | 44-pin TQFP (10x10 mm) |
| ADC | 10-bit, up to 13 channels |
| Timers | 4 (Timer0/1/2/3) |
| Communication | UART, SPI, I2C |
| 工作溫度 | -40 C to +85 C (Industrial) |
| Low-Power Technology | nanoWatt XLP |
| 安裝類型 | Surface Mount |
| Lead-Free / RoHS | Lead-free, RoHS compliant |
| MSL 等級 | MSL 3 |
PIC18LF44J11-I/PT 腳位配置
| 腳位 1 | MCLR — Master Clear (reset) input, active low |
| 腳位 2 | RA0/AN0 — Digital I/O / analog input AN0 |
| 腳位 3 | RA1/AN1 — Digital I/O / analog input AN1 |
| 腳位 4 | RA2/AN2/Vref- — Digital I/O / analog input AN2 / ADC negative reference |
| 腳位 5 | RA3/AN3/Vref+ — Digital I/O / analog input AN3 / ADC positive reference |
| 腳位 6 | RA4 — Digital I/O (open-drain) |
| 腳位 7 | RA5/AN4 — Digital I/O / analog input AN4 |
| 腳位 8 | Vss — Ground reference |
| 腳位 9 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| 腳位 10 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| 腳位 11 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| 腳位 12 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| 腳位 13 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| 腳位 14 | RC3 — Digital I/O |
| 腳位 15 | RC4 — Digital I/O |
| 腳位 16 | RC5 — Digital I/O |
| 腳位 17 | RC6/TX/CK — Digital I/O / UART TX / I2C clock |
| 腳位 18 | RC7/RX/DT — Digital I/O / UART RX / I2C data |
| 腳位 19 | Vss — Ground reference |
| 腳位 20 | Vdd — Positive power supply |
| 腳位 21 | RB0/AN12 — Digital I/O / analog input AN12 |
| 腳位 22 | RB1/AN10 — Digital I/O / analog input AN10 |
| 腳位 23 | RB2/AN8 — Digital I/O / analog input AN8 |
| 腳位 24 | RB3/AN9 — Digital I/O / analog input AN9 |
| 腳位 25 | RB4 — Digital I/O (interrupt-on-change) |
| 腳位 26 | RB5 — Digital I/O (interrupt-on-change) |
| 腳位 27 | RB6/PGC — Digital I/O / ICSP clock (ICD) |
| 腳位 28 | RB7/PGD — Digital I/O / ICSP data (ICD) |
| 腳位 29 | Vdd — Positive power supply |
| 腳位 30 | Vss — Ground reference |
| 腳位 31 | RD0 — Digital I/O port D |
| 腳位 32 | RD1 — Digital I/O port D |
| 腳位 33 | RD2 — Digital I/O port D |
| 腳位 34 | RD3 — Digital I/O port D |
| 腳位 35 | RD4 — Digital I/O port D |
| 腳位 36 | RD5 — Digital I/O port D |
| 腳位 37 | RD6 — Digital I/O port D |
| 腳位 38 | RD7 — Digital I/O port D |
| 腳位 39 | RE0/AN5 — Digital I/O / analog input AN5 |
| 腳位 40 | RE1/AN6 — Digital I/O / analog input AN6 |
| 腳位 41 | RE2/AN7 — Digital I/O / analog input AN7 |
| 腳位 42 | RE3 — Digital I/O port E |
| 腳位 43 | Vdd — Positive power supply |
| 腳位 44 | Vss — Ground reference |
典型應用
PIC18LF44J11-I/PT 適用於 7 應用s: Battery-Powered IoT Sensor Nodes, Industrial Control Panels, USB HID Peripherals, Home Appliance Controllers, Medical Monitoring Devices, Automotive Body Controllers, LED Lighting and Display Controllers.
Battery-Powered IoT Sensor Nodes
The PIC18LF44J11-I/PT fits battery-powered IoT sensor nodes thanks to its nanoWatt XLP technology with sleep currents down to 20 nA and a wide 2.0-5.5 V supply range that supports direct lithium battery or 2xAA operation. With 16 KB Flash, the device accommodates OTA-capable sensor firmware, BLE/Wi-Fi co-processor command handling, and local data logging. The 4 KB RAM holds time-stamped sensor frames, while the 10-bit ADC samples temperature, humidity, or analog front-ends at low duty cycle for years of battery life.
推薦
Industrial Control Panels
In industrial control panels, the PIC18LF44J11-I/PT provides the deterministic 8-bit performance and wide operating voltage needed for 24 V tolerant designs with regulator step-down. Its 34 I/O pins drive relays, contactors, indicator LEDs, and 7-segment displays directly, while UART and SPI connect to HMI displays and remote I/O expanders. The -40 C to +85 C industrial temperature range tolerates cabinet environments, and the 12 MIPS throughput ensures fast scan cycles for PLC-style logic.
推薦
USB HID Peripherals
The PIC18LF44J11-I/PT serves USB HID peripherals like custom keyboards, mice, and HID-class joysticks when paired with the PIC18LF4455-I/PT sibling variant that adds USB 2.0 Full-Speed. The MCU's 48 MHz core delivers 12 MIPS, enough to manage USB polling intervals while running HID report logic and LED effects. Its 4 KB RAM handles HID report buffers, and 16 KB Flash stores USB stack plus application firmware with room for vendor-specific descriptors.
推薦
Home Appliance Controllers
Home appliances such as washing machines, dishwashers, and microwave ovens use the PIC18LF44J11-I/PT for front-panel control and motor sequencing. The 10-bit ADC reads temperature sensors, water-level probes, and user potentiometers with adequate resolution, while PWM modules drive triac-fired heating elements and variable-speed pump motors. The 16 KB Flash accommodates state-machine firmware with safety interlocks, and the industrial temperature range handles the heat-soaked enclosure environment.
推薦
Medical Monitoring Devices
In medical monitoring equipment like pulse oximeters, digital thermometers, and portable spirometers, the PIC18LF44J11-I/PT provides the low-power 8-bit compute, accurate 10-bit ADC, and reliable Flash integrity required for FDA-cleared Class II devices. The nanoWatt sleep modes extend battery life between charges, while the wide 2.0-5.5 V supply supports direct Li-ion operation. The 4 KB RAM is sufficient for storing short trend buffers and device configuration parameters.
推薦
Automotive Body Controllers
For non-safety automotive body electronics like interior lighting, mirror controllers, and seat-position memory, the PIC18LF44J11-I/PT handles LIN slave communication, PWM dimming, and switch debouncing. The MCU's 34 I/O pins drive multiple LED strings and read user buttons. Designers should note that AEC-Q100 Grade 1 qualification requires moving to automotive-qualified PIC18 K-series parts like PIC18F25K80-I/SO, but the LF44J11 is widely used in non-safety subsystems with automotive-grade power supply design.
推薦
LED Lighting and Display Controllers
LED lighting fixtures and small display panels use the PIC18LF44J11-I/PT for color-mixing and dimming control via multiple PWM channels. The MCU's 12 MIPS throughput manages DMX512 or DALI receive over UART plus PWM generation for RGBW LED strings. With 4 KB RAM, the device buffers DMX frame data and fade math without external memory, and the 2.0 V minimum supply supports direct Li-ion driver designs for portable luminaires.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF44J11-I/PT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18LF44J10-I/PT | PIC18LF45J11-I/PT | PIC18LF4455-I/PT | PIC18F44J11-I/PT | PIC18LF46J11-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same | 44-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 16 KB | 8 KB | 32 KB | 16 KB | 16 KB | 64 KB |
| RAM | 4 KB | 2 KB | 4 KB | 4 KB | 4 KB | 8 KB |
| Operating Voltage | 2.0 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 | 4.2 V to 5.5 V | 2.0 V to 5.5 V |
| USB Support | No | No | No | Yes (USB 2.0 FS) | No | No |
| Max Frequency | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 34 |
主要差異化特點
- Wide voltage range supports 3.3 V and 5 V designs (對比PIC18F44J11-I/PT)
- Memory density without package change (對比PIC18LF44J10-I/PT)
- No USB peripheral keeps BOM cost low (對比PIC18LF4455-I/PT)
設計說明
The PIC18LF44J11-I/PT supports 2.0 V to 5.5 V single-supply operation but requires proper decoupling: place a 100 nF ceramic capacitor as close as possible to each Vdd/Vss pair (multiple pins exist - pins 8/19/30/44 are Vss and pins 20/29/43 are Vdd). A bulk 10 uF tantalum or aluminum polymer capacitor near the IC reduces voltage dips during high-current GPIO toggling. For nanoWatt XLP designs, follow Microchip TB1100 guidelines and configure unused I/O as outputs to minimize leakage.
Layout the 44-pin TQFP with a 4-layer PCB (signal/ground/power/signal) to keep the 0.8 mm pitch traces short and impedance-controlled. Use a single solid ground plane under the device to provide a low-impedance return path for switching currents. Place the crystal oscillator within 5 mm of pins 9/10 with a guard ring to isolate it from noisy switching traces, and route ICSP pins RB6/RB7 directly to a 6-pin header for ICD debugging per Microchip AC164121 recommendations.
When migrating from PIC18LF44J11 to PIC18LF46K22 or PIC18F27K42, do NOT assume pin compatibility - the peripheral mapping has shifted between J-series and K-series, even when the TQFP package matches. Always consult the Microchip product selection tool and check the actual pin assignment table. Also note that LF (low-voltage) variants behave differently in ADC at voltages below 3.0 V - the F variant provides better linearity above 4.5 V. For 5 V-only designs, prefer the F variant.
For SPI runs above 10 MHz, add 33 ohm series resistors at the SCK and SDO pins to dampen reflections on the bus. The PIC18LF44J11-I/PT can drive SPI at up to 24 MHz in master mode but board-level ringing becomes problematic beyond 10 MHz without source termination. I2C lines should be pulled up to Vdd with 2.2 kohm to 4.7 kohm resistors depending on bus capacitance, and use the MSSP module's slew-rate control for slower speeds to reduce EMI in noise-sensitive analog designs.
合規資訊
RoHS and REACH compliant per Microchip material declarations. Not AEC-Q100 qualified - choose PIC18F25K80-I/SO for automotive Grade 1. Lead-free and halogen-free packaging confirmed via LCSC and DigiKey listings.