PIC18LF45J10-I/ML - 8-Bit 40MHz 32KB Flash MCU 44-QFN | Microchip
MPN: PIC18LF45J10-I/ML ✓ نشطPIC18LF45J10-I/ML نظرة عامة
What is a PIC18 microcontroller? PIC18 is Microchip's high-performance 8-bit PIC family built on a Harvard RISC architecture. It sits in the taxonomy: PIC18 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. PIC18 devices are widely used because they combine deterministic instruction execution, mature toolchains (MPLAB X, XC8), and rich peripheral integration. The LF sub-family indicates a low-voltage core optimized for 2.0-3.6V operation, distinct from the 5V-tolerant F and K-series variants.
Key features of the PIC18LF45J10 include 32 KB FLASH (16K x 16 words), 1 KB data RAM, an internal 31 kHz to 8 MHz oscillator with PLL, two analog comparators, two PWM modules (10-bit), three timers plus a watchdog timer, a hardware RTCC, and nanoWatt technology for sleep currents in the microamp range. Communication interfaces comprise two MSSP (SPI/I2C) modules, an enhanced USART with auto-baud detect, and a full-speed USB 2.0 device controller - a notable feature for an 8-bit MCU at this price point.
The device uses a 16-bit instruction word with an 8-bit data path, providing 77 effective instructions and a 2-deep hardware stack plus 31-level software stack. Two capture/compare/PWM modules and three 16-bit timers support motor control, lighting, and mixed-signal front-ends. The on-chip 10-channel, 10-bit ADC enables sensor reading directly without external conversion.
Typical applications include USB HID peripherals (mice, keyboards, custom HID), industrial sensor nodes, low-power handheld instruments, and consumer appliances. The QFN-44 package suits space-constrained designs, while the exposed pad (EP) provides a low thermal-resistance path for the internal voltage regulator. USB applications are particularly common because of the integrated transceiver and SIE.
When designing with this MCU, allocate a 4.7 uF bulk capacitor plus a 100 nF decoupling pair near each power pin. The VUSB pin requires an internal 3.3V regulator for USB transceiver supply, and the on-chip LVD/BOR provides safe brownout behavior for battery-powered systems.
This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
بدائل مباشرة لـ PIC18LF45J10-I/ML — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18LF45J10-I/ML (نفس عامل الشكل والبصمة) — يختلف في Package, Timers, Core Architecture, I/O Pins, MSL Level.
PIC18LF45J10T-I/ML
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF44J10-I/ML
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F45J10-I/ML
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF45J10-I/ML الحدود القصوى والخصائص الكهربائية
| Core | PIC18 8-bit RISC |
| Program Memory (FLASH) | 32 KB (16K x 16 words) |
| Data RAM | 1 KB |
| Data EEPROM | Not present (FLASH self-write emulation) |
| Maximum CPU Clock | 40 MHz |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Pins | 32 |
| العلبة | 44-pin QFN (8x8 mm) with Exposed Pad |
| نوع التركيب | Surface Mount |
| ADC | 10-bit, up to 13 channels |
| Timers | 3 x 16-bit + 1 WDT |
| PWM Modules | 2 (10-bit ECCP) |
| Comparators | 2 analog comparators |
| Communication | 2x MSSP (SPI/I2C), EUSART, USB 2.0 FS Device |
| درجة حرارة التشغيل | -40C to +85C (Industrial) |
| حالة RoHS | Compliant |
تكوين أطراف PIC18LF45J10-I/ML
| دبوس 1 | RB5/PGM — PORTB I/O bit 5 / LVP programming pin |
| دبوس 2 | RB4 — PORTB I/O bit 4 |
| دبوس 3 | RB3/AN9 — PORTB I/O bit 3 / analog input 9 |
| دبوس 4 | RB2/AN8 — PORTB I/O bit 2 / analog input 8 |
| دبوس 5 | RB1/AN10 — PORTB I/O bit 1 / analog input 10 |
| دبوس 6 | RB0/AN12 — PORTB I/O bit 0 / analog input 12 |
| دبوس 7 | VSS — Ground reference |
| دبوس 8 | VDD — Positive supply 2.0-3.6V |
| دبوس 9 | RA5/AN4 — PORTA I/O bit 5 / analog input 4 |
| دبوس 10 | RA4/T0CKI — PORTA I/O bit 4 / Timer0 clock input |
| دبوس 11 | RA3/AN3/VREF+ — PORTA I/O bit 3 / analog input 3 / ADC VREF+ |
| دبوس 12 | RA2/AN2/VREF- — PORTA I/O bit 2 / analog input 2 / ADC VREF- |
| دبوس 13 | RA1/AN1 — PORTA I/O bit 1 / analog input 1 |
| دبوس 14 | RA0/AN0 — PORTA I/O bit 0 / analog input 0 |
| دبوس 15 | VSS — Ground reference |
| دبوس 16 | VDD — Positive supply 2.0-3.6V |
| دبوس 17 | RC7/RX/DT — PORTC I/O bit 7 / EUSART RX |
| دبوس 18 | RC6/TX/CK — PORTC I/O bit 6 / EUSART TX |
| دبوس 19 | RC5/D+/VP — PORTC I/O bit 5 / USB D+ / programming voltage |
| دبوس 20 | RC4/D-/VM — PORTC I/O bit 4 / USB D- |
| دبوس 21 | RC3/SCL — PORTC I/O bit 3 / I2C clock (MSSP) |
| دبوس 22 | RC2/SDA — PORTC I/O bit 2 / I2C data (MSSP) |
| دبوس 23 | RC1 — PORTC I/O bit 1 |
| دبوس 24 | RC0 — PORTC I/O bit 0 |
| دبوس 25 | VSS — Ground reference |
| دبوس 26 | VDD — Positive supply 2.0-3.6V |
| دبوس 27 | RD7 — PORTD I/O bit 7 |
| دبوس 28 | RD6 — PORTD I/O bit 6 |
| دبوس 29 | RD5 — PORTD I/O bit 5 |
| دبوس 30 | RD4 — PORTD I/O bit 4 |
| دبوس 31 | RD3 — PORTD I/O bit 3 |
| دبوس 32 | RD2 — PORTD I/O bit 2 |
| دبوس 33 | RD1 — PORTD I/O bit 1 |
| دبوس 34 | RD0 — PORTD I/O bit 0 |
| دبوس 35 | VUSB — Internal 3.3V USB regulator output (decoupling cap) |
| دبوس 36 | RE3 — PORTE I/O bit 3 |
| دبوس 37 | RE2/CS — PORTE I/O bit 2 / SPI chip select |
| دبوس 38 | RE1/WR — PORTE I/O bit 1 / external memory write |
| دبوس 39 | RE0/RD — PORTE I/O bit 0 / external memory read |
| دبوس 40 | AVSS — Analog ground |
| دبوس 41 | AVDD — Analog positive supply |
| دبوس 42 | MCLR/RE5 — Master clear reset / PORTE bit 5 |
| دبوس 43 | OSC1/RA7 — Crystal oscillator input / PORTA bit 7 |
| دبوس 44 | OSC2/RA6 — Crystal oscillator output / PORTA bit 6 |
التطبيقات النموذجية
PIC18LF45J10-I/ML مناسب لـ 6 التطبيقs: USB HID Peripheral Devices, Industrial Sensor Nodes, Low-Power Handheld Instruments, Consumer Appliance Controls, LED Lighting and Dimming, Motor Control and Small BLDC Drivers.
USB HID Peripheral Devices
The PIC18LF45J10-I/ML integrates a full-speed USB 2.0 device controller with on-chip transceiver and SIE, eliminating external USB interface chips. Its 32 KB FLASH and 1 KB SRAM comfortably fit HID class descriptors and report buffers for keyboards, mice, game controllers, and custom HID input devices. The 32 GPIO and PWM channels handle LED feedback and key matrix scanning on a single chip.
موصى به
Industrial Sensor Nodes
With its 10-bit ADC (up to 13 channels), two analog comparators, and 2.0-3.6V operating range, the PIC18LF45J10-I/ML is a fit for industrial sensor conditioning and digital readout. The 32 KB FLASH supports Modbus RTU or IO-Link device stacks. nanoWatt sleep modes extend battery life in wireless or remote sensor installations where idle current is critical.
موصى به
Low-Power Handheld Instruments
The PIC18LF45J10-I/ML powers handheld meters, scanners, and measurement tools that need ADC, PWM, and USB charging simultaneously. Its 40 MHz CPU at 3.3V provides enough headroom for FFT, calibration, and UI rendering on small LCDs. The exposed pad QFN-44 keeps the footprint compact while managing thermal dissipation from the on-chip 3.3V regulator during USB-active states.
موصى به
Consumer Appliance Controls
Consumer appliances such as coffee machines, fans, and washing-machine UI boards benefit from the PIC18LF45J10-I/ML's 32 GPIO, 2 PWM channels, and 2 analog comparators for temperature and motor feedback. The 32 KB FLASH supports menu-driven UIs and fault logs, while the I2C/SPI MSSP interfaces connect to display drivers and EEPROM storage. The 2.0-3.6V rail is friendly to 3.3V regulators common in household designs.
موصى به
LED Lighting and Dimming
Two 10-bit PWM modules and three 16-bit timers allow the PIC18LF45J10-I/ML to drive multi-channel LED dimmers with smooth fading curves. The EUSART and MSSP peripherals accept commands from DMX, DALI bridges or wireless modules, while the ADC monitors current and temperature for closed-loop protection. The 2.0V minimum supply enables direct Li-Ion operation without additional regulation.
موصى به
Motor Control and Small BLDC Drivers
The PIC18LF45J10-I/ML handles small BLDC, stepper and DC motor control through its ECCP/PWM, comparators for back-EMF sensing, and QEI for position feedback via timers. 32 KB FLASH supports field-oriented control or trapezoidal commutation algorithms. The 2.0-3.6V core suits battery-driven robotics, drones, and small appliances where 5V parts are unnecessary.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LF45J10-I/ML — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18LF45J10T-I/ML | PIC18LF44J10-I/ML | PIC18F45J10-I/ML |
|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH Memory | 32 KB | 32 KB | 16 KB | 32 KB |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB |
| Core Variant | LF (2.0-3.6V) | LF (2.0-3.6V) | LF (2.0-3.6V) | F (2.0-3.6V) |
| Max CPU Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| USB | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device |
| Price (qty 1, USD) | 5.95 | 5.95 | 5.40 | 6.05 |
أبرز الفروقات
- Lower-voltage LF core with same peripherals as F variant (مقابلPIC18F45J10-I/ML)
- On-chip USB 2.0 full-speed transceiver (مقابلPIC18LF2520-I/ML)
- Larger FLASH and richer peripheral mix (مقابلPIC18LF25J10-I/ML)
ملاحظات التصميم
Place a 4.7 uF bulk capacitor plus a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair. The PIC18LF45J10-I/ML has four VDD pins (8, 16, 26, 41) and three VSS/AVSS pins (7, 15, 25, 40); each must be properly decoupled. Add a 470 nF cap on the VUSB pin to stabilize the internal 3.3V USB regulator output. For battery-powered designs, the nanoWatt sleep current drops below 1 uA when all peripherals are disabled.
The 44-QFN exposed pad must be soldered to a continuous copper pour (preferably connected to ground) to provide thermal dissipation for the on-chip LDO regulator. Microchip recommends at least 1 square inch of 2 oz copper on the EP. Use a 4x4 via array (0.3 mm hole, 0.5 mm pitch) under the pad to improve thermal conductivity to inner planes.
Common pitfalls: (1) Connecting D+ to VUSB directly without a 15 kohm pull-up to 3.3V, which prevents USB enumeration. (2) Leaving the MCLR pin floating - it must have a 10 kohm pull-up to VDD, or else the device will randomly reset. (3) Programming in low-voltage (LVP) mode requires PGM pin handling - use high-voltage (HVP) for production to avoid contention. (4) The J-series PIC18LF45J10 does not include data EEPROM; use FLASH self-write emulation libraries instead.
Keep the 12 MHz USB clock traces (crystal or external source) within 5 mm of the OSC pins. Route D+/D- as a 90-ohm differential pair with matching length (delta < 2 mm) and continuous ground reference. Avoid routing D+/D- near switching converter nodes; place a guard ground via fence on both sides of the pair to suppress common-mode noise that can fail USB-IF compliance.
معلومات الامتثال
RoHS and REACH compliance confirmed via Microchip product page. Industrial -40C to +85C temperature grade; not AEC-Q100 qualified. Lead-free and halogen-free per Microchip material declarations.