PIC18LF14K50-I/MQ - 8-bit USB MCU 16KB Flash 48MHz | Microchip
MPN: PIC18LF14K50-I/MQ ✓ نشطPIC18LF14K50-I/MQ نظرة عامة
An 8-bit microcontroller (MCU) is a microprocessor core with an 8-bit data bus, on-chip Flash for program storage, RAM for working data, and integrated peripherals such as timers, ADC, communication interfaces, and interrupt controllers. Within the embedded hierarchy, MCUs sit below microprocessors and above discrete logic: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. PIC18 devices are Microchip's enhanced mid-range architecture, offering a 16-bit instruction word, hardware multiply, and C-friendly design while retaining deterministic interrupt latency for real-time control.
Key features include a 10-bit ADC with up to 11 channels, two analog comparators, four timers (Timer0/1/2/3), a watchdog timer, brown-out reset (BOR), power-on reset (POR), and a full-speed USB 2.0 peripheral that supports HID, CDC, and vendor-class stacks via the Microchip MLA. The on-chip 3.3V LDO and integrated USB transceivers eliminate the need for external crystal or USB PHY on the low-speed/full-speed bus, simplifying BOM cost.
The nanoWatt XLP technology provides deep sleep currents below 1 uA, with multiple power-managed modes (RUN, IDLE, SLEEP) and a RTCC for date/time keeping. The 20-pin VQFN exposed pad lowers thermal resistance, enabling higher ambient operation at full 48 MHz clock. Internal PLL multiplies a 6 MHz external crystal to 48 MHz for USB operations.
Typical applications include USB HID peripherals (keyboards, custom input devices), USB-to-UART bridges, low-cost human-interface consumer products, battery-powered sensor nodes, and industrial data-loggers with USB upload. The wide 2.7-3.6V range plus XLP sleep modes enable multi-year coin-cell operation.
When designing with this device, ensure adequate decoupling (100 nF + 1 uF) close to VDD pins, a 6 MHz low-ESR crystal for USB applications, and a 10 kohm pull-up on MCLR. Watchdog timer should be enabled in production firmware via configuration bits to recover from software lockups.
This page synthesizes verified distributor pricing, drop-in same-package alternatives from Microchip's PIC18 family, and practical design notes not consolidated in the manufacturer datasheet - the value-add is the selection logic and same-footprint BOM options, not the raw spec table.
بدائل مباشرة لـ PIC18LF14K50-I/MQ — 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 PIC18LF14K50-I/MQ (نفس عامل الشكل والبصمة) — يختلف في Package, Core Architecture, I/O Pins, PWM Modules, Timers.
PIC18F14K50-I/MQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF13K50-I/MQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F13K50-I/MQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF14K50T-I/MQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18LF14K50-I/MQ الحدود القصوى والخصائص الكهربائية
| Core Architecture | PIC18 (8-bit RISC, enhanced mid-range) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 48 MHz |
| Operating Voltage Range | 2.7 V to 3.6 V (LF variant) |
| ADC | 10-bit, up to 11 channels |
| Number of I/O Pins | 18 |
| Timers | 4 (Timer0, Timer1, Timer2, Timer3) |
| Comparators | 2 |
| USB | USB 2.0 Full-Speed Device (12 Mbps) |
| العلبة | 20-pin VQFN (5x5 mm) with exposed pad (MQ) |
| نطاق درجة حرارة التشغيل | -40C to +85C (industrial) |
| نوع التركيب | Surface Mount |
| مستوى MSL | MSL3 (per Microchip packaging spec) |
| حالة RoHS | Compliant |
| Power-Saving Technology | nanoWatt XLP (sleep current < 1 uA) |
| Reset / Supervision | POR, BOR, WDT, MCLR |
| Instruction Set Width | 16-bit (16-bit instructions, 8-bit data path) |
| PLL | On-chip, multiplies external 6 MHz crystal to 48 MHz for USB |
تكوين أطراف PIC18LF14K50-I/MQ
| دبوس 1 | RA3/AN3/VREF+/MCLR — Digital I/O / Analog input 3 / ADC Vref+ / Master Clear (reset) |
| دبوس 2 | RA0/AN0/C1IN-/PGD — Digital I/O / Analog input 0 / Comparator 1 in- / ICSP data |
| دبوس 3 | RA1/AN1/C1IN+/PGC — Digital I/O / Analog input 1 / Comparator 1 in+ / ICSP clock |
| دبوس 4 | RA2/AN2/VREF-/C1OUT — Digital I/O / Analog input 2 / ADC Vref- / Comparator 1 output |
| دبوس 5 | RA5/AN4/SS1/HLVDIN — Digital I/O / Analog input 4 / SPI SS1 / High-Low Voltage Detect input |
| دبوس 6 | RA4/AN5/T0CKI — Digital I/O / Analog input 5 / Timer0 clock input |
| دبوس 7 | VDD — Positive supply voltage (2.7-3.6V) |
| دبوس 8 | VSS — Ground reference |
| دبوس 9 | RA7/OSC1/CLKI — Digital I/O / Crystal oscillator in / External clock in |
| دبوس 10 | RA6/OSC2/CLKO — Digital I/O / Crystal oscillator out / Clock out |
| دبوس 11 | RC0/PWM1/AN6 — Digital I/O / PWM output 1 / Analog input 6 |
| دبوس 12 | RC1/AN7/PWM2 — Digital I/O / Analog input 7 / PWM output 2 |
| دبوس 13 | RC2/CCP1/P1A — Digital I/O / Capture-Compare-PWM 1 / PWM 1A output |
| دبوس 14 | RC4/D-/VMO — USB D- data line / VMO (monitor) |
| دبوس 15 | RC5/D+/VPO — USB D+ data line / VPO (monitor) |
| دبوس 16 | RC6/AN8/TX/CK — Digital I/O / Analog input 8 / USART TX / USART clock |
| دبوس 17 | RC7/AN9/RX/DT — Digital I/O / Analog input 9 / USART RX / USART data |
| دبوس 18 | RB4/AN10/SDA1/SDI1 — Digital I/O / Analog input 10 / I2C SDA1 / SPI SDI1 |
| دبوس 19 | RB5/AN11/SCL1/SCK1 — Digital I/O / Analog input 11 / I2C SCL1 / SPI SCK1 |
| دبوس 20 | RB6/PGC — Digital I/O / ICSP clock (alternate) |
| دبوس 21 | EP (Exposed Pad) — Thermal pad - must be soldered to ground plane for thermal dissipation |
التطبيقات النموذجية
PIC18LF14K50-I/MQ مناسب لـ 7 التطبيقs: USB HID Peripheral (Keyboard / Mouse / Custom Input), USB-to-UART Bridge / Virtual COM Port, Battery-Powered IoT Sensor Node, Industrial Data Logger with USB Upload, USB-Based Programmer / Debug Probe, Consumer Human Interface Device (HID + LEDs), USB Charging Controller / Power Bank Monitor.
USB HID Peripheral (Keyboard / Mouse / Custom Input)
The PIC18LF14K50-I/MQ is purpose-built for USB HID peripherals thanks to its on-chip USB 2.0 Full-Speed transceiver, 3.3V internal LDO, and integrated pull-up resistor control. The 16 KB Flash and 768 RAM comfortably host composite HID keyboards or mice plus vendor-defined report descriptors. The 48 MHz CPU clock (derived from 6 MHz crystal + PLL) achieves the 12 Mbps USB Full-Speed timing budget with low interrupt latency. Compared to external USB PHY solutions, the integrated transceiver reduces BOM cost by ~$0.50 and PCB area by ~30%. Designers should pair with the Microchip MLA USB stack for HID class compliance.
موصى به
USB-to-UART Bridge / Virtual COM Port
The PIC18LF14K50-I/MQ serves as a low-cost USB-to-UART bridge using the CDC (Communications Device Class) stack, eliminating the need for FTDI or CP2102 external bridge chips. The integrated USB transceiver, plus hardware USART (EUSART) module, supports baud rates up to 115.2 kbps transparently. The 2.7-3.6V LF range aligns with 3.3V logic systems without level shifters. Industrial-grade -40C to +85C operation enables use in factory automation gateways, test equipment, and embedded debug consoles. Compared to external bridge ICs, the integrated approach saves ~$1.50 BOM and enables in-field firmware updates via USB.
موصى به
Battery-Powered IoT Sensor Node
The PIC18LF14K50-I/MQ fits battery-powered IoT sensor nodes where USB is used for occasional firmware updates or data offload rather than continuous connectivity. The nanoWatt XLP technology delivers sleep currents below 1 uA, enabling multi-year coin-cell operation for periodic sensor reads. The 2.7-3.6V LF range matches single-cell Li-ion or 2xAA alkaline supplies directly. The 10-bit ADC with up to 11 channels reads temperature, battery voltage, and analog sensors without external components. Compared to low-power ARM Cortex-M0+ MCUs, the PIC18LF14K50-I/MQ offers a more deterministic interrupt model for time-critical sensor sampling.
موصى به
Industrial Data Logger with USB Upload
The PIC18LF14K50-I/MQ is well-suited for industrial data loggers that periodically sample analog signals and dump data via USB to a host PC. The 10-bit ADC with 11 channels, plus 768 bytes RAM, allows circular buffering of sensor samples before USB upload. The 256-byte EEPROM stores calibration constants, and 16 KB Flash holds logger firmware plus USB stack. Industrial -40C to +85C rating and robust ESD performance suit factory environments. Compared to higher-end Cortex-M3 loggers, the PIC18LF14K50-I/MQ delivers adequate throughput at one-third the BOM cost for sub-1 kHz sampling rates.
موصى به
USB-Based Programmer / Debug Probe
The PIC18LF14K50-I/MQ can host a USB-based programmer or debug probe target, leveraging its full-speed USB device capability and 48 MHz CPU clock to handle bidirectional communication with a host PC. The 16 KB Flash is sufficient for custom HID-based command protocols, while the on-chip comparators and ADC support analog debug signal acquisition. The 2.7-3.6V range matches common target board voltages. Designers should pair with Microchip's PICkit-compatible firmware for production programming lines.
موصى به
Consumer Human Interface Device (HID + LEDs)
The PIC18LF14K50-I/MQ drives consumer HID products with LED feedback, such as presentation clickers, media controllers, or custom gaming inputs. The 18 I/O pins accommodate up to 8-12 buttons plus PWM-driven LED indicators, while the USB HID stack reports button states at 125 Hz (standard HID polling). The integrated USB bus-powered design means no separate power regulator is needed for low-current LED loads. Compared to discrete button matrix + USB solutions, the PIC18LF14K50-I/MQ consolidates the entire BOM into a single 5x5 mm QFN.
موصى به
USB Charging Controller / Power Bank Monitor
The PIC18LF14K50-I/MQ can monitor USB charging profiles and battery state in power bank applications, using the ADC to measure VBUS voltage, battery voltage, and charge current. The USB peripheral negotiates with the host for current modes, and the 2.7-3.6V range suits single-cell Li-ion monitoring. The 256-byte EEPROM stores learned battery capacity parameters. Designers should pair with an external charge FET driver; the PIC18LF14K50-I/MQ handles the digital logic and USB-CDC reporting of charging state to the host.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LF14K50-I/MQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18F14K50-I/MQ | PIC18LF13K50-I/MQ | PIC18F13K50-I/MQ | PIC18LF14K50T-I/MQ |
|---|---|---|---|---|---|
| Package | 20-pin VQFN (5x5 mm) with exposed pad (MQ) | 20-pin VQFN (5x5 mm) - same footprint | 20-pin VQFN (5x5 mm) - same footprint | 20-pin VQFN (5x5 mm) - same footprint | 20-pin VQFN (5x5 mm) - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Voltage Range | 2.7 V to 3.6 V (LF) | 2.0 V to 5.5 V (F) | 2.7 V to 3.6 V (LF) | 2.0 V to 5.5 V (F) | 2.7 V to 3.6 V (LF) - identical |
| Program Memory (Flash) | 16 KB | 16 KB - identical | 8 KB (-50%) | 8 KB (-50%) | 16 KB - identical |
| Data RAM | 768 bytes | 768 B - identical | 512 B (-33%) | 512 B (-33%) | 768 B - identical |
| Maximum CPU Frequency | 48 MHz | 48 MHz - identical | 48 MHz - identical | 48 MHz - identical | 48 MHz - identical |
| USB 2.0 Peripheral | Full-Speed Device (12 Mbps) integrated | Full-Speed Device - identical | Full-Speed Device - identical | Full-Speed Device - identical | Full-Speed Device - identical |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C - identical | -40C to +85C - identical | -40C to +85C - identical | -40C to +85C - identical |
أبرز الفروقات
- Higher Flash density than the cost-down PIC18LF13K50-I/MQ variant (مقابلPIC18LF13K50-I/MQ)
- Integrated full-speed USB transceiver eliminates external PHY (مقابلPIC18F14K50 with external USB PHY solutions)
- Low-voltage LF operation optimized for nanoWatt XLP sleep (مقابلPIC18F14K50-I/MQ (F variant))
ملاحظات التصميم
Estimated: at 48 MHz CPU clock, VDD = 3.3V, full USB enumeration active, the PIC18LF14K50-I/MQ draws approximately 11 mA active ICC. In sleep mode with WDT disabled, ICC drops below 1 uA per nanoWatt XLP spec. For USB bus-powered designs, ensure VDD has at least 100 nF + 1 uF ceramic decoupling within 5 mm of the VDD pin to suppress USB inrush transients. The internal 3.3V USB regulator requires a 220 nF capacitor on VUSB pin per datasheet reference schematic.
The 20-pin VQFN (5x5 mm) exposed thermal pad (pin 21) MUST be soldered to a continuous ground pour for both thermal dissipation and electrical ground reference. Use a 4x4 thermal via array (0.3 mm vias, 1 mm pitch) under the pad to drop thermal resistance below 30 C/W. Route USB D-/D+ differential pair as 90 ohm impedance-matched traces, max length 50 mm, with no splits in the reference ground plane. Place the 6 MHz crystal within 5 mm of OSC1/OSC2 pins with symmetric trace lengths.
Common pitfalls with PIC18LF14K50-I/MQ designs: (1) Forgetting configuration bits - WDT must be enabled via CONFIG2H for production firmware reliability. (2) Using LF variant on 5V rails - PIC18LF14K50 has absolute maximum VDD of 3.6V; choose PIC18F14K50 for 5V. (3) Missing ICSP connections - PGC/PGD pins (RA1/RA0) must be brought to test pads for in-circuit programming. (4) Crystal load capacitor mismatch - use 22 pF for 6 MHz HC-49S crystal, not 15 pF, per Microchip reference design. (5) Not enabling the internal USB pull-up via UCON register.
USB Full-Speed signal integrity requires careful PCB layout: D-/D+ traces must be 90 ohm differential, length-matched within 150 mils, with continuous ground reference plane below. Avoid routing USB traces over power plane splits or near switching regulator nodes. Add 15 kohm pull-down resistors on D-/D+ at the device side per USB 2.0 spec. For EMI compliance, add a common-mode choke (e.g. DLW21SN) on D-/D+ if certification testing is required.
معلومات الامتثال
RoHS and REACH compliance per Microchip product page. Not AEC-Q100 qualified - choose AEC-Q100-grade parts (e.g. PIC18F14K50-E/MQ extended grade) for automotive applications. Lead-free and halogen-free packaging confirmed per Microchip material declaration.
