PIC18LF2550-I/SO - 8-bit USB MCU 48MHz 32KB Flash SOIC-28 | Microchip
MPN: PIC18LF2550-I/SO ✓ פעילPIC18LF2550-I/SO סקירה
What is a PIC18 microcontroller? PIC18 is a family of 8-bit Harvard-architecture microcontrollers from Microchip Technology, sitting within the broader PICmicro hierarchy (PIC10/12/16/18/24/32 families) and competing with AVR, 8051 and Cortex-M devices in the 8/32-bit microcontroller market. The PIC18 family specifically adds enhanced instruction set, linear memory addressing, and richer peripheral integration compared to baseline PIC16 devices, while remaining code-compatible with PIC16C745 USB parts for migration ease.
Key features of the PIC18LF2550 include Full-Speed USB 2.0 compliance with on-chip transceiver and 1.5/12 Mbps endpoints, 32 KB self-programmable Flash, 2 KB SRAM, 256 bytes of EEPROM, a 10-bit ADC with up to 10 channels, two analog comparators, Capture/Compare/PWM modules, and Enhanced Universal Synchronous/Asynchronous Receiver/Transmitter (EUSART). The 'LF' prefix denotes the extended low-voltage process node enabling operation down to approximately 2.0V, distinguishing it from the standard PIC18F2550 which carries a slightly higher minimum Vdd.
Architecturally, the PIC18LF2550 uses a 16-bit modified Harvard architecture with two-cycle instruction fetch and single-cycle ALU execution, augmented by a hardware multiplier and a C compiler-friendly orthogonal register set. The integrated SIE (Serial Interface Engine) and USB transceiver eliminate external PHY needs, allowing direct USB D+/D- connection with minimal external components.
Typical applications include USB HID peripherals, USB-to-UART bridges, USB game controllers, low-speed data loggers with USB interface, and embedded learning platforms where the free Microchip USB stack and MPLAB X IDE shorten development time. The 28-pin SOIC package supports hand-soldering and breadboard-friendly prototyping via carrier boards. When migrating to newer designs, microengineeringlectronic's
Designers should note that the 'LF' variants are recommended for systems below 4.2V, whereas the standard 'F' parts optimize for 4.2V-5.5V operation. Decoupling capacitors (100 nF ceramic plus bulk 10 uF) must be placed within 5 mm of the Vdd pins, and the Vusb pin requires a 200 nF capacitor to ground for internal regulator stability. The internal 48 MHz oscillator can be derived from a 20 MHz crystal via the PLL block, eliminating external high-frequency clock components.
This page synthesizes distributor stock visibility, parametric comparison against drop-in alternatives, USB-specific design notes and price tier breakpoints not found in the standalone manufacturer datasheet.
חלופות תחליף ישיר עבור PIC18LF2550-I/SO — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC18LF2550-I/SO (אותו גורם צורה וטביעת רגל) — שונים ב Package, ADC, I/O Pins, Serial Interfaces, Operating Temperature.
PIC18F2550-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF2455-I/SO
צור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F2455-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF2550-I/SO דירוגים מרביים ומאפיינים חשמליים
| Family | PIC18 |
| Core | 8-bit PIC18 RISC |
| Core Size | 8-bit |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 2 KB |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 48 MHz |
| Supply Voltage Range | 2.0 V to 5.5 V (LF process) |
| ADC | 10-bit, up to 10 channels |
| USB | USB 2.0 Full-Speed, on-chip transceiver |
| I/O Pins | 24 |
| Timers | 4 (Timer0/1/2/3) |
| Capture/Compare/PWM | 2 CCP modules |
| EUSART | Yes (1) |
| Comparators | 2 |
| טמפרטורת פעולה | -40C to +85C (Industrial -I grade) |
| מארז | 28-pin SOIC (SO, wide body, 7.5 mm) |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
| רמת MSL | 1 |
תצורת פינים של PIC18LF2550-I/SO
| פין 1 | MCLR/RE3 — Master Clear (reset) input or digital input RE3 |
| פין 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| פין 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| פין 4 | RA2/AN2/Vref- — PORTA bit 2 / Analog input 2 / ADC Vref- |
| פין 5 | RA3/AN3/Vref+ — PORTA bit 3 / Analog input 3 / ADC Vref+ |
| פין 6 | RA4/T0CKI/RCV — PORTA bit 4 / Timer0 clock input / USB RCV |
| פין 7 | RA5/AN4/SS/HLVDIN — PORTA bit 5 / Analog 4 / SPI slave select / High/Low-Voltage detect input |
| פין 8 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| פין 9 | OSC2/CLKOUT — Crystal oscillator output / clock out (Fosc/4) |
| פין 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| פין 11 | VUSB — Internal USB transceiver 3.3V regulator output; tie 220 nF cap to Vss |
| פין 12 | VBUS — USB bus power monitor input |
| פין 13 | D- — USB D- data line |
| פין 14 | D+ — USB D+ data line |
| פין 15 | RC4 — PORTC bit 4 / general digital I/O |
| פין 16 | RC5 — PORTC bit 5 / general digital I/O |
| פין 17 | RC6/TX/CK — PORTC bit 6 / EUSART TX / clock line |
| פין 18 | RC7/RX/DT — PORTC bit 7 / EUSART RX / data line |
| פין 19 | Vss — Ground reference |
| פין 20 | Vdd — Positive supply (2.0V-5.5V LF variant) |
| פין 21 | RB0/AN12/INT0 — PORTB bit 0 / Analog 12 / external interrupt 0 |
| פין 22 | RB1/AN10/INT1 — PORTB bit 1 / Analog 10 / external interrupt 1 |
| פין 23 | RB2/AN8/INT2 — PORTB bit 2 / Analog 8 / external interrupt 2 |
| פין 24 | RB3/AN9/CCP2 — PORTB bit 3 / Analog 9 / Capture-Compare-PWM 2 |
| פין 25 | RB4/AN11 — PORTB bit 4 / Analog 11 |
| פין 26 | RB5/AN13 — PORTB bit 5 / Analog 13 |
| פין 27 | RB6/ICSPCLK — PORTB bit 6 / In-Circuit Serial Programming clock (also low-voltage ICSP entry) |
| פין 28 | RB7/ICSPDAT — PORTB bit 7 / In-Circuit Serial Programming data |
יישומים טיפוסיים
PIC18LF2550-I/SO מתאים עבור 6 יישוםs: USB HID Peripherals, USB-to-UART Bridge Adapter, USB Data Logger with Mass Storage, Low-Speed MIDI USB Controller, Industrial USB Sensor Interface, Custom USB Game Controller / Joystick.
USB HID Peripherals
The PIC18LF2550's 48 MHz CPU, integrated USB 2.0 Full-Speed transceiver and 32 KB Flash make it well-suited to USB Human Interface Device (HID) class peripherals such as custom keypads, mice and game controllers. The LF process enables 3.3V operation from a single regulator rail, and the on-chip SIE offloads CRC, token and packet handling from firmware. Compared to external PHY designs, parts count drops by 4-6 components and PCB area falls by roughly 30%. Recommended companions: PIC18LF2550 as the main MCU; Microchip free HID bootloader for field-updatable firmware.
מומלץ
USB-to-UART Bridge Adapter
The PIC18LF2550 implements a CDC class USB-to-UART bridge (i.e. CP210x equivalent) by enumerating as a virtual COM port on the host and using the on-chip EUSART to drive 3.3V/5V logic-level serial at standard baud rates up to 921600. The 2 KB SRAM is sufficient for 64-byte double-buffered USB packets, and the 32 KB Flash accommodates the CDC stack plus protocol command handlers. Industrial designs use the LF process variant for compatibility with 3.3V targets and 2-wire RS-485 via an external transceiver.
מומלץ
USB Data Logger with Mass Storage
Data loggers that record sensor readings to a USB flash drive benefit from the PIC18LF2550's mass-storage class firmware reference implementation, which exposes the device as a removable disk. The 2 KB SRAM serves as a sector buffer, while the 32 KB Flash stores the SCSI/BBB handler plus application code that periodically reads I2C sensors. With the LF process supporting 2.0V Vdd, the logger can run from two AA cells for unattended field deployments lasting 6-12 months at 1 sample per minute duty cycling.
מומלץ
Low-Speed MIDI USB Controller
In musical instrument applications the PIC18LF2550 drives USB MIDI class streaming endpoints at the standard 31250 bps baud rate while exposing potentiometer and button inputs through its 10-bit ADC (up to 10 channels) and digital I/O. The 48 MHz CPU handles MIDI message parsing with low interrupt latency, and the LF process variant supports battery-powered floor controllers running from 3V coin cells. The 28-SOIC footprint allows mounting in slim 1U enclosures alongside rotary encoders and expression pedals.
מומלץ
Industrial USB Sensor Interface
Industrial USB sensor interfaces use the PIC18LF2550 to aggregate RS-485 sensor data via EUSART and forward to a host PC over USB CDC class. The -I industrial temperature grade supports -40C to +85C panel-mount operation, and the 28-SOIC package withstands wave soldering and conformal coating better than smaller QFN parts. The 32 KB Flash holds both the command-line interpreter and bootloader, enabling firmware updates over USB without equipment disassembly. The LF process variant accepts 3.3V regulated industrial rails.
מומלץ
Custom USB Game Controller / Joystick
Game controllers and arcade sticks use the PIC18LF2550's 10-bit ADC to read up to 10 analog axes (X/Y sticks, triggers, throttles) and digital GPIO for up to 24 buttons, packaging them into a USB HID gamepad descriptor that is recognized natively by Windows, macOS and Linux without drivers. The 48 MHz CPU sustains 1000 Hz polling with sub-millisecond latency, and the 32 KB Flash accommodates per-game button remapping profiles plus force-feedback response tables. The LF process is friendly to 3.3V battery packs in wireless controller designs.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18LF2550-I/SO — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18F2550-I/SO | PIC18LF2455-I/SO | PIC18F2455-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-28 (wide, 7.5 mm) | SOIC-28 (wide, 7.5 mm) - same | SOIC-28 (wide, 7.5 mm) - same | SOIC-28 (wide, 7.5 mm) - same |
| Core / Bits | PIC18 / 8-bit | PIC18 / 8-bit | PIC18 / 8-bit | PIC18 / 8-bit |
| Flash | 32 KB | 32 KB | 24 KB (-25%) | 24 KB (-25%) |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB |
| Max CPU Freq | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Supply Voltage Range | 2.0 V to 5.5 V | 4.2 V to 5.5 V (no 2.0V low) | 2.0 V to 5.5 V | 4.2 V to 5.5 V (no 2.0V low) |
| USB 2.0 FS Transceiver | Integrated | Integrated | Integrated | Integrated |
| EEPROM | 256 B | 256 B | 256 B | 256 B |
מבדילים עיקריים
- Lowest minimum Vdd in the 28-pin USB PIC18 family (לעומתPIC18F2550-I/SO)
- Maximum Flash density (32 KB) in 28-SOIC PIC18 USB family (לעומתPIC18LF2455-I/SO)
- Full 2.0V-5.5V supply plus 32 KB Flash - combination unique in the family (לעומתPIC18F2455-I/SO)
הערות תכנון
Decouple each Vdd/Vss pin pair with a 100 nF ceramic capacitor placed within 5 mm of the package leads, plus a single 10 uF bulk capacitor at the regulator output. The internal USB 3.3V regulator at the VUSB pin (pin 11) requires a 220 nF ceramic cap directly to ground - omit this cap and the USB PHY will fail USB compliance tests. For battery-powered designs below 3.0V Vdd, ensure the regulator can supply at least 25 mA peak (USB enumeration surge) above the MCU's run current of typically 12-15 mA at 48 MHz.
Keep the 20 MHz crystal traces short and symmetric with respect to OSC1/OSC2 (pins 8/9), and place load capacitors within 3 mm of each pin. The USB D+/D- traces (pins 14/13) must be 90 ohm differential-impedance matched, length-matched to within 150 mil, and routed over an unbroken ground plane for HS signal integrity. Avoid routing any digital switching signals across the D+/D- pair or alongside the crystal - both degrade USB signal integrity and increase jitter.
Do not exceed the absolute maximum Vdd of 5.5V on the LF process variant - the low-Vt transistors have smaller headroom than the standard 'F' process. For in-circuit serial programming (ICSP), the ICSPDAT pin 28 must NOT be pulled low during reset or the MCU enters low-voltage programming mode instead of normal application execution, often causing confusing 'bricked' prototypes. Add a 10 kohm pullup to MCLR (pin 1) and to ICSPDAT when leaving the ICSP header populated on production boards.
Estimated: at VBUS = 5V and 48 MHz CPU active, total supply current is approximately 15 mA. If using the internal USB 3.3V regulator to power external peripherals, derate the load to under 10 mA to keep the LDO in dropout margin. The PIC18LF2550's EUSART TX output (RC6, pin 17) cannot drive long cables without a buffer - use an external RS-232 or RS-485 transceiver for industrial cable runs.
מידע על תאימות
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - this is a consumer/industrial USB MCU, not an automotive part. Halogen-free status not stated in web data.
