PIC18LF26J50T-I/SO - 64KB Flash USB MCU 28-SOIC | Microchip
MPN: PIC18LF26J50T-I/SO ✓ Hoạt độngPIC18LF26J50T-I/SO Tóm tắt
The PIC18 microcontroller family is an 8-bit Harvard-architecture RISC MCU line widely used in cost-sensitive embedded designs. The 18J sub-family specifically adds Full-Speed USB hardware on-chip, eliminating the need for an external PHY. Within the broader taxonomy, a PIC18 sits beneath the umbrella of "microcontroller" -> "8-bit MCU" -> "embedded controller" -> "semiconductor IC", and the 18J series occupies the middle of the PIC18 performance range, balancing USB connectivity with low power.
Key differentiating features include 64 KB self-programmable Flash with 1 KB of dedicated EEPROM, a CTMU (Charge Time Measurement Unit) for capacitive touch and time-of-flight sensing, an enhanced instruction set with 16-bit instructions, and nanoWatt XLP power management with multiple deep-sleep modes. The integrated USB 2.0 Full-Speed transceiver with on-chip voltage regulator streamlines USB device designs without external crystals for low-speed/full-speed bus operation.
Architecturally, the PIC18LF26J50T uses a modified Harvard core with a 16-bit instruction word and an 8-bit data path, two 31-level hardware stacks, and a vectored interrupt controller with two priority levels. The 28-SOIC package exposes up to 21 general-purpose I/O pins through peripheral pin select (PPS-less, fixed-pin) mappings and supports In-Circuit Serial Programming (ICSP) and In-Circuit Debug (ICD) via the standard Microchip two-wire interface.
Typical applications include USB HID peripherals (mice, keyboards, custom input devices), USB-to-UART bridges, low-cost data loggers, sensor front-ends with capacitive touch, and battery-powered industrial sensors. The wide industrial temperature range and nanoWatt XLP modes make the part suitable for unattended remote nodes.
Designers should note that the LF (low-voltage) core limits VDD to 2.0–3.3 V; designs requiring 5 V operation must select the non-LF "PIC18F26J50T-I/SO" sibling. The internal voltage regulator for USB requires a 5 V tolerant VBUS rail via an internal charge pump - consult the datasheet's USB section for the required capacitor network on VUSB/VCAP pins.
This page synthesizes distributor pricing, drop-in alternatives within the same 28-SOIC footprint, and practical design notes covering the USB regulator network, low-power sleep mode selection, and ICSP/ICD pin allocation not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF26J50T-I/SO — 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 PIC18LF26J50T-I/SO (cùng hình factor và footprint) — khác nhau ở Core Architecture, Package, Operating Temperature, RoHS Status, ADC.
PIC18LF26J50-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F26J50T-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F26J50-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF25J50T-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF25K50T-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF26J50T-I/SO Tỷ lệ tối đa & tính chất điện
| Product Series | PIC® 18J |
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Program Memory | 64 KB Flash |
| RAM | 4 KB |
| Maximum CPU Frequency | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| USB Interface | USB 2.0 Full-Speed Device/Host/OTG (on-chip transceiver) |
| I/O Pins | 21 (estimated from 28-SOIC pinout) |
| ADC | 10-bit, up to 13 channels |
| Analog Comparators | 2 |
| CCP / ECCP Modules | 2 |
| CTMU | Yes (Charge Time Measurement Unit) |
| nanoWatt XLP | Yes |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Hộp | 28-SOIC (0.295 in / 7.50 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Programming / Debug | ICSP + ICD (2-wire) |
| Packaging Form | Tape & Reel (T suffix) |
Cấu hình chân PIC18LF26J50T-I/SO
| Chân 1 | MCLR — Master Clear (reset) input, active low; requires pull-up for normal operation |
| Chân 2 | RA0 — Port A bit 0 / analog input |
| Chân 3 | RA1 — Port A bit 1 / analog input |
| Chân 4 | RA2 — Port A bit 2 / analog input |
| Chân 5 | RA3 — Port A bit 3 / analog input (also VREF+) |
| Chân 6 | RA4 — Port A bit 4 / analog input / Timer0 clock |
| Chân 7 | RA5 — Port A bit 5 / analog input |
| Chân 8 | VSS — Ground reference |
| Chân 9 | RA7 — Port A bit 7 / oscillator pin |
| Chân 10 | RA6 — Port A bit 6 / oscillator pin |
| Chân 11 | RC0 — Port C bit 0 |
| Chân 12 | RC1 — Port C bit 1 |
| Chân 13 | VCAP — Internal 3.3 V regulator output capacitor |
| Chân 14 | VUSB — USB internal regulator input (5 V from VBUS) |
| Chân 15 | D- — USB D- data line |
| Chân 16 | D+ — USB D+ data line |
| Chân 17 | RC2 — Port C bit 2 |
| Chân 18 | RC3 — Port C bit 3 |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage (2.0–3.6 V) |
| Chân 21 | RB0 — Port B bit 0 / interrupt-on-change |
| Chân 22 | RB1 — Port B bit 1 / interrupt-on-change |
| Chân 23 | RB2 — Port B bit 2 / interrupt-on-change |
| Chân 24 | RB3 — Port B bit 3 / interrupt-on-change |
| Chân 25 | RB4 — Port B bit 4 / interrupt-on-change |
| Chân 26 | RB5 — Port B bit 5 / interrupt-on-change |
| Chân 27 | PGC — Port B bit 6 / ICSP clock (ICD programming) |
| Chân 28 | PGD — Port B bit 7 / ICSP data (ICD programming) |
Ứng dụng tiêu biểu
PIC18LF26J50T-I/SO phù hợp cho 6 Áp dụngs: USB HID Peripheral Devices, USB-to-UART / USB-to-SPI Bridge, Capacitive Touch Sensor Front-End, Low-Power Data Logger, Industrial Sensor Hub with USB Diagnostics, USB Custom Class Device (Vendor-Specific).
USB HID Peripheral Devices
The PIC18LF26J50T-I/SO is ideal for USB Human Interface Device (HID) peripherals such as custom keyboards, mice, game controllers, and presentation remote controls. The integrated Full-Speed USB 2.0 transceiver eliminates external PHY cost and the 64 KB Flash plus 4 KB RAM are sufficient for HID class descriptors plus application logic. Microchip's free USB stack and HID bootloader occupy roughly 20 KB of Flash, leaving headroom for firmware features. The 28-SOIC footprint simplifies hand assembly for low-volume HID products, and the nanoWatt XLP modes allow battery-powered HID designs drawing micro-amps in suspend. Engineers should follow Microchip AN1199 (USB CDC/HID on PIC18) for descriptor templates and bus-powered suspend current budgeting to stay within USB 2.0 spec limits.
Được đề xuất
USB-to-UART / USB-to-SPI Bridge
Using the on-chip USB transceiver and a software USB-CDC or USB-MSC stack, the PIC18LF26J50T-I/SO can implement a low-cost USB-to-UART or USB-to-SPI bridge for legacy equipment modernization. The PIC18 EUSART plus MSSP peripheral handles asynchronous serial and SPI/I2C, and the 48 MHz core keeps UART error rates low at common baud rates up to 921600 bps. The industrial -40 °C to +85 °C range covers factory-floor and outdoor bridge installations. Designers should enable the 48 MHz PLL mode for accurate USB clocking and add proper ESD protection (USBLC6-2SC6 or equivalent) on D+/D- lines for ruggedized industrial deployments per Microchip AN1295 (USB embedded design guidelines).
Được đề xuất
Capacitive Touch Sensor Front-End
The PIC18LF26J50T-I/SO's integrated CTMU (Charge Time Measurement Unit) enables robust capacitive touch sensing for buttons, sliders, and proximity sensors without an external touch IC. Combined with the 10-bit ADC and 13 analog channels, the MCU can scan a 12-key matrix with hardware-driven timing rather than software loops, freeing CPU cycles for communication. The nanoWatt XLP deep-sleep mode allows battery-powered touch wake-up applications that spend most of their life in sub-µA sleep. Application note AN1250 (Microchip mTouch™ CTMU) provides reference C code for button debounce and slider interpolation, and the SOIC-28 footprint leaves enough GPIO for status LEDs and a host interface.
Được đề xuất
Low-Power Data Logger
The PIC18LF26J50T-I/SO suits battery-powered data loggers that periodically wake to sample sensors, write to external EEPROM or Flash, and return to deep sleep. The 4 KB RAM buffers 1 ksps ADC bursts between wake events, and the RTCC with dedicated 32 kHz crystal keeps wall-clock time across multi-month deployments. Total quiescent draw below 1 µA in sleep with RTCC active makes 1-year+ battery life feasible on a single CR2032 for low-rate logging (one sample per minute). The USB transceiver doubles as the data-extraction port when the user plugs into a host, avoiding a separate UART connector. Designers should consult Microchip AN1416 (Low-Power Design with PIC MCUs) for sleep-mode selection and brown-out reset thresholds.
Được đề xuất
Industrial Sensor Hub with USB Diagnostics
The PIC18LF26J50T-I/SO acts as a sensor hub reading analog/digital inputs and exposing them over USB to a host PC for diagnostics, calibration, and field service. The two analog comparators handle threshold alarms without ADC wake-up, and the ECCP modules can drive PWM outputs for proportional control. The industrial -40 °C to +85 °C temperature grade and the wide-pin SOIC-28 footprint suit DIN-rail-mounted industrial enclosures. With proper TVS protection on USB and external I/O, this MCU can survive the surge and ESD events common in motor-control cabinets. Reference Microchip's AN1078 (USB firmware upgrade over USB) for field-update capability.
Được đề xuất
USB Custom Class Device (Vendor-Specific)
For vendor-specific USB devices such as lab instruments, programming tools, and test fixtures, the PIC18LF26J50T-I/SO offers the Full-Speed USB bandwidth and sufficient Flash for custom protocol stacks. The 64 KB Flash accommodates vendor-class descriptors plus proprietary command handlers, while the 12 MIPS core sustains bulk-transfer throughput without dropping packets. The industrial temperature grade plus standard Microchip longevity program makes this part viable for 10+ year product cycles in lab and test gear. Use the Microchip USB Framework (MCHPFSUSB) as a starting point and customize the vendor request handlers for proprietary commands; this approach is documented in AN1166 (USB vendor-class on PIC18).
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF26J50T-I/SO — 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 | PIC18LF26J50-I/SO | PIC18F26J50T-I/SO | PIC18F26J50-I/SO | PIC18LF25J50T-I/SO | PIC18LF25K50T-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Program Memory (Flash) | 64 KB | 64 KB - same | 64 KB - same | 64 KB - same | 32 KB (-50%) | 32 KB (-50%) |
| RAM | 4 KB | 4 KB - same | 4 KB - same | 4 KB - same | 2 KB (-50%) | 2 KB (-50%) |
| VDD Range | 2.0 V to 3.6 V (LF core) | 2.0–3.6 V - same | 2.0–3.3 V (F core, 5 V tolerant I/O) | 2.0–3.3 V (F core) | 2.0–3.6 V - same | 2.0–3.6 V - same |
| USB Interface | USB 2.0 Full-Speed Device/Host/OTG | Same | Same | Same | Same | Same |
| Core Architecture | PIC18 RISC 48 MHz / 12 MIPS | Same | Same | Same | Same | PIC18 K-series (newer core with HW divider) |
| Industrial Temperature | -40 °C to +85 °C | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same |
Bảo phân biệt quan trọng
- Largest Flash and RAM in 28-SOIC PIC18 J-series USB line (vsPIC18LF25J50T-I/SO)
- On-chip CTMU for capacitive touch without external IC (vsPIC18LF14K50T-I/SO)
- LF core variant for low-voltage-only designs (vsPIC18F26J50T-I/SO)
Ghi chú thiết kế
The PIC18LF26J50T-I/SO requires a 2.0–3.6 V supply on VDD (pin 20) with VSS (pins 8 and 19) tied to ground. The USB internal 3.3 V regulator draws from VUSB (pin 14, supplied from 5 V VBUS) and requires a decoupling capacitor on VCAP (pin 13). Estimated: total quiescent current in sleep with RTCC active is below 1 µA at 3.3 V; in full-speed USB active mode the part draws approximately 15–20 mA at 48 MHz. Add a ferrite bead or small L-C filter on VUSB if the upstream VBUS rail is noisy.
Do not connect VBUS (5 V) directly to VDD on the LF core variant - the LF core is only rated to 3.6 V on VDD. Use the internal USB regulator (VUSB → VCAP) for the USB transceiver and supply VDD separately from a 3.3 V regulator (MCP1700 or similar). When migrating from the F-core PIC18F26J50, double-check that any 5 V signal connected to a digital input is within the LF core's VDD + 0.3 V absolute-maximum spec to avoid latch-up. The MCLR pin (1) needs a 10 kΩ pull-up to VDD and a 100 nF to ground for proper reset behavior; do not leave MCLR floating.
Place the 100 nF VDD decoupling capacitor within 5 mm of pin 20, and the VCAP capacitor (typically 220 nF per Microchip AN587) within 5 mm of pin 13. The D+/D- traces (pins 15/16) must be routed as a 90 Ω differential pair with ground reference and length-matched to within 150 mil. Keep USB traces away from switching regulator or high-current signals to minimize EMI coupling. The 28-SOIC wide-body (7.50 mm) package allows generous trace routing underneath, but leave a ground pour stitched with vias around the MCU body for thermal dissipation and EMI shielding.
When using the 48 MHz primary oscillator for USB operation, route the crystal traces (RA6/RA7, pins 9/10) over a continuous ground plane and keep them short - under 10 mm crystal-to-pin trace length is recommended. Add 1 MΩ parallel load resistors across the crystal if the oscillator shows poor start-up behavior at cold temperatures. For high-EMI environments, place a small ferrite bead on VUSB between the upstream VBUS source and pin 14, and add a common-mode choke on the USB cable side per USB 2.0 compliance guidelines in AN1295.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Supplied in lead-free matte-tin finish. Sourced from RMI-compliant facilities. Not AEC-Q100 qualified - for automotive applications consult Microchip's AEC-Q100 PIC MCU portfolio.
