PIC18LF2423-I/SO - 8-Bit 40MHz 16KB Flash MCU 28-SOIC | Microchip
MPN: PIC18LF2423-I/SO ✓ Hoạt độngPIC18LF2423-I/SO Tóm tắt
What is a Microcontroller (MCU)? A microcontroller is a single-chip computer containing a CPU core, program memory (Flash/ROM), data memory (RAM), non-volatile storage (EEPROM), and a range of peripheral interfaces such as ADC, timers, UART, SPI, and I/O ports. MCUs belong to the broader category of embedded processors and are foundational building blocks of modern electronic systems. Within Microchip's PIC18F family, the PIC18LF2423 is the LF (low-voltage/low-power) variant, distinguished from the standard PIC18F2423 by its lower core voltage range.
Key features of the PIC18LF2423-I/SO include a 12-bit Analog-to-Digital Converter (ADC) with up to 12 channels, nanoWatt power management for reduced sleep current, and enhanced Flash memory with self-programming capability. The architecture supports both internal and external oscillator modes, and the device integrates multiple communication peripherals such as EUSART, MSSP (SPI/I2C), and enhanced CCP modules. The industrial temperature grade (-40C to +85C) ensures operation in harsh environments.
Technical depth: The PIC18LF2423 uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access. The enhanced Flash supports 100,000 erase/write cycles typical, and the 16-bit instruction word with 8-bit data path delivers roughly 10 MIPS performance at 40 MHz. nanoWalt technology offers multiple Idle and Sleep modes with on-the-fly oscillator switching, allowing power budgets in the microamp range when the CPU is halted.
Typical applications include industrial control systems, low-power sensor interfaces, battery-operated instruments, automotive body electronics (non-safety), consumer appliances, and USB/HID peripherals when paired with an external transceiver. The wide voltage range also makes the part attractive for 3.3V and 5V mixed-logic designs without level shifters.
Design considerations: For reliable Flash writes, ensure VDD stays within the regulated 2.0V-5.5V window; below this threshold, in-circuit programming may fail. The 28-SOIC package has limited thermal dissipation, so at 40 MHz with peripheral-heavy workloads a small copper pour is recommended for production boards.
This page synthesizes distributor pricing, drop-in compatible alternatives from Microchip's PIC18F family, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for selection decisions on the PIC18LF2423-I/SO.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF2423-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 PIC18LF2423-I/SO (cùng hình factor và footprint) — khác nhau ở Package, ADC, Timers, I/O Pins, Core Architecture.
PIC18F2423-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2420-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF23K22-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF2523-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF2423-I/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18F, 8-bit RISC |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 12-bit, up to 12 channels |
| Hộp | 28-pin SOIC (SO-28, 0.295 inch / 7.50 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Temperature Grade | Industrial, -40C to +85C |
| Communication Peripherals | EUSART, MSSP (SPI/I2C) |
| Timers | Timer0, Timer1, Timer2, Timer3 |
| Power-Saving Modes | nanoWatt technology (Idle, Sleep) |
| Self-Programming | Yes (Flash program memory) |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 1 (unlimited floor life) |
Cấu hình chân PIC18LF2423-I/SO
| Chân 1 | RA0/AN0 — Digital I/O / Analog input 0 |
| Chân 2 | RA1/AN1 — Digital I/O / Analog input 1 |
| Chân 3 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC VREF- |
| Chân 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Chân 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 6 | RA5/AN4/SS — Digital I/O / Analog input 4 / SPI slave select |
| Chân 7 | RA6 — Digital I/O / oscillator pin |
| Chân 8 | RA7 — Digital I/O / oscillator pin |
| Chân 9 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 10 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 11 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Chân 12 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Chân 13 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM 1 |
| Chân 14 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 16 | RC5/SDO — Digital I/O / SPI data out |
| Chân 17 | RC6/TX/CK — Digital I/O / EUSART TX / clock |
| Chân 18 | RC7/RX/DT — Digital I/O / EUSART RX / data |
| Chân 19 | VSS — Ground |
| Chân 20 | VDD — Positive supply (2.0V-5.5V) |
| Chân 21 | RB0/INT0 — Digital I/O / external interrupt 0 |
| Chân 22 | RB1/INT1 — Digital I/O / external interrupt 1 |
| Chân 23 | RB2/INT2 — Digital I/O / external interrupt 2 |
| Chân 24 | RB3/CCP2 — Digital I/O / Capture/Compare/PWM 2 |
| Chân 25 | RB4 — Digital I/O |
| Chân 26 | RB5 — Digital I/O |
| Chân 27 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 28 | RB7/PGD — Digital I/O / ICSP data |
Ứng dụng tiêu biểu
PIC18LF2423-I/SO phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Module, Battery-Operated Handheld Instrument, Home Appliance Control Board, Automotive Body Electronics (Non-Safety), USB HID / Human Interface Device, Educational / Maker Development Platform.
Industrial Sensor Interface Module
The PIC18LF2423-I/SO is well matched to industrial sensor interfaces because of its 12-bit ADC with up to 12 channels, 2.0V-5.5V supply tolerance and -40C to +85C industrial temperature grade. The 16 KB Flash accommodates calibration tables and linearization routines for thermocouples, RTDs and 4-20 mA loops. Engineers place the MCU between the sensor front-end (e.g. op-amp gain stage) and an RS-485 link, sampling at up to 100 ksps and applying digital filtering. Unlike a discrete ADC + logic design, the integrated MCU eliminates a chip and reduces BOM cost. Trade-off: the 28-SOIC has limited thermal headroom; for high-CPU-duty loads, route a small copper pour to VDD/GND pins to keep junction temperature below the 85C ambient limit.
Được đề xuất
Battery-Operated Handheld Instrument
The PIC18LF2423-I/SO fits battery-operated handhelimeters via nanoWalt technology that drops sleep current below typical MCU runaways. The 2.0V-5.5V supply window allows two-AA alkaline or single-cell Li-ion with a low-dropout regulator, and 16 KB Flash supports firmware for keypad scanning, LCD driving, and measurement algorithms. The 25 I/O pins can directly drive a multiplexed character LCD plus keypad matrix. Compared with newer XLP families, the LF2423's sleep current is higher, so for sub-1 uA budgets consider PIC18LF23K22-I/SO instead. Trade-off: at 40 MHz the part draws roughly 11 mA active, so duty-cycling the CPU is critical for multi-month battery life.
Được đề xuất
Home Appliance Control Board
The PIC18LF2423-I/SO is commonly deployed in home appliance control boards (washing machines, dishwashers, microwave ovens) because its 12-bit ADC accurately reads temperature and motor current, and its 16 KB Flash holds menu/cycle state machines. The integrated EUSART and MSSP (SPI/I2C) peripherals connect to indicator panels and motor-driver ICs without external glue logic. The 2.0V-5.5V supply lets the MCU share a 5V or 3.3V rail with the keypad scanner. Trade-off: appliance boards often need AEC-Q100 equivalents for safety-critical zones, so the LF2423 is appropriate for non-safety zones while a Q-graded MCU handles the safety MCU role.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The PIC18LF2423-I/SO is a fit for automotive body electronics such as interior lighting, seat controllers, mirror adjusters and HVAC flaps where AEC-Q100 is not required. The wide 2.0V-5.5V supply tolerates cranking transients when paired with a TVS diode and bulk capacitor. The 25 I/O pins drive LED drivers and read switch matrices directly. For safety-critical ECUs (airbag, ABS, steering), choose an AEC-Q100 qualified MCU instead. Trade-off: automotive temperature requires the -40C to +125C E-spec variant, so verify part number suffix (LF2423T-I/SO vs E-temp grade).
Được đề xuất
USB HID / Human Interface Device
The PIC18LF2423-I/SO can implement a USB HID device when paired with an external USB transceiver such as the MCP2200 or through software bit-banging on I/O pins. The 16 KB Flash stores HID report descriptors and application logic, while the 768 B RAM buffers HID reports before transmission. Compared with native-USB PIC MCUs, the LF2423 needs more firmware work for USB signalling, but the LF supply is ideal for low-power accessories. Trade-off: at 40 MHz CPU the bit-banged USB timing is achievable; below 24 MHz, USB low-speed polling becomes unreliable.
Được đề xuất
Educational / Maker Development Platform
The PIC18LF2423-I/SO is a common teaching MCU because of its mature MPLAB X toolchain, generous 16 KB Flash and forgiving 28-SOIC footprint (easy to hand-solder). The PIC18F instruction set is widely documented in textbooks and Microchip application notes. The LF supply allows USB-powered debug boards to power the MCU directly from a 3.3V LDO. Trade-off: for ultra-low-power or capacitive-touch demos, the newer PIC18LF23K22-I/SO offers more modern peripherals at similar cost.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF2423-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 | PIC18F2423-I/SO | PIC18LF2420-I/SO | PIC18LF23K22-I/SO | PIC18LF2523-I/SO |
|---|---|---|---|---|---|
| Package | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 16 KB | 16 KB | 16 KB | 8 KB (-50%) | 32 KB (+100%) |
| Data RAM | 768 bytes | 768 bytes | 768 bytes | 512 bytes (-33%) | 1536 bytes (+100%) |
| Operating Voltage Range | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (no LF support) | 2.0 V to 5.5 V (LF) | 1.8 V to 5.5 V (LF, wider) | 2.0 V to 5.5 V (LF) |
| ADC Resolution | 12-bit | 12-bit | 10-bit (-2 bits) | 12-bit | 12-bit |
| Maximum CPU Speed | 40 MHz | 40 MHz | 40 MHz | 64 MHz | 40 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| AEC-Q100 Qualified | No | No | No | No | No |
Bảo phân biệt quan trọng
- 12-bit ADC vs 10-bit on PIC18LF2420 (vsPIC18LF2420-I/SO)
- Wider LF supply range vs F variant (vsPIC18F2423-I/SO)
- Mature peripheral set vs newer XLP (vsPIC18LF23K22-I/SO)
Ghi chú thiết kế
For reliable Flash self-programming on the PIC18LF2423-I/SO, VDD must stay within the regulated 2.0V-5.5V window during the write cycle. Brown-out below 2.0V risks partial writes that brick the program memory. Add a 100 nF decoupling capacitor adjacent to the VDD pin (20) and a 10 uF bulk capacitor on the supply rail. For battery-powered designs, ensure the LDO stays in regulation at end-of-life battery voltage before any Flash update operation.
Place the 28-SOIC decoupling capacitors as close as possible to the VDD/VSS pins (20/19) and run short, wide traces to minimize inductance. The ICSP pins RB6/PGC (27) and RB7/PGD (28) should be brought to test pads for in-circuit programming. Because the 28-SOIC has limited thermal mass, route a small copper pour on VDD and VSS to dissipate the ~11 mA active current without significant junction temperature rise.
Do not assume the LF2423 is a drop-in for PIC18F2423 at 3.3V: the standard F variant is rated 4.2V-5.5V and will not operate reliably below 4.2V. When migrating code between LF and F variants, check the configuration bits for the internal oscillator and brown-out voltage thresholds. Also note that ADC reference selection (RA3=VREF+/RA2=VREF-) requires the reference pins to be configured as analog inputs before ADC sampling to avoid digital noise coupling.
When using the PIC18LF2423-I/SO ADC for precision measurements, the VREF+ and VREF- pins (RA3/RA2) should be bypassed with 100 nF ceramic capacitors placed close to the package. Avoid routing digital switching signals (e.g. RB6/PGC, RB7/PGD, oscillator pins) directly under or adjacent to analog traces - cross-coupling can inject noise into ADC samples. Use the lowest ADC clock divider that still meets the conversion rate requirement to maximize input impedance.
Thông tin tuân thủ
RoHS and lead-free status confirmed via Microchip product page; halogen-free status not explicitly listed in the verified web data; AEC-Q100 not qualified - choose PIC18F25K80 for AEC-Q100 alternatives.
