PIC18LF2458-I/SO - 24KB Flash USB MCU 8-bit 48MHz
MPN： PIC18LF2458-I/SO ✓ 啟用中PIC18LF2458-I/SO 概覽
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, plus peripherals such as timers, communication interfaces, and analog converters. Within the broader taxonomy, the PIC18LF2458 is an 8-bit CISC Harvard-architecture MCU in the PIC18 family of microcontrollers, which itself sits inside Microchip's 8-bit PIC microcontroller portfolio and the wider semiconductor MCU category. It executes most instructions in one instruction cycle, providing 48 MHz / 4 = 12 MIPS performance at maximum clock, and provides three serial ports (FS-USB, I2C, and SPI up to 10 Mbit/s).
Key differentiating features of the PIC18LF2458 include: nanoWatt technology for power-managed sleep modes, a 12-bit A/D converter (versus the 10-bit A/D found on many earlier PIC18F2x/4x parts), 24 digital I/O pins across 28 pins, an internal 31 kHz to 8 MHz oscillator with PLL for 48 MHz operation, and a full-speed USB transceiver on-chip. The combination of integrated USB 2.0, ample memory, and 12-bit ADC in a small SOIC-28 footprint differentiates the LF2458 from simpler 8-bit MCUs that require an external transceiver or ADC.
Technically, the LF2458 uses a 16-bit instruction word Flash architecture with separate program and data buses (Harvard), enabling simultaneous access to instruction and data memory. The CPU features an 8 x 8 hardware multiplier and a barrel shifter, supporting single-cycle multiply operations. Power management offers several low-power modes (Idle, Sleep, and PRI_RUN variants of nanoWatt), with the LF variant extending the operating voltage window down to 2.0V for direct Li-ion coin-cell compatibility.
Typical applications include low-speed USB peripherals (HID, CDC, custom HID-class devices), 12-bit sensor data-acquisition front ends, low-power industrial controllers, and battery-powered instruments that need USB connectivity only when tethered to a host. In each, the on-chip USB transceiver eliminates the external transceiver and 5V regulator typically required by discrete designs. In a battery-powered design, the low-voltage LF range enables direct operation from two alkaline or NiMH cells; in a USB CDC bridge, the LF2458 appears as a virtual COM port without external crystals beyond the standard 20 MHz resonator with PLL.
When designing with the PIC18LF2458, pay attention to the ICD/ICSP header pinout to ensure MCLR, PGC, and PGD are brought out for in-circuit programming. Use a 20 MHz or 24 MHz crystal/resonator with the PLL enabled to derive the 48 MHz system clock required by the USB module. Decouple VDD/VSS with 100 nF + 1 uF near each pair, and keep the D+/D- traces matched and short per the USB 2.0 spec. For lowest sleep current, disable unused peripherals before entering Sleep.
This page synthesizes distributor pricing, SOIC-28 pinout details, and same-family drop-in alternatives drawn from the Microchip pin and code compatibility chart, providing information not assembled in the manufacturer datasheet alone.
直接替換替代品，適用於 PIC18LF2458-I/SO — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF2458-I/SO （相同外形與佔位） — 差異在於 Package, I/O Pins, Timers, Core Architecture, MSL Level.
PIC18F2458-I/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF2458T-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF2455-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF2455T-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF2423-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF2420-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF2458-I/SO 最大額定值與電氣特性
| Family | PIC18F2458/2553/4458/4553 |
| Core | 8-bit PIC18 (Harvard) |
| Program Memory | 24 KB Flash |
| Data Memory (SRAM) | 2 KB |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| 供應電壓 | 2.0 V to 5.5 V |
| 工作溫度 | -40 C to +85 C (Industrial) |
| I/O Pins | 16 (24 digital I/O per datasheet family feature) |
| A/D Converter | 12-bit, up to 12 channels |
| USB | USB 2.0 Full-Speed (12 Mbit/s), on-chip transceiver |
| Serial Interfaces | USB, I2C, SPI (up to 10 Mbit/s), EUSART |
| Timers | Timer0/1/2/3, 16-bit and 8-bit |
| 封裝 | 28-pin SOIC (SO) - 7.50 mm body width |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (Lead Free per datasheet ordering code) |
| ICSP/ICD | Yes (MCLR, PGC, PGD) |
| Power-Saving Modes | nanoWatt technology (Idle, Sleep, PRI_RUN variants) |
PIC18LF2458-I/SO 腳位配置
| 腳位 1 | MCLR/VPP/RE3 — Master Clear (reset) / ICSP programming voltage / digital input RE3 |
| 腳位 2 | RA0/AN0 — PORTA bit 0 / analog input AN0 |
| 腳位 3 | RA1/AN1 — PORTA bit 1 / analog input AN1 |
| 腳位 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input AN2 / ADC VREF- |
| 腳位 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input AN3 / ADC VREF+ |
| 腳位 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock input / comparator 1 output |
| 腳位 7 | RA5/AN4/SS/HLVDIN — PORTA bit 5 / analog input AN4 / SPI slave select / HLVD input |
| 腳位 8 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / PORTA bit 7 |
| 腳位 9 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / PORTA bit 6 |
| 腳位 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| 腳位 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| 腳位 12 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| 腳位 13 | RC4/D-/VMO — PORTC bit 4 / USB D- / ICSP VPP mode output |
| 腳位 14 | RC5/D+/VPO — PORTC bit 5 / USB D+ / ICSP VPP output |
| 腳位 15 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART synchronous clock |
| 腳位 16 | RC7/RX/DT — PORTC bit 7 / EUSART RX / EUSART synchronous data |
| 腳位 17 | RB0/AN12/INT0/FLT0 — PORTB bit 0 / analog input AN12 / external interrupt 0 / PWM fault 0 |
| 腳位 18 | RB1/AN10/INT1 — PORTB bit 1 / analog input AN10 / external interrupt 1 |
| 腳位 19 | RB2/AN8/INT2 — PORTB bit 2 / analog input AN8 / external interrupt 2 |
| 腳位 20 | RB3/AN9/CCP2 — PORTB bit 3 / analog input AN9 / CCP2 I/O |
| 腳位 21 | RB4/AN11 — PORTB bit 4 / analog input AN11 |
| 腳位 22 | RB5/AN13 — PORTB bit 5 / analog input AN13 |
| 腳位 23 | RB6/ICSPCLK/PGC — PORTB bit 6 / ICSP clock / debug clock |
| 腳位 24 | RB7/ICSPDAT/PGD — PORTB bit 7 / ICSP data / debug data |
| 腳位 25 | GND — Logic and I/O ground reference |
| 腳位 26 | VDD — Positive logic supply voltage (2.0 V to 5.5 V) |
| 腳位 27 | VUSB — Internal USB 3.3V regulator output (bypass with capacitor) |
| 腳位 28 | NC — Not connected (per datasheet SOIC-28 pinout) |
典型應用
PIC18LF2458-I/SO 適用於 6 應用s: USB HID Peripheral (Low-Speed Input / Mouse / Keyboard), USB-to-UART Bridge / Virtual COM Port, 12-bit Battery-Operated Sensor Data Logger, Industrial Sensor Front End with USB Diagnostics, Custom USB Audio Class Device (Desktop Audio Dongle), Educational Microcontroller Development Platform.
USB HID Peripheral (Low-Speed Input / Mouse / Keyboard)
The PIC18LF2458-I/SO is a strong fit for low-cost USB Human Interface Devices thanks to its integrated USB 2.0 Full-Speed transceiver and on-chip 8-bit PIC18 core. The 24 KB Flash comfortably hosts HID class descriptors, bootloaders, and application code, while 2 KB SRAM handles HID report buffers without external memory. A 12 MHz external crystal with PLL generates the 48 MHz system clock that USB requires, eliminating the external PHY that would otherwise be needed. Unlike a discrete USB solution, the integrated transceiver also reduces BOM cost and frees PCB area for compact HID devices such as keyboards or custom-control surfaces.
推薦
USB-to-UART Bridge / Virtual COM Port
The PIC18LF2458-I/SO is well matched to USB-CDC virtual COM port bridges. The on-chip USB peripheral presents the device as a serial port on the host without driver installation on modern operating systems, while the EUSART module provides an asynchronous serial link to a target MCU. The 2.0-5.5 V LF range enables the bridge to power from USB VBUS through a 3.3V LDO while still tolerating 5V logic on the target side. The integrated 12-bit ADC can be repurposed for monitoring bridge-side voltages or handshakes, a feature discrete bridges rarely include.
推薦
12-bit Battery-Operated Sensor Data Logger
The PIC18LF2458-I/SO suits portable, battery-operated 12-bit sensor data loggers. The LF variant's 2.0-5.5 V operating range permits direct connection to two alkaline or NiMH cells or a single Li-ion cell, while nanoWatt Sleep mode with all peripherals disabled can drop quiescent current into the microampere range between sample intervals. The 12-bit ADC delivers 4096-step resolution across up to 12 analog inputs, and the 256-byte EEPROM can store calibration constants and time stamps that persist across battery swaps. The 24 KB Flash holds a small RTOS or state-machine scheduler for periodic sampling and USB offload.
推薦
Industrial Sensor Front End with USB Diagnostics
For industrial sensor front ends that need a USB diagnostics port, the PIC18LF2458-I/SO provides a 12-bit ADC for transducer readout, a small but capable Flash for signal-conditioning code, and a USB port for service-port diagnostics. The industrial -40 C to +85 C temperature range is factory-tested for harsh environments. The on-chip USB peripheral lets a field engineer plug the device into a laptop for live data inspection, eliminating the need for a separate debug UART that would compromise the IP-rated housing. Compared with a microcontroller plus external USB PHY, the integrated solution reduces BOM cost and saves board area.
推薦
Custom USB Audio Class Device (Desktop Audio Dongle)
The PIC18LF2458-I/SO can host a custom low-latency USB audio class (UAC) device, taking advantage of the integrated full-speed USB 2.0 peripheral. With 24 KB Flash and 2 KB SRAM, it fits a streamlined UAC firmware stack plus small audio buffers; designers can implement a desktop audio dongle that pipes USB isochronous audio to an external DAC via the EUSART or SPI port. The 48 MHz system clock supplies the timing accuracy required for USB isochronous endpoints. Unlike an off-the-shelf audio bridge IC, a PIC18LF2458-based design is fully firmware-customizable for proprietary audio formats or control surfaces.
推薦
Educational Microcontroller Development Platform
The PIC18LF2458-I/SO is widely adopted as a teaching platform for USB and embedded C courses because it combines USB, ADC, timers, and multiple serial interfaces in a single SOIC-28 package with a free MPLAB X IDE toolchain. The 2.0-5.5 V operating range lets students power the board from a USB port or two AA cells, while nanoWatt Sleep mode demonstrations are useful for teaching low-power embedded design. The large 24 KB Flash accommodates student projects that grow through the semester, and the SOIC-28 footprint is breadboard-compatible through breakout boards. Compared with bare ARM Cortex-M boards, the PIC18LF2458 is often the lowest-cost USB-capable teaching platform.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF2458-I/SO — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18F2458-I/SO | PIC18LF2458T-I/SO | PIC18LF2455-I/SO | PIC18LF2455T-I/SO | PIC18LF2423-I/SO | PIC18LF2420-I/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-28 | SOIC-28 (same) | SOIC-28 (same) | SOIC-28 (same) | SOIC-28 (same) | SOIC-28 (same) | SOIC-28 (same) |
| Operating Voltage | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) |
| Flash Memory | 24 KB | 24 KB (same) | 24 KB (same) | 24 KB (same) | 24 KB (same) | 16 KB | 16 KB |
| SRAM | 2 KB | 2 KB (same) | 2 KB (same) | 2 KB (same) | 2 KB (same) | 768 B | 768 B |
| ADC Resolution | 12-bit | 12-bit (same) | 12-bit (same) | 10-bit | 10-bit | 12-bit (same) | 10-bit |
| USB Peripheral | USB 2.0 Full-Speed (12 Mbit/s), on-chip transceiver | USB 2.0 FS (same) | USB 2.0 FS (same) | USB 2.0 FS (same) | USB 2.0 FS (same) | No USB | No USB |
| Operating Temperature | -40 C to +85 C (Industrial) | -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) | -40 C to +85 C (same) |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) | 40 MHz / 10 MIPS |
主要差異化特點
- On-chip USB 2.0 Full-Speed transceiver eliminates external PHY (對比PIC18LF2420-I/SO)
- 12-bit ADC resolution (versus 10-bit on PIC18LF2455 family) (對比PIC18LF2455-I/SO)
- Low-voltage LF range (2.0-5.5 V) versus F variant (4.2-5.5 V) (對比PIC18F2458-I/SO)
設計說明
USB D+ (pin 14, RC5) and D- (pin 13, RC4) traces must be length-matched within 2 mm and routed as a 90-ohm differential pair on the top layer over a continuous ground plane, per USB 2.0 full-speed specification. Keep D+/D- traces short (under 50 mm), avoid right-angle bends, and place the VUSB decoupling capacitor (typically 220 nF to 1 uF) as close to pin 27 (VUSB) as possible. A common-mode choke and ESD protection array (e.g. USBLC6-2) are strongly recommended near the D+/D- entry to the board.
The PIC18LF2458 has a VDD range of 2.0 V to 5.5 V on the LF variant, but the USB peripheral internally requires 3.3 V supplied by the on-chip regulator on VUSB (pin 27). According to the datasheet, VUSB should be bypassed with a 220 nF to 1 uF capacitor and the regulator enabled via the CONFIG register when USB is used. If USB is not used, VUSB may be left open or tied to ground per the device errata. Add bulk decoupling (10 uF + 100 nF) near the VDD/GND pairs (pins 25-26) to support ADC reference stability.
Two common pitfalls: (1) the LF2458 I-V in the SOIC package uses an external 20 MHz or 24 MHz crystal on OSC1/OSC2 (pins 8-9) with the 96 MHz PLL enabled - omitting the PLL gives a 48 MHz bus from a 48 MHz crystal, but USB requires 48 MHz system clock to enumerate. (2) The MCLR pin (pin 1) must be pulled to VDD through a 10 kohm resistor for normal operation; leaving it floating can cause intermittent resets. According to the datasheet, MCLR is shared with RE3 in some configurations - ensure RE3 is not driven when using MCLR reset.
Estimated: at maximum CPU activity (48 MHz, peripherals active, ADC on) the LF2458 typically dissipates around 30-60 mW. With theta_JA around 80-100 C/W for SOIC-28 on a 2-layer 1 oz board, the junction temperature rise above ambient is roughly 3-5 C - well within the industrial 125 C maximum. Thermal management is not a design concern for typical USB HID or sensor-logger applications. If the design uses sleep at high ambient temperature, verify that quiescent current at high temperature is within battery budget.
合規資訊
RoHS compliance and lead-free per SOIC-28 -I/SO ordering code suffix (Microchip ordering system: -I = industrial temperature, /SO = SOIC package, no I = lead-free finish). REACH, halogen-free status not directly stated in the verified web data and marked unknown. Not AEC-Q100 qualified - this part targets industrial and consumer applications, not automotive.
