PIC18LF4458-I/PT - 8-Bit 48MHz USB MCU, 24KB Flash | Microchip
MPN: PIC18LF4458-I/PT ✓ Hoạt độngPIC18LF4458-I/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile data memory (RAM), and a rich set of digital and analog peripherals (timers, ADC, communication ports, USB, etc.) on a single silicon die. The PIC18F family sits in Microchip's 8-bit PIC taxonomy above the baseline PIC10/12/16 families, offering higher performance (up to 12 MIPS at 48 MHz), larger memory and the Enhanced Flash architecture with self-programmability. The PIC18LF4458 is the low-voltage 'LF' variant, optimized for operation down to 2.0 V, which makes it suitable for battery-powered or regulated 3.3 V designs.
Key specifications include a 2.0 V to 5.5 V supply range, 34 digital I/O lines, integrated USB 2.0 Full-Speed transceiver, 10-bit ADC, multiple timers, I2C, SPI, USART, and nanoWatt power-management modes that drop current consumption to microampere levels during idle and sleep states. The 'I' suffix denotes an industrial temperature range of -40C to +85C.
The device uses Microchip's Enhanced Harvard RISC architecture with a 16-bit instruction word and 8-bit data path. The 12 MIPS (million instructions per second) throughput at 48 MHz is sufficient for real-time USB class firmware (CDC, HID, MSD), sensor processing, and human-interface control loops. The on-chip 24 KB Enhanced Flash supports self-programming under firmware control, enabling bootloader-based field updates.
Typical applications include USB peripherals (HID keyboards, mice, gamepads, CDC serial adapters), industrial data-acquisition front-ends, home-automation controllers, smart sensors with USB diagnostics ports, and low-cost consumer electronics that need USB connectivity without a dedicated PHY IC. Designers value the LF variant when system rails are already 3.3 V and the USB bus is self- or bus-powered.
When laying out the 44-pin TQFP, place the decoupling capacitors (100 nF plus 4.7 uF bulk) as close as possible to VDD/VSS pairs, route the D+/D- USB pair with 90 ohm differential impedance, and ensure the exposed pad (if present) is soldered to the ground plane for thermal and electrical performance. Always include a 0.1 uF cap on VUSB when the internal USB regulator is used.
This page synthesizes distributor pricing, drop-in compatible alternatives, application notes and design considerations that go beyond what is printed on the Microchip datasheet, helping engineers select the right MCU quickly and avoid common layout pitfalls.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4458-I/PT — 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 PIC18LF4458-I/PT (cùng hình factor và footprint) — khác nhau ở ADC, Core Architecture, Timers, Package, Maximum CPU Frequency.
PIC18LF4455-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF4550-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4458-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh✓ Còn hàng
$9.8438 / Đơn vị
Xem tài liệu →PIC18LF4555-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF4455T-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18LF4458-I/PT Tỷ lệ tối đa & tính chất điện
| Product Family | PIC18F |
| Core Architecture | 8-bit PIC (Enhanced Harvard RISC) |
| CPU Clock Speed | 48 MHz (12 MIPS) |
| Program Memory Type | Enhanced Flash (self-programmable) |
| Program Memory Size | 24 KB (12K x 16 words) |
| Data RAM | 2 KB |
| Data EEPROM | 256 bytes (typical for this family) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Digital I/O Pins | 34 |
| USB Peripheral | USB 2.0 Full-Speed (12 Mbps), internal transceiver |
| ADC | 10-bit, multi-channel (typical for PIC18F445x/455x family) |
| Communication Interfaces | I2C, SPI, USART (Enhanced), USB |
| Timers | Multiple 8-bit and 16-bit timers (typical for family) |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep) |
| Khoảng nhiệt độ hoạt động | -40C to +85C (Industrial, 'I' suffix) |
| Hộp | 44-pin TQFP (PT), 10x10 mm |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (lead-free TQFP) |
Cấu hình chân PIC18LF4458-I/PT
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / digital I/O RE3 |
| Chân 2 | RA0/AN0 — Digital I/O RA0 / analog input AN0 |
| Chân 3 | RA1/AN1 — Digital I/O RA1 / analog input AN1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O RA2 / analog input AN2 / ADC negative reference |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O RA3 / analog input AN3 / ADC positive reference |
| Chân 6 | RA4/T0CKI/C1OUT — Digital I/O RA4 / Timer0 clock input / comparator 1 output |
| Chân 7 | RA5/AN4/SS/HLVDIN/C2OUT — Digital I/O RA5 / analog input AN4 / SPI slave select / HLVD input |
| Chân 8 | OSC2/CLKO/RA6 — Crystal output / clock output / digital I/O RA6 |
| Chân 9 | OSC1/CLKI/RA7 — Crystal input / clock input / digital I/O RA7 |
| Chân 10 | RC0/T1OSO/T1CKI — Digital I/O RC0 / Timer1 oscillator output / Timer1 clock input |
| Chân 11 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | RC1/T1OSI/CCP2 — Digital I/O RC1 / Timer1 oscillator input / CCP2 PWM output |
| Chân 14 | RC2/CCP1 — Digital I/O RC2 / CCP1 PWM output |
| Chân 15 | RC4/D-/VM — USB D- line / digital I/O RC4 / USB VBUS monitor input |
| Chân 16 | RC5/D+/VP — USB D+ line / digital I/O RC5 / USB VBUS power input |
| Chân 17 | VUSB — Internal USB 3.3 V regulator output (decouple with 0.1 uF + 4.7 uF) |
| Chân 18 | RD0/SPP0 — Digital I/O RD0 / Streaming Parallel Port data bit 0 |
| Chân 19 | RD1/SPP1 — Digital I/O RD1 / Streaming Parallel Port data bit 1 |
| Chân 20 | RD2/SPP2 — Digital I/O RD2 / Streaming Parallel Port data bit 2 |
| Chân 21 | RD3/SPP3 — Digital I/O RD3 / Streaming Parallel Port data bit 3 |
| Chân 22 | RC6/TX/CK — Digital I/O RC6 / USART TX / USART clock |
| Chân 23 | RC7/RX/DT — Digital I/O RC7 / USART RX / USART data |
| Chân 24 | RD4/SPP4 — Digital I/O RD4 / Streaming Parallel Port data bit 4 |
| Chân 25 | RD5/SPP5 — Digital I/O RD5 / Streaming Parallel Port data bit 5 |
| Chân 26 | RD6/SPP6 — Digital I/O RD6 / Streaming Parallel Port data bit 6 |
| Chân 27 | RD7/SPP7 — Digital I/O RD7 / Streaming Parallel Port data bit 7 |
| Chân 28 | VSS — Ground reference |
| Chân 29 | RB0/AN12/INT0/FLT0 — Digital I/O RB0 / analog input AN12 / external interrupt 0 / PWM fault input |
| Chân 30 | RB1/AN10/INT1 — Digital I/O RB1 / analog input AN10 / external interrupt 1 |
| Chân 31 | RB2/AN8/INT2/VMO — Digital I/O RB2 / analog input AN8 / external interrupt 2 / SPP VMO |
| Chân 32 | RB3/AN9/CCP2/VPO — Digital I/O RB3 / analog input AN9 / CCP2 / SPP VPO |
| Chân 33 | RB4/AN11/KBI0 — Digital I/O RB4 / analog input AN11 / interrupt-on-change KBI0 |
| Chân 34 | RB5/KBI1/PGM — Digital I/O RB5 / interrupt-on-change KBI1 / LVP programming |
| Chân 35 | RB6/KBI2/PGC — Digital I/O RB6 / interrupt-on-change KBI2 / ICSP clock |
| Chân 36 | RB7/KBI3/PGD — Digital I/O RB7 / interrupt-on-change KBI3 / ICSP data |
| Chân 37 | RE0/RD — Digital I/O RE0 / Parallel Port read control |
| Chân 38 | RE1/WR — Digital I/O RE1 / Parallel Port write control |
| Chân 39 | RE2/CS — Digital I/O RE2 / Parallel Port chip select |
| Chân 40 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Chân 41 | VSS — Ground reference |
| Chân 42 | RC3/SCK/SCL — Digital I/O RC3 / SPI clock / I2C clock |
| Chân 43 | RC4/D-/VM — USB D- line (alternate pin) |
| Chân 44 | RC5/D+/VP — USB D+ line (alternate pin) |
Ứng dụng tiêu biểu
PIC18LF4458-I/PT phù hợp cho 6 Áp dụngs: USB HID Peripherals (Keyboard, Mouse, Gamepad), USB-to-UART (CDC) Bridge Adapters, Industrial Data-Acquisition Front-End, Home-Automation Controllers, Consumer Electronics with USB Diagnostics Port, USB Mass-Storage (MSD) Bootloader Devices.
USB HID Peripherals (Keyboard, Mouse, Gamepad)
The PIC18LF4458-I/PT is a strong fit for USB HID class peripherals because its integrated USB 2.0 Full-Speed transceiver eliminates an external PHY and its 48 MHz / 12 MIPS core handles HID polling plus key-matrix or quadrature decoding in real time. The 24 KB Enhanced Flash fits Microchip's free USB stack (CDC, HID, MSD) plus application code, while 2 KB SRAM comfortably holds HID report buffers and protocol state. Operated at 3.3 V from the USB VBUS rail, the LF variant avoids a 5 V regulator, simplifying bus-powered designs. Performance consideration: USB interrupt latency on PIC18F is typically < 5 us at 48 MHz, well within the 1 ms USB frame budget.
Được đề xuất
USB-to-UART (CDC) Bridge Adapters
The PIC18LF4458-I/PT works well as a USB CDC bridge that presents a virtual COM port to the host and converts it to UART on the application side. The on-chip USART (Enhanced) supports up to 5 Mbps, the USB Full-Speed endpoint RAM buffers up to 64-byte packets, and the 48 MHz core runs Microchip's CDC stack without taxing CPU budget. Engineers commonly use this for debugging embedded targets, programming FPGAs over JTAG-to-UART bridges, or replacing legacy RS-232 ports. Performance consideration: at 48 MHz the CDC-to-UART throughput saturates at the UART baud rate (typically 921600 bps to 1 Mbps), with negligible CPU overhead.
Được đề xuất
Industrial Data-Acquisition Front-End
In industrial data-acquisition front-ends, the PIC18LF4458-I/PT samples analog signals with its 10-bit ADC, pre-processes data in firmware, and streams results over USB to a host PC for logging. The industrial -40C to +85C temperature rating supports factory-floor deployment, the nanoWatt sleep modes reduce quiescent current below 1 uA for battery-backed sensors, and the LF voltage range (2.0 V to 5.5 V) accepts directly regulated 3.3 V or 5 V rails. Performance consideration: the 10-bit ADC at 48 MHz clock supports up to ~100 ksps, sufficient for vibration, temperature, and pressure sensors in industrial monitoring.
Được đề xuất
Home-Automation Controllers
The PIC18LF4458-I/PT fits home-automation hubs that need a USB diagnostic/configuration port plus on-board logic for relays, sensors, and wireless modules. Its 34 I/O pins drive multi-channel relay boards or interface with NRF24L01 / LoRa modules over SPI, while the USB port serves as a service-port for firmware update and configuration from a PC. The 3.3 V operation aligns with modern wireless modules, eliminating level shifters. Performance consideration: at 48 MHz the MCU can poll multiple sensor streams and respond to USB control transfers concurrently without dropping USB frames, making it suitable for always-on home gateways.
Được đề xuất
Consumer Electronics with USB Diagnostics Port
In consumer electronics such as toys, fitness devices and small appliances, the PIC18LF4458-I/PT serves as the main MCU and exposes a USB port for factory calibration, firmware updates and field diagnostics. Its low BOM cost (integrated USB, internal oscillator option) reduces part count, the 2 KB RAM holds temporary diagnostic buffers, and the Enhanced Flash supports bootloader-based field updates via USB. Performance consideration: the bootloader portion typically uses < 4 KB Flash, leaving the remainder for application code. LF operation at 3.3 V suits direct Li-ion battery connection via an LDO.
Được đề xuất
USB Mass-Storage (MSD) Bootloader Devices
The PIC18LF4458-I/PT can act as a USB MSD bootloader host or device that appears as a removable drive to a PC, dragging-and-dropping new firmware images. The internal Flash supports self-programming, the 24 KB space accommodates a FAT12/16 MSD stack plus bootloader, and the USB Full-Speed peripheral provides the required Bulk-Only Transport endpoint. Performance consideration: writing 16 KB to internal Flash takes ~1 second at typical row-write rates, so end users see only a brief disconnect during firmware update - acceptable for hobbyist and prosumer applications.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4458-I/PT — 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 | PIC18LF4455-I/PT | PIC18LF4550-I/PT | PIC18F4458-I/PT | PIC18LF4555-I/PT | PIC18LF4455T-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT), 10x10 mm | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same | 44-TQFP (PT), 10x10 mm - same |
| Core / CPU Clock | 8-bit PIC18F, 48 MHz | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same | 8-bit PIC18F, 48 MHz - same |
| Flash Memory | 24 KB | 24 KB | 32 KB | 24 KB | 48 KB | 24 KB |
| RAM | 2 KB | 2 KB - same | 2 KB - same | 2 KB - same | 2 KB - same | 2 KB - same |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V - same | 2.0 V to 5.5 V - same | 4.2 V to 5.5 V | 2.0 V to 5.5 V - same | 2.0 V to 5.5 V - same |
| USB Peripheral | USB 2.0 Full-Speed, integrated | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same | USB 2.0 Full-Speed, integrated - same |
| I/O Pins | 34 | 34 - same | 34 - same | 34 - same | 34 - same | 34 - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same |
| Approximate Unit Price (qty 1000) | USD 4.10 (as of 2026-09-28) | USD ~3.95 (as of 2026-09-28) | USD ~4.50 (as of 2026-09-28) | USD ~4.20 (as of 2026-09-28) | USD ~5.10 (as of 2026-09-28) | USD ~3.95 (tape-and-reel, as of 2026-09-28) |
Bảo phân biệt quan trọng
- LF variant supports 2.0 V to 5.5 V operation, ideal for 3.3 V-only USB designs (vsPIC18F4458-I/PT)
- 24 KB Flash is sized for cost-sensitive USB HID / CDC designs (vsPIC18LF4550-I/PT)
- Integrated USB 2.0 Full-Speed transceiver eliminates external PHY (vsPIC18LF2550-I/SP (28-pin))
- Industrial -40C to +85C temperature rating (vsConsumer-grade MCU alternatives)
Ghi chú thiết kế
Route the USB D+ (pin 16) and D- (pin 15) differential pair with 90 ohm differential impedance, length-matched within 2 mm, and place the VUSB decoupling capacitor (0.1 uF ceramic plus 4.7 uF bulk) within 3 mm of the VUSB pin. The D+/D- traces should be kept away from clock and switching signals to minimize radiated EMI on the USB bus. Refer to Microchip AN612 - PCB Design Guidelines for USB 2.0 for a complete checklist.
Place a 0.1 uF ceramic decoupling capacitor on each VDD pin (11, 32) and each AVVD/VSS pair, with the capacitor loop area kept under 25 mm^2 to minimize inductance. The PIC18LF4458's internal USB 3.3 V regulator requires VUSB decoupling to meet USB suspend current specifications; without proper decoupling the regulator may oscillate and cause USB enumeration failures. Estimated: total bulk capacitance budget is ~10 uF across VDD rails for reliable USB operation at full speed.
Do not connect MCLR (pin 1) directly to VDD without a 10 kohm pull-up resistor and 100 nF capacitor to ground for proper reset behavior. Always configure the CONFIG words (especially the oscillator, watchdog and brown-out settings) before code execution; failure to do so is the most common reason prototypes refuse to start. For low-voltage (LF) operation below 3.0 V, ensure the BOR (Brown-Out Reset) voltage is configured for the appropriate trip point.
When using the on-chip USB transceiver in low-speed mode (1.5 Mbps), the D- line has an internal pull-up that may interfere with low-power sleep modes; configure the UPUEN bit appropriately before entering sleep. For Full-Speed USB, ensure the internal 96 MHz PLL is locked (check the USB PLL lock status bit) before USB transactions to avoid framing errors.
The 44-pin TQFP package has a typical theta_JA of ~50 C/W in still air, so thermal management is rarely a concern for USB MCU applications where typical power consumption is below 50 mW. However, in industrial enclosures with no airflow, derate by ~20% from the datasheet maximum ratings. The PIC18LF4458 LF variant dissipates less power than the F variant at equivalent clock speeds due to the lower core voltage.
Thông tin tuân thủ
Lead-free TQFP package per Microchip product page. Not AEC-Q100 qualified - this is a general-purpose MCU; automotive designs should use the AEC-Q100-qualified PIC18F variants in the same family. RoHS and REACH compliant per Microchip environmental documentation.