PIC18LF4458T-I/ML - 48MHz 8-Bit USB MCU 24KB Flash 44-QFN | Microchip
MPN: PIC18LF4458T-I/ML ✓ Hoạt độngPIC18LF4458T-I/ML Tóm tắt
A PIC18 microcontroller is an 8-bit reduced-instruction-set computing (RISC) engine using a modified Harvard architecture with separate program and data buses; the PIC18 family specifically adds 16-bit instructions, hardware multiply, and a C-optimized instruction set that bridges legacy 8-bit code with modern C compilers. Within Microchip's hierarchy, PIC18 sits between baseline PIC10/12/16 and the 16-bit dsPIC/PIC24 families, targeting mid-range embedded USB, sensing, and human-interface applications where deterministic real-time response and low cost matter more than raw MIPS.
Key features of the PIC18LF4458T-I/ML include a full-speed USB 2.0 FS transceiver with on-chip 3.3V regulator and 1.5 kB of endpoint RAM; a 12-channel 10-bit ADC with auto-acquisition; two USARTs, one SPI, and one I2C (Master/Slave); a 16-bit timer/counter plus two 8-bit timers; a 9-channel 10-bit PWM module; nanoWatt power management with multiple idle/sleep modes; and 34 digital I/O pins tolerant of 5V logic on a VDD-Domain digital supply.
Architecturally, the device integrates an internal 8 MHz oscillator with a 4x PLL (yielding the 48 MHz FOSC) and supports crystal, resonator, and external clock sources. The 24 KB Flash is partitioned for a 32 KB bootloader-compatible region, while the 2 KB SRAM supports USB endpoint buffer allocation. The exposed pad (EP) of the QFN-44 must be soldered to a sufficient ground copper pour to meet the 31 C/W theta-JC thermal envelope; otherwise the silicon will fold back oscillator activity when junction temperature exceeds 150C.
Typical applications include USB Human Interface Devices (HID keyboards, mice, game controllers), CDC virtual COM ports, low-speed instrumentation bridges, industrial sensor nodes with USB firmware update, and legacy serial-port-to-USB migration designs. Industrial-grade temperature and wide VDD also suit process-control front ends and battery-backed accessories.
Design tip: route the USB D+/D- pair as a 90-ohm differential, place the VBUS-sense resistor within 5 mm of the VBUS pin, and tie the exposed pad to a continuous GND pour. For EMI-sensitive links, the internal 3.3V USB regulator should be bypassed with 1 uF X7R plus 100 nF at the pin.
This page consolidates distributor pricing, drop-in alternatives, and practical design guidance beyond what is found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF4458T-I/ML — 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 PIC18LF4458T-I/ML (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Operating Temperature, ADC, Timers.
PIC18LF4455T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4450T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4550T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4458-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF2458T-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF4550-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4458T-I/ML Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit (Harvard, RISC) |
| Family | PIC18F |
| Core Frequency | 48 MHz (12 MIPS) |
| Program Memory | 24 KB Flash (12K x 16) |
| Data Memory (SRAM) | 2 KB |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| USB | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver + 3.3V LDO |
| Timers | 1 x 16-bit, 2 x 8-bit |
| Communication | 2x USART, 1x SPI, 1x I2C (M/S) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-QFN (8x8 mm) with Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| RoHS | Compliant (Lead-Free) |
| Packaging | Tape & Reel |
Cấu hình chân PIC18LF4458T-I/ML
| Chân 1 | RC7/RX/DT/SDO — I/O port C bit 7 / USART RX / I/O |
| Chân 2 | RD4 — I/O port D bit 4 |
| Chân 3 | RD5 — I/O port D bit 5 |
| Chân 4 | RD6 — I/O port D bit 6 |
| Chân 5 | RD7 — I/O port D bit 7 |
| Chân 6 | VSS — Ground reference |
| Chân 7 | VDD — Positive supply (2.0V-5.5V) |
| Chân 8 | RB0/INT0 — I/O port B bit 0 / External interrupt 0 |
| Chân 9 | RB1/INT1 — I/O port B bit 1 / External interrupt 1 |
| Chân 10 | RB2/INT2 — I/O port B bit 2 / External interrupt 2 |
| Chân 11 | RB3/CCP2 — I/O port B bit 3 / CCP2 |
| Chân 12 | RB4 — I/O port B bit 4 |
| Chân 13 | RB5/PGM — I/O port B bit 5 / LVP programming |
| Chân 14 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| Chân 15 | RB7/PGD — I/O port B bit 7 / ICSP data |
| Chân 16 | VUSB3V3 — Internal USB 3.3V regulator output (bypass to GND) |
| Chân 17 | VBUS — USB VBUS sensing input (5V from host) |
| Chân 18 | D- — USB data minus (differential pair) |
| Chân 19 | D+ — USB data plus (differential pair) |
| Chân 20 | VDD — Positive supply (2.0V-5.5V) |
| Chân 21 | VSS — Ground reference |
| Chân 22 | OSC1/CLKIN — Crystal/oscillator input |
| Chân 23 | OSC2/CLKOUT — Crystal/oscillator output |
| Chân 24 | RA0/AN0 — I/O port A bit 0 / ADC input 0 |
| Chân 25 | RA1/AN1 — I/O port A bit 1 / ADC input 1 |
| Chân 26 | RA2/AN2/VREF- — I/O port A bit 2 / ADC input 2 / VREF- |
| Chân 27 | RA3/AN3/VREF+ — I/O port A bit 3 / ADC input 3 / VREF+ |
| Chân 28 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Chân 29 | RA5/AN4/SS — I/O port A bit 5 / ADC input 4 / SPI slave select |
| Chân 30 | RE0/AN5 — I/O port E bit 0 / ADC input 5 |
| Chân 31 | RE1/AN6 — I/O port E bit 1 / ADC input 6 |
| Chân 32 | RE2/AN7 — I/O port E bit 2 / ADC input 7 |
| Chân 33 | VDD — Positive supply (2.0V-5.5V) |
| Chân 34 | VSS — Ground reference |
| Chân 35 | RC0/T1OSO/T1CKI — I/O port C bit 0 / Timer1 oscillator out / Timer1 clock in |
| Chân 36 | RC1/T1OSI/CCP2 — I/O port C bit 1 / Timer1 oscillator in / CCP2 |
| Chân 37 | RC2/CCP1 — I/O port C bit 2 / CCP1 |
| Chân 38 | RC3/SCK/SCL — I/O port C bit 3 / SPI clock / I2C clock |
| Chân 39 | RC4/SDI/SDA — I/O port C bit 4 / SPI data in / I2C data |
| Chân 40 | RC5/SDO — I/O port C bit 5 / SPI data out |
| Chân 41 | RC6/TX/CK — I/O port C bit 6 / USART TX / USART clock |
| Chân 42 | RD0 — I/O port D bit 0 |
| Chân 43 | RD1 — I/O port D bit 1 |
| Chân 44 | RD2 — I/O port D bit 2 |
| Chân EP | EP — Exposed thermal pad - tie to GND for thermal dissipation |
Ứng dụng tiêu biểu
PIC18LF4458T-I/ML phù hợp cho 6 Áp dụngs: USB HID Peripherals (Keyboard, Mouse, Game Controller), USB CDC Virtual COM Port Bridge, Industrial Sensor Node with USB Diagnostics, Battery-Powered USB Charging Cable Identity Dongle, USB Bootloader / Field Firmware Update Target, Legacy RS-232 to USB Migration Adapter.
USB HID Peripherals (Keyboard, Mouse, Game Controller)
The PIC18LF4458T-I/ML is purpose-built for USB Human Interface Devices because it integrates a full-speed USB 2.0 transceiver, 1.5 KB endpoint RAM, and an internal 3.3V LDO that draws power directly from VBUS - eliminating the need for an external PHY or regulator. Its 48 MHz core delivers 12 MIPS, enough to scan matrix keybeds at >1 kHz while still serving the USB 1 ms polling interval. The 2.0V-5.5V VDD lets the same board power from a 2-cell Li-ion pack or USB 5V rail. Place a 90-ohm D+/D- differential pair, a 1.5 kohm pull-up on D+, and tie the exposed pad to GND; the bootloader HID descriptor can reflash the 24 KB Flash over USB without an external programmer.
Được đề xuất
USB CDC Virtual COM Port Bridge
The PIC18LF4458T-I/ML is widely used in USB-to-UART bridge designs replacing legacy RS-232 adapters. Its integrated USB FS transceiver plus a CDC class-compliant firmware stack (Microchip MLA) lets the device enumerate as a virtual COM port on Windows, macOS, and Linux without driver installation. The 48 MHz core drives CDC at 921600 baud with negligible CPU load, while the 2 KB SRAM buffers USB OUT packets without overflow. Place a 1 uF X7R bypass on VUSB3V3 and route D+/D- as a 90-ohm differential; this is sufficient to replace FTDI-style bridges at lower cost while keeping a single-IC BOM. Suitable for industrial sensor readout, debug consoles, and firmware update channels.
Được đề xuất
Industrial Sensor Node with USB Diagnostics
The PIC18LF4458T-I/ML fits industrial sensor-front-end designs that need both 5V analog sensor excitation and a USB maintenance port. The 2.0V-5.5V VDD range lets a 24V-to-5V LDO (e.g., LM7805) power the MCU directly while the on-chip ADC reads process variables. The 34 I/O pins support SPI/I2C sensor clusters, and the USB port enables field technicians to attach a laptop for live diagnostics and firmware updates. Industrial -40C to +85C rating suits factory floor operation. The exposed pad must be soldered to a continuous GND pour for thermal dissipation; failed pads are the #1 cause of field returns on QFN packages.
Được đề xuất
Battery-Powered USB Charging Cable Identity Dongle
The PIC18LF4458T-I/ML's nanoWatt idle modes and 2.0V minimum VDD make it suitable for USB cable identity dongles that announce negotiated current to phones. Drawing <1 uA in sleep, the device wakes on VBUS attach, enumerates as a HID or vendor device, and reports cable ratings to the charging host. The 24 KB Flash stores firmware and cable-descriptor look-up tables, while 2 KB SRAM holds USB endpoint buffers. Place the device directly across the USB D+/D- lines with 15 kohm pulldowns, use a 47 nF VBUS decoupling cap, and ensure the exposed pad grounds to dissipate any hot-plug inrush.
Được đề xuất
USB Bootloader / Field Firmware Update Target
The PIC18LF4458T-I/ML includes a self-programmable Flash region that Microchip's USB bootloader (HID-class) can target for in-field firmware updates. A 32 KB bootloader region fits entirely inside the 24 KB Flash budget of the 4458 when paired with a smaller application, or the higher-Flash 4450/4550 variants can host both the bootloader and a larger app. This eliminates the need for ICSP headers on production PCBs. Route D+/D- with 90-ohm differential, add ESD protection diodes to VBUS, and use Microchip's HID Bootloader PC host tool to push HEX files. Power comes directly from USB VBUS - no external LDO needed.
Được đề xuất
Legacy RS-232 to USB Migration Adapter
The PIC18LF4458T-I/ML is used to migrate legacy RS-232 designs to USB by replacing the DE-9 connector and line driver with a USB CDC bridge on the same PCB. The 48 MHz core bit-bangs RS-232 at up to 115200 baud while managing the USB endpoint; an external MAX3232 converts to +/-6V logic if true RS-232 levels are required for legacy peripherals. The 2 KB SRAM buffers CDC transfers at line rate, and the exposed-pad QFN-44 keeps the BOM compact for dongle-style adapters. Suitable for industrial PLC programming cables, label printers, and POS terminals.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF4458T-I/ML — 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 | PIC18LF4455T-I/ML | PIC18LF4450T-I/ML | PIC18LF4550T-I/ML | PIC18LF4458-I/ML | PIC18LF2458T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8 mm) with EP | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Core Frequency | 48 MHz (12 MIPS) | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Program Flash | 24 KB | 24 KB (same) | 32 KB (+33%) | 32 KB (+33%) | 24 KB (same) | 24 KB (same) |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 24 (-29%) |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| USB FS | Yes (integrated) | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tube | Tape & Reel |
Bảo phân biệt quan trọng
- Drop-in compatible with PIC18LF4455T-I/ML for cost-down variants (vsPIC18LF4455T-I/ML)
- Expandable to 32 KB Flash without PCB changes (vsPIC18LF4550T-I/ML)
- Wide VDD 2.0V-5.5V supports 2xAA battery designs (vsPIC18F4550-I/P)
Ghi chú thiết kế
The 44-QFN (8x8 mm) exposed pad (EP) MUST be soldered to a continuous GND copper pour spanning at least 2 square inches of board copper. Per the Microchip PIC18F4458 family datasheet, a floating or undersized EP increases junction-to-ambient thermal resistance above the 31 C/W budget and causes oscillator fold-back or erratic reset behavior. Place 25-30 thermal vias (0.3 mm drill, 0.6 mm pitch) inside the EP region stitched to the bottom-layer GND plane for optimal heat extraction.
Route the USB D+ and D- pair as a 90-ohm differential (each trace 0.20 mm wide on 0.20 mm spacing for 1.6 mm FR-4), matching length to within 2 mm, and shield with a continuous GND pour on both sides with stitched vias. Place the ESD protection diodes within 5 mm of the USB connector. The 1.5 kohm pull-up on D+ selects full-speed USB; place this resistor as close to the D+ pin as possible to avoid impedance discontinuities. Source: Microchip PIC18F4458 family datasheet, USB section.
The internal USB 3.3V regulator (VUSB3V3 pin) must be bypassed with a 1 uF X7R ceramic plus a 100 nF NP0/C0G in parallel, placed within 3 mm of the pin. This internal regulator sources current from VBUS and powers the USB transceiver; if VBUS is absent (self-powered designs) the regulator is disabled and the device falls back to VDD for the USB PHY. Never short VUSB3V3 to VDD - the regulator is for USB PHY only.
Configuration word programming: the CONFIG1L register's PLLDIV bits must be set to divide-by-5 (96 MHz -> 48 MHz USB clock) for correct USB operation with the 20 MHz crystal mode - misprogramming the PLL configuration yields a 24 MHz USB clock and enumerates as low-speed USB, not full-speed. Also note: the 'F' vs 'LF' VDD range selection must match VDD - applying 5V to a PIC18F4458 (which expects 4.2V-5.5V max) is fine, but a 3.3V supply to PIC18F4458 fails start-up.
Thông tin tuân thủ
RoHS compliant per Microchip product page (verified 2026-09-28). Industrial temperature -40C to +85C. Not AEC-Q100 qualified; choose AEC-Q100 qualified PIC18 variants for automotive.