PIC18LF4458T-I/ML - 48MHz 8-Bit USB MCU 24KB Flash 44-QFN | Microchip
MPN: PIC18LF4458T-I/ML ✓ فعالPIC18LF4458T-I/ML جائزہ
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.
کے لیے ڈراپ اِن متبادل PIC18LF4458T-I/ML — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC18LF4458T-I/ML (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Core Architecture, Operating Temperature, ADC, Timers.
PIC18LF4455T-I/ML
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4450T-I/ML
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4550T-I/ML
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4458-I/ML
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC18LF2458T-I/ML
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC18LF4550-I/ML
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC18LF4458T-I/ML زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| 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) |
| آپریٹنگ درجہ حرارت | -40 C to +85 C (Industrial) |
| پیکیج | 44-QFN (8x8 mm) with Exposed Pad |
| ماؤنٹنگ ٹائپ | Surface Mount |
| RoHS | Compliant (Lead-Free) |
| Packaging | Tape & Reel |
PIC18LF4458T-I/ML پن کنفیگریشن
| پن 1 | RC7/RX/DT/SDO — I/O port C bit 7 / USART RX / I/O |
| پن 2 | RD4 — I/O port D bit 4 |
| پن 3 | RD5 — I/O port D bit 5 |
| پن 4 | RD6 — I/O port D bit 6 |
| پن 5 | RD7 — I/O port D bit 7 |
| پن 6 | VSS — Ground reference |
| پن 7 | VDD — Positive supply (2.0V-5.5V) |
| پن 8 | RB0/INT0 — I/O port B bit 0 / External interrupt 0 |
| پن 9 | RB1/INT1 — I/O port B bit 1 / External interrupt 1 |
| پن 10 | RB2/INT2 — I/O port B bit 2 / External interrupt 2 |
| پن 11 | RB3/CCP2 — I/O port B bit 3 / CCP2 |
| پن 12 | RB4 — I/O port B bit 4 |
| پن 13 | RB5/PGM — I/O port B bit 5 / LVP programming |
| پن 14 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| پن 15 | RB7/PGD — I/O port B bit 7 / ICSP data |
| پن 16 | VUSB3V3 — Internal USB 3.3V regulator output (bypass to GND) |
| پن 17 | VBUS — USB VBUS sensing input (5V from host) |
| پن 18 | D- — USB data minus (differential pair) |
| پن 19 | D+ — USB data plus (differential pair) |
| پن 20 | VDD — Positive supply (2.0V-5.5V) |
| پن 21 | VSS — Ground reference |
| پن 22 | OSC1/CLKIN — Crystal/oscillator input |
| پن 23 | OSC2/CLKOUT — Crystal/oscillator output |
| پن 24 | RA0/AN0 — I/O port A bit 0 / ADC input 0 |
| پن 25 | RA1/AN1 — I/O port A bit 1 / ADC input 1 |
| پن 26 | RA2/AN2/VREF- — I/O port A bit 2 / ADC input 2 / VREF- |
| پن 27 | RA3/AN3/VREF+ — I/O port A bit 3 / ADC input 3 / VREF+ |
| پن 28 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| پن 29 | RA5/AN4/SS — I/O port A bit 5 / ADC input 4 / SPI slave select |
| پن 30 | RE0/AN5 — I/O port E bit 0 / ADC input 5 |
| پن 31 | RE1/AN6 — I/O port E bit 1 / ADC input 6 |
| پن 32 | RE2/AN7 — I/O port E bit 2 / ADC input 7 |
| پن 33 | VDD — Positive supply (2.0V-5.5V) |
| پن 34 | VSS — Ground reference |
| پن 35 | RC0/T1OSO/T1CKI — I/O port C bit 0 / Timer1 oscillator out / Timer1 clock in |
| پن 36 | RC1/T1OSI/CCP2 — I/O port C bit 1 / Timer1 oscillator in / CCP2 |
| پن 37 | RC2/CCP1 — I/O port C bit 2 / CCP1 |
| پن 38 | RC3/SCK/SCL — I/O port C bit 3 / SPI clock / I2C clock |
| پن 39 | RC4/SDI/SDA — I/O port C bit 4 / SPI data in / I2C data |
| پن 40 | RC5/SDO — I/O port C bit 5 / SPI data out |
| پن 41 | RC6/TX/CK — I/O port C bit 6 / USART TX / USART clock |
| پن 42 | RD0 — I/O port D bit 0 |
| پن 43 | RD1 — I/O port D bit 1 |
| پن 44 | RD2 — I/O port D bit 2 |
| پن EP | EP — Exposed thermal pad - tie to GND for thermal dissipation |
عام استعمالات
PIC18LF4458T-I/ML کے لیے موزوں ہے 6 ایپلیکیشنs: 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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC18LF4458T-I/ML — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | 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 |
اہم امتیازی خصوصیات
- Drop-in compatible with PIC18LF4455T-I/ML for cost-down variants (بمقابلہPIC18LF4455T-I/ML)
- Expandable to 32 KB Flash without PCB changes (بمقابلہPIC18LF4550T-I/ML)
- Wide VDD 2.0V-5.5V supports 2xAA battery designs (بمقابلہPIC18F4550-I/P)
ڈیزائن نوٹس
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.
تعمیل کی معلومات
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.