PIC18LF4585T-I/ML - 48KB Flash, USB/ECAN 8-bit MCU | Microchip
MPN: PIC18LF4585T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.65 | $9.65 |
| 10 | $8.71 | $87.10 |
| 100 | $7.62 | $762.00 |
| 500 | $6.45 | $3,225.00 |
| 1,000 | $5.83 | $5,830.00 |
PIC18LF4585T-I/ML Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (typically Flash), volatile data memory (SRAM), and a rich set of peripherals (timers, ADC, communication controllers, GPIOs). The PIC18 family sits inside Microchip's 8-bit portfolio and traces back through 16-bit PIC24 and dsPIC, then up to the broader hierarchy of microcontroller -> embedded processor -> semiconductor. The "LF" prefix denotes a low-voltage (2.0V-5.5V) variant, while "F" denotes standard-voltage 4.2V-5.5V; "4585" identifies the specific die featuring ECAN, USB, and 10-bit ADC.
Key differentiating features of the PIC18LF4585T-I/ML include 48 KB Flash / 3328 B SRAM, integrated USB 2.0 full-speed with on-chip transceiver, ECAN controller supporting CAN 2.0B, 10-bit ADC with up to 13 input channels, two capture/compare/PWM modules, two USART modules, an SPI/I2C MSSP peripheral, nanoWatt Technology dynamic power management, and a 16-bit wide instruction set with 8-bit data path optimized for C-compiled code. The industrial temperature grade supports harsh-environment designs.
The architecture is a Harvard RISC core with separate program and data buses, allowing instruction fetch and data access to occur in a single 4-clock cycle. nanoWatt Technology provides multiple idle and sleep modes, with current draw as low as microamps in deep sleep - extending battery life for portable and remote nodes.
Typical applications include USB peripherals, CAN-based automotive and industrial node ECUs, sensor aggregation gateways, embedded-control LED for specialty lighting, and a backplane of PLC and metering controllers where USB diagnostics ports are needed alongside CAN fieldbus connectivity.
When designing with this device, place the exposed pad (EP) of the QFN-44 to a thermally and electrically continuous ground plane - the EP must be soldered to PCB copper for thermal dissipation, EMI grounding, and signal integrity. Use a 0.1 uF ceramic bypass on VDD close to each supply pin and a 4.7-10 uF bulk cap on the regulator output feeding the MCU rail.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet - giving a procurement and engineering reference in one place.
Drop-in alternatives for PIC18LF4585T-I/ML — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18LF4585T-I/ML (same form factor and footprint) — differing in Package, Timers, Program Memory (Flash), Operating Temperature, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF4585-I/ML
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC18F4585T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4585-I/PT
✅ Drop-In✓ In Stock
$6.34 / Unit
View Datasheet →PIC18LF4580T-I/PT
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC18LF4553-I/ML
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC18F4550-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4480T-I/ML
✅ Drop-In✓ In Stock
$4.72 / Unit
View Datasheet →PIC18LF4585T-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Program Memory (Flash) | 48 KB |
| Data Memory (SRAM) | 3328 B |
| Maximum Clock Frequency | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| Package | QFN-44 (8 x 8 mm) with exposed pad |
| Operating Temperature | -40 C to +85 C (Industrial) |
| USB Peripheral | USB 2.0 Full-Speed with on-chip transceiver |
| CAN Peripheral | ECAN (Enhanced CAN 2.0B) |
| ADC | 10-bit, up to 13 channels |
| Timers | 4 (Timer0/1/2/3) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Communication | 2x USART, 1x MSSP (SPI/I2C), USB, ECAN |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep) |
| ROM Type | Flash |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (LEAD FREE, PLASTIC per datasheet) |
PIC18LF4585T-I/ML Pin Configuration
| Pin 1 | RB5/KBI1/PGM — PORTB I/O bit 5 / Keyboard Interrupt 1 / LVP programming |
| Pin 2 | RB4/KBI0 — PORTB I/O bit 4 / Keyboard Interrupt 0 |
| Pin 3 | RB3/CCP2 — PORTB I/O bit 3 / Capture/Compare/PWM 2 |
| Pin 4 | RB2/CCP1 — PORTB I/O bit 2 / Capture/Compare/PWM 1 |
| Pin 5 | RB1/INT1 — PORTB I/O bit 1 / External Interrupt 1 |
| Pin 6 | RB0/INT0/FLT0 — PORTB I/O bit 0 / External Interrupt 0 / PWM Fault |
| Pin 7 | VSS — Ground |
| Pin 8 | VDD — Positive supply (2.0V-5.5V) |
| Pin 9 | RC7/RX1/DT1 — PORTC bit 7 / USART1 RX / Sync data |
| Pin 10 | RC6/TX1/CK1 — PORTC bit 6 / USART1 TX / Sync clock |
| Pin 11 | RC5/D+/VP — PORTC bit 5 / USB D+ / ADC VREF+ |
| Pin 12 | RC4/D-/VM — PORTC bit 4 / USB D- / ADC VREF- |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI SCK / I2C SCL |
| Pin 14 | RC2/SDO — PORTC bit 2 / SPI SDO |
| Pin 15 | RC1/SDI/SDA — PORTC bit 1 / SPI SDI / I2C SDA |
| Pin 16 | RC0/T0CKI — PORTC bit 0 / Timer0 clock input |
| Pin 17 | OSC2/CLKO/RA6 — Crystal out / System clock out / PORTA bit 6 |
| Pin 18 | OSC1/CLKI/RA7 — Crystal in / System clock in / PORTA bit 7 |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply (2.0V-5.5V) |
| Pin 21 | RA0/AN0/CVREF — PORTA bit 0 / ADC AN0 / Comparator VREF |
| Pin 22 | RA1/AN1 — PORTA bit 1 / ADC AN1 |
| Pin 23 | RA2/AN2/VREF- — PORTA bit 2 / ADC AN2 / VREF- |
| Pin 24 | RA3/AN3/VREF+ — PORTA bit 3 / ADC AN3 / VREF+ |
| Pin 25 | RA4/T0CKI/C1OUT — PORTA bit 4 / T0 clock in / Comparator 1 out |
| Pin 26 | RA5/AN4/SS/HLVDIN/C2OUT — PORTA bit 5 / ADC AN4 / SPI SS / HLVD input / Comparator 2 out |
| Pin 27 | RE3/RD — PORTE bit 3 / Read control (parallel slave) |
| Pin 28 | RE2/CS — PORTE bit 2 / Chip select (parallel slave) |
| Pin 29 | RE1/WR — PORTE bit 1 / Write control (parallel slave) |
| Pin 30 | RE0/RD/AN5 — PORTE bit 0 / Read control / ADC AN5 |
| Pin 31 | RD7 — PORTD bit 7 |
| Pin 32 | RD6 — PORTD bit 6 |
| Pin 33 | RD5 — PORTD bit 5 |
| Pin 34 | RD4 — PORTD bit 4 |
| Pin 35 | CANTX — ECAN transmit output |
| Pin 36 | CANRX — ECAN receive input |
| Pin 37 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port 3 |
| Pin 38 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port 2 |
| Pin 39 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port 1 |
| Pin 40 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port 0 |
| Pin 41 | VSS — Ground |
| Pin 42 | VDD — Positive supply (2.0V-5.5V) |
| Pin 43 | RB7/KBI3/PGD — PORTB bit 7 / KBI3 / ICSP data |
| Pin 44 | RB6/KBI2/PGC — PORTB bit 6 / KBI2 / ICSP clock |
| Pin 45 | EP — Exposed pad - must be soldered to PCB ground for thermal dissipation |
Typical Applications
PIC18LF4585T-I/ML is suitable for 6 applications: USB Human Interface Devices (HID), CAN-Bus Industrial Sensor Nodes, Automotive Body and Comfort ECUs, Battery-Powered Data Loggers, USB-CAN Bridge / Protocol Gateway, Industrial LED Lighting Controllers.
USB Human Interface Devices (HID)
The PIC18LF4585T-I/ML's integrated USB 2.0 Full-Speed peripheral with on-chip transceiver makes it well suited to USB HID peripherals such as keyboards, mice, custom control panels, and industrial USB dongles. Its 48 KB Flash comfortably holds the Microchip USB stack plus HID class descriptors and application logic, while 3328 B of SRAM handles HID report buffers. Compared with external-phy designs, the on-chip transceiver eliminates a dedicated USB chip, reducing BOM cost and PCB area. The 48 MHz core (12 MIPS) is fast enough for debounced button scanning and report-rate-limited transmission. Operating from 2.0V-5.5V also lets the same firmware serve both 3.3V and 5V USB environments.
Recommended
CAN-Bus Industrial Sensor Nodes
With ECAN 2.0B support, 13-channel 10-bit ADC, and 2.0V-5.5V operation, the PIC18LF4585T-I/ML is a natural fit for CAN-based industrial sensor nodes and PLC I/O modules. The on-chip ECAN controller accepts CAN 2.0B extended frames and offers acceptance filters, so engineers pair the device with an external CAN transceiver (MCP2551/MCP2562). The 48 KB Flash accommodates CANopen or DeviceNet dictionaries alongside sensor-conditioning code. nanoWatt Technology sleep currents below 1 uA extend battery-backed nodes. The QFN-44 footprint is compact enough for DIN-rail sensor heads and remote telemetry units.
Recommended
Automotive Body and Comfort ECUs
The PIC18LF4585T-I/ML is well matched to non-safety automotive body controllers such as HVAC panels, seat controllers, ambient lighting, and door modules that require LIN/CAN connectivity plus a service-mode USB diagnostic port. Its 34 GPIO pins drive multiple loads via BJTs/MOSFETs, while the on-chip ECAN and USB allow the same MCU to talk to the vehicle CAN bus and to a service tool over USB. The -40C to +85C industrial temperature range covers cabin environments. Designers pair the device with CAN transceivers and LIN transceivers (MCP2003) to build a complete body-control ECU on a 5x2 inch PCB.
Recommended
Battery-Powered Data Loggers
The 2.0V minimum supply of the PIC18LF4585T-I/ML allows operation directly from two alkaline cells down to 2.0 V end-of-life, eliminating boost regulators and saving quiescent current in portable data loggers. The on-chip 10-bit ADC digitizes sensor inputs (temperature, pressure, flow) into the 3328-byte SRAM, which is buffered in chunks before USB offload. nanoWatt Technology sleep currents under 1 uA extend mission life on a single battery pack; periodic wake-up via Watchdog Timer or RTCC handles sample timing. This combination of low-Vin and integrated USB simplifies the design of hand-held field loggers.
Recommended
USB-CAN Bridge / Protocol Gateway
Because the PIC18LF4585T-I/ML integrates both USB 2.0 Full-Speed and ECAN, it serves as a one-chip USB-to-CAN bridge or protocol gateway between a host PC and a CAN bus. Engineering teams use this topology to log CAN traffic, flash ECU firmware, or visualize automotive sensor data on USB. 48 KB Flash is enough to host CDC+ECAN firmware with command parser, and 48 MHz (12 MIPS) handles 1 Mbps CAN traffic without back-pressure. The QFN-44 footprint plus integrated peripherals mean a complete bridge is implementable on a 30x40 mm dongle PCB.
Recommended
Industrial LED Lighting Controllers
The PIC18LF4585T-I/ML's 2 CCP modules generate PWM channels for driving LED strings and RGB color-mixing fixtures, while the 10-bit ADC reads photodiodes for closed-loop brightness control. The 2.0V-5.5V supply range allows direct operation from 24V-bus-derived rails. The 34 GPIO pins multiplex button inputs, fan PWM, and DMX-style serial control via one of the USARTs. nanoWatt sleep reduces standby power for always-on fixtures to meet energy-efficiency regulations, and the QFN-44 package is small enough to embed inside the fixture housing.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4585T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF4585-I/ML | PIC18F4585T-I/ML | PIC18LF4585-I/PT | PIC18LF4553-I/ML | PIC18F4550-I/ML |
|---|---|---|---|---|---|---|
| Package | QFN-44 (8x8 mm) | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same | TQFP-44 - same pinout, different footprint | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 48 KB | 48 KB | 48 KB | 48 KB | 32 KB | 32 KB |
| RAM (SRAM) | 3328 B | 3328 B | 3328 B | 3328 B | 2048 B | 2048 B |
| Supply Voltage (VDD) | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V |
| Maximum Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| USB Peripheral | USB 2.0 Full-Speed (on-chip transceiver) | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| ECAN Controller | Yes (CAN 2.0B) | Yes | Yes | Yes | No | No |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 34 |
| ADC | 10-bit, 13 channels | 10-bit, 13 ch | 10-bit, 13 ch | 10-bit, 13 ch | 10-bit, 13 ch | 10-bit, 13 ch |
Key Differentiators
- Lowest VDDmin in the LF458x family (vs PIC18F4585T-I/ML)
- On-chip USB 2.0 FS transceiver (vs PIC18LF4480T-I/ML)
- Higher program memory density (vs PIC18LF4553-I/ML)
Design Notes
PIC18LF4585T-I/ML operates from 2.0V to 5.5V on VDD. Place a 0.1 uF ceramic bypass on each VDD pin (pins 8, 20, 42) within 5 mm of the pin and route a 4.7-10 uF bulk cap on the regulator output. The exposed pad (pin 45) must be soldered to a continuous PCB ground plane; do not leave it floating - this pad is the only thermal path for high-current USB enumeration.
Estimated: at 48 MHz CPU + USB Full-Speed active + ECAN transmitting simultaneously, the PIC18LF4585T-I/ML may draw ~70-90 mA peak from VDD. QFN-44 with copper poured under the EP gives theta_JA ~25-30 C/W, so junction-to-ambient rise at 90 mA x 5V is ~10-15 C - well within the 85 C industrial limit. Avoid placing the part near heat-dissipating components.
Route the USB D+/D- lines (RC4/RC5, pins 11-12) as a 90-ohm differential pair with length matching to within 150 mils, and keep total length under 50 mm. Place series ferrite beads or common-mode chokes near the USB connector for ESD immunity. The crystal traces (OSC1/OSC2, pins 17-18) should be short, guarded by a ground ring, and never run parallel to switching signals.
Do not power the PIC18LF4585T-I/ML from 5V while expecting 3.3V USB enumeration - configure the USB internal pull-up via firmware. Always ensure the exposed pad (EP) is soldered; uncoupled EP degrades thermal performance and can cause VDD core voltage instability during USB enumeration. Watch out for VDD voltage drop at full 48 MHz with USB active: drop-outs below 2.0V cause brown-out resets.
Compliance Information
Datasheet labels the package as LEAD FREE, PLASTIC. RoHS/REACH compliance per Microchip product page. AEC-Q100 not qualified - the part is rated -40C to +85C industrial, not automotive Grade 1/2. Halogen-free status not explicitly stated in the verified data; consult Microchip environmental compliance letter for definitive answer.
