PIC18LF4585-I/ML - 8-bit MCU 48KB Flash ECAN 44-QFN | Microchip
MPN: PIC18LF4585-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.34 | $8.34 |
| 10 | $7.51 | $75.10 |
| 100 | $6.72 | $672.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.42 | $5,420.00 |
PIC18LF4585-I/ML Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADC, communication buses, and I/O ports on one die. PIC microcontrollers from Microchip use a RISC architecture with a small, deterministic instruction set optimized for embedded control. Within the broader taxonomy, a PIC18LF4585 belongs to: microcontroller -> 8-bit MCU -> PIC18 family -> Flash MCU -> embedded controller -> semiconductor IC. The LF prefix denotes the low-voltage (2.0V-3.6V) variant of the PIC18F4585, trading absolute clock headroom for lower power consumption.
Key differentiating features include the integrated ECAN controller (CAN 2.0B active) for automotive and industrial bus networks, 48 KB self-programmable Flash with 1 KB EEPROM, hardware multipliers for 8x8 single-cycle math, nanoWatt power management with idle/doze/sleep modes, and in-circuit debug/programming via two ICD pins. The 44-QFN package offers a low 8x8 mm footprint suitable for space-constrained industrial modules.
Architecturally, the PIC18LF4585 uses a Harvard RISC core with a 16-bit instruction word and 8-bit data path, employing nanoWatt technology for low standby currents (under 100 nA typical in sleep). The ECAN module supports standard and extended identifiers, maskable filters, and bit timing configurable for 1 Mbps networks. The device retains legacy 18F compatibility while adding peripheral flexibility required for protocol bridging.
Typical applications include CAN bus node endpoints in automotive body and powertrain ECUs, industrial automation slaves communicating on DeviceNet or CANopen, embedded sensor hubs with UART/SPI bridges to CAN, low-power battery instrumentation, and HVAC building controllers. The wide peripheral set supports both motor control (via ECCP) and protocol routing without an external transceiver MCU.
Design considerations: ensure the 44-QFN exposed pad (pin 45) is soldered to a sufficiently large copper pour to meet thermal dissipation, and use 1% decoupling capacitors (100 nF plus 10 uF bulk) within 5 mm of VDD pins. Brown-out reset configuration in CONFIG2L must be enabled for automotive applications to guarantee defined startup behavior.
This page synthesizes distributor pricing, drop-in alternatives in the same 44-QFN footprint, and practical design notes that complement the manufacturer datasheet.
Drop-in alternatives for PIC18LF4585-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 PIC18LF4585-I/ML (same form factor and footprint) — differing in Package, Operating Temperature, ADC, Mounting Type, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4585-I/ML
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC18LF4580-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4680-I/ML
✅ Drop-In✓ In Stock
$4.05 / Unit
View Datasheet →PIC18LF4480-I/ML
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →PIC18F4580-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4480-I/ML
✅ Drop-In✓ In Stock
$4.89 / Unit
View Datasheet →PIC18LF4585-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18, 8-bit RISC Harvard |
| Instruction Set | 16-bit instruction word, 8-bit data path |
| Program Memory (Flash) | 48 KB (24K x 16) |
| Data RAM | 3,328 bytes |
| Data EEPROM | 1 KB |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 3.6 V (LF variant) |
| I/O Pins | 36 digital I/O |
| ADC | 10-bit, up to 11 channels |
| ECAN Module | CAN 2.0B Active, 1 Mbps capable |
| UART Modules | 2 (with LIN support) |
| SPI Modules | 1 |
| I2C Modules | 1 (MSSP) |
| CCP / ECCP Modules | 2 CCP, 1 ECCP |
| Timers | 4 (8-bit / 16-bit) |
| Package | 44-QFN (8x8 mm) - ML |
| Operating Temperature | -40 C to +85 C (Industrial -I) |
| Mounting Type | Surface Mount (QFN with exposed pad) |
| MSL Level | 3 |
| RoHS Status | Compliant |
PIC18LF4585-I/ML Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 3 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC negative reference |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC positive reference |
| Pin 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 6 | RA5/AN4 — Digital I/O / Analog input channel 4 |
| Pin 7 | RE0/RD — Digital I/O / Parallel port Read control |
| Pin 8 | RE1/WR — Digital I/O / Parallel port Write control |
| Pin 9 | RE2/CS — Digital I/O / Parallel port Chip Select |
| Pin 10 | VDD — Positive supply (2.0V to 3.6V for LF variant) |
| Pin 11 | VSS — Ground reference |
| Pin 12 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 13 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 14 | RC0/T1OSO — Digital I/O / Timer1 oscillator output |
| Pin 15 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Pin 16 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Pin 17 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 18 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 19 | RC5/SDO — Digital I/O / SPI data out |
| Pin 20 | RC6/TX1/CK1 — Digital I/O / UART1 TX / clock |
| Pin 21 | RC7/RX1/DT1 — Digital I/O / UART1 RX / data |
| Pin 22 | RD0/PSP0 — Digital I/O / Parallel slave port data 0 |
| Pin 23 | RD1/PSP1 — Digital I/O / Parallel slave port data 1 |
| Pin 24 | RD2/PSP2 — Digital I/O / Parallel slave port data 2 |
| Pin 25 | RD3/PSP3 — Digital I/O / Parallel slave port data 3 |
| Pin 26 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 27 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 28 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 29 | RB3/INT3 — Digital I/O / External interrupt 3 |
| Pin 30 | RB4 — Digital I/O / interrupt-on-change |
| Pin 31 | RB5 — Digital I/O / interrupt-on-change |
| Pin 32 | RB6/PGC — Digital I/O / In-circuit debug clock |
| Pin 33 | RB7/PGD — Digital I/O / In-circuit debug data |
| Pin 34 | RD4/PSP4 — Digital I/O / Parallel slave port data 4 |
| Pin 35 | RD5/PSP5 — Digital I/O / Parallel slave port data 5 |
| Pin 36 | RD6/PSP6 — Digital I/O / Parallel slave port data 6 |
| Pin 37 | RD7/PSP7 — Digital I/O / Parallel slave port data 7 |
| Pin 38 | C1RX — ECAN receive pin |
| Pin 39 | C1TX — ECAN transmit pin |
| Pin 40 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 41 | VSS — Ground reference |
| Pin 42 | RF0 — Digital I/O (port F) |
| Pin 43 | RF1 — Digital I/O (port F) |
| Pin 44 | RF2 — Digital I/O (port F) |
| Pin 45 | EP — Exposed pad - thermal/ground (must be soldered to ground pour) |
Typical Applications
PIC18LF4585-I/ML is suitable for 7 applications: Automotive CAN Bus Node, Industrial Automation Slave, Battery-Powered Sensor Hub, Building HVAC Controller, Industrial Motor Drive Stage, Medical Device Communication Bridge, Embedded IoT CAN Gateway.
Automotive CAN Bus Node
The PIC18LF4585-I/ML is well-suited to automotive CAN bus node endpoints where its integrated ECAN (CAN 2.0B Active) module supports both 11-bit and 29-bit identifiers at up to 1 Mbps, matching OBD-II and CANopen FD legacy bit rates used in body and powertrain ECUs. With 48 KB of Flash, the device can host a full CANopen or DeviceNet slave stack plus diagnostic handlers; 3,328 bytes of RAM is sufficient for CAN message buffers plus small RTOS or scheduling tables. The LF supply range of 2.0V-3.6V suits modern automotive 3.3V rails. Pair the MCU with an external high-speed CAN transceiver such as the MCP2551 or TJA1050, ensuring the TX/RX pins route directly to minimize stub lengths and meet CAN bus impedance requirements.
Recommended
Industrial Automation Slave
In industrial automation, the PIC18LF4585-I/ML acts as a CANopen or DeviceNet slave node, leveraging its ECAN controller, 36 digital I/O pins, and 10-bit ADC to interface with sensors, actuators, and HMI panels. The 48 KB Flash accommodates a CANopen CiA 401 profile plus application code, while the 3,328 B RAM handles PDO/TPDO buffers. Operating from 2.0V-3.6V and -40C to +85C, it tolerates harsh factory-floor temperatures and 24V industrial rails regulated down to 3.3V. The hardware ECCP module provides PWM outputs for motor control or proportional valve actuation, reducing the need for a separate gate-driver MCU.
Recommended
Battery-Powered Sensor Hub
The PIC18LF4585-I/ML fits battery-powered sensor hub designs that need occasional CAN wake-up events because its nanoWatt technology drops standby current below 100 nA in Sleep mode while preserving RAM and ECAN wake-up configuration. The LF variant's 2.0V-3.6V supply range allows direct Li-ion or Li-Po battery operation, eliminating boost converters. With 48 KB Flash, firmware can include CAN filtering, sensor calibration, and periodic logging; the 1 KB EEPROM stores non-volatile calibration constants across power cycles. The 10-bit ADC up to 11 channels supports multiple analog sensors such as thermistors, photocells, or pressure transducers.
Recommended
Building HVAC Controller
The PIC18LF4585-I/ML is ideal for building HVAC controllers that communicate over BACnet-MS/TP or proprietary CAN-based protocols, where its ECAN module, dual UARTs (one for MS/TP, one for debug), and 10-bit ADC interface directly with temperature, humidity, and airflow sensors. The 48 KB Flash is sufficient to host a BACnet object database plus scheduling logic, while 3,328 B RAM handles trend log buffers. Operating across -40C to +85C and 2.0V-3.6V, the part tolerates rooftop and plant-room environments. ECCP-based PWM outputs drive variable-speed fan control or proportional damper actuators without external motor controllers.
Recommended
Industrial Motor Drive Stage
The PIC18LF4585-I/ML serves as a low-cost digital control stage in small industrial motor drives, where its ECCP module generates center-aligned PWM for H-bridge or 3-phase inverter gate drivers, and its ECAN module exposes drive status to the plant-wide CANopen network. With 48 KB Flash, firmware can include field-oriented control (FOC) loops or trapezoidal commutation tables; the 10-bit ADC samples DC bus current and back-EMF inputs. The 2.0V-3.6V supply is best regulated from the 24V bus via a small buck converter. Industrial -40C to +85C operation supports cabinet-less mounting close to motor windings.
Recommended
Medical Device Communication Bridge
The PIC18LF4585-I/ML can act as a communication bridge in medical devices that need to translate between an internal SPI/I2C sensor bus and an external CAN-based patient monitoring network, leveraging its ECAN module for protocol bridging and dual UART/SPI/I2C for sensor side connectivity. With 48 KB Flash, it can host both a sensor driver stack and a CANopen or proprietary CAN stack; 3,328 B RAM buffers outgoing CAN frames during high-priority alarms. The LF supply range of 2.0V-3.6V simplifies battery-backed operation during mains loss. The industrial temperature grade and QFN package suit compact, sealed medical enclosures.
Recommended
Embedded IoT CAN Gateway
The PIC18LF4585-I/ML fits compact IoT gateways that aggregate sensor data from CAN-connected field devices and forward it over UART/SPI to an upstream radio module such as Wi-Fi, LoRa, or cellular. Its ECAN controller at 1 Mbps handles 50+ CAN nodes with proper filtering, while 48 KB Flash hosts a lightweight scheduler plus protocol translation. The 3,328 B RAM accommodates message queues, and the QFN-44 package suits small enclosures behind dashboards or inside machinery. The 2.0V-3.6V supply is ideal for solar or USB-bus-powered gateways.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4585-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4585-I/ML | PIC18LF4580-I/ML | PIC18LF4680-I/ML | PIC18LF4480-I/ML |
|---|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) /ML | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 48 KB | 48 KB - same | 32 KB (-33%) | 64 KB (+33%) | 16 KB (-67%) |
| Operating Voltage | 2.0V to 3.6V | 4.2V to 5.5V | 2.0V to 3.6V - same | 2.0V to 3.6V - same | 2.0V to 3.6V - same |
| ECAN Module | Yes (CAN 2.0B Active) | Yes - same | Yes - same | Yes - upgraded ECAN | CAN (no ECAN) |
| Data RAM | 3,328 B | 3,328 B - same | 3,328 B - same | 3,328 B | 3,328 B - same |
| Data EEPROM | 1 KB | 1 KB - same | 1 KB - same | 1 KB - same | 1 KB - same |
| CPU Frequency | 40 MHz (10 MIPS) | 40 MHz - same | 40 MHz - same | 40 MHz - same | 40 MHz - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C - same | -40C to +85C - same | -40C to +85C - same |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Higher Flash density than PIC18LF4580-I/ML in same footprint (vs PIC18LF4580-I/ML)
- Low-voltage operation suitable for 3.3V systems (vs PIC18F4585-I/ML)
- Integrated ECAN module without external controller (vs PIC18LF4480-I/ML)
Design Notes
Estimated: at full 40 MHz CPU activity and 3.6V supply, the PIC18LF4585-I/ML core current is approximately 16 mA, dissipating about 58 mW. The 44-QFN package exposes a thermal pad (pin 45) on the bottom that must be soldered to a copper pour of at least 1 square inch to keep the junction temperature within industrial -40C to +85C limits. Without the exposed pad soldered, theta_JA rises above 50 C/W and reliability is at risk.
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 10 and 40), plus a single 10 uF bulk tantalum or ceramic capacitor near the IC. Route the high-speed CAN TX/RX pair (C1TX, C1RX, pins 39/38) as a matched 50-ohm differential pair, terminated with 120-ohm resistors at both ends of the bus. Avoid routing CAN signals near switching regulator inductors or oscillator traces to minimize EMI coupling into the ECAN receiver.
Brown-out reset (BOR) must be enabled in CONFIG2L for any automotive or industrial deployment; otherwise the MCU may execute code at indeterminate VDD levels below 2.0V and corrupt Flash/EEPROM. When migrating between LF (2.0V-3.6V) and F (4.2V-5.5V) variants of the PIC18F4585 family, confirm that all analog references and pull-ups match the new supply range. The ECAN oscillator (CANTX pin 39, CANRX pin 38) requires configuration of the CIOCON register for proper I/O mapping; leaving CIOCON in default state disables the CAN peripheral.
For the 44-QFN footprint, the central exposed pad (pin 45) must include at least eight thermal vias (0.3 mm drill, 0.5 mm pitch) connecting to an internal ground plane to spread heat and provide low-inductance ground return. Place the external crystal or resonator within 5 mm of OSC1/OSC2 (pins 12/13) with grounded guard traces around the oscillator traces to suppress radiated emissions. The ICSP programming pins (PGC = RB6 pin 32, PGD = RB7 pin 33) must be accessible on the PCB via a 2x3 or 1x6 header for in-circuit programming and debugging with MPLAB ICD 5.
Use nanoWatt Sleep mode (RCONbits.IDLEN = 0 and OSCCONbits.SLPEN = 1) for battery-backed applications where the ECAN module wakes the MCU on a valid CAN frame. With ECAN disabled and peripherals off, sleep current drops below 100 nA at 3.0V, preserving Li-ion battery capacity over months of standby. The on-board low-power Timer1 oscillator can keep an RTC ticking while the core is asleep, allowing scheduled wake-up without external RTC chips.
Compliance Information
Industrial -40C to +85C grade. RoHS and lead-free per Microchip product page. AEC-Q100 qualified automotive variants are available separately as PIC18F4585 family E-block parts; consult Microchip automotive portfolio for AEC-Q100 PIC18LF4585 equivalents.
