PIC18LF6585-I/L - 8-bit MCU, 48KB Flash, 40MHz, 52 I/O | Microchip
MPN: PIC18LF6585-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.62 | $76.20 |
| 100 | $6.55 | $655.00 |
| 500 | $5.84 | $2,920.00 |
| 1,000 | $5.1 | $5,100.00 |
PIC18LF6585-I/L Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and a rich set of on-chip peripherals into a single IC. Within the broader semiconductor taxonomy, an MCU belongs to the category of embedded processors (alongside DSPs, FPGAs, and microprocessors) and is the workhorse of real-time control applications. The PIC18F series uses an enhanced Harvard architecture with separate code and data buses, giving it deterministic instruction execution ideal for interrupt-driven control loops. The 'LF' prefix designates the low-voltage variant supporting operation down to 2.0V, while the 'F' versions require 4.2V minimum.
Key features of the PIC18LF6585-I/L include 1024 bytes of EEPROM data memory, an ECAN controller that supports CAN 2.0B active with prioritized message handling, a USART with LIN master/slave support, an MSSP for SPI and I2C, four timer modules (Timer0/1/2/3), a 10-bit PWM module, and nanoWatt power management for sleep-mode operation. The 'I' suffix indicates the industrial operating temperature range of -40C to +85C, making it suitable for non-automotive harsh environments.
Architecturally, the PIC18LF6585 employs Microchip's enhanced 8-bit core with a 16-bit instruction word, an 8-level hardware stack, and a peripheral oscillator that allows independent timer operation from the main system clock. Its wide operating voltage range (2.0V to 5.5V) and low-power modes support battery-backed applications, while the ECAN module hardware-filters incoming frames to reduce CPU load in networked designs.
Typical applications include industrial CAN-bus node controllers, HVAC control boards, building automation gateways, motor control front-ends, point-of-sale terminals, and embedded sensor hubs. Its 52 I/O pins provide ample headroom for keypad scanning, LCD driving, and parallel sensor aggregation.
When designing with this device, ensure your MPLAB X IDE project selects the PIC18LF6585 device ID and confirm the 68-pin PLCC footprint matches your PCB land pattern. ECAN bus termination, oscillator stability, and Brown-Out Reset (BOR) configuration must be reviewed before firmware bring-up.
This page synthesizes distributor pricing, same-brand drop-in alternatives from the PIC18 family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC18LF6585-I/L — 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 PIC18LF6585-I/L (same form factor and footprint) — differing in Core Architecture, Mounting Type, Operating Temperature, Package, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF6680-I/L
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →PIC18F6585-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6682-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF8585-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6585-I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (Enhanced Harvard) |
| Series | PIC18F |
| Program Memory | 48 KB (24K x 16) Flash |
| Data RAM | 3328 bytes |
| EEPROM | 1024 bytes |
| Maximum Clock Frequency | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 52 |
| ADC | 10-bit, up to 12 channels |
| CAN Module | ECAN (CAN 2.0B Active) |
| UART/USART | 1x USART with LIN support |
| SPI | 1x MSSP (SPI/I2C) |
| Timers | 4 (Timer0, Timer1, Timer2, Timer3) |
| PWM | 10-bit, multiple channels |
| Package | 68-PLCC (J-Lead) |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18LF6585-I/L Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, internal pull-up |
| Pin 2 | RA0 — PORTA bit 0 / AN0 analog input |
| Pin 3 | RA1 — PORTA bit 1 / AN1 analog input |
| Pin 4 | RA2 — PORTA bit 2 / AN2 / VREF- |
| Pin 5 | RA3 — PORTA bit 3 / AN3 / VREF+ |
| Pin 6 | RA4 — PORTA bit 4 / T0CKI |
| Pin 7 | RA5 — PORTA bit 5 / AN4 / SS |
| Pin 8 | RA6 — PORTA bit 6 / OSC2 |
| Pin 9 | OSC1 — Oscillator crystal input |
| Pin 10 | OSC2 — Oscillator crystal output |
| Pin 11 | RC0 — PORTC bit 0 |
| Pin 12 | RC1 — PORTC bit 1 |
| Pin 13 | RC2 — PORTC bit 2 / CCP1 |
| Pin 14 | RC3 — PORTC bit 3 / SCL |
| Pin 15 | RC4 — PORTC bit 4 / SDA |
| Pin 16 | RC5 — PORTC bit 5 / SDO |
| Pin 17 | RC6 — PORTC bit 6 / TX |
| Pin 18 | RC7 — PORTC bit 7 / RX |
| Pin 19 | GND — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0 — PORTB bit 0 / INT0 |
| Pin 22 | RB1 — PORTB bit 1 / INT1 |
| Pin 23 | RB2 — PORTB bit 2 / INT2 |
| Pin 24 | RB3 — PORTB bit 3 / CCP2 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 / PGM |
| Pin 27 | RB6 — PORTB bit 6 / PGC |
| Pin 28 | RB7 — PORTB bit 7 / PGD |
| Pin 29 | GND — Ground reference |
| Pin 30 | VDD — Positive supply voltage |
| Pin 31 | RD0 — PORTD bit 0 / PSP0 |
| Pin 32 | RD1 — PORTD bit 1 / PSP1 |
| Pin 33 | RD2 — PORTD bit 2 / PSP2 |
| Pin 34 | RD3 — PORTD bit 3 / PSP3 |
| Pin 35 | RD4 — PORTD bit 4 / PSP4 |
| Pin 36 | RD5 — PORTD bit 5 / PSP5 / P1A |
| Pin 37 | RD6 — PORTD bit 6 / PSP6 / P1B |
| Pin 38 | RD7 — PORTD bit 7 / PSP7 / P1C |
| Pin 39 | GND — Ground reference |
| Pin 40 | VDD — Positive supply voltage |
| Pin 41 | RE0 — PORTE bit 0 / AN5 / RD |
| Pin 42 | RE1 — PORTE bit 1 / AN6 / WR |
| Pin 43 | RE2 — PORTE bit 2 / AN7 / CS |
| Pin 44 | RE3 — PORTE bit 3 |
| Pin 45 | RE4 — PORTE bit 4 |
| Pin 46 | RE5 — PORTE bit 5 |
| Pin 47 | RE6 — PORTE bit 6 |
| Pin 48 | RE7 — PORTE bit 7 |
| Pin 49 | GND — Ground reference |
| Pin 50 | VDD — Positive supply voltage |
| Pin 51 | RF0 — PORTF bit 0 / AN8 |
| Pin 52 | RF1 — PORTF bit 1 / AN9 / C2OUT |
| Pin 53 | RF2 — PORTF bit 2 / AN10 / C1OUT |
| Pin 54 | RF3 — PORTF bit 3 / AN11 |
| Pin 55 | RF4 — PORTF bit 4 / AN12 |
| Pin 56 | RF5 — PORTF bit 5 / AN13 |
| Pin 57 | RF6 — PORTF bit 6 / AN14 |
| Pin 58 | RF7 — PORTF bit 7 / AN15 |
| Pin 59 | GND — Ground reference |
| Pin 60 | VDD — Positive supply voltage |
| Pin 61 | RG0 — PORTG bit 0 / ECCP1 |
| Pin 62 | RG1 — PORTG bit 1 / TX2 |
| Pin 63 | RG2 — PORTG bit 2 / RX2 |
| Pin 64 | RG3 — PORTG bit 3 / CCP3 |
| Pin 65 | RG4 — PORTG bit 4 / CCP4 |
| Pin 66 | RG5 — PORTG bit 5 |
| Pin 67 | RG6 — PORTG bit 6 |
| Pin 68 | RG7 — PORTG bit 7 |
Typical Applications
PIC18LF6585-I/L is suitable for 6 applications: Industrial CAN-Bus Node Controller, HVAC Control Board, Building Automation Gateway, Motor Control Front-End, Point-of-Sale Terminal, Embedded Sensor Hub.
Industrial CAN-Bus Node Controller
The PIC18LF6585-I/L is purpose-built for industrial CAN-bus node controllers where 48KB of Flash comfortably hosts CANopen or DeviceNet protocol stacks, and the 52 I/O pins aggregate sensor inputs and actuator outputs from a single die. Its hardware ECAN module implements CAN 2.0B Active with hardware acceptance filtering, offloading bus arbitration from the CPU and freeing 10 MIPS of throughput for application logic. The 2.0V minimum supply allows battery-backed nodes that continue logging CAN traffic during line-power outages. Place the MCU between the bus transceiver (such as MCP2551) and the I/O connectors, with a 120-ohm termination at the bus endpoints per CAN specifications.
Recommended
HVAC Control Board
HVAC control boards benefit from the PIC18LF6585-I/L's combination of 52 I/O for reading multiple temperature sensors, damper feedback, and relay outputs, plus the ECAN module for inter-board communication across multiple zones. The 10-bit ADC with up to 12 channels digitizes thermistor bridges and pressure transducers without an external ADC, while the 4 timers drive triac phase-control for AC line modulation. Operating from 2.0V to 5.5V supports direct 3.3V power designs, reducing heat dissipation in wall-mounted thermostats. The -40C to +85C industrial temperature range ensures reliable operation in mechanical rooms and unconditioned spaces.
Recommended
Building Automation Gateway
The PIC18LF6585-I/L is well matched to building automation gateways that bridge BACnet MS/TP, Modbus, or proprietary CAN-bus field networks to Ethernet or Wi-Fi backhaul routers. The 48KB Flash accommodates Modbus RTU/TCP libraries alongside application logic, and 3328 bytes of RAM holds message buffers for routing telemetry packets. The MSSP (SPI/I2C) interface connects to FRAM or EEPROM for storing building schedules and configuration parameters. Operating down to 2.0V supports battery-backed RTC retention, and the ECAN module handles the multi-node CAN bus typical of HVAC and lighting control panels.
Recommended
Motor Control Front-End
Motor control front-ends use the PIC18LF6585-I/L to read encoder quadrature signals, Hall-effect sensors, and shunt current measurements, then generate PWM command signals for downstream three-phase inverter drivers. The 4 hardware timers enable precise PWM edge alignment, and the 10-bit ADC samples current feedback with deterministic latency. The ECAN module delivers closed-loop setpoint updates from a centralized motion controller at bus speeds up to 1 Mbps. The 52 I/O pins allocate dedicated channels for fault inputs, brake control, and enable lines without external I/O expanders. Industrial temperature rating supports factory-floor mounting.
Recommended
Point-of-Sale Terminal
Point-of-sale (POS) terminals benefit from the PIC18LF6585-I/L's wide I/O count for driving a character LCD, scanning a keypad matrix, and interfacing to card readers over SPI or UART. The 48KB Flash stores payment application logic, transaction journaling, and security primitives, while 1024 bytes of EEPROM retains terminal configuration across power cycles. The ECAN interface coordinates multi-counter layouts (such as restaurant line displays), and the 2.0V-5.5V supply range simplifies power management across battery-backed and mains-powered configurations. Industrial temperature grade ensures reliability in retail back-of-house environments.
Recommended
Embedded Sensor Hub
The PIC18LF6585-I/L functions as an embedded sensor hub aggregating inputs from temperature, humidity, flow, and gas sensors via I2C and SPI, with the 52 I/O pins providing ample expansion headroom. Its 10 MIPS throughput handles local filtering and threshold detection before transmitting aggregated data over CAN-bus or USART to a host PLC. The nanoWatt power-down modes extend battery life in remote installations, and the 3328-byte RAM buffers sensor history between transmissions. The 68-pin PLCC package is preferred for industrial sensor enclosures that require through-hole mechanical strength over surface-mount TQFP.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF6585-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF6680-I/L | PIC18F6585-I/L | PIC18LF6682-I/L | PIC18LF8585-I/L |
|---|---|---|---|---|---|
| Package | 68-PLCC (J-Lead) | 68-PLCC (J-Lead) - same | 68-PLCC (J-Lead) - same | 68-PLCC (J-Lead) - same | 68-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 48 KB Flash | 80 KB Flash | 48 KB Flash | 80 KB Flash | 48 KB Flash |
| Data RAM | 3328 bytes | 4096 bytes | 3328 bytes | 3328 bytes | 3328 bytes |
| Operating Voltage Range | 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 |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 52 | 52 | 52 | 52 | 52 |
| ECAN Module | Yes (CAN 2.0B Active) | Yes (CAN 2.0B Active) | Yes (CAN 2.0B Active) | Yes (CAN 2.0B Active + LIN) | Yes (CAN 2.0B Active) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- Wide 2.0V-5.5V operating voltage range enables direct battery connection (vs PIC18F6585-I/L)
- Higher Flash memory headroom for complex CAN protocol stacks (vs PIC18LF4580-I/PT)
- Drop-in compatibility with higher-memory PIC18LF6680 sibling (vs PIC18LF6680-I/L)
Design Notes
The PIC18LF6585-I/L requires decoupling capacitors of 100 nF ceramic placed within 5 mm of each VDD pin and a single 10 uF tantalum or low-ESR electrolytic bulk capacitor on the main supply rail. There are six VDD and six GND pins distributed around the 68-PLCC package; bypassing each VDD/GND pair independently minimizes ground bounce and VDD droop during high-current port transitions. Brown-out reset (BOR) must be enabled in configuration bits for industrial deployments to prevent code execution at low supply voltages.
The 68-pin PLCC (J-Lead) footprint requires through-hole pads with J-lead compatible land patterns. Thermal relief spokes on the PLCC pads improve hand-soldering but are optional for wave-solder production. A ground plane should be placed on the bottom layer directly under the MCU, with the ECAN bus traces routed as a differential pair (CANH and CANL) of characteristic impedance near 120 ohms. Keep the ECAN bus traces away from switching power or PWM signals to minimize radiated EMI coupling.
Do not confuse the LF (low-voltage 2.0V-5.5V) variant with the standard F (4.2V-5.5V) variant when designing battery-backed systems - the LF version is mandatory for 3.3V-only operation. Always set the configuration bits for the correct oscillator mode (HS, XT, or EC) and disable the watchdog timer (WDT) if not used, or configure it with a generous postscaler to avoid unintended resets during long ECAN ISR execution. When migrating between PIC18LF6585 and PIC18LF6680, recompile the firmware against the new device ID even though the pinout is identical.
Compliance Information
Industrial-grade MCU not AEC-Q100 qualified for automotive. RoHS and lead-free compliant per Microchip product declarations. REACH compliance confirmed via manufacturer datasheet.
