PIC18LF2685-I/SP - 8-bit 40MHz 96KB Flash MCU w/ ECAN | Microchip
MPN: PIC18LF2685-I/SP ✓ فعالPIC18LF2685-I/SP نمای کلی
An 8-bit microcontroller (MCU) such as the PIC18LF2685 is a single-chip computer based on an 8-bit data path, optimized for deterministic real-time control rather than raw throughput. Within the system hierarchy, PIC18F devices sit between PIC16F baseline controllers and dsPIC33 Enhanced Digital Signal Controllers, occupying the high-performance 8-bit tier. They are widely deployed in industrial automation, automotive body and sensor networks, and embedded control applications where ECAN, capacitive touch (mTouch via CTMU), and PWM peripherals are required.
Key features include the integrated ECAN 2.0B module (compliant with CAN 2.0A/B active and passive), a 10-bit A/D converter with up to 11 input channels, two Enhanced USART modules that support LIN/IrDA, two MSSP ports configurable as SPI or I2C (Master/Slave), and nanoWatt Technology with multiple idle and sleep modes for reduced quiescent current. The instruction set is a 16-bit enhanced Harvard architecture with 75 instructions and 83 with the extended instruction set enabled.
Architecturally the part uses a 16-bit program-memory bus with an 8-bit data bus, a hardware multiplier for 8x8 single-cycle operations, and a priority-level interrupt controller with both edge- and level-sensitive external sources. The wide operating voltage window of 2.0 V to 5.5 V allows direct battery connection (e.g., two or three alkaline cells) and simplifies designs that must survive load-dump transients when paired with an external regulator.
Typical applications include CAN node endpoints in industrial and automotive networks, sensor-interface front ends, motor-control signal conditioning (pre-driver), HVAC controllers, and low-power battery-backed instrumentation. The combination of ECAN, nanoWatt sleep modes, and through-hole SPDIP packaging makes it a strong fit for legacy and field-serviceable embedded designs.
When designing with this part, ensure the MCLR reset network (typical 10 kohm pull-up and a decoupling cap) is sized per AC/DC characteristics table. Configure the CONFIG words using MPLAB X IDE or a compatible programmer; the LF (low-voltage F) variant requires VDD above 2.0 V for Flash programming.
This page synthesizes verified distributor pricing, same-package drop-in alternatives, and design notes beyond what is published in the standalone Microchip datasheet.
جایگزین‌های drop-in برای PIC18LF2685-I/SP — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC18LF2685-I/SP (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, ADC, Program Memory (Flash), Timers, I/O Pins.
PIC18F2685-I/SP
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18LF2682-I/SP
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2680-I/SP
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2553-I/SP
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2550-I/SP
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2610-I/SP
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2685-I/SP حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core | PIC18F 8-bit RISC, enhanced Harvard architecture |
| Instruction Set | 75 base instructions (83 with extended instruction set enabled) |
| Program Memory (Flash) | 96 KB |
| RAM | 3.25 KB (3328 bytes) |
| EEPROM | 1 KB (1024 bytes) |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 25 (shared with analog/peripheral functions) |
| ADC | 10-bit, up to 11 channels |
| CAN | ECAN 2.0B active/passive |
| Communication Interfaces | 2x EUSART (LIN/IrDA), 2x MSSP (SPI/I2C) |
| دمای کاری | -40 C to +85 C (industrial, -I) |
| بسته‌بندی | 28-pin SPDIP (SP) |
| نوع نصب | Through-hole (DIP) |
| Lead-Free / RoHS | Lead-free finish, RoHS-compliant |
| Program Memory Type | Flash (self-programmable under software control) |
| nanoWatt Technology | Yes (multiple idle/sleep modes) |
| ICSP / ICD Support | In-Circuit Serial Programming and In-Circuit Debug |
پیکربندی پین PIC18LF2685-I/SP
| پین 1 | MCLR — Master Clear (Reset) input, internal pull-up enabled via configuration |
| پین 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| پین 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| پین 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| پین 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پین 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| پین 8 | VSS — Ground reference |
| پین 9 | OSC1/CLKI/RA7 — Oscillator input / external clock input / PORTA bit 7 |
| پین 10 | OSC2/CLKO/RA6 — Oscillator output / clock output / PORTA bit 6 |
| پین 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| پین 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| پین 13 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 output |
| پین 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 17 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| پین 18 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| پین 19 | VSS — Ground reference |
| پین 20 | VDD — Positive supply (2.0 V to 5.5 V) |
| پین 21 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| پین 22 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| پین 23 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| پین 24 | RB3/INT3 — PORTB bit 3 / External interrupt 3 |
| پین 25 | RB4 — PORTB bit 4 (interrupt-on-change) |
| پین 26 | RB5 — PORTB bit 5 (interrupt-on-change) |
| پین 27 | RB6/PGC — PORTB bit 6 / ICSP clock / ICD clock |
| پین 28 | RB7/PGD — PORTB bit 7 / ICSP data / ICD data |
کاربردهای معمول
PIC18LF2685-I/SP مناسب است برای 6 کاربردs: Industrial CAN Node, Automotive Sensor Interface, Battery-Powered Sensor Logger, HVAC / Building Automation, Industrial Motor Signal Conditioning, Sensor Hub with LIN / CAN Bridge.
Industrial CAN Node
The PIC18LF2685-I/SP is purpose-built for industrial CAN node endpoints in CANopen, DeviceNet, and proprietary CAN 2.0B networks. Its integrated ECAN module provides 8 acceptance filters and 8 acceptance masks with active and passive protocol support, eliminating the need for an external CAN controller. Combined with the 96 KB Flash (48K x 16) and 3.25 KB RAM, the MCU can run a CANopen stack plus substantial application logic on a single chip. Pair it with an external transceiver such as the MCP2551 or MCP2562 for ISO 11898-2/-5 compliant bus isolation. The 2.0 V to 5.5 V supply range lets the same firmware operate on 24 V industrial buses (via a small switching regulator) or 3.3 V backplanes without re-qualification. nanoWatt sleep modes drop quiescent current into the microamp range for sensor-actuator nodes that must wake only on CAN traffic or timer events.
پیشنهادی
Automotive Sensor Interface
In automotive body and sensor modules, the PIC18LF2685-I/SP serves as a front-end MCU for temperature, pressure, position, and battery-current sensors feeding a CAN bus. The 10-bit ADC and 11 analog input channels directly digitize ratiometric sensor outputs without an external ADC, while the nanoWatt power management lets the module survive crank and load-dump transients. The -40 C to +85 C industrial operating range covers most cabin and under-hood sensor locations; designers needing -40 C to +125 C should select an AEC-Q100 qualified variant instead. The extended PIC18F instruction set accelerates signal conditioning and PID loops for chassis and HVAC actuators.
پیشنهادی
Battery-Powered Sensor Logger
For remote, battery-powered sensor loggers, the PIC18LF2685-I/SP combines a 2.0 V minimum VDD (two alkaline cells), 10 MIPS throughput, and nanoWatt sleep current below 1 microamp. The on-board 1 KB EEPROM handles thousands of calibration samples without taxing the Flash endurance budget, and the 96 KB Flash stores months of compressed sensor logs. The 28-pin SPDIP package is ideal for hand-soldered field units and prototypes. Designers can wake the part periodically via the Watchdog Timer or external interrupt, capture an ADC reading, write to EEPROM, and return to sleep to achieve multi-year battery life on a single 3 V lithium cell.
پیشنهادی
HVAC / Building Automation
The PIC18LF2685-I/SP fits HVAC and building automation controllers where ECAN or simple RS-485 backbones interconnect distributed damper, valve, and sensor modules. The two EUSART modules support RS-232 and RS-485 with LIN/IrDA extensions, while the MSSP ports drive SPI sensors or I2C peripherals such as temperature/humidity ICs and EEPROMs. The 10-bit ADC reads potentiometers and 4-20 mA transducers through external current-sense resistors. With 96 KB Flash, a single part hosts a BACnet or Modbus slave firmware plus on-board scheduling logic, eliminating a second co-processor.
پیشنهادی
Industrial Motor Signal Conditioning
Use the PIC18LF2685-I/SP as a pre-driver signal-conditioning MCU between low-voltage sensors and a power-stage controller in industrial drives. The 40 MHz core and 10-bit ADC sample phase currents at the rates needed for field-oriented control pre-processing, and the PWM/ECCP modules generate timing pulses for the upstream gate driver. nanoWatt Technology keeps idle-mode consumption negligible when the drive is in standby. ECAN reports torque, speed, and fault conditions to the central controller, reducing analog wiring harness cost in cabinet-based systems.
پیشنهادی
Sensor Hub with LIN / CAN Bridge
The PIC18LF2685-I/SP is well-suited as a sensor hub bridging LIN (Local Interconnect Network) sub-networks to a CAN backbone. Both EUSARTs support LIN master/slave with automatic baud-rate sync, and the integrated ECAN handles the high-speed backbone. The MCU can poll a string of LIN slaves, aggregate data, normalize readings, and forward events on CAN, all within a single 8-bit part. The 96 KB Flash hosts the full LIN + CAN protocol stack plus application logic, allowing cost-sensitive body-electronics modules that previously required two microcontrollers to consolidate into one. The 28-pin SPDIP package simplifies laboratory bring-up.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18LF2685-I/SP — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18F2685-I/SP | PIC18LF2682-I/SP | PIC18LF2680-I/SP | PIC18LF2553-I/SP | PIC18LF2610-I/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SPDIP-28 | SPDIP-28 (same) | SPDIP-28 (same) | SPDIP-28 (same) | SPDIP-28 (same) | SPDIP-28 (same) |
| Flash | 96 KB | 96 KB | 80 KB | 64 KB | 32 KB | 96 KB |
| RAM | 3.25 KB | 3.25 KB | 2.3 KB | 2.3 KB | 2 KB | 3.25 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 256 B | 1 KB |
| VDD Range | 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 | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Max CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 48 MHz / 12 MIPS | 40 MHz / 10 MIPS |
| ECAN | Yes (2.0B active/passive) | Yes | Yes | Yes | No (USB instead) | No |
| USB | No | No | No | No | USB 2.0 FS OTG | No |
تفاوت‌های کلیدی
- On-chip ECAN 2.0B active/passive eliminates external CAN controller (در مقابلPIC18LF2610-I/SP)
- Larger Flash and RAM than CAN-enabled sibling (در مقابلPIC18LF2682-I/SP)
- Wide voltage operation down to 2.0 V for battery and 3.3 V systems (در مقابلPIC18F2685-I/SP)
یادداشت‌های طراحی
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 20) and another at the AVdd/Vdd pair if the device is in a larger package variant. For battery applications where VDD can drop below 4.5 V, ensure the BOR (Brown-Out Reset) configuration bit is enabled and the BOR voltage threshold matches the minimum system supply to avoid code execution during brown-out. nanoWatt sleep current is in the microamp range only when peripherals (ADC, ECAN, EUSART) are disabled and unused I/O are configured as outputs driving low.
Do not confuse the LF (low-voltage F) variant with the standard F variant: PIC18LF2685 operates from 2.0 V to 5.5 V, while PIC18F2685 requires 4.2 V to 5.5 V. Substituting the F variant into an LF design will brick the part on a 3.3 V rail. Also ensure the MCLR pull-up resistor is 10 kohm and that the PGC/PGD lines have 4.7 kohm pull-downs only if external in-circuit debugging requires them; floating PGD/PGC can prevent ISP programming. Configuration bits must be programmed before any code reads protected regions.
For ECAN applications, route the CAN TX/RX pins to the external transceiver with short, impedance-controlled traces and a 120 ohm termination resistor at each bus end. Place the MCP2551 or MCP2562 transceiver close to the bus connector and keep the CAN bus traces away from switching regulator inductors. The analog AVdd pin should be filtered with an LC or ferrite bead from VDD to AVdd when the ADC is used to read low-level sensors; tie unused analog pins to Vdd or Vss to minimize leakage current.
اطلاعات انطباق
RoHS compliance and lead-free finish per Microchip product page; the standard PIC18LF2685-I/SP is not AEC-Q100 qualified; AEC-Q100 automotive variants carry a -Q1 or -E (extended) suffix.
