PIC18F2685-I/SO - 8-bit 40MHz 96KB Flash MCU w/ ECAN | Microchip
MPN: PIC18F2685-I/SO ✓ פעילPIC18F2685-I/SO סקירה
What is an 8-bit flash microcontroller? It is a single-chip computer built around an 8-bit data path, integrating CPU core, non-volatile Flash program memory, SRAM data memory, and a rich peripheral set (ADC, timers, communication controllers). In the product taxonomy this places the PIC18F2685-I/SO within microcontrollers -> microcontrollers (MCU) -> integrated circuits -> semiconductors. ECAN-equipped MCUs target real-time deterministic networking in industrial and automotive systems.
Key features include 96 KB (48K x 16) Flash, 3.25 KB (1.3K x 16) RAM, 1 KB EEPROM, a 10-bit / 8-channel ADC, two 8-bit and three 16-bit timers, two comparators, an 8-bit parallel slave port, and a USART with LIN support plus an MSSP (SPI/I2C). Enhanced features cover self-programmability, internal oscillator, ICD (in-circuit debug), and nanoWatt sleep modes drawing microamp-level currents for battery-aware applications.
Architecturally, the part uses a RISC Harvard core with a 16-bit instruction word, an 8-level hardware stack, 31 interrupt sources and a hardware multiplier that accelerates 8x8 bit operations. The integrated ECAN module supports CAN 2.0B active (with acceptance filters and buffers), simplifying node design in industrial sensor networks and automotive body/CAN networks.
Typical applications include CAN node endpoints (sensor clusters, industrial automation), automotive body and powertrain controllers (where ECAN is required), LIN/J2602 slave nodes, USB-to-CAN bridge companions, and low-power remote sensor nodes using nanoWatt sleep. For designers comparing pin-compatible parts, the PIC18F2680 (no ECAN), PIC18F2682 (smaller Flash) and PIC18F4685 (40/44-pin) share the ECAN feature with the PIC18F2685.
When designing with this device, allocate 4.2V to 5.5V on VDD, place decoupling close to the supply pins, route the ECAN RX/TX traces as a differential pair with 120-ohm termination, and reserve RC0/RC3 or the dedicated CCP/ICSP pins for in-circuit serial programming.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a faster engineering selection path.
חלופות תחליף ישיר עבור PIC18F2685-I/SO — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC18F2685-I/SO (אותו גורם צורה וטביעת רגל) — שונים ב Package, ADC, Operating Temperature, Timers, RoHS Status.
PIC18F2680-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F2682-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F2685-E/SO
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F2680-E/SP
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4585-I/SP
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18F4685-I/PT
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F2685-I/SO דירוגים מרביים ומאפיינים חשמליים
| Family | PIC18F2xxx |
| Core | PIC 8-bit RISC Harvard |
| Max CPU Speed | 40 MHz |
| Program Memory | 96 KB Flash (48K x 16) |
| Data RAM | 3.25 KB (1.3K x 16) |
| EEPROM | 1 KB |
| I/O Pins | 25 |
| ADC | 10-bit, 8 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Comparators | 2 |
| Communication | ECAN, USART (LIN), MSSP (SPI/I2C) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| טמפרטורת פעולה | -40 C to +85 C (Industrial) |
| מארז | 28-pin SOIC (SO) |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
| Programming | ICSP (In-Circuit Serial Programming), Self-programming |
תצורת פינים של PIC18F2685-I/SO
| פין 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / digital input only |
| פין 2 | RA0/AN0 — Digital I/O / analog input channel 0 |
| פין 3 | RA1/AN1 — Digital I/O / analog input channel 1 |
| פין 4 | RA2/AN2/VREF- — Digital I/O / analog input channel 2 / ADC VREF- |
| פין 5 | RA3/AN3/VREF+ — Digital I/O / analog input channel 3 / ADC VREF+ |
| פין 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| פין 7 | RA5/AN4/SS — Digital I/O / analog input channel 4 / SPI slave select |
| פין 8 | OSC1/CLKI/RA7 — Oscillator input / external clock in / digital I/O |
| פין 9 | OSC2/CLKO/RA6 — Oscillator output / clock out / digital I/O |
| פין 10 | RC0/T1OSO/T13CKI — Digital I/O / Timer1 oscillator output / Timer1/3 clock input |
| פין 11 | RC1/SOSI/ECCP2 — Digital I/O / SPI data / Enhanced CCP2 output |
| פין 12 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| פין 13 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| פין 14 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| פין 15 | RC5/SDO — Digital I/O / SPI data out |
| פין 16 | RC6/TX/CK — Digital I/O / USART async transmit / USART sync clock |
| פין 17 | RC7/RX/DT — Digital I/O / USART async receive / USART sync data |
| פין 18 | VSS — Ground reference |
| פין 19 | VDD — Positive supply (5V) |
| פין 20 | RB0/AN10/INT0 — Digital I/O / analog input / external interrupt 0 |
| פין 21 | RB1/AN8/INT1 — Digital I/O / analog input / external interrupt 1 |
| פין 22 | RB2/AN8/INT2 — Digital I/O / analog input / external interrupt 2 |
| פין 23 | RB3/AN9/CCP2 — Digital I/O / analog input / CCP2 output |
| פין 24 | RB4/AN11 — Digital I/O / analog input |
| פין 25 | RB5/AN12 — Digital I/O / analog input |
| פין 26 | RB6/PGC — Digital I/O / ICSP clock |
| פין 27 | RB7/PGD — Digital I/O / ICSP data |
| פין 28 | VSS — Ground reference (return) |
יישומים טיפוסיים
PIC18F2685-I/SO מתאים עבור 6 יישוםs: Industrial CAN Node / Sensor Hub, Automotive Body Electronics / CAN Node, USB-to-CAN Bridge Companion, Battery-Powered Remote Sensor Node, Motor Control and BLDC / Stepper Driver Board, HVAC / Building Automation Controller.
Industrial CAN Node / Sensor Hub
The PIC18F2685-I/SO is purpose-built for industrial CAN networks thanks to its integrated ECAN 2.0B active controller. It connects to a 5V CAN transceiver such as the MCP2551 or TJA1050, providing hardware acceptance filtering, multiple transmit buffers and deterministic bus arbitration without burdening the CPU. The 96 KB Flash accommodates CANopen or DeviceNet protocol stacks and Modbus bridging layers, while the 25 I/O drive digital sensors and actuators. ECAN reduces firmware complexity versus an external CAN controller, freeing the 40 MHz PIC18 core to handle real-time sensor reads and PWM outputs in factories and process plants.
מומלץ
Automotive Body Electronics / CAN Node
The PIC18F2685-I/SO is widely used in automotive body electronics where ECAN 2.0B and 5V operation are required. It handles window lifters, mirror controls, lighting clusters and seat modules, reading switches and driving relays or MOSFETs. Its 10-bit ADC samples sensor inputs while the USART/LIN block supports LIN sub-bus slaves. The PIC18F2685-I/SO is industrial grade (-40C to +85C); for under-hoon use, the AEC-Q100-grade PIC18F4685 in the same family is preferred. The 96 KB Flash stores diagnostic firmware and CAN bootloader image with self-programming support.
מומלץ
USB-to-CAN Bridge Companion
For USB-to-CAN bridges, the PIC18F2685-I/SO handles the CAN side while a USB host MCU manages the USB link, or vice versa. Its ECAN 2.0B controller, 3.25 KB RAM and 96 KB Flash make it suitable for protocol translation firmware, message filtering and buffering between CAN frames and a host-side serial interface. The MSSP (SPI/I2C) block can talk to a USB-UART bridge IC, while the USART (LIN) provides diagnostic passthrough. The 28-SOIC footprint keeps the bridge board compact for field engineers' laptops and bench tools.
מומלץ
Battery-Powered Remote Sensor Node
Using the PIC18F2685-I/SO's nanoWatt sleep modes, designers can build battery-powered remote sensor nodes that periodically wake, sample, transmit over CAN/LIN and return to deep sleep. Sleep currents in the microamp range (with the ADC and ECAN off) extend battery life across years of maintenance-free operation. The internal oscillator eliminates external crystals for cost-sensitive nodes, while the 1 KB EEPROM stores calibration and node-identity data across power cycles. CAN wakes the node only when an external command frames the node ID, minimizing bus activity.
מומלץ
Motor Control and BLDC / Stepper Driver Board
The PIC18F2685-I/SO drives small BLDC and stepper motors in industrial automation. Its three 16-bit timers generate complementary PWM outputs to FET half-bridges, while the 10-bit ADC samples back-EMF and current-sense amplifiers for closed-loop control. ECAN provides deterministic command bus integration into factory networks, allowing synchronized multi-axis motion. The 96 KB Flash fits state-space or field-oriented control (FOC) libraries, and the 25 I/O handle Hall sensors, end-stops and encoder inputs without external glue logic.
מומלץ
HVAC / Building Automation Controller
In HVAC and building-automation controllers, the PIC18F2685-I/SO manages CAN or LIN sub-networks that interconnect thermostats, damper actuators, fan coils and chiller controllers. The USART (LIN) connects to J2602 slave nodes, while ECAN connects the controller to the building's main BMS bus. The 10-bit ADC reads temperature and humidity sensors, and the comparators trip safety thresholds without CPU intervention. The 28-SOIC footprint fits into the small enclosures typical of wall-mounted HVAC controllers, and nanoWatt modes save power when displays are inactive.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18F2685-I/SO — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18F2680-I/SO | PIC18F2682-I/SO | PIC18F2685-E/SO | PIC18F2680-E/SP | PIC18F4585-I/SP | PIC18F4685-I/PT |
|---|---|---|---|---|---|---|---|
| Package | 28-SOIC (SO) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SPDIP/SP - same family footprint variant | 44-TQFP - different package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 96 KB | 96 KB - same | 80 KB (-17%) | 96 KB - same | 96 KB - same | 96 KB - same | 96 KB - same |
| RAM | 3.25 KB | 3.25 KB - same | 2.25 KB (-31%) | 3.25 KB - same | 3.25 KB - same | 3.25 KB - same | 3.25 KB - same |
| CAN Module | ECAN 2.0B active | CAN 1.0 | ECAN 2.0B active | ECAN 2.0B active - same | CAN 1.0 | ECAN 2.0B active | ECAN 2.0B active |
| Operating Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C |
| I/O Pins | 25 | 25 - same | 25 - same | 25 - same | 25 - same | 36 (40-pin) | 36 (44-pin) |
| Max Frequency | 40 MHz | 40 MHz - same | 40 MHz - same | 40 MHz - same | 40 MHz - same | 40 MHz - same | 40 MHz - same |
מבדילים עיקריים
- Integrated ECAN 2.0B active controller on-chip (לעומתPIC18F2680-I/SO)
- Full 96 KB Flash vs smaller Flash variants (לעומתPIC18F2682-I/SO)
- Extended temperature grade option in same package (לעומתPIC18F2685-I/SO (industrial))
- 28-SOIC footprint in Microchip's PIC18 CAN family (לעומתPIC18F4685-I/PT)
הערות תכנון
The PIC18F2685-I/SO operates from a single 4.2 V to 5.5 V supply on VDD (pins 11 and 19). Place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic capacitor on the rail. The internal regulator derives the 2.5 V core voltage; no external core decoupling is required beyond the pin-level bypass caps. In battery-powered designs, switch to nanoWatt sleep with the ECAN and ADC off to drop quiescent current to microamp levels.
Route the CAN bus as a 120-ohm-impedance differential pair from the ECAN TX/RX pins through the MCP2551 or TJA1050 transceiver to the bus connector. Place the transceiver within 25 mm of the MCU, keep stub lengths under 30 mm, and place 120-ohm termination resistors at each end of the bus. Keep the ECAN traces away from PWM, switching supply and crystal traces. The 28-SOIC footprint uses pin 11/28 (VDD) and pin 12/27 (VSS) for power; route power planes accordingly to minimize ground bounce.
Do not confuse the industrial -I grade (-40 C to +85 C) with the extended -E grade (-40 C to +125 C); choose PIC18F2685-E/SO for outdoor enclosures. The CAN 2.0B active mode (ECAN) is not the same as CAN 1.0; firmware written for PIC18F2680's CAN 1.0 register set will not run unmodified on the PIC18F2685. Always assert MCLR with a proper RC delay or reset supervisor to avoid code-execution lockups after brownouts. Reserve RB6/RB7 (PGC/PGD) for ICSP and never repurpose them as outputs in production designs.
Keep the crystal (or resonator) traces short and symmetric if using an external OSC. If using the internal oscillator at 40 MHz, configure OSCCON to select HFINTOSC and disable the OSC1/OSC2 pins as analog to save current. Place C1+/C1- or CCP PWM traces away from analog AN0-AN12 to avoid coupling. For ADC accuracy, route AVSS directly to the analog ground plane and add a small ferrite bead between VDD and AVDD.
מידע על תאימות
RoHS and lead-free compliant per Microchip product page; REACH compliant. Industrial temperature grade only; not AEC-Q100 qualified - choose PIC18F4685 for AEC-Q100 automotive. Conflict-minerals declaration available from Microchip.
