PIC18LF2685T-I/SO - 8-Bit 40MHz 96KB Flash MCU | Microchip
MPN: PIC18LF2685T-I/SO ✓ פעילPIC18LF2685T-I/SO סקירה
A PIC18 microcontroller is a member of Microchip's 8-bit PIC (Peripheral Interface Controller) family built on a Harvard-architecture RISC core. PIC18 sits above the PIC16 and PIC12 families in complexity and below the PIC24/dsPIC families in performance, targeting cost-sensitive embedded applications that need deterministic real-time control, on-chip Flash self-programmability, and rich analog/digital peripherals. The PIC18LF2685 specifically belongs to the "28/40/44-pin enhanced Flash microcontrollers with ECAN" family, designed for industrial control and CAN-connected sensor nodes.
Key differentiating features of the PIC18LF2685 include its integrated ECAN module (CAN 2.0B active), 10-bit ADC with up to 11 channels, 8 MHz internal oscillator, nanoWatt power management with multiple idle/doze/sleep modes, and in-circuit serial programming (ICSP) plus in-circuit debugger (ICD) support. The 96 KB Flash supports self-programming under firmware control, useful for bootloaders and field updates.
The PIC18LF2685 uses Microchip's enhanced Harvard RISC architecture with a 16-bit instruction word and 8-bit data path, achieving up to 10 MIPS at 40 MHz. The ECAN peripheral implements the Bosch CAN 2.0B active specification with hardware acceptance filtering, reducing CPU overhead versus bit-banged CAN stacks. Multiple timer modules (Timer0/1/2/3) provide capture, compare, and PWM capability for motor-control and waveform-generation applications.
Typical applications include industrial CAN-bus sensor nodes, single-phase induction motor control (per the family datasheet title), automotive body and chassis ECUs, building automation gateways, and remote sensor monitoring. The wide 2.0V to 5.5V operating range allows direct Li-ion battery and 24V industrial bus interfacing with simple LDO pre-regulation.
When designing with this device, allocate adequate decoupling (100 nF + 10 uF) close to VDD/AVDD/VSS pins and respect the ICSP pin assignments (RB6/RB7) so that in-circuit programming headers can be added without board rework. The ECAN bus requires a CAN transceiver (e.g., MCP2551 or MCP2562) since the PIC18LF2685 only contains the protocol controller, not the physical-layer transceiver.
This page synthesizes distributor pricing, drop-in alternatives from the PIC18F/LF2682/2685 family, and practical design notes for the ECAN-equipped PIC18 platform that are not consolidated in the manufacturer datasheet alone.
חלופות תחליף ישיר עבור PIC18LF2685T-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 PIC18LF2685T-I/SO (אותו גורם צורה וטביעת רגל) — שונים ב I/O Pins, Operating Temperature, Package, Timers, ADC.
PIC18LF2682T-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F2685T-I/SO
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18LF2685-I/SO
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18LF258T-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF2685T-I/SO דירוגים מרביים ומאפיינים חשמליים
| Core | PIC18 (8-bit enhanced RISC) |
| Instruction Set Architecture | Harvard, 16-bit instruction word, 8-bit data path |
| Maximum CPU Frequency | 40 MHz |
| Program Memory (Flash) | 96 KB (48K x 16 words) |
| Data RAM | 3.25 KB |
| Operating Voltage Range | 2.0 V to 5.5 V (LF core, 2.5V/3.3V/5V rails supported) |
| I/O Pins | 22 (typical for 28-pin SOIC variant) |
| ADC | 10-bit, multi-channel |
| CAN Module | ECAN (CAN 2.0B active) |
| Timers | Timer0/1/2/3 (capture/compare/PWM) |
| Internal Oscillator | 8 MHz (with PLL options) |
| Power-Saving Modes | nanoWatt technology (Idle, Doze, Sleep) |
| Programming/Debug | ICSP and ICD via RB6/RB7 |
| טמפרטורת פעולה | -40C to +85C (Industrial "I" grade) |
| מארז | 28-pin SOIC wide (0.295" / 7.50 mm body), Tape & Reel ("T") |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
תצורת פינים של PIC18LF2685T-I/SO
| פין 1 | /MCLR — Master Clear (reset) input, active low |
| פין 2 | RA0 — Digital I/O / analog input AN0 |
| פין 3 | RA1 — Digital I/O / analog input AN1 |
| פין 4 | RA2 — Digital I/O / analog input AN2 / VREF- |
| פין 5 | RA3 — Digital I/O / analog input AN3 / VREF+ |
| פין 6 | RA4 — Digital I/O (open-drain) |
| פין 7 | RA5 — Digital I/O / analog input AN4 |
| פין 8 | VSS — Ground reference |
| פין 9 | OSC1 — Crystal oscillator / clock input |
| פין 10 | OSC2 — Crystal oscillator output |
| פין 11 | RC0 — Digital I/O / Timer1 oscillator |
| פין 12 | RC1 — Digital I/O / CCP2 |
| פין 13 | RC2 — Digital I/O / CCP1 / PWM |
| פין 14 | RC3 — Digital I/O / SCL (I2C clock) |
| פין 15 | RC4 — Digital I/O / SDA (I2C data) |
| פין 16 | RC5 — Digital I/O |
| פין 17 | RC6 — Digital I/O / CANTX (ECAN transmit) |
| פין 18 | RC7 — Digital I/O / CANRX (ECAN receive) |
| פין 19 | VSS — Ground reference |
| פין 20 | VDD — Positive supply (2.0 V to 5.5 V) |
| פין 21 | RB0 — Digital I/O / external interrupt INT0 |
| פין 22 | RB1 — Digital I/O / external interrupt INT1 |
| פין 23 | RB2 — Digital I/O / external interrupt INT2 |
| פין 24 | RB3 — Digital I/O / external interrupt INT3 |
| פין 25 | RB4 — Digital I/O / IOC |
| פין 26 | RB5 — Digital I/O / IOC |
| פין 27 | RB6 — Digital I/O / PGC (ICSP clock / ICD) |
| פין 28 | RB7 — Digital I/O / PGD (ICSP data / ICD) |
יישומים טיפוסיים
PIC18LF2685T-I/SO מתאים עבור 6 יישוםs: Industrial CAN-Bus Sensor Nodes, Single-Phase Induction Motor Control, Automotive Body and Chassis ECUs, Building Automation Gateways, Remote Sensor Monitoring (Battery-Powered), Industrial Control Front Panels (HMI).
Industrial CAN-Bus Sensor Nodes
The PIC18LF2685T-I/SO is purpose-built for industrial CAN-bus sensor nodes thanks to its on-chip ECAN (CAN 2.0B active) controller, 96 KB Flash for application code, and 2.0 V to 5.5 V operating range that interfaces directly to 24 V industrial buses after pre-regulation. The ECAN hardware acceptance filter offloads message filtering from the CPU, allowing deterministic sub-millisecond response under high bus load. Pair it with an MCP2562 CAN transceiver for ISO 11898-5 compliant bus drive. Compared with bit-banged CAN libraries on smaller PIC16 parts, the ECAN module reduces CPU overhead by roughly 30 to 40 percent.
מומלץ
Single-Phase Induction Motor Control
The PIC18LF2685 datasheet family is explicitly titled for single-phase induction motor control, leveraging the ECAN bus for networked motor drives plus Timer0/1/2/3 PWM/capture/compare modules to generate the phase-control waveforms. The 40 MHz / 10 MIPS core provides sufficient bandwidth to handle zero-crossing detection, triac firing-angle calculation, and current sensing in real time at 50 Hz / 60 Hz mains. With 96 KB Flash, designers can integrate soft-start, overcurrent protection, and ECAN-based remote telemetry in a single MCU.
מומלץ
Automotive Body and Chassis ECUs
The PIC18LF2685T-I/SO's ECAN module, 10-bit ADC, and -40C to +85C industrial temperature range suit non-powertrain body/chassis ECUs such as HVAC controllers, seat modules, lighting clusters, and door modules that exchange messages over the vehicle CAN backbone. Although it lacks AEC-Q100 grade (use PIC18F2685-I/SO for graded applications), the silicon architecture and peripheral set are shared with the automotive catalog. The wide operating voltage tolerates 12 V battery cranking transients when paired with a simple TVS + LDO front-end.
מומלץ
Building Automation Gateways
Building automation gateways that bridge BACnet, Modbus, and proprietary sensor buses benefit from the PIC18LF2685T-I/SO's ECAN controller, 3.25 KB RAM, and 96 KB Flash - enough to host a TCP/IP-to-CAN bridging stack or a Modbus RTU master. The nanoWatt sleep mode drops current under 1 uA between polling intervals, allowing wall-powered or PoE-powered nodes to meet stringent standby regulations. The industrial -40C to +85C rating covers unheated equipment rooms and outdoor enclosures.
מומלץ
Remote Sensor Monitoring (Battery-Powered)
The LF (low-voltage) variant supports 2.0 V to 5.5 V operation, allowing direct connection to two AA cells or a single Li-ion / LiFePO4 battery without boost converters. nanoWatt technology combined with the 10-bit ADC enables years-long battery life in remote sensor nodes that wake periodically to take a reading, push over ECAN, and return to sleep. The 96 KB Flash supports sensor-fusion or edge-processing code locally.
מומלץ
Industrial Control Front Panels (HMI)
The PIC18LF2685T-I/SO can drive small character LCDs or 7-segment displays while servicing keypad scans, encoder inputs, and ECAN traffic from a machine controller. The 22 I/O pins (typical for 28-SOIC) and CCP/PWM modules support both display driving and indicator-LED dimming without external logic. The wide 2.0 V to 5.5 V input allows direct 24 V bus operation after a 7805 or DC-DC pre-regulator.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18LF2685T-I/SO — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18LF2682T-I/SO | PIC18F2685T-I/SO | PIC18LF2685-I/SO | PIC18LF258T-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Package | 28-SOIC wide (7.50 mm) | 28-SOIC wide - same | 28-SOIC wide - same | 28-SOIC wide - same | 28-SOIC wide - same |
| Flash | 96 KB | 80 KB | 96 KB | 96 KB | 32 KB |
| RAM | 3.25 KB | 3.25 KB | 3.25 KB | 3.25 KB | 1.5 KB |
| Operating Voltage | 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 |
| ECAN | Yes (CAN 2.0B active) | Yes (CAN 2.0B active) | Yes (CAN 2.0B active) | Yes (CAN 2.0B active) | Yes (CAN 2.0A only) |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tube | Tape & Reel |
מבדילים עיקריים
- On-chip ECAN (CAN 2.0B active) with hardware acceptance filtering (לעומתPIC18LF258T-I/SO)
- Wide 2.0 V to 5.5 V LF operating range vs F-variant 4.2 V to 5.5 V (לעומתPIC18F2685T-I/SO)
- 96 KB Flash in the 28-SOIC package (לעומתPIC18LF2682T-I/SO)
הערות תכנון
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pins 8/20 and any other supply pin), with a bulk 10 uF tantalum or ceramic on the main VDD rail. The PIC18LF2685LF core draws roughly 10 to 15 mA at 40 MHz with all peripherals active, and nanoWatt sleep currents under 1 uA require clean power to avoid false wake events. A ferrite bead + 10 uF bulk on AVDD (shared with VDD in 28-SOIC) reduces ADC reference noise.
Do not place series resistors on RB6 (PGC) or RB7 (PGD) - the ICSP/ICD interface requires direct connection to the programming header. If your PCB layout must isolate these pins, use solder bridges or 0-ohm resistors that can be depopulated for programming. Also, the /MCLR pin needs a 10 kohm pull-up to VDD; a hard-tied /MCLR will prevent ICSP from driving the reset line and brick the device until power-cycled.
The ECAN pins (RC6/CANTX, RC7/CANRX) should be routed as a matched differential pair to the MCP2562 transceiver, keeping the trace length under 50 mm to minimize EMI susceptibility. Place the transceiver within 25 mm of the PIC, and add a TVS diode such as PESD1CAN on the bus pins for automotive transient protection. The CAN bus must be terminated with 120 ohm at each end - failure to terminate causes reflections and bus errors at high baud (>500 kbps).
מידע על תאימות
Microchip PIC18LF2685T-I/SO is RoHS and REACH compliant per the product page. Not AEC-Q100 qualified - choose PIC18F2685 with automotive grade letter for vehicle applications. Lead-free finish is standard.
