PIC18LF2685T-I/SO - 8-Bit 40MHz 96KB Flash MCU | Microchip
MPN： PIC18LF2685T-I/SO ✓ 啟用中PIC18LF2685T-I/SO 概覽
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.
直接替換替代品，適用於 PIC18LF2685T-I/SO — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF2685T-I/SO （相同外形與佔位） — 差異在於 I/O Pins, Operating Temperature, Package, Timers, ADC.
PIC18LF2682T-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18F2685T-I/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF2685-I/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF258T-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF2685T-I/SO 最大額定值與電氣特性
| 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 |
| 工作溫度 | -40C to +85C (Industrial "I" grade) |
| 封裝 | 28-pin SOIC wide (0.295" / 7.50 mm body), Tape & Reel ("T") |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
PIC18LF2685T-I/SO 腳位配置
| 腳位 1 | /MCLR — Master Clear (reset) input, active low |
| 腳位 2 | RA0 — Digital I/O / analog input AN0 |
| 腳位 3 | RA1 — Digital I/O / analog input AN1 |
| 腳位 4 | RA2 — Digital I/O / analog input AN2 / VREF- |
| 腳位 5 | RA3 — Digital I/O / analog input AN3 / VREF+ |
| 腳位 6 | RA4 — Digital I/O (open-drain) |
| 腳位 7 | RA5 — Digital I/O / analog input AN4 |
| 腳位 8 | VSS — Ground reference |
| 腳位 9 | OSC1 — Crystal oscillator / clock input |
| 腳位 10 | OSC2 — Crystal oscillator output |
| 腳位 11 | RC0 — Digital I/O / Timer1 oscillator |
| 腳位 12 | RC1 — Digital I/O / CCP2 |
| 腳位 13 | RC2 — Digital I/O / CCP1 / PWM |
| 腳位 14 | RC3 — Digital I/O / SCL (I2C clock) |
| 腳位 15 | RC4 — Digital I/O / SDA (I2C data) |
| 腳位 16 | RC5 — Digital I/O |
| 腳位 17 | RC6 — Digital I/O / CANTX (ECAN transmit) |
| 腳位 18 | RC7 — Digital I/O / CANRX (ECAN receive) |
| 腳位 19 | VSS — Ground reference |
| 腳位 20 | VDD — Positive supply (2.0 V to 5.5 V) |
| 腳位 21 | RB0 — Digital I/O / external interrupt INT0 |
| 腳位 22 | RB1 — Digital I/O / external interrupt INT1 |
| 腳位 23 | RB2 — Digital I/O / external interrupt INT2 |
| 腳位 24 | RB3 — Digital I/O / external interrupt INT3 |
| 腳位 25 | RB4 — Digital I/O / IOC |
| 腳位 26 | RB5 — Digital I/O / IOC |
| 腳位 27 | RB6 — Digital I/O / PGC (ICSP clock / ICD) |
| 腳位 28 | RB7 — Digital I/O / PGD (ICSP data / ICD) |
典型應用
PIC18LF2685T-I/SO 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF2685T-I/SO — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- On-chip ECAN (CAN 2.0B active) with hardware acceptance filtering (對比PIC18LF258T-I/SO)
- Wide 2.0 V to 5.5 V LF operating range vs F-variant 4.2 V to 5.5 V (對比PIC18F2685T-I/SO)
- 96 KB Flash in the 28-SOIC package (對比PIC18LF2682T-I/SO)
設計說明
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).
合規資訊
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.
