PIC18F4685-I/P - 8-bit MCU 96KB Flash ECAN 40-PDIP | Microchip
MPN: PIC18F4685-I/P ✓ פעילPIC18F4685-I/P סקירה
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O. The PIC18F family represents Microchip's high-performance 8-bit architecture with a 16-bit instruction word and 8-bit data path, optimized for deterministic real-time control. Within the MCU hierarchy, the PIC18F4685 sits in the ECAN-equipped automotive/industrial subgroup, adding Controller Area Network 2.0B hardware acceleration critical for in-vehicle networking, factory automation, and distributed sensor systems.
Key features include an integrated ECAN module supporting CAN 2.0B active with eight acceptance filters and three acceptance masks, an 11-channel 10-bit ADC with up to 100 ksps conversion, multiple PWM and Capture/Compare modules, and nanoWatt power-saving modes that drop quiescent current below 100 nA in sleep. Up to 36 digital I/O pins are available with interrupt-on-change capability on several ports.
The PIC18F4685 architecture uses a RISC-like instruction set with hardware multiply, an 8 × 8 single-cycle multiplier, and a 31-level hardware stack. The 40 MHz oscillator yields a 100 ns instruction cycle, making the device well-suited to time-critical control loops. On-chip in-circuit debug (ICD) and self-programmability support field upgrades via the standard 2-wire ICSP interface.
Typical applications include automotive body and powertrain ECUs, industrial CAN nodes, building automation gateways, HVAC fan/blower controllers, sensor hubs with local decision-making, and embedded control boards where a robust 8-bit core plus CAN bus simplifies system partitioning. The wide operating temperature range of -40 °C to +85 °C covers industrial and automotive interiors.
When designing with the PIC18F4685-I/P, choose the PDIP package only when through-hole assembly, easy breadboarding, or hand-prototyping is required - otherwise select the TQFP-44 (PT), QFN-44 (ML), or SOIC-40 (SP) variants for SMD production. Ensure the CAN bus is terminated with 120 Ω at each end and that the ECAN baud rate prescaler matches the oscillator frequency.
This page synthesizes distributor pricing, drop-in same-package alternatives, ICSP debug notes, and application-specific guidance not present in the bare Microchip datasheet.
חלופות תחליף ישיר עבור PIC18F4685-I/P — 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 PIC18F4685-I/P (אותו גורם צורה וטביעת רגל) — שונים ב Package, Program Memory (Flash), Operating Temperature, Core Architecture, ADC.
PIC18F4680-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4585-I/PT
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4682-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4525-I/PT
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4580-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4480-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4515-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F4685-I/P דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | PIC18 (8-bit, 16-bit instruction word) |
| Program Memory (Flash) | 96 KB (48K x 16) |
| SRAM | 3,328 bytes |
| EEPROM | 1 KB |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 11 x 10-bit, up to 100 ksps |
| CAN Module | ECAN 2.0B active |
| PWM Outputs | 5 (ECCP + CCP) |
| Timers | 4 (Timer0/1/2/3) |
| Communication | ECAN, USART, SPI, I2C (MSSP) |
| מארז | 40-pin PDIP (600 mil) |
| סוג הרכבה | Through-Hole |
| טמפרטורת פעולה | -40 °C to +85 °C (Industrial) |
| ICSP / ICD | Yes (2-wire In-Circuit Serial Programming) |
| סטטוס RoHS | Compliant |
תצורת פינים של PIC18F4685-I/P
| פין 1 | MCLR/RE3 — Master Clear (Reset) input / digital I/O |
| פין 2 | RA0/AN0 — Digital I/O / Analog input 0 |
| פין 3 | RA1/AN1 — Digital I/O / Analog input 1 |
| פין 4 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC negative reference |
| פין 5 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| פין 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| פין 7 | RA5/AN4/SS/HLVDIN — Digital I/O / Analog input 4 / SPI Slave Select / High-Low Voltage Detect input |
| פין 8 | RE0/RD/AN5 — Digital I/O / Parallel port read / Analog input 5 |
| פין 9 | RE1/WR/AN6 — Digital I/O / Parallel port write / Analog input 6 |
| פין 10 | RE2/CS/AN7 — Digital I/O / Parallel port chip select / Analog input 7 |
| פין 11 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| פין 12 | VSS — Ground reference |
| פין 13 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / digital I/O |
| פין 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / digital I/O |
| פין 15 | RC0/T1OSO/T13CKI — Digital I/O / Timer1 oscillator output / Timer1/3 clock input |
| פין 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / Capture/Compare/PWM 2 |
| פין 17 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM 1 |
| פין 18 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| פין 19 | RD0/PSP0 — Digital I/O / Parallel Slave Port bit 0 |
| פין 20 | RD1/PSP1 — Digital I/O / Parallel Slave Port bit 1 |
| פין 21 | RD2/PSP2 — Digital I/O / Parallel Slave Port bit 2 |
| פין 22 | RD3/PSP3 — Digital I/O / Parallel Slave Port bit 3 |
| פין 23 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| פין 24 | RC5/SDO — Digital I/O / SPI data out |
| פין 25 | RC6/TX/CK — Digital I/O / USART transmit / USART clock / CAN TX |
| פין 26 | RC7/RX/DT — Digital I/O / USART receive / USART data / CAN RX |
| פין 27 | RD4/PSP4 — Digital I/O / Parallel Slave Port bit 4 |
| פין 28 | RD5/PSP5 — Digital I/O / Parallel Slave Port bit 5 |
| פין 29 | RD6/PSP6 — Digital I/O / Parallel Slave Port bit 6 |
| פין 30 | RD7/PSP7 — Digital I/O / Parallel Slave Port bit 7 |
| פין 31 | VSS — Ground reference |
| פין 32 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| פין 33 | RB0/INT0/FLT0 — Digital I/O / External interrupt 0 / PWM Fault input |
| פין 34 | RB1/INT1 — Digital I/O / External interrupt 1 |
| פין 35 | RB2/INT2/CANTX — Digital I/O / External interrupt 2 / CAN TX alternate |
| פין 36 | RB3/INT3/CANRX — Digital I/O / External interrupt 3 / CAN RX alternate |
| פין 37 | RB4/KBI0 — Digital I/O / Interrupt-on-change bit 0 |
| פין 38 | RB5/KBI1/PGM — Digital I/O / Interrupt-on-change bit 1 / LVP programming |
| פין 39 | RB6/KBI2/PGC — Digital I/O / Interrupt-on-change bit 2 / ICSP clock |
| פין 40 | RB7/KBI3/PGD — Digital I/O / Interrupt-on-change bit 3 / ICSP data |
יישומים טיפוסיים
PIC18F4685-I/P מתאים עבור 6 יישוםs: Industrial CAN Node / Fieldbus Gateway, Automotive Body Control Module, HVAC Fan / Blower Controller, Building Automation Sensor Hub, Educational Microcontroller Trainer, Embedded Data Acquisition Module.
Industrial CAN Node / Fieldbus Gateway
The PIC18F4685-I/P is purpose-built for CAN 2.0B industrial networking. Its integrated ECAN module with eight acceptance filters and three acceptance masks offloads message filtering from the CPU, allowing the 10 MIPS core to focus on application logic. The 96 KB Flash fits full CANopen or DeviceNet protocol stacks, and 3,328 bytes of SRAM handles incoming CAN frames comfortably. Operating from 2.0 V to 5.5 V supports both 24 V bus-powered (post-regulator) and 3.3 V logic designs without re-spin. The 40-pin PDIP package makes this part easy to prototype and rework, which is critical for industrial gateway designs that iterate across multiple protocols.
מומלץ
Automotive Body Control Module
The PIC18F4685-I/P is widely used in automotive body controllers managing lighting, door modules, mirror controls, and seat positioning. The ECAN module handles the vehicle body CAN bus, while the 11-channel 10-bit ADC reads multiple sensors (temperature, position, current) simultaneously. The 5 PWM outputs drive LED dimming, mirror actuators, and motor speed control. With industrial -40 °C to +85 °C temperature range and nanoWatt sleep modes drawing less than 100 nA, it supports always-on body networks with battery-friendly quiescent current. The 40-PDIP package simplifies early prototype builds for bench validation before transitioning to TQFP-44 for production.
מומלץ
HVAC Fan / Blower Controller
The PIC18F4685-I/P drives variable-speed blower motors in HVAC systems using its ECCP module with hardware PWM and the 11-channel ADC for closed-loop speed feedback. The 40 MHz clock and 10 MIPS throughput handle real-time PID control loops with sub-millisecond update rates, while the 96 KB Flash holds complex control algorithms including soft-start, stall detection, and adaptive filtering. nanoWatt idle modes reduce quiescent current when the blower is off, supporting Energy Star efficiency targets. The 40-PDIP package is ideal for through-hole industrial controllers that must withstand vibration and high humidity in plenums and air-handler units.
מומלץ
Building Automation Sensor Hub
The PIC18F4685-I/P serves as a distributed sensor hub in BACnet or Modbus building automation networks. It aggregates data from multiple sensor types via the 11-channel ADC and digital I/O, performs local threshold logic, and reports consolidated readings over CAN or USART. The 3,328 bytes of SRAM buffer incoming sensor data, while the ECAN module publishes to a central building management system. nanoWatt sleep modes extend battery life in wireless hybrid nodes that transmit periodically. The 40-PDIP form factor is preferred for retrofit installations where through-hole replacement simplifies service and field upgrades without disturbing existing wiring.
מומלץ
Educational Microcontroller Trainer
The PIC18F4685-I/P is a popular choice in university and vocational training labs because the 40-pin PDIP package fits standard 0.6-inch-wide DIP sockets, the breadboard-friendly footprint simplifies student lab work, and the PIC18 architecture's orthogonal instruction set makes assembly language teaching tractable. The 96 KB Flash accommodates large student projects including CAN protocol stacks, ADC sampling exercises, and PWM motor control labs. ICSP support via the 2-wire PGC/PGD interface on RB6/RB7 allows real-time in-circuit debugging using the PICkit 5 or ICD 4, so instructors can pause execution and inspect registers during lab sessions.
מומלץ
Embedded Data Acquisition Module
The PIC18F4685-I/P is well-suited for stand-alone data loggers and process monitoring modules. The 11-channel 10-bit ADC at 100 ksps samples analog inputs at rates sufficient for vibration, temperature, and pressure monitoring. The 3,328-byte SRAM acts as a circular buffer for time-stamped events, while the 96 KB Flash stores user configuration and custom calibration tables. The 1 KB EEPROM retains logged data through power cycles. ECAN enables the logger to publish events to a plant-wide SCADA network. The 40-PDIP through-hole package provides mechanical robustness in industrial cabinet installations subject to vibration and thermal cycling.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18F4685-I/P — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18F4680-I/P | PIC18F4585-I/P | PIC18F4682-I/P | PIC18F4525-I/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Program Memory (Flash) | 96 KB | 64 KB | 48 KB | 80 KB | 48 KB |
| SRAM | 3,328 bytes | 3,328 bytes | 3,328 bytes | 3,328 bytes | 3,984 bytes |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| CAN Module | ECAN 2.0B | ECAN 2.0B | CAN 1.0B | CAN 1.0B | None |
| ADC | 11 x 10-bit | 11 x 10-bit | 11 x 10-bit | 11 x 10-bit | 13 x 10-bit |
| Maximum Clock | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| Operating Voltage | 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 | 2.0 V to 5.5 V |
מבדילים עיקריים
- Largest Flash in the ECAN 2.0B PIC18F 40-PDIP family (לעומתPIC18F4680-I/P)
- True ECAN 2.0B active with 8 acceptance filters (לעומתPIC18F4585-I/P)
- CAN bus + full 96 KB Flash in 40-PDIP (לעומתPIC18F4525-I/P)
הערות תכנון
The PIC18F4685-I/P requires decoupling on each VDD/VSS pair. Place a 100 nF ceramic capacitor as close as possible to each of the two VDD pins (11 and 32) and a single 10 µF tantalum or ceramic bulk capacitor near the MCU. nanoWatt sleep modes draw less than 100 nA at 2 V, so a clean supply is essential for sleep-current measurements to reflect real application draw. Avoid switching the VDD rail near the crystal oscillator pins to prevent jitter on timer1 or the ECAN baud rate clock.
The ECAN bus must be terminated with 120 Ω resistors at each physical end of the bus segment, NOT at every node. Use twisted-pair cable with characteristic impedance of 120 Ω and keep stub lengths under 30 cm. Common-mode choke and TVS protection (such as PESD1CAN) are recommended for industrial environments. The PIC18F4685-I/P CAN bit timing must be configured per the CiA 601-1 recommendation: sample point at 87.5% of the bit time for 1 Mbit/s and 80% for lower baud rates.
Three common PIC18F4685-I/P pitfalls: (1) configuring PGC/PGD on RB6/RB7 in standard I/O mode disables ICSP - always leave CONFIG bits LVP and DEBUG in default unless alternate configuration is intentional; (2) the ECAN module must be switched to configuration mode (REQOP = 100) before writing to acceptance filter registers; (3) the ADC requires the acquisition time TACQ to elapse before starting conversion - failure to wait causes reduced accuracy especially on high-impedance sources above 10 kΩ.
The PIC18F4685-I/P in 40-PDIP package has excellent thermal dissipation due to the through-hole leads. Estimated: at 40 MHz with full I/O switching (36 outputs at 20 pF each), internal dissipation is approximately 90 mW, well within the 1 W package limit. For SMD variants (TQFP-44, QFN-44), reduce switching frequency or output load to stay within the lower ~700 mW SMD thermal budget.
מידע על תאימות
RoHS and REACH compliance per Microchip product page. The -I/P industrial grade carries -40 °C to +85 °C rating; AEC-Q100 automotive qualification requires the dedicated -EQ or automotive suffix part numbers.
