PIC18F4682-I/P - 8-bit MCU, 80KB Flash, ECAN, 40-PDIP
MPN: PIC18F4682-I/P ✓ Hoạt độngPIC18F4682-I/P Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals around an 8-bit data path, optimized for deterministic real-time control. PIC18 microcontrollers are part of Microchip's high-performance 8-bit family, sitting in the broader taxonomy: microcontroller -> embedded processor -> semiconductor. They excel in automotive, industrial, and consumer applications where reliability, low power, and a robust peripheral set are required.
Key features of the PIC18F4682 include 40 MHz operation delivering up to 10 MIPS, hardware ECAN 2.0B with full CAN 2.0A/B compliance, a 10-bit ADC with up to 11 channels, two USART modules for serial communication, an SPI and I2C interface, and nanoWatt power management with idle, sleep, and run modes. The device operates across the industrial temperature range of -40°C to +85°C, supports in-circuit serial programming (ICSP) and in-circuit debugging (ICD), and includes a brown-out reset (BOR) and watchdog timer for enhanced system reliability.
The PIC18F4682 uses an enhanced Harvard RISC architecture with separate program and data buses, a 16-bit instruction word, and 31-level hardware stack for fast context switching. The integrated ECAN module reduces software overhead by handling bus arbitration, filtering, and error handling in hardware, enabling deterministic communication on industrial and automotive CAN buses. This makes the PIC18F4682 well suited to networked embedded systems requiring reliable real-time messaging.
Typical applications include automotive body and chassis ECAN nodes, industrial CAN-based sensor networks, building automation, HVAC controls, motor control, and embedded data acquisition. The wide temperature range and ECAN hardware make it especially attractive for automotive and industrial environments where standard serial protocols are insufficient.
When designing with the PIC18F4682, allocate sufficient decoupling (100 nF + 10 µF) near the VDD pins, and observe the 40 MHz maximum clock with proper crystal load capacitor selection. For ECAN networks, terminate the bus with 120 Ω resistors at each end and configure the ECAN bit-timing registers to match the required baud rate.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18F4682-I/P — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC18F4682-I/P (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, ADC, CAN Module, Core.
PIC18F4680-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4585-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4620-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4685-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F448-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4682-I/P Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit enhanced Harvard RISC) |
| Program Memory (Flash) | 80 KB (40K x 16) |
| RAM | 3.3 KB (3328 bytes) |
| EEPROM | 1 KB (1024 bytes) |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, up to 11 channels |
| ECAN Module | ECAN 2.0B (CAN 2.0A/B compliant) |
| USART Modules | 2 |
| SPI Modules | 1 (MSSP) |
| I2C Modules | 1 (MSSP) |
| Timers | 4 (Timer0/1/2/3) |
| PWM Outputs | 5 channels (CCP/ECCP) |
| Hộp | 40-pin PDIP (P) |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (Industrial, 'I' suffix) |
| Programming/Debug | ICSP / ICD via 2-wire interface |
| Brown-out Reset (BOR) | Yes, programmable |
| Watchdog Timer (WDT) | Yes, with dedicated RC oscillator |
| nanoWatt Power Management | Yes (Run, Idle, Sleep modes) |
| Kiểu lắp đặt | Through-hole |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC18F4682-I/P
| Chân 1 | MCLR/RE3 — Master Clear (reset) input / digital I/O (port E bit 3) |
| Chân 2 | RA0/AN0 — Digital I/O / analog input 0 |
| Chân 3 | RA1/AN1 — Digital I/O / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / analog input 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI/C1OUT — Digital I/O / Timer0 clock input / Comparator 1 output |
| Chân 7 | RA5/AN4/SS/HLVDIN — Digital I/O / analog input 4 / SPI slave select / high/low voltage detect |
| Chân 8 | RE0/RD/AN5 — Digital I/O / read control for parallel port / analog input 5 |
| Chân 9 | RE1/WR/AN6 — Digital I/O / write control for parallel port / analog input 6 |
| Chân 10 | RE2/CS/AN7 — Digital I/O / chip select for parallel port / analog input 7 |
| Chân 11 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / digital I/O |
| Chân 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / digital I/O |
| Chân 15 | RC0/T1OSO/T13CKI — Digital I/O / Timer1 oscillator output / Timer1/3 clock input |
| Chân 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 PWM output |
| Chân 17 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — Digital I/O / parallel slave port data bit 0 |
| Chân 20 | RD1/PSP1 — Digital I/O / parallel slave port data bit 1 |
| Chân 21 | RD2/PSP2 — Digital I/O / parallel slave port data bit 2 |
| Chân 22 | RD3/PSP3 — Digital I/O / parallel slave port data bit 3 |
| Chân 23 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 24 | RC5/SDO — Digital I/O / SPI data out |
| Chân 25 | RC6/TX/CK — Digital I/O / USART async transmit / USART sync clock |
| Chân 26 | RC7/RX/DT — Digital I/O / USART async receive / USART sync data |
| Chân 27 | RD4/PSP4 — Digital I/O / parallel slave port data bit 4 |
| Chân 28 | RD5/PSP5 — Digital I/O / parallel slave port data bit 5 |
| Chân 29 | RD6/PSP6/TX2/CK2 — Digital I/O / PSP bit 6 / USART2 transmit |
| Chân 30 | RD7/PSP7/RX2/DT2 — Digital I/O / PSP bit 7 / USART2 receive |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Chân 33 | RB0/INT0/FLT0 — Digital I/O / external interrupt 0 / PWM fault input |
| Chân 34 | RB1/INT1 — Digital I/O / external interrupt 1 |
| Chân 35 | RB2/INT2/CANTX — Digital I/O / external interrupt 2 / ECAN transmit |
| Chân 36 | RB3/INT3/CANRX — Digital I/O / external interrupt 3 / ECAN receive |
| Chân 37 | RB4/KBI0 — Digital I/O / interrupt-on-change bit 0 |
| Chân 38 | RB5/KBI1 — Digital I/O / interrupt-on-change bit 1 |
| Chân 39 | RB6/KBI2/PGC — Digital I/O / interrupt-on-change bit 2 / ICSP clock |
| Chân 40 | RB7/KBI3/PGD — Digital I/O / interrupt-on-change bit 3 / ICSP data |
Ứng dụng tiêu biểu
PIC18F4682-I/P phù hợp cho 6 Áp dụngs: Automotive ECAN Body Control Module, Industrial CAN Sensor Hub, Building Automation Gateway, HVAC Control Unit, Automotive Instrument Cluster, Industrial Data Acquisition Module.
Automotive ECAN Body Control Module
The PIC18F4682's hardware ECAN 2.0B module makes it well suited for automotive body control modules that communicate with door, lighting, and HVAC subsystems over CAN bus. Its 80 KB Flash can hold a CANopen or J1939 protocol stack, while the 10-bit ADC reads analog sensor inputs such as thermistors for HVAC control. The 36 I/O pins drive relays and LEDs for body electronics, and the industrial temperature rating (-40 °C to +85 °C) handles under-dash thermal environments. Compared to software-bit-banged CAN, the hardware ECAN reduces CPU load by 40-60%, freeing cycles for sensor processing.
Được đề xuất
Industrial CAN Sensor Hub
In industrial sensor networks, the PIC18F4682 aggregates analog and digital sensor data and publishes it over ECAN to a central PLC. Its 10-bit ADC with 11 channels reads temperature, pressure, and flow sensors directly, while the ECAN module delivers deterministic 1 Mbps messaging for time-critical control loops. The 3.3 KB RAM holds transient sensor buffers, and the 40 MHz CPU runs at 10 MIPS, leaving headroom for sensor linearization routines. The nanoWatt power modes drop quiescent current below 5 µA in sleep, ideal for battery-backed industrial nodes.
Được đề xuất
Building Automation Gateway
The PIC18F4682 acts as a sub-bus gateway between CAN-based field devices (thermostats, lighting controllers) and a higher-level BACnet or Modbus network. Its dual USART modules bridge RS-485 and CAN networks, while the 80 KB Flash accommodates protocol translation tables. The 36 I/O pins handle local I/O expansion for HVAC damper and valve control. The watchdog timer and brown-out reset ensure unattended operation in building mechanical rooms, and the wide supply range (2.0 V to 5.5 V) tolerates industrial 24 V rails via simple regulators.
Được đề xuất
HVAC Control Unit
The PIC18F4682 controls variable-speed fans, compressor valves, and temperature setpoints in HVAC systems. Its 5 PWM channels (CCP/ECCP) drive brushless DC fan motors directly via gate drivers, while the 10-bit ADC reads supply air and return air thermistors. The ECAN module integrates the unit into a building automation network for centralized scheduling. nanoWatt power management reduces standby consumption below 1 mA, helping meet Energy Star requirements for HVAC controllers.
Được đề xuất
Automotive Instrument Cluster
The PIC18F4682 can serve as a secondary processor in instrument clusters, driving gauge stepper motors and reading vehicle CAN messages for speed, RPM, and fuel level. Its 80 KB Flash supports lookup tables for gauge calibration, and the 40 MHz throughput delivers smooth pointer movement without visible stepping. The hardware ECAN filters incoming messages to reduce CPU load, and the 36 I/O pins drive multiple gauge motors and indicator LEDs. Industrial temperature rating handles engine-bay thermal stress.
Được đề xuất
Industrial Data Acquisition Module
The PIC18F4682 functions as a standalone data acquisition front-end, digitizing analog signals with its 10-bit ADC and timestamping samples before forwarding them over CAN. Its 3.3 KB RAM stores burst samples during ECAN bus arbitration delays, and the hardware ECAN ensures deterministic delivery to upstream loggers. The 1 KB EEPROM retains calibration coefficients across power cycles. With industrial temperature rating and 40 MHz performance, the PIC18F4682 fits ruggedized factory-floor measurement equipment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F4682-I/P — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC18F4680-I/P | PIC18F4585-I/P | PIC18F4620-I/P | PIC18F4685-I/P | PIC18F448-I/P |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 80 KB | 80 KB | 48 KB | 64 KB | 96 KB | 16 KB |
| CAN Module | ECAN 2.0B | Legacy CAN | ECAN 2.0B | Legacy CAN | ECAN 2.0B | Legacy CAN |
| RAM | 3.3 KB | 3.3 KB | 3.3 KB | 3.9 KB | 3.3 KB | 0.77 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 0.25 KB |
| ADC Resolution | 10-bit, 11 channels | 10-bit, 11 channels | 10-bit, 11 channels | 10-bit, 13 channels | 10-bit, 11 channels | 10-bit, 8 channels |
| Maximum Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
Bảo phân biệt quan trọng
- Hardware ECAN 2.0B with acceptance filtering (vsPIC18F4680-I/P)
- More Flash memory for protocol stacks (vsPIC18F4585-I/P)
- Larger Flash for firmware growth headroom (vsPIC18F4685-I/P)
- Higher Flash and RAM than older PIC18F448 (vsPIC18F448-I/P)
Ghi chú thiết kế
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 11 and 32), with an additional 10 µF bulk capacitor at the supply entry point. The PIC18F4682's ADC is sensitive to supply noise; if the ECAN bus shares the same rail, add a ferrite bead between the digital and analog VDD nodes to prevent switching transients from coupling into ADC measurements. The internal voltage regulator does not require external pass components, but the AVDD pin should be tied to VDD with its own 100 nF bypass.
The 40-pin PDIP is a through-hole package with 2.54 mm pitch. For reliable hand-soldering, use plated through-holes with at least 0.5 mm annular ring. Keep high-current traces (relay drivers) physically separated from the analog ADC inputs (RA0-RA5) by at least 3 mm to avoid capacitive coupling. Route the ECAN differential pair (CANTX/CANRX at pins 35/36) as short and balanced as possible, with 120 Ω termination at each end of the bus.
Configuration bits must be set correctly to enable the internal oscillator, disable the watchdog for debugging, and configure the brown-out reset voltage. Failing to set CONFIG4H can leave the MCU in an unprogrammed state where ICSP does not respond. Always issue a 'Bulk Erase' command via the debugger before re-flashing a new configuration. Also note that the MCLR pin (pin 1) requires a 10 kΩ pull-up to VDD for normal operation; leaving it floating causes intermittent resets.
For ECAN at 1 Mbps, the bus topology must be a single daisy-chained line with 120 Ω termination at both physical ends. Avoid stubs longer than 0.3 m; star topologies cause reflections that corrupt bit timing. The MCP2551 transceiver (or equivalent) handles the 3.3V-to-5V level shifting and bus dominant/recessive drive; the PIC18F4682's CANTX/CANRX pins connect directly to the transceiver's TXD/RXD.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip material declarations. Industrial temperature grade (-40°C to +85°C) but not AEC-Q100 automotive qualified. For AEC-Q100 qualified alternatives, consider PIC18F4682-I/ML in automotive-qualified QFN package.
