PIC18F4685-I/PT - 8-bit 40MHz 96KB Flash MCU w/ ECAN | Microchip
料号： PIC18F4685-I/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.2 | $9.20 |
| 10 | $8.45 | $84.50 |
| 100 | $7.1 | $710.00 |
| 500 | $6.25 | $3,125.00 |
| 1,000 | $5.65 | $5,650.00 |
PIC18F4685-I/PT 概述
An 8-bit microcontroller is a CPU whose internal datapath and arithmetic logic unit process eight bits per clock; it is widely used in cost-sensitive and deterministic embedded designs. PIC18 fuses 8-bit legacy code compatibility with enhanced 16-bit-wide instruction words, enabling C-compiler-friendly code density while keeping peripheral integration high. PIC18F4685 sits inside the PIC18F family, which is Microchip's mid-range 8-bit MCU line used across automotive, industrial, and consumer embedded designs. The category hierarchy is: PIC18F4685 -> PIC18 microcontroller -> 8-bit MCU -> microcontroller -> embedded IC.
Key features include 3328 bytes of RAM, 1024 bytes of EEPROM, 36 digital I/O lines, an 11-channel 10-bit ADC, and nanoWatt Technology for ultra-low-power idle, sleep, and deep-sleep modes. The device operates from 4.2V to 5.5V across the industrial -40C to +85C temperature range. Serial interfaces include ECAN, I2C/SPI (MSSP), and an enhanced USART; two CCP/ECCP modules provide PWM and capture/compare. The TQFP-44 footprint is the standard 10x10 mm body with 0.8 mm pitch.
The PIC18F4685 uses a Harvard RISC architecture with a hardware 8x8 multiplier, achieving 10 MIPS at 40 MHz. Its ECAN module is CAN 2.0B active compliant, supporting both standard and extended identifiers, filters, and masks for in-vehicle body and powertrain networks. nanoWatt Technology drops idle current into the microamp range, extending battery life in portable sensor nodes. The device supports in-circuit serial programming (ICSP) and in-circuit debugging through ICD.
Typical applications include automotive ECAN body and chassis networks, industrial CAN-bus sensor nodes, HVAC control systems, motor-control interfaces, building automation nodes, and embedded sensor hubs requiring 10-bit analog digitization and moderate on-chip storage.
When designing with this device, note that VDD/AVDD must be decoupled with at least 0.1 uF ceramic capacitors placed within 5 mm of each power pin. The ECAN transceiver must be a separate external chip such as the MCP2551 or MCP2561; the PIC18F4685 contains only the protocol layer, not the physical layer.
This page synthesizes distributor pricing, parametric data, and drop-in alternatives drawn from Microchip product family datasheets and XAIPART's curated engineering database.
直接替换替代料： PIC18F4685-I/PT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18F4685-I/PT （相同外形与封装尺寸） ——差异在于 Package, ADC, Timers, Program Memory (Flash), I/O Pins.
快速对比工具——选择替代料号进行并排对比：
PIC18F4685T-I/PT
✅ 直接替换✓ 有现货
$6.89 / 个
查看数据手册 →PIC18F4580-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC18F4685-I/PT 最大额定值与电气特性
| Core Processor | PIC18F |
| Core Size / Data Bus Width | 8-bit |
| Maximum CPU Clock Speed | 40 MHz |
| Performance (MIPS) | 10 MIPS |
| Program Memory Type | Flash |
| Program Memory Size | 96 KB (48K x 16) |
| RAM Size | 3328 bytes |
| EEPROM Size | 1024 bytes |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Number of I/O Pins | 36 |
| ADC | 11 channels x 10-bit |
| Timers | 4 (Timer0/1/2/3) |
| Communication Interfaces | ECAN, I2C, SPI (MSSP), Enhanced USART |
| PWM / CCP Modules | 2 (CCP + ECCP) |
| Low-Power Modes | nanoWatt Technology (idle, sleep, deep sleep) |
| 工作温度范围 | -40 C to +85 C (Industrial) |
| 封装 | 44-pin TQFP (10x10 mm, 0.8 mm pitch) |
| 安装类型 | Surface Mount |
| Lead Count | 44 |
| Instruction Set | 75 instructions, RISC, hardware 8x8 multiplier |
| Programming / Debug | ICSP, ICD (in-circuit debug) |
| RoHS 状态 | Compliant |
| 无卤 | Compliant |
PIC18F4685-I/PT 引脚配置
| 引脚 1 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| 引脚 2 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| 引脚 3 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| 引脚 4 | RB3/CCP2 — Port B bit 3 / Capture/Compare/PWM 2 |
| 引脚 5 | RB4 — Port B bit 4 |
| 引脚 6 | RB5 — Port B bit 5 |
| 引脚 7 | RB6/PGC — Port B bit 6 / ICSP clock |
| 引脚 8 | RB7/PGD — Port B bit 7 / ICSP data |
| 引脚 9 | VSS — Ground reference |
| 引脚 10 | VDD — Positive supply (4.2V-5.5V) |
| 引脚 11 | RC0 — Port C bit 0 |
| 引脚 12 | RC1 — Port C bit 1 |
| 引脚 13 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 引脚 14 | RC3 — Port C bit 3 |
| 引脚 15 | RC4 — Port C bit 4 |
| 引脚 16 | RC5 — Port C bit 5 |
| 引脚 17 | RC6/TX — Port C bit 6 / EUSART TX |
| 引脚 18 | RC7/RX — Port C bit 7 / EUSART RX |
| 引脚 19 | VSS — Ground reference |
| 引脚 20 | VDD — Positive supply (4.2V-5.5V) |
| 引脚 21 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| 引脚 22 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| 引脚 23 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| 引脚 24 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| 引脚 25 | RA4 — Port A bit 4 |
| 引脚 26 | RA5/AN4 — Port A bit 5 / Analog input 4 |
| 引脚 27 | RE0/RD — Port E bit 0 / Parallel-port read |
| 引脚 28 | RE1/WR — Port E bit 1 / Parallel-port write |
| 引脚 29 | RE2/CS — Port E bit 2 / Parallel-port chip select |
| 引脚 30 | AVSS — Analog ground reference |
| 引脚 31 | AVDD — Analog positive supply |
| 引脚 32 | RA6/OSC2 — Port A bit 6 / Crystal output |
| 引脚 33 | RA7/OSC1 — Port A bit 7 / Crystal input |
| 引脚 34 | RC2 — Port C bit 2 (alt) |
| 引脚 35 | RC3 — Port C bit 3 (alt) |
| 引脚 36 | RC4 — Port C bit 4 (alt) |
| 引脚 37 | RD0 — Port D bit 0 |
| 引脚 38 | RD1 — Port D bit 1 |
| 引脚 39 | RD2 — Port D bit 2 |
| 引脚 40 | RD3 — Port D bit 3 |
| 引脚 41 | RD4 — Port D bit 4 |
| 引脚 42 | RD5 — Port D bit 5 |
| 引脚 43 | RD6 — Port D bit 6 |
| 引脚 44 | RD7 — Port D bit 7 |
典型应用
PIC18F4685-I/PT 适用于 6 应用s: Automotive ECAN Body and Chassis Networks, Industrial CAN-bus Sensor Nodes, HVAC Control Systems, Motor Control and BLDC Driver Interfaces, Building Automation Nodes, Embedded Sensor Hubs with Analog Digitization.
Automotive ECAN Body and Chassis Networks
The PIC18F4685's integrated ECAN (CAN 2.0B active) peripheral makes it ideal for automotive body and chassis ECAN nodes. With 96 KB Flash, it can hold a full CANopen or J1939 stack alongside application firmware; with 3328 bytes RAM, it has enough headroom for CAN message buffering without external memory. Placed between the 5 V vehicle rail and the CAN bus via an external MCP2551/MCP2561 transceiver, the part delivers 10 MIPS at 40 MHz for deterministic message handling. The 11-channel 10-bit ADC supports body-module analog sensors (temperature, humidity, position). Compared to higher-end MCUs, the PIC18F4685 strikes a strong price/performance balance for cost-sensitive automotive nodes.
推荐
Industrial CAN-bus Sensor Nodes
For industrial CAN-bus sensor nodes (e.g., CANopen DS-301 or DeviceNet), the PIC18F4685 offers the program memory and RAM needed for protocol stacks plus sensor DSP. Operating from 4.2 V to 5.5 V at -40 C to +85 C, it directly handles 24 V industrial rails via a simple DC-DC or LDO front end. Its 11-channel 10-bit ADC digitizes 4-20 mA loop or 0-10 V sensor signals at up to ~30 kSPS aggregate. The ECAN module's filters and masks reduce host CPU load on noisy industrial buses. Compared to higher-bit MCUs, the PIC18F4685 is well-suited when the sensor interface does not need 12-bit resolution.
推荐
HVAC Control Systems
The PIC18F4685 is well suited to HVAC controller designs: 36 I/O pins drive triac-fired blower motors, damper actuators, and relay outputs; two CCP/ECCP modules generate zero-cross PWM for fan-speed and valve control. With 96 KB Flash, it can host a full HVAC state machine, scheduling logic, and a Modbus or CANopen slave stack. The 10-bit ADC handles thermistor inputs from multiple air and water sensors, while the USART supports RS-485 BMS communication. nanoWatt Technology keeps standby draw low during off-season idle.
推荐
Motor Control and BLDC Driver Interfaces
For BLDC and stepper motor control interfaces, the PIC18F4685 provides the capture/compare channels, ADC channels, and PWM frequency required for trapezoidal and FOC commutation. Its 40 MHz / 10 MIPS throughput is sufficient for sensored BLDC up to moderate RPM; for sensorless FOC, migrate to a dsPIC33. The ECCP module with dead-band control drives a three-phase half-bridge via external gate drivers; the ECAN module reports torque/speed back to a vehicle or industrial master. The wide 4.2-5.5 V supply range supports 5 V industrial power rails with simple bulk capacitance.
推荐
Building Automation Nodes
Building automation nodes (BACnet MS/TP, Modbus RTU, or CANopen) map naturally to the PIC18F4685. Its 96 KB Flash holds BACnet/Modbus stacks; its enhanced USART handles RS-485 transceivers; its MSSP supports SPI sensors and I2C EEPROM expansion. With 36 I/O and 11 ADC channels, a single MCU can read multiple thermistors, switch contacts, and drive relay outputs for lighting or HVAC dampers. The 4.2 V to 5.5 V range simplifies 24 V bus power designs via a single buck converter.
推荐
Embedded Sensor Hubs with Analog Digitization
For embedded sensor hubs that aggregate multiple analog inputs (temperature, pressure, light, flow), the PIC18F4685 provides 11 channels of 10-bit ADC, 96 KB Flash for local calibration tables, and ECAN/USART for upstream communication. nanoWatt idle modes extend battery life in remote sensor installations. The hardware 8x8 multiplier accelerates sensor linearization and unit-conversion math. Compared to soft-CPU solutions, the integrated peripherals reduce BOM and PCB area.
推荐
推荐产品汇总
工程参考数据： PIC18F4685-I/PT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18F4685T-I/PT | PIC18F4580-I/PT |
|---|---|---|---|
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same |
| Program Memory (Flash) | 96 KB | 96 KB | 64 KB (-33%) |
| RAM | 3328 bytes | 3328 bytes | 3328 bytes |
| EEPROM | 1024 bytes | 1024 bytes | 1024 bytes |
| Maximum Clock Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| ECAN Module | Yes (CAN 2.0B active) | Yes (CAN 2.0B active) | Yes (CAN 2.0B active) |
| ADC | 11 x 10-bit | 11 x 10-bit | 11 x 10-bit |
| I/O Pins | 36 | 36 | 36 |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
关键差异点
- Largest Flash in PIC18F458x family （对比 PIC18F4580-I/PT)
- ECAN (CAN 2.0B active) integrated （对比 dsPIC33EV64GM106)
- Standard 44-pin TQFP-44 (10x10 mm) package （对比 PIC18F4685-I/SP)
设计说明
Decouple each VDD/AVDD pin with at least a 0.1 uF ceramic capacitor placed within 5 mm of the pin; add a bulk 10 uF tantalum or aluminum-polymer capacitor near the regulator. Tie VSS and AVSS to a single ground plane with a star connection at the MCU. For low-noise analog measurements, keep the AVDD rail separate from noisy digital rails; a ferrite bead plus LDO is recommended when the ADC must hit 10-bit ENOB.
The PIC18F4685's ECAN module is the protocol controller only - it drives TX/RX logic levels, not the bus differential signal. A separate external transceiver (MCP2551, MCP2561, TJA1050, or ISO1050) is mandatory; tying CAN lines directly to the MCU will damage the part and never achieve CAN compliance. Also remember to set the CANCTRL register and configure baud rate via BRGCON1/2/3 before enabling ECAN, otherwise the bus-off fault flag will not clear.
Keep the crystal (or external clock) traces short and symmetric; place guard ground around them to avoid coupling noise into the oscillator. Route the ICSP PGC/PGD lines to a 5-pin header with ground on both sides. Avoid routing CAN TX/RX traces parallel to high-current switching nodes for more than 25 mm; add a 100 ohm series termination if the bus stubs exceed the CAN spec.
合规信息
RoHS compliant and lead-free per Microchip product documentation. Halogen-free status: compliant per Verified Web Data. Industrial -40C to +85C temperature grade; not AEC-Q100 automotive-qualified - for automotive AEC-Q100 designs use PIC18F4685 with explicit automotive part suffix or upgrade to dsPIC33. Country of origin: Philippines or Thailand per Microchip Direct listing.