PIC18F4685-I/PT - 8-bit 40MHz 96KB Flash MCU w/ ECAN | Microchip
N.º da peça: PIC18F4685-I/PT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 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 Visão geral
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.
Alternativas drop-in para PIC18F4685-I/PT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC18F4685-I/PT (mesmo formato e footprint) — diferindo em Package, ADC, Timers, Program Memory (Flash), I/O Pins.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC18F4685T-I/PT
✅ Drop-In✓ Em estoque
$6.89 / unidade
Ver ficha técnica →PIC18F4580-I/PT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC18F4685-I/PT Classificações máximas e características elétricas
| 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) |
| Faixa de temperatura de operação | -40 C to +85 C (Industrial) |
| Encapsulamento | 44-pin TQFP (10x10 mm, 0.8 mm pitch) |
| Tipo de montagem | Surface Mount |
| Lead Count | 44 |
| Instruction Set | 75 instructions, RISC, hardware 8x8 multiplier |
| Programming / Debug | ICSP, ICD (in-circuit debug) |
| Status RoHS | Compliant |
| Livre de halogênio | Compliant |
Configuração de pinos do PIC18F4685-I/PT
| Pino 1 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| Pino 2 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| Pino 3 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| Pino 4 | RB3/CCP2 — Port B bit 3 / Capture/Compare/PWM 2 |
| Pino 5 | RB4 — Port B bit 4 |
| Pino 6 | RB5 — Port B bit 5 |
| Pino 7 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pino 8 | RB7/PGD — Port B bit 7 / ICSP data |
| Pino 9 | VSS — Ground reference |
| Pino 10 | VDD — Positive supply (4.2V-5.5V) |
| Pino 11 | RC0 — Port C bit 0 |
| Pino 12 | RC1 — Port C bit 1 |
| Pino 13 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Pino 14 | RC3 — Port C bit 3 |
| Pino 15 | RC4 — Port C bit 4 |
| Pino 16 | RC5 — Port C bit 5 |
| Pino 17 | RC6/TX — Port C bit 6 / EUSART TX |
| Pino 18 | RC7/RX — Port C bit 7 / EUSART RX |
| Pino 19 | VSS — Ground reference |
| Pino 20 | VDD — Positive supply (4.2V-5.5V) |
| Pino 21 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pino 22 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pino 23 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pino 24 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Pino 25 | RA4 — Port A bit 4 |
| Pino 26 | RA5/AN4 — Port A bit 5 / Analog input 4 |
| Pino 27 | RE0/RD — Port E bit 0 / Parallel-port read |
| Pino 28 | RE1/WR — Port E bit 1 / Parallel-port write |
| Pino 29 | RE2/CS — Port E bit 2 / Parallel-port chip select |
| Pino 30 | AVSS — Analog ground reference |
| Pino 31 | AVDD — Analog positive supply |
| Pino 32 | RA6/OSC2 — Port A bit 6 / Crystal output |
| Pino 33 | RA7/OSC1 — Port A bit 7 / Crystal input |
| Pino 34 | RC2 — Port C bit 2 (alt) |
| Pino 35 | RC3 — Port C bit 3 (alt) |
| Pino 36 | RC4 — Port C bit 4 (alt) |
| Pino 37 | RD0 — Port D bit 0 |
| Pino 38 | RD1 — Port D bit 1 |
| Pino 39 | RD2 — Port D bit 2 |
| Pino 40 | RD3 — Port D bit 3 |
| Pino 41 | RD4 — Port D bit 4 |
| Pino 42 | RD5 — Port D bit 5 |
| Pino 43 | RD6 — Port D bit 6 |
| Pino 44 | RD7 — Port D bit 7 |
Aplicações típicas
PIC18F4685-I/PT é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC18F4685-I/PT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Largest Flash in PIC18F458x family (vs PIC18F4580-I/PT)
- ECAN (CAN 2.0B active) integrated (vs dsPIC33EV64GM106)
- Standard 44-pin TQFP-44 (10x10 mm) package (vs PIC18F4685-I/SP)
Notas de projeto
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.
Informações de conformidade
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.