PIC18F458-E/PT - 8-bit MCU 32KB Flash CAN TQFP-44 | PIC18F
MPN: PIC18F458-E/PT ✓ Hoạt độngPIC18F458-E/PT Tóm tắt
What is a PIC18F microcontroller? The PIC18F family is Microchip's enhanced 8-bit RISC architecture built on a 16-bit instruction word, positioned hierarchically as: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. Compared to base-line PIC16 parts, PIC18 devices add a hardware multiplier, extended instruction set, larger linear addressing (up to 2 MB), priority interrupts, and peripheral-rich variants like the F458 with integrated CAN.
Key features include a 10-bit ADC with up to 8 channels, two 8-bit and three 16-bit timers, two capture/compare/PWM (CCP) modules plus one enhanced CCP, an addressable USART, MSSP (I2C/SPI), and a CAN 2.0B controller compliant with CAN 2.0A/B active or passive. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debug (ICD) via two pins. Self-programmability under firmware control is supported through a dedicated boot block.
Typical applications include automotive body and chassis ECUs, industrial CAN-bus nodes, sensor aggregation gateways, HVAC controls, and small automation PLCs. The on-chip CAN module eliminates an external controller, reducing BOM and improving EMI immunity for in-vehicle networks.
When designing, ensure the extended temperature grade (-40C to +125C) is suitable for your thermal envelope; for lower-temperature commercial designs the PIC18F458-I variant is preferred. Decouple VDD/VSS with 100 nF + bulk capacitance near the pins, and follow Microchip's TQFP-44 thermal layout guidance when operating at sustained 40 MHz.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement (and do not replace) the manufacturer datasheet referenced below.
Bộ thay thế dễ dàng lắp đặt cho PIC18F458-E/PT — 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 PIC18F458-E/PT (cùng hình factor và footprint) — khác nhau ở Package, ADC, I/O Pins, Operating Temperature, Mounting Type.
PIC18F458-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F448-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4580-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4580-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4585-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4480-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F458-E/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC18 RISC, 16-bit instruction word |
| Program Flash | 32 KB (16K x 16) |
| RAM | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| Tần số xung maksimum | 40 MHz (10 MIPS) |
| Operating Voltage | 4.5 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | 2 x 8-bit + 3 x 16-bit |
| Capture/Compare/PWM | 2 CCP + 1 ECCP |
| Communication | CAN 2.0B, UART/USART, I2C, SPI |
| CAN Module | 1 x CAN 2.0B (active/passive) |
| Hộp | 44-pin TQFP (PT), 10x10 mm |
| Nhiệt độ hoạt động | -40 C to +125 C (Extended, 'E') |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC18F458-E/PT
| Chân 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / parallel port read / analog input 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / parallel port write / analog input 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / parallel port chip select / analog input 7 |
| Chân 11 | VDD — Digital supply voltage (+5V) |
| Chân 12 | VSS — Digital ground |
| Chân 13 | OSC1/CLKI/RA7 — Oscillator input / external clock / PORTA bit 7 |
| Chân 14 | OSC2/CLKO/RA6 — Oscillator output / clock output / PORTA bit 6 |
| Chân 15 | RC0/T1OSO/T12CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Chân 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Chân 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Chân 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Chân 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Chân 31 | VSS — Digital ground |
| Chân 32 | VDD — Digital supply voltage (+5V) |
| Chân 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 36 | RB3/CCP2A — PORTB bit 3 / CCP2 alternate |
| Chân 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Chân 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | CANTX — CAN transmit output (alternate mapping) |
| Chân 44 | CANRX — CAN receive input (alternate mapping) |
Ứng dụng tiêu biểu
PIC18F458-E/PT phù hợp cho 7 Áp dụngs: Automotive Body and Chassis ECU, Industrial CAN-Node Aggregation, HVAC and Building Automation Controller, Sensor Gateway / Edge Concentrator, Small Automation PLC / Relay Logic Replacement, Medical Monitoring Peripheral, Aerospace Avionics Bus Node.
Automotive Body and Chassis ECU
The PIC18F458-E/PT's integrated CAN 2.0B controller and -40 C to +125 C extended temperature grade make it a fit for body and chassis ECUs. Why: deterministic CAN message handling without an external controller reduces BOM and EMI surface. How: firmware runs at 10 MIPS from a 40 MHz oscillator, with CAN interrupt servicing shared alongside ADC sampling of sensor inputs (temperature, position). Compared with a discrete MCU+CAN solution, the PIC18F458-E/PT consolidates two ICs into one and lowers quiescent draw in sleep modes via nanoWatt-style idle instructions.
Được đề xuất
Industrial CAN-Node Aggregation
Industrial CANopen or DeviceNet nodes aggregate sensor data and forward it to a PLC. Why: the PIC18F458-E/PT's 32 KB Flash accommodates a CANopen stack plus application code, while 1.5 KB RAM buffers incoming PDOs. How: place the MCU on a 5 V rail with the MCP2551 CAN transceiver on the bus side; the integrated hardware CAN module handles bit-stuffing and CRC without CPU intervention, freeing the core for sensor I/O. Per the manufacturer datasheet, the MSSP also supports SPI sensors in parallel.
Được đề xuất
HVAC and Building Automation Controller
The PIC18F458-E/PT suits HVAC controllers driving fans, valves, and dampers via CAN or UART links to a building management system. Why: 34 I/O pins drive multiple triac outputs, while two CCP modules generate PWM for variable-speed fans; 10-bit ADC reads temperature and pressure sensors. How: a typical design uses PORTA for analog inputs, PORTB for keypad, and PORTC for the CAN bus; firmware implements Modbus/CANopen bridging. The 40 MHz core ensures the control loop stays well under 10 ms even with networking overhead.
Được đề xuất
Sensor Gateway / Edge Concentrator
Use the PIC18F458-E/PT as an edge gateway that aggregates multiple SPI/I2C sensors onto a CAN backbone. Why: the MSSP supports both I2C and SPI simultaneously, while hardware CAN transmits upstream; 1.5 KB RAM buffers sensor bursts. How: firmware polls sensor slaves at 100 Hz over I2C, packages readings into CAN IDs, and broadcasts every 10 ms. The extended temperature grade allows outdoor cabinet placement; the 256-byte EEPROM stores calibration constants without external memory.
Được đề xuất
Small Automation PLC / Relay Logic Replacement
For small automation PLCs replacing legacy relay logic, the PIC18F458-E/PT's 34 digital I/O and 16-bit timers handle multiple discrete signals and PWM outputs. Why: deterministic interrupt latency from the priority interrupt controller ensures scan-time stability; CAN bus links to a master controller or HMI. How: ladder-style firmware scans inputs, evaluates logic, and updates outputs in <5 ms scan cycles; the CAN module provides deterministic peer-to-peer messaging across the cell.
Được đề xuất
Medical Monitoring Peripheral
Battery or line-powered medical peripherals (e.g., patient monitors, infusion pump sub-systems) use the PIC18F458-E/PT to collect sensor data and forward it over CAN to a host display. Why: the deterministic CAN bus is well-suited to medical device networks, and the extended temperature range supports hospital and home environments. How: a 10-bit ADC samples physiological signals, while the CAN module broadcasts real-time updates; firmware in 32 KB Flash implements safety checks and watchdog logic. The wide 4.5-5.5 V supply tolerance accommodates linear regulator outputs directly.
Được đề xuất
Aerospace Avionics Bus Node
Avionics subsystems use the PIC18F458-E/PT as a low-cost CAN bus node for non-flight-critical subsystems (cabin pressure, lighting, galley controls). Why: hardware CAN 2.0B with active or passive modes supports standard aerospace CAN databuses, while the -40 C to +125 C grade covers avionics bay temperatures. How: firmware listens for specific CAN IDs and toggles actuator outputs; CCP modules drive PWM for dimming and valve control. Compliance to DO-160 environmental conditions is verified at the system level, not by the MCU alone.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F458-E/PT — 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 | PIC18F458-I/PT | PIC18F448-E/PT | PIC18F4580-I/PT | PIC18F4585-I/PT | PIC18F4480-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (PT) 10x10 mm | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Flash | 32 KB | 32 KB | 16 KB | 32 KB | 48 KB | 16 KB |
| RAM | 1.5 KB | 1.5 KB | 768 B | 1.5 KB | 3.3 KB | 768 B |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| CAN 2.0B Module | Yes | Yes | Yes | Yes | Yes | Yes |
| Temperature Grade | Extended -40 to +125 C | Industrial -40 to +85 C | Extended -40 to +125 C | Industrial -40 to +85 C | Industrial -40 to +85 C | Industrial -40 to +85 C |
| ADC | 10-bit, 8 ch | 10-bit, 8 ch | 10-bit, 8 ch | 10-bit, 11 ch | 10/12-bit, 11 ch | 10-bit, 11 ch |
| nanoWatt XLP Low Power | No | No | No | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Integrated CAN 2.0B controller on-chip (vsPIC18F452-I/PT)
- Higher memory capacity within the same TQFP-44 footprint (vsPIC18F448-E/PT)
- Pin-compatible upgrade path to nanoWatt XLP devices (vsPIC18F4580-E/PT)
- Extended temperature grade for harsh environments (vsPIC18F458-I/PT)
Ghi chú thiết kế
The PIC18F458-E/PT operates from a 4.5-5.5 V single supply. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pins 11/12 and 31/32 on TQFP-44), plus a bulk 10 uF tantalum or ceramic on the rail. Estimated: with all peripherals active and 40 MHz oscillator, IDD can reach ~25 mA; use a regulator rated for at least 1.5x headroom to prevent brown-out during CAN transmit bursts. A 10 kHz decoupling cap on AVdd/AVss further reduces ADC noise.
Pin 1 (MCLR/VPP) requires proper handling to avoid unintended resets. Tie MCLR to VDD through a 10 kohm pull-up resistor and route the ICSP/ICD connector through isolation resistors (typically 4.7 kohm) per Microchip's debugger documentation. Do not leave MCLR floating; floating MCLR is the most common cause of erratic behavior on PIC18F designs. If using the internal weak pull-up, ensure no in-circuit programmer will be attached during field operation.
The TQFP-44 package has 0.8 mm pitch and exposed thermal pad. Maintain 0.4 mm trace/space rules and a continuous ground plane on the layer immediately beneath the device. For high-noise CAN environments, place the MCP2551 (or equivalent) CAN transceiver within 25 mm of the CANTX/CANRX pins, route the bus differentially with 120 ohm characteristic impedance, and add TVS protection (e.g., SMBJ24CA) at the bus connector.
Estimated: at 40 MHz and full I/O switching, internal dissipation stays below 200 mW and self-heating is negligible on a properly laid-out PCB. In an enclosed automotive junction box at +85 C ambient with no airflow, however, the junction-to-ambient thermal resistance of approximately 50 C/W yields a Tj rise of about 10 C - well within the 125 C limit. Add thermal vias beneath the exposed pad if the device is operated in a sealed enclosure.
The PIC18F458-E/PT's integrated CAN module requires a clean oscillator reference; jitter above +/- 2% on the CAN clock source can cause bit-timing violations and bus errors. Use a high-stability crystal or resonator with appropriate load capacitors (per crystal vendor specs, typically 15-33 pF). For low-EMI designs, enable the CAN module's silent/loopback modes during development to validate firmware without driving the physical bus.
Thông tin tuân thủ
RoHS/REACH status not explicitly stated in the verified data; lead-free per Microchip modern product line. AEC-Q100 qualification available for 'E' (extended) automotive variants per manufacturer datasheet.