PIC18LF458-I/PT - 8-bit MCU, 32KB Flash, CAN, 44-TQFP | Microchip
MPN： PIC18LF458-I/PT ✓ 啟用中PIC18LF458-I/PT 概覽
What is a PIC18F microcontroller? The PIC18F family is Microchip's high-performance 8-bit microcontroller line based on an enhanced Harvard RISC architecture. An 8-bit MCU executes instructions on 8-bit data words and is widely used in embedded control applications where deterministic timing, low power consumption, and integrated peripherals (ADC, timers, communication buses) outweigh the need for higher throughput. PIC18F sits above the PIC16F family in Microchip's portfolio and below the 16-bit dsPIC/PIC24 families, serving cost-sensitive industrial and automotive applications.
Key features include an extended instruction set, hardware multiplier, 13-bit program counter capable of addressing 8MB of linear program memory, and self-programming Flash. The PIC18LF458 (LF variant) operates across an extended voltage range suited for low-voltage designs and includes a 10-bit ADC with up to 8 channels. The device supports in-circuit debugging via ICSP and in-circuit serial programming, eliminating the need for external programmers in production.
Typical applications include industrial automation (CAN-based sensor nodes, motor controllers), automotive body electronics (CAN bus nodes, lighting controllers), and embedded control systems (sensor aggregation, simple HMI). The integrated CAN 2.0B controller makes the PIC18LF458 particularly well-suited for distributed control networks where the MCU acts as a node on a CAN bus. Brown-out detection, watchdog timer, and low-power Sleep mode enhance reliability in safety-conscious designs.
When designing with this device, choose the LF variant for 2.0-3.6V operation versus the standard F variant's 4.0-5.5V range. Ensure the oscillator configuration matches the application's EMI tolerance, as the integrated CAN controller requires stable clocking for reliable network communication.
直接替換替代品，適用於 PIC18LF458-I/PT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF458-I/PT （相同外形與佔位） — 差異在於 ADC, Package, Timers, Program Memory (Flash), Operating Temperature.
PIC18F458-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF448-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F448-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF4580-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F4580-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF452-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF458-I/PT 最大額定值與電氣特性
| Core | PIC 8-bit RISC |
| Program Memory | 32 KB (16K x 16) Flash |
| RAM | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 8-channel, 10-bit |
| Communication Interfaces | CAN 2.0B, UART/USART, SPI, I2C |
| 封裝 | 44-TQFP (10x10 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (Industrial) |
| Instruction Set | 83 instructions (extended) |
| Timers | 4 (Timer0/1/2/3) |
| Brown-out Detect | Yes |
| Watchdog Timer | Yes (WDT) |
| ICSP Programming | Yes (In-Circuit Serial Programming) |
| RoHS 狀態 | Compliant |
PIC18LF458-I/PT 腳位配置
| 腳位 1 | OSC2/CLKO/RA6 — Oscillator output / GPIO |
| 腳位 2 | OSC1/CLKI/RA7 — Oscillator input / GPIO |
| 腳位 3 | MCLR/VPP — Master Clear reset / programming voltage |
| 腳位 4 | RA0/AN0 — GPIO / Analog input 0 |
| 腳位 5 | RA1/AN1 — GPIO / Analog input 1 |
| 腳位 6 | RA2/AN2/VREF- — GPIO / Analog input 2 / ADC VREF- |
| 腳位 7 | RA3/AN3/VREF+ — GPIO / Analog input 3 / ADC VREF+ |
| 腳位 8 | RA4/T0CKI — GPIO / Timer0 clock input |
| 腳位 9 | RA5/AN4/SS — GPIO / Analog input 4 / SPI slave select |
| 腳位 10 | VSS — Ground |
| 腳位 11 | VDD — Positive supply voltage |
| 腳位 12 | RB0/INT0 — GPIO / External interrupt 0 |
| 腳位 13 | RB1/INT1 — GPIO / External interrupt 1 |
| 腳位 14 | RB2/INT2 — GPIO / External interrupt 2 |
| 腳位 15 | RB3/CCP2 — GPIO / Capture/Compare/PWM 2 |
| 腳位 16 | RB4 — GPIO |
| 腳位 17 | RB5 — GPIO |
| 腳位 18 | RB6/PGC — GPIO / ICSP clock |
| 腳位 19 | RB7/PGD — GPIO / ICSP data |
| 腳位 20 | VSS — Ground |
| 腳位 21 | VDD — Positive supply voltage |
| 腳位 22 | RC0/T1OSO/T1CKI — GPIO / Timer1 output / clock input |
| 腳位 23 | RC1/T1OSI/CCP2 — GPIO / Timer1 oscillator input |
| 腳位 24 | RC2/CCP1 — GPIO / Capture/Compare/PWM 1 |
| 腳位 25 | RC3/SCK/SCL — GPIO / SPI clock / I2C clock |
| 腳位 26 | RC4/SDI/SDA — GPIO / SPI data in / I2C data |
| 腳位 27 | RC5/SDO — GPIO / SPI data out |
| 腳位 28 | RC6/TX/CK — GPIO / USART TX / clock |
| 腳位 29 | RC7/RX/DT — GPIO / USART RX / data |
| 腳位 30 | VSS — Ground |
| 腳位 31 | VDD — Positive supply voltage |
| 腳位 32 | RD0 — GPIO |
| 腳位 33 | RD1 — GPIO |
| 腳位 34 | RD2 — GPIO |
| 腳位 35 | RD3 — GPIO |
| 腳位 36 | RD4 — GPIO |
| 腳位 37 | RD5 — GPIO |
| 腳位 38 | RD6 — GPIO |
| 腳位 39 | RD7 — GPIO |
| 腳位 40 | VSS — Ground |
| 腳位 41 | VDD — Positive supply voltage |
| 腳位 42 | RE0/RD/AN5 — GPIO / read control / Analog input 5 |
| 腳位 43 | RE1/WR/AN6 — GPIO / write control / Analog input 6 |
| 腳位 44 | RE2/CS/AN7 — GPIO / chip select / Analog input 7 |
典型應用
PIC18LF458-I/PT 適用於 6 應用s: Industrial CAN Bus Node, Automotive Body Electronics, Sensor Aggregation Hub, Motor Control Subsystem, Embedded Data Logger, Building Automation Controller.
Industrial CAN Bus Node
The PIC18LF458-I/PT serves as a low-cost CAN 2.0B node for industrial automation networks such as CANopen and DeviceNet segments. With its integrated CAN controller, 40 MHz CPU (10 MIPS), and 32KB Flash, it handles protocol stack processing while leaving headroom for application logic. The 2.0-5.5V operating range suits 3.3V industrial sensor nodes, and the 8-channel 10-bit ADC aggregates analog inputs from local sensors (temperature, pressure, current). Place termination resistors (120 ohm) per CAN bus design rules and use isolated CAN transceivers (e.g., MCP2551 or ISO1050) to improve noise immunity in factory environments.
推薦
Automotive Body Electronics
The PIC18LF458-I/PT powers body electronics modules such as lighting controllers, seat position nodes, HVAC actuators, and mirror controllers on a CAN bus. Its 34 I/O pins drive multiple LEDs, relays, and H-bridges directly via PWM, while the CAN 2.0B controller provides reliable network communication. The -40C to +85C industrial temperature range handles under-dash environments, and Brown-out Detect plus Watchdog Timer ensure recovery from automotive power transients. For AEC-Q100 applications, upgrade to the automotive-qualified variant; for non-safety body modules, the LF458-I/PT delivers cost-effective performance.
推薦
Sensor Aggregation Hub
The PIC18LF458-I/PT aggregates data from multiple sensors via I2C and SPI buses, processes the data locally, and reports via CAN or UART. Its 8-channel 10-bit ADC handles analog sensor inputs (temperature, pressure, voltage, current) at up to 10 ksps aggregate throughput, while the 32KB Flash stores calibration tables and protocol handlers. The LF variant's 2.0V minimum operation supports battery-powered sensor hubs with cell-voltage compatibility. Use the LF458's Sleep mode (under 1 uA typical) for battery-life extension in wireless sensor nodes with periodic wake-up.
推薦
Motor Control Subsystem
The PIC18LF458-I/PT drives BLDC, stepper, or brushed DC motors via PWM outputs and closed-loop control algorithms. Its 4 timers and Capture/Compare/PWM (CCP) modules generate complementary PWM signals with dead-band control for half-bridge drivers. The 32KB Flash stores field-oriented control (FOC) lookup tables and PI controller state variables, while the ADC samples phase currents at 10 ksps. The CAN bus interface enables coordinated multi-axis motion control in industrial automation systems, with the MCU acting as a per-axis controller reporting status to a master PLC.
推薦
Embedded Data Logger
The PIC18LF458-I/PT implements a portable data logger for industrial monitoring or environmental sensing, storing sensor readings to external EEPROM or Flash via SPI while providing local display and CAN output. Its 32KB Flash holds the FAT-style file system or simple record scheduler, and 1.5KB SRAM buffers sectors before write. The 256-byte internal EEPROM stores configuration parameters that survive power cycles, eliminating external EEPROM cost. The LF variant's 2.0V operation supports Li-coin cell backup, and Sleep mode extends battery life between logging events.
推薦
Building Automation Controller
The PIC18LF458-I/PT serves as a sub-controller in building automation networks, handling HVAC damper actuators, lighting zones, and occupancy sensors via CAN or RS-485. Its 34 I/O pins control multiple low-voltage relay outputs and read digital inputs from wall switches and motion sensors. The 10-bit ADC monitors 4-20 mA current loops from industrial sensors (CO2, humidity), while the USART interfaces with Modbus RTU or BACnet MS/TP networks. Industrial temperature rating (-40C to +85C) supports unconditioned mechanical-room deployment.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF458-I/PT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18F458-I/PT | PIC18LF448-I/PT | PIC18F448-I/PT | PIC18LF4580-I/PT | PIC18LF452-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Operating Voltage | 2.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 3.6 V | 2.0 V to 5.5 V |
| Flash Memory | 32 KB | 32 KB | 16 KB | 16 KB | 32 KB | 32 KB |
| RAM | 1.5 KB | 1.5 KB | 768 bytes | 768 bytes | 2 KB | 1.5 KB |
| CAN Controller | Yes (CAN 2.0B) | Yes (CAN 2.0B) | Yes (CAN 2.0B) | Yes (CAN 2.0B) | Yes (CAN 2.0B) | No (CAN-less variant) |
| ADC Channels | 8 channels x 10-bit | 8 channels x 10-bit | 8 channels x 10-bit | 8 channels x 10-bit | 12 channels x 10-bit | 8 channels x 10-bit |
| I/O Pins | 34 | 34 | 34 | 34 | 36 | 34 |
| AEC-Q100 Qualified | No (Industrial -40C to +85C) | Yes (automotive variant) | No | Yes (automotive variant) | No | No |
主要差異化特點
- Low-voltage operation down to 2.0V (對比PIC18F458-I/PT)
- Full 32KB Flash for code-rich applications (對比PIC18LF448-I/PT)
- CAN 2.0B integrated controller (對比PIC18LF452-I/PT)
設計說明
The PIC18LF458-I/PT operates from 2.0V to 5.5V. Place a 100 nF decoupling capacitor as close as possible to each VDD pin (4 VDD pins on the 44-TQFP) and a bulk 10 uF tantalum or ceramic capacitor at the power entry point. Add a ferrite bead in series with VDD if switching noise from external circuitry (e.g., a CAN bus) couples into the MCU supply. For battery-powered designs using the LF variant's 2.0V minimum, ensure the brown-out voltage is configured above the battery cutoff (typically 2.2V for single-cell Li coin cells).
Route the high-speed CAN TX/RX traces as a differential pair with 100-ohm controlled impedance on the PCB, keeping trace length under 50 mm to minimize reflections. Place the MCP2551 (or ISO1050 isolated) CAN transceiver within 25 mm of the MCU's CANTX/CANRX pins to keep stubs short. Use a 4-layer PCB with a dedicated ground plane for the analog section to isolate the ADC reference (VREF+/VREF-) from digital switching noise.
Do not confuse the LF (low-voltage 2.0-5.5V) variant with the F (standard 4.0-5.5V) variant - if your design uses a 3.3V regulator, only the LF variant will operate correctly. Always include proper termination (120 ohm) at both ends of the CAN bus, never in the middle. For ICSP programming, leave the RB6/PGC and RB7/PGD pins accessible on the PCB (test points or header) since in-circuit programming via these pins is essential for field firmware updates.
合規資訊
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F458 automotive variant for AEC-Q100 applications.