PIC18LF258-I/SO - 8-Bit 40MHz 32KB Flash MCU 28-SOIC | Microchip
MPN: PIC18LF258-I/SO ✓ فعالPIC18LF258-I/SO نمای کلی
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path; it executes instructions from on-chip Flash memory, communicates with peripherals through programmable I/O pins, and integrates core peripherals such as timers, ADC, UART, and CAN controllers on the same silicon die. PIC18F devices sit above baseline PIC16 parts in the Microchip taxonomy (PIC16 -> PIC18 -> dsPIC33/PIC24 -> PIC32MX), offering richer instruction set (16-bit opcodes, 8-bit data), C-friendly architecture, and significantly more peripherals. The "LF" designation denotes low-voltage Flash process, enabling operation down to approximately 2.0 V in some LF variants, while the standard "F" part runs up to 5.5 V; the I/SO designator specifies industrial temperature grade (-40 C to +85 C) in SOIC package.
Key features of the PIC18LF258 include 32 KB Flash, 1536 bytes of RAM, 256 bytes of EEPROM, 23 digital I/O pins, an integrated CAN 2.0B controller, a 10-bit ADC, two analog comparators, two USART modules, MSSP (SPI/I2C), and a 5-channel 8-bit PWM block. The part supports both ICSP (In-Circuit Serial Programming) and ICD (In-Circuit Debug) interfaces, allowing firmware updates and live debug without removing the device from the board. With 40 MHz oscillator and a 4-instruction pipeline, the device delivers up to 10 MIPS throughput, sufficient for modest real-time control loops.
The architecture is built on a 16-bit enhanced Harvard structure, separating program and data bus widths. This dual-bus design lets the CPU fetch instructions from Flash while simultaneously reading/writing SRAM over the data bus, eliminating von Neumann bottlenecks. The internal RC oscillator and PLL support flexible clocking options; the CAN 2.0B engine has 3 transmit and 2 receive buffers plus acceptance filters, suitable for high-reliability industrial and automotive networking.
Typical applications include industrial CAN-bus nodes (sensor aggregation, motor control feedback), building automation (HVAC controllers, lighting networks), automotive body and accessory modules, low-cost serial-to-CAN bridges, and embedded sensing platforms requiring 8-bit determinism with low power consumption. The 28-SOIC package provides hand-solderable, breadboard-friendly access for prototyping while remaining production-suitable for automated assembly lines.
When designing with the PIC18LF258-I/SO, ensure decoupling: place a 100 nF ceramic capacitor directly between VDD and VSS pins, plus a bulk 10 uF electrolytic on the main supply rail. Always configure unused I/O as outputs and tie to ground through 10kΩ resistors. For CAN bus applications, terminate the bus with 120Ω resistors at each physical end and use a CAN transceiver such as the MCP2551 or TJA1050 between the MCU and the bus.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
جایگزین‌های drop-in برای PIC18LF258-I/SO — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC18LF258-I/SO (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Timers, I/O Pins, Core, RAM.
PIC18LF258T-I/SO
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF248-I/SO
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF252-I/SO
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2580-I/SO
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F258-I/SO
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18LF2550-I/SO
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF2520-I/SO
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF258-I/SO حداکثر مقادیر مجاز و مشخصات الکتریکی
| Product Family | PIC18F |
| Core | 8-bit PIC |
| Maximum CPU Clock | 40 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data Memory (RAM) | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| I/O Pins | 23 |
| ADC | 10-bit, 5 channels |
| CAN | CAN 2.0B controller, integrated |
| Supply Voltage Range | 4.2 V to 5.5 V |
| دمای کاری | -40 C to +85 C (Industrial) |
| بسته‌بندی | 28-pin SOIC (SO) |
| نوع نصب | Surface Mount |
| Throughput | 10 MIPS |
| Program Memory Type | Flash (self-programmable via ICSP) |
| Number of Timers | 4 (Timer0/1/2/3) |
| PWM Channels | 5 (8-bit CCP) |
| Serial Interfaces | 2x USART, 1x MSSP (SPI/I2C) |
| سطح MSL | 1 |
| وضعیت RoHS | Compliant |
پیکربندی پین PIC18LF258-I/SO
| پین 1 | MCLR/VPP — Master Clear (Reset) input / programming voltage |
| پین 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| پین 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / negative voltage reference |
| پین 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / positive voltage reference |
| پین 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پین 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| پین 8 | VSS — Ground reference |
| پین 9 | OSC1/CLKI — Oscillator crystal input / external clock input |
| پین 10 | OSC2/CLKO — Oscillator crystal output / clock output |
| پین 11 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| پین 12 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| پین 13 | RB2/P1B — PORTB bit 2 / PWM output 1B |
| پین 14 | RB3/P1A — PORTB bit 3 / PWM output 1A |
| پین 15 | RB4 — PORTB bit 4 |
| پین 16 | RB5/PGM — PORTB bit 5 / ICSP programming clock |
| پین 17 | RB6/PGC — PORTB bit 6 / ICSP serial clock |
| پین 18 | RB7/PGD — PORTB bit 7 / ICSP serial data |
| پین 19 | VSS — Ground reference |
| پین 20 | VDD — Positive supply voltage |
| پین 21 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| پین 22 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| پین 23 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| پین 24 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 25 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 26 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 27 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| پین 28 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
کاربردهای معمول
PIC18LF258-I/SO مناسب است برای 6 کاربردs: Industrial CAN-Bus Communication Nodes, Building Automation and HVAC Controllers, Automotive Body and Accessory Modules, Serial-to-CAN Gateway Bridges, Embedded Sensing and Data Acquisition Platforms, Low-Cost Motor Control with CAN Feedback.
Industrial CAN-Bus Communication Nodes
The PIC18LF258-I/SO's integrated CAN 2.0B controller with 3 transmit buffers, 2 receive buffers, and 6 acceptance masks makes it ideal for industrial CAN-bus nodes that aggregate sensor data, broadcast control commands, and synchronize with PLC networks. The 40 MHz CPU clock and 10 MIPS throughput enable deterministic response times suitable for 125 kbps to 1 Mbps CAN networks. Place a CAN transceiver such as the MCP2551 or TJA1050 between the MCU CANTX/CANRX pins and the physical bus, terminate the bus with 120Ω resistors at each end, and leverage the PIC18LF258's 32 KB Flash to implement the full CANopen or DeviceNet stack. The 4.2V-5.5V supply matches the typical 5V industrial rail.
پیشنهادی
Building Automation and HVAC Controllers
In building automation systems (BAS) such as HVAC controllers and lighting networks, the PIC18LF258-I/SO provides the 8-bit determinism required for reliable RS-485 multi-drop communication and on-board temperature sensor polling. The 23 digital I/O pins support triac outputs for AC load switching, plus 10-bit 5-channel ADC for thermistor inputs. The 32 KB Flash comfortably stores BACnet MS-TP or Modbus RTU firmware, while 1.5 KB SRAM handles typical transaction buffers. Operate the MCU at 40 MHz CPU clock to poll up to 32 sensor nodes per second with deterministic latency. Industrial -40 C to +85 C temperature range accommodates plant-room environments.
پیشنهادی
Automotive Body and Accessory Modules
The PIC18LF258-I/SO fits automotive body electronics such as seat controllers, mirror adjustment modules, and lighting controllers where CAN bus communication and small form factor are required. The 28-SOIC package enables compact PCB layout, while the integrated CAN 2.0B controller handles body network communication at 125 kbps to 500 kbps. The 10-bit ADC reads position sensors and current shunts for motor feedback loops. Note: for AEC-Q100 qualified automotive designs, use PIC18F258-I/SO automotive variant or specifically Q-graded PIC18LF parts; the standard PIC18LF258-I/SO is industrial-grade only.
پیشنهادی
Serial-to-CAN Gateway Bridges
The PIC18LF258-I/SO is well-suited for serial-to-CAN gateway products that translate UART or USB commands into CAN bus messages for retrofitting older equipment onto CAN networks. With both USART modules (2x) and integrated CAN controller, the device handles bidirectional protocol conversion in firmware without requiring external bridges. The 32 KB Flash stores command parsing tables, the 1.5 KB RAM handles CAN RX/TX buffering, and the 40 MHz CPU executes protocol translation in real time at <1 ms latency. Industrial temperature range (-40 C to +85 C) supports factory-floor gateway placement.
پیشنهادی
Embedded Sensing and Data Acquisition Platforms
Embedded sensing platforms such as environmental monitors, process-control data loggers, and laboratory instruments benefit from the PIC18LF258-I/SO's 10-bit ADC with 5 channels, ample Flash (32 KB) for buffer management, and dual USART for simultaneous sensor data uplink and command input. The 23 I/O pins accommodate multiplexed sensor arrays, status LEDs, and user interface buttons. The 256-byte EEPROM stores calibration constants across power cycles. Industrial temperature range supports outdoor and factory-floor deployment.
پیشنهادی
Low-Cost Motor Control with CAN Feedback
Small DC and stepper motor systems with CAN bus feedback use the PIC18LF258-I/SO for closed-loop motor control. The 5-channel 8-bit PWM drives H-bridge motor drivers via optocouplers or gate drivers, the 10-bit ADC reads back current sense and tachometer signals, and the CAN controller broadcasts motor status to a master controller at 125 kbps to 1 Mbps. The 40 MHz CPU clock provides sufficient cycles to run a 1 kHz PID loop while handling CAN interrupt overhead. Industrial grade supports harsh industrial environments with vibration and temperature swings.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18LF258-I/SO — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18LF258T-I/SO | PIC18LF248-I/SO | PIC18LF252-I/SO | PIC18LF2580-I/SO | PIC18F258-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SOIC | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same |
| CPU Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Memory | 32 KB | 32 KB | 16 KB (-50%) | 32 KB | 32 KB | 32 KB |
| RAM | 1.5 KB | 1.5 KB | 768 B (-49%) | 1.5 KB | 2 KB (+33%) | 1.5 KB |
| I/O Pins | 23 | 23 | 23 | 23 | 25 | 23 |
| CAN Controller | CAN 2.0B | CAN 2.0B | CAN 2.0B | None (no CAN) | CAN 2.0B | CAN 2.0B |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V (wider) |
| 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 |
تفاوت‌های کلیدی
- Integrated CAN 2.0B controller with 3 TX / 2 RX buffers and 6 acceptance filters (در مقابلPIC18LF252-I/SO)
- Full 32 KB Flash memory vs reduced 16 KB on smaller-family variants (در مقابلPIC18LF248-I/SO)
- Wider voltage range from 2.0 V to 5.5 V on the F variant (در مقابلPIC18F258-I/SO)
- 23 dedicated I/O pins vs 25 on enhanced variants (در مقابلPIC18LF2580-I/SO)
یادداشت‌های طراحی
Place a 100 nF ceramic decoupling capacitor as close as physically possible to each VDD pin (pin 20 in 28-SOIC). Add a bulk 10 uF electrolytic or tantalum capacitor on the main 5 V supply rail near the MCU. The PIC18LF258 draws approximately 15-25 mA at full 40 MHz CPU clock, so verify your regulator can supply at least 50 mA to allow for ADC, GPIO, and CAN module current. For battery or low-noise applications, add a ferrite bead between the digital 5 V supply and the analog AVdd rail if your design splits them.
Always configure unused I/O pins as outputs and tie them to ground through 10 kΩ resistors. Floating inputs can cause shoot-through current in the CMOS input structures, leading to elevated IDD readings and unpredictable operation. When programming via ICSP, ensure the MCLR/VPP pin (pin 1) has a pull-up resistor (typically 10 kΩ to VDD) and that the PGC/PGD pins are not loaded with capacitance exceeding the ICSP specification, or programming will fail.
Place the oscillator crystal (or resonator) within 1 cm of the OSC1 and OSC2 pins (pins 9 and 10). Keep the crystal traces short and surrounded by ground plane on the PCB to minimize EMI. For CAN bus implementations, route the CANTX and CANRX traces as a differential pair, keep them at least 3 mm away from any switching traces, and place the MCP2551 transceiver within 2 cm of the MCU. The CAN bus physical layer requires 120Ω termination resistors at each end of the bus; place these on the cable, not on the MCU board, to allow bus reconfiguration.
اطلاعات انطباق
RoHS compliant per Microchip product page. Standard industrial-grade part (I-suffix, -40 C to +85 C). For AEC-Q100 qualified automotive applications, contact Microchip for specific Q-graded PIC18LF variants; the standard PIC18LF258-I/SO is industrial-grade only.
