PIC18LF258-I/SO
PIC18LF258-I/SO - 8-Bit 40MHz 32KB Flash MCU 28-SOIC | Microchip
The Microchip Technology PIC18LF258-I/SO is an 8-bit PIC18F-family microcontroller featuring a 40 MHz CPU clock, 32 KB (16K x 16) of on-chip Flash program memory, and a 28-pin SOIC package. It is part of the PIC18LF sub-family (the "LF" suffix indicates a low-voltage variant of the LF/F PIC18 line), optimized for operation across 4.2 V to 5.5 V supply rails with industrial-temperature robustness. The device integrates CAN 2.0B controller peripherals alongside standard PIC18 peripherals, making it a frequent choice for embedded networking.
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.
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