PIC18LF24K42-I/SP
PIC18LF24K42-I/SP - 8-Bit 64MHz XLP MCU, 16KB Flash, 28-SPDIP | Microchip
The Microchip Technology PIC18LF24K42-I/SP is an 8-bit RISC microcontroller from the PIC18 K42 family, featuring a 64 MHz maximum CPU clock, 16 KB of Flash program memory, 1 KB of data RAM, and 256 bytes of EEPROM, housed in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. The "LF" prefix and "I" temperature grade denote an extended-voltage (1.8 V to 3.6 V) variant rated for the industrial -40 °C to +85 °C range, while the "SP" suffix specifies the SPDIP-28 form factor.
What is an 8-bit microcontroller? An 8-bit MCU is a small, self-contained processor that executes instructions on 8-bit-wide data words. It sits in the broader hierarchy of microcontrollers -> microprocessors -> programmable logic devices -> semiconductors. PIC18 devices are among the most widely deployed 8-bit architectures and target low-power, deterministic embedded control in industrial and consumer products. Peripherals typically include timers, ADC, comparators, UART, I2C, SPI, and PWM modules that let the MCU drive motors, read sensors, and communicate with other ICs.
Key differentiating features include an integrated 12-bit ADC with 5-bit DAC capability on selected channels, 25 general-purpose I/O pins, four 16-bit timers with hardware limit timers, and a 10-bit PWM module with up to four outputs. The K42 family also introduces Core Independent Peripherals (CIPs) such as Configurable Logic Cells (CLC), Complementary Waveform Generator (CWG), Numerically Controlled Oscillator (NCO), and zero-cross detection that can operate without CPU intervention. Active power consumption stays low and a range of sleep modes (Idle, Doze, Sleep, Deep Sleep) enables eXtreme Low Power (XLP) operation for battery-backed applications.
Architecturally, the PIC18LF24K42 uses a Harvard RISC core with separate program and data buses, an 8-deep hardware stack, hardware multiply, and a 32-level priority interrupt controller. The 64 MHz FOSC supports 16 MIPS throughput, which is roughly 4x faster than legacy 16 MHz PIC16 devices and sufficient for state-machine, sensing, and simple closed-loop control tasks. The integrated Direct Memory Access (DMA) controller can move data between peripherals and RAM without CPU overhead, freeing the core for application logic.
Typical application areas include low-power IoT sensor nodes, HVAC controls, battery chargers, industrial sensor interfaces, LED lighting controls, remote-control units, smart metering, and home appliances. The wide 1.8 V to 3.6 V supply range makes the part suitable for single-cell Li coin-cell designs as well as 3.3 V industrial rails, and the 12-bit ADC enables direct interfacing with bridge sensors, thermistors, and potentiometers without external analog front-ends.
When designing with this MCU, plan the clock-tree carefully and ensure both VDD/VSS pairs are connected to avoid programming failures during ICSP, and respect the maximum FOSC/Vdd curve when choosing PLL modes. Beginners should also note that the Configuration Words control oscillator, watchdog, and code-protect behavior, and that LVP must be enabled in configuration to allow in-circuit low-voltage programming.
This page consolidates verified distributor pricing, parametric specs, drop-in alternatives and application guidance designed to reduce the time engineers spend cross-referencing multiple datasheet portals.
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