PIC18F25K42-E/ML
PIC18F25K42-E/ML - 8-Bit 64MHz 32KB Flash MCU | Microchip
The Microchip Technology PIC18F25K42-E/ML is a 28-pin 8-bit PIC18 microcontroller built on the eXtreme Low-Power (XLP) platform and Functional Safety (FuSa) architecture, operating at up to 64 MHz with 32 KB of Flash program memory, 2 KB of SRAM, and 256 bytes of EEPROM, housed in a 6 x 6 mm 28-QFN package (ML). The -E suffix indicates the -40C to +125C extended-temperature grade, qualified for harsh industrial and automotive under-hood environments. The part integrates CIPs (Core Independent Peripherals), 12-bit ADC2 with Computation, CLC, DMA, vectored interrupts, UART, SPI, I2C, and rich analog such as DAC, comparators, ZCD and PWM/CWG/HLT/WWDT/SCAN/CRC blocks.
What is a PIC18 microcontroller? A PIC18 is an 8-bit Harvard-architecture RISC MCU from Microchip's PIC family. The PIC18 sub-family adds 16-bit instruction words, hardware multiply, C-compiler friendly architecture, and rich peripheral integration, sitting within the broader hierarchy: PIC18 -> 8-bit PIC -> PIC microcontroller -> microcontroller -> embedded processor -> semiconductor. K42-series parts in particular add Functional Safety features (windowed WDT, CRC/Scan, Memory Partitioning) targeted at IEC 61508 / SIL-aware designs.
Key features include a 12-bit ADC2 with Computation (ADC2) for automated capacitive voltage-divider touch sensing, DMA between peripherals and RAM, 5-bit DAC, 4 CLCs for hardware glue logic, Configurable Logic Cells, Zero-Cross Detect, Complementary Waveform Generator, High/Low-Timing modules, Windowed Watchdog Timer, and PPS (Peripheral Pin Select) for flexible signal routing. The XLP nanoWatt XLP sleep currents (under 50 nA typical in Sleep with RAM retention on the L-variant) make it attractive for battery or energy-harvesting endpoints.
The K42 architecture executes 16-bit instructions from Flash with a 31-level hardware stack and runs most instructions in a single 64 MHz clock cycle, while peripheral operation continues in Doze/Idle. Vectored interrupt handling provides fixed deterministic latency, and the System Bus Arbiter resolves DMA-vs-CPU conflicts automatically. The 12-bit ADC2 with post-processing computes averaging, oversampling and threshold compare in hardware, offloading the CPU for sensor-conditioning loops.
Typical applications include low-power IoT sensor nodes, capacitive-touch user interfaces, automotive body and HVAC controls, consumer appliances with displays, industrial sensor signal conditioning, USB-less serial bridge products, and functional-safety sensor endpoints. The wide 1.8 V - 5.5 V VDD range and -40C to +125C operation suit outdoor, industrial, and automotive under-hood zones.
A practical design tip: when migrating from the K40 or K22 families to the K42, re-verify the PPS assignments and the new 12-bit ADC2 trigger sources - the K42 introduces new trigger sources and removes some that existed on K40. Always program the WDT using the WWDT-conf (FCMEN, IESO, RTC) configuration words early in development so an unintended reset does not corrupt EEPROM writes.
This page synthesises distributor pricing, drop-in same-package alternatives (K40, K42 -I / -MV siblings, F-series 28-QFN PIC18s) and practical design guidance not all packaged together in the manufacturer datasheet, helping engineers evaluate fit and source the right part faster.
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