PIC18LF27K40-I/ML
PIC18LF27K40-I/ML - 8-bit 64MHz XLP MCU 128KB Flash | Microchip
The Microchip Technology PIC18LF27K40-I/ML is an 8-bit PIC18K RISC microcontroller with 64 MHz CPU speed, 128 KB Flash program memory, and a 6x6 mm 28-pin QFN package, designed around Microchip's eXtreme Low Power (XLP) technology platform. The device combines large memory, rich analog and digital peripherals, and 1.8-3.6V wide-range supply support to suit battery-powered and industrial general-purpose applications. The 'LF' prefix denotes the low-voltage F-series process node optimized for ultra-low-power operation, while the 'I' temperature grade supports industrial -40C to +85C ambient operation.
What is a PIC18 Microcontroller? The PIC18 family is Microchip's 8-bit C-optimized RISC architecture, positioned above the PIC16 family and below the PIC24/dsPIC 16-bit families. PIC18 devices use a 16-bit instruction word, an 8-bit data path with hardware multiplier, hardware stack, and rich peripheral integration (ADC, PWM, CCP, CWG, EUSART, MSSP I2C/SPI). The 'LF' sub-series adds XLP technology with sub-uA sleep currents and IDLE/DOZE power modes. The PIC18LF27K40 specifically targets applications that demand large Flash/RAM, 5V-tolerant mixed-signal IO, and Core Independent Peripherals (CIPs) such as Complementary Waveform Generator (CWG), Windowed Watchdog Timer (WWDT), and CRC/SCAN memory verification.
Key features include 128 KB Flash, 3.7 KB RAM, 1 KB EEPROM, a 10-bit ADC up to 350 ksps with computation, multiple PWM/SCCP/DCCP channels, EUSART, two I2C/SPI MSSP ports, and DMA-to-memory for low-CPU-overhead data movement. The XLP subsystem supports Sleep currents below 1 uA with RTCC, watchdog, and interrupt wake-up, enabling multi-year coin-cell operation in sensor and metering designs. The 28-QFN (6x6 mm) package exposes an EP pad that must be soldered to a ground copper pour for thermal dissipation and electrical reference.
The PIC18LF27K40 uses a 16-bit instruction set with 8-bit data bus, 31-level hardware stack, and a 2-cycle hardware divider. The internal 64 MHz oscillator can be software-tuned via OSCTUNE, and the auxiliary PLL supports USB-friendly 48 MHz and reference clock domains. Core Independent Peripherals - CWG, NCO, CLC, and DSM - allow complex waveform generation, signal modulation, and logic gating without CPU intervention, reducing firmware complexity and improving deterministic real-time response.
Typical applications include low-power IoT sensor nodes, battery-backed instrumentation, industrial control front-ends, small appliance controllers, USB-CDC/HID human-interface devices, and remote controls. The wide 1.8-3.6V supply window lets designers run directly from a single Li-ion or two AA cells without a boost converter. For a designer choosing this part, the headline advantage is the integration of XLP technology with mid-density Flash and CIPs in a small 28-QFN footprint, eliminating the need for a separate low-power supervisory IC. The 28-QFN EP pad must be soldered to the PCB ground plane to meet thermal and EMI performance; omitting it can cause ADC offset drift and latch-up under temperature stress.
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