PIC18F26K22T-I/ML
PIC18F26K22T-I/ML - 64MHz 8-bit MCU 64KB Flash | Microchip
The Microchip Technology PIC18F26K22T-I/ML is an 8-bit RISC flash microcontroller belonging to the PIC18F "K" series with nanoWatt XLP ultra-low-power technology, offering 64 KB of Flash program memory and 3,896 bytes of SRAM in a 28-pin QFN (6x6 mm, ML) package with exposed pad. The device integrates a 64 MHz internal oscillator (16 MIPS performance), 24 digital I/O pins, and a rich peripheral set including two USARTs, two MSSP (I2C/SPI) modules, two 10-bit ADC converters with up to 17 channels, two analog comparators with rail-to-rail inputs, and a programmable on-chip voltage reference.
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, RAM, non-volatile program memory, timers, communication peripherals and I/O pins in one package. 8-bit MCUs sit in the hierarchy: microcontroller -> embedded processor -> semiconductor IC, and remain the optimal choice for cost-sensitive, low-power, deterministic control tasks such as sensor interfacing, user I/O handling, motor control and battery-powered edge nodes where 32-bit performance is not required.
Key features of the PIC18F26K22 family include nanoWatt XLP sleep currents as low as 20 nA, flexible oscillator modes (HFINTOSC, LFINTOSC, EC, HS, XT, LP), a charge time measurement unit (CTMU) for capacitive touch sensing, an enhanced capture/compare/PWM module, and on-chip programmable high/low-voltage detect (PLVD) for robust brown-out behavior. The 28-QFN (6x6) package is the same land pattern as the related PIC18F25K22 and PIC18LF26K22, simplifying PCB reuse across variants.
Architecturally, the device uses a Harvard-style modified RISC core with a 16-bit instruction word, a hardware multiplier for 8x8 signed/unsigned operations, and a wide operating voltage range of 1.8 V to 5.5 V (F variant). The "T" suffix denotes tape-and-reel packaging for high-volume SMT assembly, and the "I" temperature grade specifies -40C to +85C industrial operation.
Typical applications include low-power IoT sensor nodes, portable medical and consumer devices, capacitive touch interfaces (buttons, sliders, proximity), USB device firmware via the MSSP, industrial control modules, and battery-powered metering equipment. The wide VDD range and nanoWatt XLP make the part particularly attractive for energy-harvesting and always-on designs.
When designing with this device, place the 28-QFN exposed pad (EP) on a continuous ground copper pour with at least 4 thermal vias to maximize heat dissipation and provide the lowest-impedance ground reference. Decouple VDD with a 100 nF ceramic capacitor placed within 2 mm of the supply pin and pair it with a bulk 1 uF to 10 uF capacitor on the same net. Always configure the CONFIG registers in code and lock them with the appropriate MCLRE and BOR settings to ensure robust operation.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes that go beyond the manufacturer datasheet, helping engineers evaluate the PIC18F26K22T-I/ML for embedded control, low-power wireless and touch-interface designs.
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