PIC18F26K20-I/SS
PIC18F26K20-I/SS - 8-bit PIC MCU, 64KB Flash, 64MHz, SSOP-28
The Microchip Technology PIC18F26K20-I/SS is an 8-bit PIC microcontroller from the PIC18FxxK20 family featuring 64 KB of Flash program memory, 3,968 bytes of RAM, and 1,024 bytes of EEPROM, packaged in a 28-pin SSOP with nanoWatt XLP ultra-low-power technology. It operates at up to 64 MHz clock speed (16 MIPS performance) from a 1.8V to 5.5V supply, and integrates 25 digital I/O pins, a 10-bit ADC with up to 14 channels, multiple timers, and standard serial peripherals. According to the Microchip product page, the part is currently listed as In Production.
What is a PIC18 microcontroller? The PIC18 is Microchip's 8-bit C-optimized microcontroller family, positioned above the PIC16 line. PIC18 MCUs use a 16-bit modified Harvard architecture with separate program and data buses, 31-level hardware stack, and a RISC-like instruction set with hardware multiplier. They span the hierarchy: PIC18 -> 8-bit MCU -> microcontroller -> embedded controller. PIC18FxxK20 devices specifically target ultra-low-power applications via nanoWatt XLP technology, which adds deep-sleep modes drawing nanoamp-range currents suitable for battery-powered and energy-harvesting designs.
Key features of the PIC18F26K20 include 64 KB self-programmable Flash, 1 KB EEPROM, 3,968 bytes SRAM, 25 I/O with individual pull-up control, a 10-bit A/D converter with 14-channel input mux, two analog comparators, a 5-bit DAC, three timers (Timer0/1/2), two capture/compare modules, an Enhanced USART (EUSART) supporting RS-232/RS-485, MSSP for SPI and I2C (master/slave), and an internal 16 MHz oscillator with PLL.
From an architectural perspective, the part uses Microchip's enhanced mid-range core with a C-friendly orthogonal instruction set, hardware multiply, indexed addressing, and 31-level call/return stack. nanoWatt XLP delivers typical sleep currents below 100 nA with RTC running, allowing years of operation from a single coin cell. The device supports ICSP (In-Circuit Serial Programming) and ICD (In-Circuit Debug) via two pins, enabling fast prototyping and field firmware updates.
Typical applications include industrial sensor nodes, battery-powered data loggers, home automation controllers, low-energy IoT endpoints, HVAC control modules, consumer electronics with USB/serial connectivity, and small appliances where 25 I/O and integrated 10-bit ADC handle mixed-signal interfaces. The wide 1.8V-5.5V supply simplifies direct battery connection (1S Li-Ion, 3xAA, or coin cell with boost).
When designing, always place a 100 nF decoupling capacitor within 5 mm of each VDD pin and bulk 1-10 uF on the supply rail. Reserve MCLR with the standard 10 kohm pull-up, and add an ICSP header for programming/debug. Watch the total current budget when averaging with sleep duty cycle to maximize battery life.
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