PIC18F26K40-E/SS
PIC18F26K40-E/SS - 64KB Flash 8-bit MCU, 28-SSOP | Microchip
The Microchip Technology PIC18F26K40-E/SS is an 8-bit PIC18 microcontroller operating at up to 64 MHz with 64 KB Flash, 4 KB RAM, and 256 B EEPROM, housed in a 28-pin SSOP (5.30 mm) package. It supports 1.8 V to 5.5 V operation, integrates a 10-bit ADC with Computation (ADCC), a 5-bit DAC, three op-amps, Core Independent Peripherals (CIPs) such as CWG, WWDT, CRC/Memory Scan, Hardware CVD and Zero-Cross Detect, plus Peripheral Pin Select (PPS). The -E/SS suffix denotes the Extended (-40C to +125C) operating temperature range and SSOP package.
What is a microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripherals such as ADC, timers, and communication interfaces. MCUs sit at the bottom of the embedded computing hierarchy and are widely used to sense, decide, and actuate in real-time systems. The PIC18 family sits above baseline PIC10/12/16 parts by offering a 16-bit-wide instruction path with 8-bit data, C-optimized architecture, and rich peripheral integration, making it suited to consumer, industrial, and low-power IoT designs.
Key features include 64 KB self-programmable Flash with device-ID protection, 4 KB SRAM, 256 B EEPROM, a 10-bit ADCC capable of up to 35 channels with automated Capacitive Voltage Divider (CVD) for touch sensing, hardware 5-bit DAC, three operational amplifiers usable as signal-conditioning front-ends, and four 16-bit timers. Communication peripherals include I2C, SPI, EUSART with auto-baud detect, and the CIPs enable deterministic, CPU-independent operation such as waveform generation and windowed watchdog timing.
Architecturally, the PIC18F26K40 combines a Harvard RISC core running at up to 16 MIPS with an XLP (eXtreme Low Power) design that achieves nanoWatt sleep currents (typical < 60 nA in Sleep with RTCC) and active currents in the low microampere range. This makes it suitable for battery-powered applications that must wake, sense, transmit, and return to sleep quickly. The 5V-tolerant digital and analog blocks permit direct interfacing with legacy industrial sensors and 5V actuators without level shifters.
Typical applications include capacitive touch user interfaces (CVD), IoT sensor nodes with sleep duty-cycling, motor control (BLDC and stepper) using the CWG and PWM, industrial 4-20 mA loop instrumentation, automotive body and HVAC peripherals (non-safety), USB-to-UART bridges via the EUSART, and battery-powered medical devices such as glucose meters and pulse oximeters. The wide 1.8-5.5V range and 5V-tolerant I/O simplify mixed-voltage designs.
When designing with this MCU, select the appropriate -I (Industrial, -40C to +85C) or -E (Extended, -40C to +125C) grade for the target thermal envelope. Plan the Peripheral Pin Select (PPS) mapping early because remapping at runtime can break timing-critical CIP chains. Always enable the Windowed Watchdog and Memory Scan in safety-relevant designs.
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