Motor-control 8-bit MCU in a through-hole DIP
The Microchip PIC18F2331-I/SP is an 8-bit PIC® 18F family MCU built for applications that need deterministic control-loop timing and quadrature encoder feedback. Its 40 MHz core clock drives the Power Control PWM and Quadrature Encoder Interface (QEI) peripherals — a combination that targets brushless DC motor drives, servo positioning, and industrial actuator control. The 28-pin SPDIP through-hole package suits prototyping, low-volume builds, or boards where vibration resistance and socketability matter. With 8 KB Flash, 768 bytes RAM, and 256 bytes EEPROM, it fits firmware footprints for sensor-fusion loops, PID controllers, and Modbus node endpoints.
40 MHz — what it buys in a control loop
At 40 MHz instruction execution (most single-cycle), the PIC18F2331 can service a PWM interrupt and update the duty cycle within a few microseconds. The QEI peripheral decodes encoder pulses in hardware, offloading the core for higher-level commutation logic. The 5-channel 10-bit ADC samples current-sense or position signals at rates that keep the loop bandwidth above 1 kHz — adequate for mid-speed BLDC and stepper drives.
Industrial temperature and active lifecycle
That means it remains qualified for new production builds and can be dual-sourced through independent distribution without LTB risk. ROHS3 compliant.
I/O and connectivity for sensor and actuator nodes
The Brown-out Detect/Reset and Low-Voltage Detect protect against supply droop in noisy industrial environments. Program memory is Flash, so firmware updates are possible in-system via the UART bootloader or ICSP™ — no UV eraser needed.