EVALSP820-XS Evaluation Board STMicroelectronics EVALSP820-XS Evaluation Board is a compact, easy-to-use evaluation board for the STSPIN820 stepper motor driver. This STSPIN820 is a world's smallest 45V microstepping motor driver rated at 2.5A. The EVALSP820-XS board is compatible to use with RepRap Arduino Mega Pololu Shield (RAMPS) and similar open-source solutions for Fused Filament Fabrication (FFF) 3D printers. This EVALSP820-XS helps in working at high microstepping resolution, which can be set to one of eight available values through M1, M2, and M3 inputs. The STMicroelectronics EVALSP820-XS Evaluation Board features an embedded PWM current control with selectable decay mode and adjustable current through a potentiometer to set the reference voltage. Typical applications includes 3D printers, medical equipment, CCTV, robotics, ATM machines, and textile machines.