The ccdriver stepper driver boards are made as pluggable modules to a electronics motherboard. A good reason of this design is, that it is easy to exchange the Pololu boards when troubleshooting - or when a board has burned out.
FEATURES OF ccDriver LV8729V chip Motor voltage 10 – 25V Motor current 0 to 1.8 A adjustable via potentiometer (V-REF) Up to 128 micro steps possible (recommended maximum of 64 micro steps for 8-bit electronics, such as Arduino Mega with RAMPS.) Short Circuit Shutdown Pre-installed heat sink The size corresponds to the popular Pololu drivers and the pinout is compatible but not identical. Max 1/128 micro stepping when used in combination with 32-bits controllers that supports 1/128 micro stepping Can be used on RAMPS, rumba and other RepRap electronics, but 8-bit electronics usually are too slow for 1/64 and 1/128 micro stepping. CAUTION: Inverted activation signal Enable = HIGH (at Pololu drivers enable = LOW, invert in firmware!)