The TMC2100 may be used with 3.3 V as well as with 5 V I/Os. Connect a supply voltage to VCC_IO accordingly. For noise filtering use a 100 nF capacitor against ground. The power supply terminals should be filtered with 100 nF capacitors as a good practice. In case VSA uses the same supply voltage as VM, the additional capacitor at VSA may be left away. Sense resistors define the motor current. A variant without sense resistors is shown later on.