Trinamic’s TMC6200 offers 3 differential current amplifiers for current measurement in series with the motor coil. Add an external sense resistor by selecting the resistance and power rating fitting to the motor current. A sense resistor is the most common means to set the motor current. It provides best precision when using a 1% type. However, a 5% type also performs fine for most applications. The selection of fitting sense resistors depends on the following considerations: The maximum current to be driven into the motor. Use the peak value required. To get more power out of a motor, one can provide a boost current above the nominal current. Up to 50% more current is realistic for short moments like acceleration phase. The maximum power dissipation resulting from the selection of the resistor. A 0805 resistor is sufficient for 1A of motor current, higher currents require 2010 or 2512 resistors. Working with a lower amplification, for example: 5 times amplification and double resistance of the value calculated for 10 times amplification, will improve offset error as the usable sense signal is larger. The drawback of a higher sense resistor value is increased power dissipation in the resistor. However, RMS current often is much lower than the peak current, for which the design has to be configured.