Datasheet TMC2226 (TRINAMIC) - 8

TMC2226 DATASHEET (Rev. 1.06 / 2020-MAY-18) 8 GND. It reduces standstill power dissipation to less than 33% by going to slightly more than half of the run current. Modify stand still current, delay time and decay via UART, or pre-programmed via internal OTP. Automatic freewheeling and passive motor braking are provided as an option for stand still. Passive braking reduces motor standstill power consumption to zero, while still providing effective dampening and braking! STEP CURRENT IRUN IHOLD t TPOWERDOWN IHOLDDELAY power down power down RMS motor current trace with pin PDN=0 delay time ramp time
Figure 1.4 Automatic Motor Current Power Down 1.8 Index Output
The index output gives one pulse per electrical rotation, i.e. one pulse per each four fullsteps. It shows the internal sequencer microstep 0 position (MSTEP near 0). This is the power on position. In combination with a mechanical home switch, a more precise homing is enabled.
1.9 Precise clock generator and CLK input
The TMC2226 provides a factory trimmed internal clock generator for precise chopper frequency and performance. However, an optional external clock input is available for cases, where quartz precision is desired, or where a lower or higher frequency is required. For safety, the clock input features timeout detection, and switches back to internal clock upon fail of the external source. www.trinamic.com