Datasheet

TMC2300 DATASHEET (Rev. 1.02 / 2019-NOV-06) 8
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Efficiency
Velocity [RPM]
Efficiency with coolStep
Efficiency with 50% torque reserve
Figure 1.4 Energy efficiency with coolStep (example)
1.7 Automatic Standstill Power Down
An automatic current reduction drastically reduces application power dissipation and cooling
requirements. Per default, the stand still current reduction is enabled by pulling PDN_UART input to
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. 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!
t
CURRENT
TPOWERDOWN
power down
delay time
RMS motor current trace with pin PDN=0
IHOLD
IRUN
IHOLDDELAY
power down
ramp time
STEP
Figure 1.5 Automatic Motor Current Power Down
1.8 Index Pulse
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.
UART