TMC260 and TMC261 DATASHEET (Rev. 2.05 / 2012-NOV-05)
29
In Figure 7.3, the first STEP cycle is long enough to set the STST bit. This bit is cleared on the next
STEP active edge. Then, the STEP frequency increases and after one cycle at the higher rate microPlyer
increases the interpolated microstep rate. During the last cycle at the slower rate, microPlyer did not
generate all 16 microsteps, so there is a small jump in motor angle between the first and second
cycles at the higher rate.
7.5 Standstill current reduction
When a standstill event is detected, the motor current should be reduced to save energy and reduce
heat dissipation in the power MOSFET stage. This is especially true at halfstep positions, which are a
worst-case condition for the driver and motor because the full energy is consumed in one bridge and
one motor coil.
www.trinamic.com
TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
