TMC389-EVAL MANUAL (V. 1.10 / 2011-Mar-01)
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Copyright © 2010 TRINAMIC Motion Control GmbH & Co. KG
figure 4: Evaluation software: Microstep resolution setting
figure 5: Evaluation software: Starting the motor
6.1.4
Clock frequency setting
You can modify the TMC262 clock frequency delivered from the CPU to the TMC262. As also the SPI
and Step signal input synchronization are affected by this setting, we advise working with 16MHz or
with the internal clock frequency (Jumper setting for internal or external CLK should be done before
board power up). Default is 16MHz.
6.1.5
Using stallGuard2™ and coolStep™
In order to use the stallGuard2™ functionality and coolStep™, you should first tune the stallGuard2™
sensitivity. As a first step, you should enable the stallGuard™ filter bit SFILT in the tab SGCSCONF.
figure 6: Evaluation software: coolStep setting
Therefore, operate the motor at a reasonable velocity (taking into account your application) and look at
the stallGuard™ value (SG) in the DRVSTATUS tab or watch the stallGuard value in the Graph tab.
Now, apply slowly increasing mechanical load to the motor. If the motor stalls before the stallGuard™
value reaches zero, go to the SGSCONF tab and decrease the stallGuard threshold value (SGT). A
good starting value is zero. You can apply negative values and positive values. If the values leave a
