TMC5161 DATASHEET (Rev. 1.01 / 2018-NOV-20)
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11.3 Open Load Diagnostics
Interrupted cables are a common cause for systems failing, e.g. when connectors are not firmly
plugged. The TMC5161 detects open load conditions by checking, if it can reach the desired motor coil
current. This way, also undervoltage conditions, high motor velocity settings or short and
overtemperature conditions may cause triggering of the open load flag, and inform the user, that
motor torque may suffer. In motor stand still, open load cannot be measured, as the coils might
eventually have zero current.
Open load detection is provided for system debugging.
In order to safely detect an interrupted coil connection, read out the open load flags at low or
nominal motor velocity operation, only. If possible, use spreadCycle for testing, as it provides the
most accurate test. However, the ola and olb flags have just informative character and do not cause
any action of the driver.
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