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TMC249 pdf datasheet
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Smart Power Microstepping PWM Motor Driver with sensorless stall detection (StallGuard™) external power transistors and protection, diagnostics and SPI Interface
The TMC249 is a smart high current microstepping driver for bipolar stepper motors. The integrated unique sensorless stall detection StallGuard™ makes it a good choice for applications, where a reference point is needed, but where a switch cannot be used. The ability to predict an overload makes the TMC249 an optimum choice for drives, where a high reliability is desired. It provides an SPI™ interface as well as the classical analog / digital control. A full set of protection and diagnostic features makes this device very rugged. It directly drives external MOSFETs for currents up to 6A. This way it reaches an extremely high efficiency and allows driving of a high motor current without cooling measures even at high environment temperatures. With the new chip-scale QFN package a 4A motor driver can be realized on the size of a stamp!
The high motor current makes this device ideal for miniaturized highly dynamic and high torque drive systems.
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