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TMC249 Smart Power Micro-stepping PWM Motor Driver with sensor-less stall detection (stallGuard™) external power transistors and protection, diagnostics and SPI Interface

Description
The TMC249 is a smart high current micro-stepping driver for bipolar stepper motors. The integrated unique sensor-less stall detection stallGuard™ makes it an ideal choice for applications where a reference point is needed, but a switch cannot be used. The ability to predict an overload makes the device an optimum drive where  high reliability is required.
It provides an SPI™ interface as well as the classical analogue / digital control and a full set of protection and diagnostic features making this device very rugged. It directly drives external MOSFETs for currents up to 6A which means it reaches an extremely high efficiency to allow driving of a high motor current without cooling measures even at high environment temperatures.
With the new chip-scale QFN package which is so small a 4A motor driver is produced on something the size of a stamp! The high motor current makes this device most suitable for miniaturised highly dynamic and high torque drive systems.

Specifications

• Integrated sensor-less stall detection stallGuard™ and load measurement
• Control via SPI with easy-to-use 12 bit protocol or external analogue / digital signals
• Integrated short circuit and over temperature protection
• Integrated over-voltage protection
• Status flags for over-current, open load, over temperature, temperature pre-warning and under-voltage
• Integrated 4 bit DACs allow up to 16 times micro-stepping via SPI, any resolution via analogue control
• Mixed decay feature for smooth motor operation
• Slope control user programmable to reduce electromagnetic emissions
• Chopper frequency programmable via a single capacitor or external clock
• Current control allows cool motor and driver operation
• Internal open load detector
• Motor supply voltage 7V to 34V
• More than 6000mA using 8 external MOS transistors
• External drivers can be added for higher motor voltages and higher currents (e.g. 50V, 5A)
• Only 4 external PMOS transistors required for unipolar operation
• 3.3V or 5V operation for digital part
• Low power consumption via low RDS-ON power stage

Standby and shutdown mode available

 

 

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