Microstep Driver for External MOSFETs for up to 4A

   The TMC239 is a smart high current microstepping driver for bipolar stepper motors. 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 of up to 4A. (A list of compatible power MOSFETs is given within the datasheet.) This way it reaches an extremely high efficiency and allows driving of a high motor current without cooling measures even at high environment temperatures.

MAIN CHAR ACTERISTICS
• full protection and diagnostics
• low power dissipation
• 16 times microstepping via SPI,
   64 times using additional shift register,
   even more via analog control
• mixed decay for smooth operation
• programmable slope control for low EME
• internal or external chopper clock
• standby and shutdown mode
• easy-to-use SPI™ interface
• classical analog interface
• up to 4000 mA coil current (peak) with
   just 4 external dual MOSFETS
• 7V to 34V motor supply (TMC239A),
   up to 60V using a few add. components
• higher current / voltage using additional
   gate drivers
• 3.3V or 5V operation for digital part
• standard SO28 package
• chip size QFN32 package
• RoHS compliant