Features
   The TMC249 / TMC249A (1) is a dual full bridge driver IC for bipolar stepper motor control applications. The TMC249 is realized in a HVCMOS technology and directly drives eight external Low-RDS-ON high efficiency MOSFETs. It supports more than 6000mA coil current. The low power dissipation makes the TMC249 an optimum choice for drives, where a high reliability is desired. With additional drivers, motor current and voltage can be increased. The integrated unique sensorless stall detection (pat. pend.) stallGuard™ makes it a good choice for applications, where a reference point is needed, but where a switch is not desired. Its ability to predict an overload makes the TMC249 an optimum choice for drives, where a high reliability is desired. Internal DACs allow microstepping as well as smart current control. The device can be controlled by a serial interface (SPI™ i) or by analog / digital input signals. Short circuit, temperature, undervoltage and overvoltage protection are integrated.

• More than 6000mA using 8 external MOS transistors (e.g. 4A RMS)
• Sensorless stall detection stallGuard™ and load measurement integrated
• Control via SPI with easy-to-use 12 bit protocol or external analog / digital signals
• Short circuit, overvoltage and over temperature protection integrated
• Status flags for overcurrent, open load, over temperature, temperature pre-warning, undervoltage
• Integrated 4 bit DACs allow up to 16 times microstepping via SPI, any resolution via analog control (for up to 64 microsteps via SPI see last manual page)
• 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
• 7V to 34V motor supply voltage (A-type)
• up to 58V motor supply voltage using a few additional low cost components
• 3.3V or 5V operation for digital part
• Low power dissipation via low RDS-ON power stage
• Standby and shutdown mode available
• Choice of SO28 or chip size MLF package