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Friday, January 30, 2009

High Current Microstep Stepper Motor Driver

High Current Microstep Stepper Motor Driver
with protection

The TMC236 / TMC236A (1) is a dual full bridge driver IC for bipolar
stepper motor control applications. It is realized in a HVCMOS
technology combined with Low-RDS-ON high efficiency MOSFETs
(pat. pend.). It allows to drive a coil current of up to 1500mA even at
high environment temperatures. Its low current consumption and high
efficiency together with the miniature package make it a perfect
solution for embedded motion control and for battery powered devices.
The low power dissipation makes the TMC236 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.


• Control via SPI with easy-to-use 12 bit protocol or external
analog / digital signals
• Short circuit, overvoltage and overtemperature 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
(can be expanded to 64 microsteps)
• Any resolution via analog 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
• 7V to 34V motor supply voltage (A-type)
• Up to 1500mA output current and more than 800mA at 105°C
• 3.3V or 5V operation for digital part
• Low power dissipation via low RDS-ON power stage
• Standby and shutdown mode available

TMC236 Datasheet pdf

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