Stepper motor drivers

5 September 2012 Analogue, Mixed Signal, LSI

LSI/CSI announced the availability of three new high-performance stepper motor controller ICs. Designated the LS8297, LS8297CT and LS8397, they can replace the expensive L297 in all applications, while providing additional features not available in the L297.

The devices offer half-step and full-step sequences in both normal drive and wave drive modes similar to the L297. In addition the LS8297CT and the LS8397 offer correction for torque ripple, not provided in L297 half-step sequence.

A power-saving holding torque mode is also available in the LS8397 for maintaining the drivers at a reduced power level when the motor is not turning. Four phase outputs and two inhibit outputs are provided for driving external Hbridge drivers, allowing for the selection of a standard driver, such as the popular L298 or an application-specific custom driver.

An external reference voltage, in conjunction with the winding current sense voltages, regulate the PWM duty cycles of the driver outputs. One of two decay modes – fast-decay and slow-decay – can be selected to suit the characteristics of the motor winding.

The devices have inputs for step, forward/reverse, reset and output blanking control. They draw a supply current below 400 μA from a supply voltage of 4,5 V to 7 V.

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