Worcester, Mass. - Allegro MicroSystems' A3980, an automotive-friendly addition to the company's line of microstepping motor driver ICs, features a unique two-wire interface with translator for control of step, step-size, and direction. The interface and translator provide for operating bipolar stepper motors in full-, half-, eighth-, and sixteenth-step modes without the need for a complex system controller. To enhance microstepping performance, the A3980 can operate in slow, fast, and mixed current-decay modes, which further reduces audible noise and minimizes motor heating and torque ripple.
Other features of the bipolar-CMOS-DMOS device include integrated fault diagnostics and reporting. Its DMOS outputs are protected against short-to-battery and short-to-ground conditions. Two output pins (open drain) report faults for over-voltage, under-voltage, over-temperature, and short-circuits to battery or ground.
The chip, working from a 7-35 volt input, is rated for applications to ±1 amp at 35 volts. Its battery over-voltage sense feature allows the IC to stand-off up to 50 volts, allowing the chip to meet automotive IC load-dump requirements.
The A3980, in a thermally-enhanced 28-lead TSSOP package, is rated for operation over a junction temperature range of -40 to +150°C. It's priced at $2.55 each in 5k quantites.