The A3982 from Allegro MicroSystems Europe is a new bipolar stepper-motor driver IC that features built-in translator circuitry to make it easy to interface to microprocessor-based control systems in office automation and industrial applications.
This device has DMOS outputs rated at 35 V and ±1,5 A (2 A peak). The low 'on' resistance DMOS outputs, along with synchronous rectification, result in low-power dissipation. The device is controlled via a simple two-wire 'step' and 'direction' interface in full- or half-step modes, and is housed in a 24-pin SOIC package.
The translator is key to the easy implementation of the A3982. Simply inputting one pulse on the step input causes the motor to take one step. There are no phase sequence tables, high-frequency control lines or complex interfaces to program. As a result, the A3982 is ideal for applications with multiple motors that would normally push the I/O capacity of most microprocessor controllers.
Internal synchronous rectification control circuitry improves power dissipation during PWM operation. The A3982 also includes a fixed off-time output current regulator, which automatically selects slow- or mixed-decay modes. Allegro's patented current decay scheme results in reduced audible noise, increased step accuracy and reduced power dissipation.
Internal circuit protection includes thermal shutdown with hysteresis, undervoltage lockout and crossover current protection. Special power-up sequencing is not required.
For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]
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