LS8292

LSI/CSI PRELIMINARY FEATURES: Controls Bipolar and Unipolar stepper motors Step modes: Full, 1/2, 1/4, 1/8, 1/16 and 1/32 PWM outputs for external H-bridge drivers Precision DAC reference for PWM sense comparators Fast, Slow and mixed decay modes Power saving holding torque for idling motor Automatic switching to holding torque with programmable delay when motor idles Programmable delay for sense input blanking Programmable delay for mixed decay cycles Input for Step command Input for Direction control Input for Reset to HOME Input for disabling PWM outputs Input/output for external clock or built-in oscillator Supply current < 400uA Supply voltage 4.5V to 5.5V LS8292 (DIP), LS8292-S (SOIC), LS8292-TS (TSSOP) LS8293 (DIP), LS8293-S (SOIC), LS8293-TS (TSSOP) DESCRIPTION: LS8292 and LS8293 are stepper motor controllers with selectable resolutions from Full to 1/32 step. There are four phase drive outputs and two inhibit outputs for controlling 2phase bipolar or 4-phase unipolar motors. These outputs are designed to drive two external H-bridge drivers for bipolar motor windings or four external transistors for center-tapped unipolar motor windings. These outputs can also be configured to drive discrete external transistors for bipolar motor windings. A lookup table sources the PWM duty cycle digital data for the two motor windings corresponding to the step sequence. Two internal DACs convert the PWM data to analog voltages as percentages of the reference voltage applied at the V...