LS8397

UL ® LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 SYNC V SS HOME PHA INH1 PHB PHC INH2 PHD ENABLE RC NC LS8397 (631) 271-0400 FAX (631) 271-0405 April 2009 A3800 STEPPER MOTOR CONTROLLER FEATURES: Controls Bipolar and Unipolar Motors L297 operation with added functions: Selectable torque ripple compensated phase drive Selectable automated switching between stepping and holding torques Supply current < 400uA Half and full step modes Normal/wave drive Direction control Reset input Step control input Enable input PWM chopper circuit for current control Two over current sensor comparators with external references input All inputs and outputs TTL/CMOS compatible (TTL for 5V operation) 4.75V to 7V Operation (VDD – VSS). LS8397 (DIP), LS8397-S (SOIC), LS8397-TS (TSSOP) – See Figure 1 – DESCRIPTION: The LS8397 Stepper Motor Controller generates four phase drive signal outputs for controlling two phase Bipolar and four phase Unipolar motors. The outputs are used to drive two H-bridges for the two motor windings in the Bipolar motor or the four driver transistors for the two center- tapped windings in the Unipolar motor. The motor can be driven in full step mode either in normal drive (two-phase-on) or wave drive (one-phase-on) and half step mode. The LS8397 provides two inhibit outputs which are used to control the driver stages of each of the motor phases. The circuit uses STEP, FRD/REV and HALF/FULL inputs in a tra...