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LS8297

LSI
Part Number LS8297
Manufacturer LSI
Description STEPPER MOTOR CONTROLLER
Published May 17, 2014
Detailed Description LSI/CSI UL ® LS8297 LS8297CT (631) 271-0400 FAX (631) 271-0405 April 2009 LSI Computer Systems, Inc. 1235 Walt Whitman...
Datasheet PDF File LS8297 PDF File

LS8297
LS8297

Overview
LSI/CSI UL ® LS8297 LS8297CT (631) 271-0400 FAX (631) 271-0405 April 2009 LSI Computer Systems, Inc.
1235 Walt Whitman Road, Melville, NY 11747 A3800 STEPPER MOTOR CONTROLLER FEATURES: • Controls Bipolar and Unipolar Motors • Cost-effective, low current, pin compatible replacement for L297 • Torque ripple compensated half-steps - LS8297CT • 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) • Supply current < 400uA • 4.
75 to 7V Operation (VDD – VSS).
• LS8297 (DIP), LS8297-S (SOIC), LS8297-TS (TSSOP) LS8297CT (DIP), LS8297CT-S (SOIC), LS8297CT-TS (TSSOP) – See Figure 1 – DESCRIPTION: The LS8297 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 LS8297 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 translator to generate controls for the output stages.
A dual PWM chopper circuit using an on-chip oscillator, latches and voltage comparators are used to regulate the current in the motor windings.
For each pair of phase driver outputs (PHA, PHB, and PHC, PHD) each pulse of the common internal oscillator sets the latch and enables the output.
If the current in the motor winding causes the voltage across a sense resistor to exceed the reference voltage, VREF, at the comparator inputs, the latch is reset disabling the output until t...


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