SLA7032M and SLA7033M ¼¼Êõ×ÊÁϼ°±¨¼Û£¨¸½PDFÎĵµ£©

DATASHEET PDF7032.pdf
¡¡¡¡¡öOutline
¡¡¡¡SLA7032M (SLA7033M) is a stepper motor driver IC developed
¡¡¡¡to reduce the number of external parts required by the conven-
¡¡¡¡tional SLA7024M (SLA7026M).  This IC successfully eliminates
¡¡¡¡the need for some external parts without sacrificing the features
¡¡¡¡of SLA7024M (SLA7026M).  The basic function pins are com-
¡¡¡¡patible with those of SLA7024M (SLA7026M).
¡¡¡¡¡öNotes on Replacing SLA7024M (SLA7026M)
¡¡¡¡SLA7032M (SLA7033M) is pin-compatible with SLA7024M
¡¡¡¡(SLA7026M). When using the IC on an existing board, the fol-
¡¡¡¡lowing preparations are necessary:
¡¡¡¡(1) Remove the resistors and capacitors attached for setting
¡¡¡¡the chopping OFF time.  (r3, r4, C1, and C2 in the catalog)
¡¡¡¡(2) Remove the resistors and capacitors attached for preventing
¡¡¡¡noise in the detection voltage VRS from causing malfunction-
¡¡¡¡ing and short the sections from which the resistors were re-
¡¡¡¡moved using jumper wires.  (r5, r6, C3, and C4 in the catalog)
¡¡¡¡(3) Normally, keep pins 2 and 13 grounded because their func-
¡¡¡¡tions have changed to synchronous and asynchronous
¡¡¡¡switching (SYNC terminals).  For details, see "Circuit for Pre-
¡¡¡¡venting Abnormal Noise When the Motor Is Not Running (Syn-
¡¡¡¡chronous circuit)."  (Low: asynchronous, High: synchronous)
¡¡¡¡¡öCircuit for Preventing Abnormal Noise When the
¡¡¡¡Motor Is Not Running (Synchronous Circuit)
¡¡¡¡A motor may generate abnormal noise when it is not running.  This
¡¡¡¡phenomenon is attributable to asynchronous chopping between
¡¡¡¡phases A and B.  To prevent the phenomenon, SLA7032M
¡¡¡¡(SLA7033M) contains a synchronous chopping circuit.  Do not leave
¡¡¡¡the SYNC terminals open because they are for CMOS input.
¡¡¡¡Connect TTL or similar to the SYNC terminals and switch the
¡¡¡¡SYNC terminal level high or low.
¡¡¡¡When the motor is not running, set the TTL signal high (SYNC
¡¡¡¡terminal voltage: 4 V or more) to make chopping synchronous.
¡¡¡¡When the motor is running, set the TTL signal low (SYNC terminal
¡¡¡¡voltage: 0.8 V or less) to make chopping asynchronous.  If chop-
¡¡¡¡ping is set to synchronous at when the motor is running, the motor
¡¡¡¡torque deteriorates before the coil current reaches the set value.
¡¡¡¡If no abnormal noise occurs when the motor is not running,
¡¡¡¡ground the SYNC terminals (TTL not necessary).
¡¡¡¡The built-in synchronous chopping circuit superimposes a trigger
¡¡¡¡signal on the REF terminal for synchronization between the two
¡¡¡¡phases.  The figure below shows the internal circuit of the REF
¡¡¡¡terminal.  Since the ?VREF varies depending on the values of R1
¡¡¡¡and R2, determine these values for when the motor is not run-
¡¡¡¡ning within the range where the two phases are synchronized.