Transcription of Stepper motor controllers - STMicroelectronics
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Stepper motor controllers - STMicroelectronics
L297 Stepper motor CONTROLLERSNORMAL/WAVE DRIVEHALF/FULL STEP MODESCLOCKWISE/ANTICLOCKWISE DIRECTIONSWITCHMODE LOAD CURRENT REGULA-TIONPROGRAMMABLE LOAD CURRENTFEW EXTERNAL COMPONENTSRESET INPUT & HOME OUTPUTENABLE INPUTDESCRIPTIONThe L297 Stepper motor Controller IC generatesfour phase drive signals for two phase bipolar andfour phase unipolar step motors in microcomputer-controlled applications. The motor can be driven inhalf step, normal and wawe drive modes and on-chip PWM chopper circuits permit switch-modecontrol of the current in the windings. A feature ofDecember 2001 SymbolParameterValueUnitVsSupply voltage10 VViInput signals7 VPtotTotal power dissipation (Tamb = 70 C)1 WTstg, TjStorage and junction temperature-40 to + 150 CABSOLUTE MAXIMUM RATINGS this device is that it requires only clock, directionand mode input signals.
Physical direction of motor rotation also depends on connection of windings. Synchronized internally therefore direction can be changed at any time. 18 CLOCK Step clock. An active low pulse on this input advances the motor one increment. The step occurs on the rising edge of this signal. PIN FUNCTIONS - L297/1 - L297D 3/11 L297
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