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.
technique reduces dissipation in the load current sense resistors. A common on-chip oscillator drives the dual chop-per. It supplies pulses at the chopper rate which set the two flip-flops FF1 and FF2. When the current in a winding reaches the programmed peak value the voltage across the sense resistor (connected to
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