L297 STEPPER MOTOR CONTROLLERS NORMAL/WAVE DRIVE HALF/FULL STEP MODES CLOCKWISE/ANTICLOCKWISE DIRECTION SWITCHMODE LOAD CURRENT REGULA- TION PROGRAMMABLE LOAD CURRENT DIP20 SO20 FEW EXTERNAL COMPONENTS ORDERING NUMBERS : L297/1 (DIP20) RESET INPUT & HOME OUTPUT L297D (SO20) ENABLE INPUT DESCRIPTION this device is that it requires only clock, direction and mode input signals. Since the phase are gen- The L297 Stepper Motor Controller IC generates erated internally the burden on the microprocessor, four phase drive signals for two phase bipolar and and the programmer, is greatly reduced. Mounted four phase unipolar step motors in microcomputer- in DIP20 and SO20 packages, the L297 can be controlled applications. The motor can be driven in used with monolithic bridge drives such as the half step, normal and wawe drive modes and on- L298N or L293E, or with discrete transistors and chip PWM chopper circuits permit switch-mode darlingtons. control of the current in the windings. A feature of ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Supply voltage 10 V s V Input signals 7V i P Total power dissipation (T = 70C) 1W tot amb T , T Storage and junction temperature -40 to + 150 C stg j TWO PHASE BIPOLAR STEPPER MOTOR CONTROL CIRCUIT December 2001 1/11L297 (Top view) PIN CONNECTION L297/1 L297D BLOCK DIAGRAM (L297/1 - L297D) 2/11