L297

L297 L297D STEPPER MOTOR CONTROLLERS NORMAL/WAWE DRIVE HALF/FULL STEP MODES CLOCKWISE/ANTICLOCKWISE DIRECTION SWITCHMODE LOAD CURRENT REGULATION PROGRAMMABLE LOAD CURRENT FEW EXTERNAL COMPONENTS RESET INPUT & HOME OUTPUT ENABLE INPUT DESCRIPTION The L297/A/D Stepper Motor Controller IC generates four phase drive signals for two phase bipolar and four phase unipolar step motors in microcomputer-controlled applications. The motor can be driven in half step, normal and wawe drive modes and on-chip PWM chopper circuits permit switchmode control of the current in the windings. A ABSOLUTE MAXIMUM RATINGS Symbol Vs Vi Ptot Tstg, Tj Supply voltage Input signals Total power dissipation (Tamb = 70°C) Storage and junction temperature Parameter Value 10 7 1 -40 to + 150 Unit V V W °C DIP20 SO20 ORDERING NUMBERS : L297 (DIP20) L297D (SO20) feature of this device is that it requires only clock, direction and mode input signals. Since the phase are generated internally the burden on the microprocessor, and the programmer, is greatly reduced. Mounted in DIP20 and SO20 packages, the L297 can be used with monolithic bridge drives such as the L298N or L293E, or with discrete transistors and darlingtons. TWO PHASE BIPOLAR STEPPER MOTOR CONTROL CIRCUIT August 1996 1/11 L297-L297D PIN CONNECTION (Top view) L297 L297D BLOCK DIAGRAM (L297/L297D) 2/11 L297-L297D PIN FUNCTIONS - L297/L297D N° 1 NAME SYNC FUNCTION Output of the on-chip chopper oscillator. The SYNC connections The SYNC conne...