L297 - L297 L297D STEPPER MOTOR CONTROLLERS NORMAL/WAWE...

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L297 L297D STEPPER MOTOR CONTROLLERS NORMAL/WAWE DRIVE HALF/FULL STEP MODES CLOCKWISE/ANTICLOCKWISE DIRECTION SWITCHMODE LOAD CURRENT REGULA- TION PROGRAMMABLE LOAD CURRENT FEW EXTERNAL COMPONENTS RESET INPUT & HOME OUTPUT ENABLE INPUT DESCRIPTION The L297/A/D Stepper Motor Controller IC gener- ates four phase drive signals for two phase bipolar and four phase unipolar step motors in microcom- puter-controlled applications. The motor can be driven in half step, normal and wawe drive modes and on-chip PWM chopper circuits permit switch- mode control of the current in the windings. A August 1996 Symbol Parameter Value Unit V s Supply voltage 10 V V i Input signals 7V P tot Total power dissipation (T amb =70 ° C) 1 W T stg ,T j Storage and junction temperature -40 to + 150 ° C ABSOLUTE MAXIMUM RATINGS 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 micro- processor,and theprogrammer,is greatlyreduced. 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 DIP20 SO20 ORDERING NUMBERS : L297 (DIP20) L297D (SO20) 1/11
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PIN CONNECTION (Top view) BLOCK DIAGRAM (L297/L297D) 2/11 L297 L297D L297-L297D
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N ° NAME FUNCTION 1 SYNC Output of the on-chip chopper oscillator. The SYNC connections The SYNC connections of all L297s to be synchronized are connected together and the oscillator components are omitted on all but one. If an external clock source is used it is injected at this terminal. 2 GND Ground connection. 3 HOME Open collector output that indicates when the L297 is in its initial state (ABCD = 0101). The transistor is open when this signal is active. 4 A Motor phase A drive signal for power stage. 5 INH1 Active low inhibit control for driver stage of A and B phases. When a bipolar bridge is used this signal can be used to ensure fast decay of load current when a winding is de-energized. Also used by chopper to regulate load current if CONTROL input is low. 6 B Motor phase B drive signal for power stage. 7 C Motor phase C drive signal for power stage. 8 INH2 Active low inhibit control for drive stages of C and D phases. Same functions as INH1.
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L297 - L297 L297D STEPPER MOTOR CONTROLLERS NORMAL/WAWE...

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