L297 STMicroelectronics, L297 Datasheet
L297
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L297 Summary of contents
Page 1
... Since the phase are gen- erated 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 ...
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... L297 PIN CONNECTION (Top view) BLOCK DIAGRAM (L297/1 - L297D) 2/11 L297/1 L297D ...
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... An RC network ( ground) connected to this terminal CC determines the chopper rate. This terminal is connected to ground on all but one device in synchronized multi - L297 configurations. f 1/0.69 RC Clockwise/counterclockwise direction control input. Physical direction of motor rotation also depends on connection of windings. ...
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... Half/full step select input. When high selects half step operation, when low selects full step operation. One-phase-on full step mode is obtained by selecting FULL when the L297’s translator even-numbered state. Two-phase-on full step mode is set by selecting FULL when the translator odd numbered position. (The home position is designate state 1) ...
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... MOTOR DRIVING PHASE SEQUENCES The L297’s translator generates phase sequences for normal drive, wave drive and half step modes. The state sequences and output waveforms for these three modes are shown below. In all cases the translator advances on the low to high transis- tion of CLOCK ...
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... L297 MOTOR DRIVING PHASE SEQUENCES (continued) WAVE DRIVE MODE Wave drive mode (also called "one-phase-on" drive) is selected by a low level on the HALF/FULL input when the translator even numbered state ( 8). ELECTRICAL CHARACTERISTICS (Refer to the block diagram T specified) Symbol ...
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... Input reference voltage (pin 15) ref t Clock time CLK t Set up time S t Hold time H t Reset time R t Reset to clock delay RCLK Figure 1. Test conditions ref L297 Min. Typ Max. Unit -100 0 ...
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... L297 APPLICATION INFORMATION TWO PHASE BIPOLAR STEPPER MOTOR CONTROL CIRCUIT This circuit drives bipolar stepper motors with winding currents up to 2A. The diodes are fast 2A types. Figure 2. Figure 3 : Synchronising L297s 8/11 ...
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... DIM. MIN. TYP. MAX. MIN. a1 0.254 0.010 B 1.39 1.65 0.055 b 0.45 b1 0.25 D 25.4 E 8.5 e 2.54 e3 22.86 F 7.1 I 3.93 L 3.3 Z 1.34 inch MECHANICAL DATA TYP. MAX. 0.065 0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053 L297 OUTLINE AND DIP20 9/11 ...
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... L297 mm DIM. MIN. TYP. MAX. A 2.35 2.65 0.093 A1 0.1 0.3 0.004 B 0.33 0.51 0.013 C 0.23 0.32 0.009 D 12.6 13 0.496 E 7.4 7.6 0.291 e 1. 10.65 0.394 h 0.25 0.75 0.010 L 0.4 1.27 0.016 K 0˚ (min.)8˚ (max 10/11 inch MIN. TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050 OUTLINE AND ...
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... STMicroelectronics – Printed in Italy – All Rights Reserved Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. STMicroelectronics GROUP OF COMPANIES http://www.st.com L297 11/11 ...