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L297 Datasheet(PDF) 5 Page - STMicroelectronics |
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L297 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 11 page 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. Clockwise rotation is indicate; for anticlockwise ro- tation the sequences are simply reversed RESET restores the translator to state 1, where ABCD = 0101. HALF STEP MODE Half step mode is selected by a high level on the HALF/FULL input. NORMAL DRIVE MODE Normal drive mode (also called ”two-phase-on” drive) is selected by a low level on the HALF/FULL input when the translator is at an odd numbered state (1, 3, 5 or 7). In this mode the INH1 and INH2 outputs remain high throughout. 5/11 L297-L297D |
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