1000
1001
3
4
5
1010
STEP
1
2
3
4
5
6
7
8
1
2
3
4
5
A
B
0001
2
6
0010
C
0101
1
HOME
8
0100
7
0110
D
INH1
INH2
FIGURE 4A. HALF-STEP MODE
STEP
1
3
5
7
1
3
5
7
1
3
5
7
1001
3
4
5
1010
A
B
2
6
C
0101
HOME
1
8
7
0110
D
INH1
0
INH2
0
FIGURE 4B. NORMAL DRIVE MODE (TWO-PHASE-ON)
STEP
2
4
6
8
2
4
6
8
2
4
6
8
1000
3
4
5
A
B
C
D
0001
2
6
0010
1
8
0100
7
INH1
INH2
FIGURE 4C. WAVE DRIVE MODE (ONE-PHASE-ON)
FIGURE 4. MOTOR DRIVING SEQUENCES
The
LS8297
generates phase sequences for half-step mode, normal drive mode and wave drive mode. Advancing occurs on the positive
edge of the STEP input signal. HOME is defined as PHA, PHB, PHC, PHD being 0101, respectively. The State Diagrams showing the
phase output polarities for all states are shown above for clockwise rotation. For counter clockwise rotation, the sequences are reversed.
RESET restores the phases to 0101 and State 1.
7297-081208-5
LSI [ LSI COMPUTER SYSTEMS ]
