L6228Q View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6228Q' PDF : 32 Pages View PDF
Circuit description
L6228Q
4.5.2
4.5.3
Normal drive mode (full-step two-phase-on)
A low level on the HALF/FULL input selects the full-step mode. The normal drive mode is
selected if the low level is applied when the state machine is at an ODD state. Figure 19
shows the motor current waveform state diagram for the state machine of the phase
sequencer generator. The normal drive mode can easily be selected by holding the
HALF/FULL input low and applying a RESET. At startup or after a RESET the state machine
is in state 1. While the HALF/FULL input is kept low, the state changes following the
sequence 1,3,5,7,… if CW/CCW is high (clockwise movement) or 1,7,5,3,… if CW/CCW is
low (counterclockwise movement).
Wave drive mode (full-step one-phase-on)
A low level on the pin HALF/FULL input selects the full-step mode. The wave drive mode is
selected if the low level is applied when the state machine is at an EVEN state. Figure 20
shows the motor current waveform and the state diagram for the state machine of the phase
sequence generator. To enter the wave drive mode, the state machine must be in an EVEN
numbered state. The most direct method to select the wave drive mode is to apply a RESET
first, then while keeping the HALF/FULL input high, applying one pulse to the clock input,
then taking the HALF/FULL input low. This sequence forces the state machine to state 1.
The clock pulse, with the HALF/FULL input high, advances the state machine from state 1 to
either state 2 or 8 depending on the CW/CCW input. Starting from this point, after each
clock pulse (rising edge) advances the state machine following the sequence 2,4,6,8,… if
CW/CCW is high (clockwise movement) or 8,6,4,2,… if CW/CCW is low (counterclockwise
movement).
Figure 18. Half-step mode
3
4
5
IOUTA
2
6
1
8
7
IOUTB
Start Up or Reset
CLOCK
12345678
D01IN1320
Figure 19. Normal drive mode
IOUTA
3
4
5
2
6
IOUTB
1
8
7
Start Up or Reset
CLOCK
13 5 7 1 3 5 7
D01IN1322
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Doc ID 14321 Rev 5
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