Start-up of the Spindle motor
• Not using external commutation mode
SPNENAB
EXTCOM
Low
COMM
PHASE
IU
0
HA13614FH
IV
0
IW
0
Synchronous driving*
B-EMF sensing driving
• Using external commutation mode
SPNENAB
EXTCOM
COMM
PHASE
IU
0
IV
0
IW
0
Synchronous driving*
B-EMF sensing driving
Note: “Synchronous driving” is defined as the period after changing SPNENAB = L to H until
the first positive edge of the PHASE signal.
Figure 8 Start-up of the Spindle Motor
13