AN1139 STMicroelectronics, AN1139 Datasheet - Page 15

• Manufacturer Part Number: AN1139
• Description: L6254 - L6268 - L6269 12V DISK DRIVE POWER COMBO IC
• Manufacturer: STMicroelectronics

Figure 4. Inductive Sense Flow Chart
Increment TRIAL
Set PHASE=1
Increment
P H A S E
N O
N O
Get the PHASE with a most
Bring the Sequencer to the
according to PHASE and
Store Initial TIME Period
Provide Current to Coils
Raise Start-Up Current
Hardware Initialization
frequent shortest time
Hardware Zero Cross
PHASE detected
Phase Increment
Alignament Time
Phase Increment
with lowest Time
Set PHASE= 1
TIME < Stored
Store PHASE
Set Threshold
Read Counter
Store PHASE
Start Counter
Stop Counter
Ground Coils
Set TRIAL=1
Store TIME
Mask Time
P H A S E = 6
Threshold
Threshold
Detection
Reached
TRIAL=5
B E G I N
E N D
time
is
?
?
?
?
YES
Yes
Yes
YES
N O
N O
greater than
is TIME
50mS
?
N O
AN1139 APPLICATION NOTE
YES
Lower Threshold
Stop Counter
Ground Coil
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