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AN2281 Datasheet(PDF) 34 Page - STMicroelectronics

Part # AN2281
Description  Low cost self-synchronizing PMAC motor drive using ST7FLITE35
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2281 Datasheet(HTML) 34 Page - STMicroelectronics

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List of software functions and interrupt service routines
AN2281
34/38
Figure 22. LT_ICAP_IT_Routine block diagram
LT_ICAP_IT_Routine
old_capture = new_capture
new_capture=LTICR
Is LT TB1 IT
flag set?
Yes
No
Yes
No
LTICR > 120?
OVF counter ++
@ next LTIC event
OVF counter++
Hall sensor semi-
period computing
and storing
Is Hall sensor
signal level high?
Yes
No
Sine phase = Phase_angle
Sine phase = Phase_angle + 180°
Enable/Refresh Watchdog
IRET



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