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L6238 Datasheet(PDF) 9 Page - STMicroelectronics |
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L6238 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 35 page  2.0 STATE DIAGRAMS 2.1 State Diagram Figure 4 is a complete State Diagram of the con- troller depicting the operational flow as a function of the control pins and motor status. The flow can be separated into four distinct operations. 2.2 Align + Go Figure 5 represent the normal flow that will achieve a spin-up and phase lock of the spindle motor. Upon power up, the controller first checks to determine if the motor is still spinning. This ”Hold For Resync” decision block will be dis- cussed later. Hol d & wait f or de cisio n RunBrk = 0 RunBrk = 1 Hold for ”Ali gn & Go ” Hold for ”Res ync” Start ”Align & Go” Align = Se qncr. Run Alig n = 0 G o = 0 Power on Reset RunBrk = 1 OutEna = 0 OutEn a = 0 & Ru nBrk = 0 Figure 5: Align+Go L6238 9/35 |
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