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DRV10975 Datasheet(PDF) 18 Page - Texas Instruments |
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DRV10975 Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 57 page  Power on ISDen ISD N Y Y Forward ClosedLoop N Y N BrkEn RvsDrEn Y N N RvsDr Align IPD Accelerate IPDEn N Y N Y N Y Y N Brake Y DIR pin change Speed > RvsDrThr Speed > Op2CIsThr Speed > BrkDoneThr Speed < ISDThr DRV10975 SLVSCP2 – JANUARY 2015 www.ti.com Figure 9. Motor Starting-Up Flow Power-On State This is the initial power-on state of the motor start sequencer (MSS). The MSS starts in this state on initial power-up or whenever the DRV10975 comes out of either standby or sleep modes. ISDen Judgment After power-on, the DRV10975 MSS enters the ISDen Judgment where it checks to see if the Initial Speed Detect (ISD) function is enabled (ISDen = 1). If ISD is disabled, the MSS proceeds directly to the BrkEn Judgment. If ISD is enabled, the motor start sequence advances to the ISD state. ISD State The MSS will determine the initial condition of the motor (see ISD). Speed<ISDThr Judgment If the motor speed is lower than the threshold defined by ISDThr[1:0], then the motor is considered to be stationary and the MSS proceeds to the BrkEn judgment. If the speed is greater than the threshold defined by ISDThr[1:0], the start sequence proceeds to the Forward judgment. Forward Judgment The MSS determines whether the motor is spinning in the forward or the reverse direction. If the motor is spinning in the forward direction, the DRV10975 executes the resynchronization (see Motor Resynchronization) process by transitioning directly into the ClosedLoop state. If the motor is spinning in the reverse direction, the MSS proceeds to the Speed>RvsDrThr. Speed>RvsDrThr Judgment The motor start sequencer checks to see if the reverse speed is greater than the threshold defined by RvsDrThr[2:0]. If it is, then the MSS returns to the ISD state to allow the motor to decelerate. This prevents the DRV10975 from attempting to reverse drive or brake a motor that 18 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: DRV10975 |
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