DRV10975ZPWPR datasheet(22/66 Pages) TI2

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Power on

ISDen

ISD

Forward

ClosedLoop

BrkEn

RvsDrEn

RvsDr

Align

IPD

Accelerate

IPDEn

Brake

DIR pin

change

Speed >

RvsDrThr

Speed >

Op2CIsThr

Time >

BrkDoneThr

Speed <

ISDThr

DRV10975, DRV10975Z

SLVSCP2F – JANUARY 2015 – REVISED JUNE 2020

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8.4.3 Motor Start Sequence

Figure 11 shows the motor start sequence implemented in the DRV10975.

Figure 11. 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 determines 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

is spinning too quickly. If the reverse speed of the motor is less than the threshold defined by

RvsDrThr[2:0], then the MSS advances to the RvsDrEn judgment.

RvsDrEn Judgment The MSS checks to see if the reverse drive function is enabled (RvsDrEn = 1). If it is, the

MSS transitions into the RvsDr state. If the reverse drive function is not enabled, the MSS

DRV10975ZPWPR Datasheet(PDF) 22 Page - Texas Instruments

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