DRV10975ZPWPR datasheet(23/65 Pages) TI1

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DRV10975, DRV10975Z

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SLVSCP2E – JANUARY 2015 – REVISED MAY 2018

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advances to the BrkEn judgment.

RvsDr State The DRV10975 drives the motor in the forward direction to force it to rapidly decelerate (see

Reverse Drive). When it reaches zero velocity, the MSS transitions to the Accelerate state.

BrkEn Judgment The MSS checks to determine whether the brake function is enabled (BrkDoneThr[2:0]

≠ 000).

If the brake function is enabled, the MSS advances to the Brake state.

Brake State The device performs the brake function (see Motor Brake).

Time>BrkDoneThr Judgment The MSS applies brake for time configured by BRKDoneThr[2:0]. After brake

state, the MSS advances to the IPDEn judgment.

IPDEn Judgment The MSS checks to see if IPD has been enabled (IPDCurrThr[3:0]

≠ 0000). If the IPD is

enabled, the MSS transitions to the IPD state. Otherwise, it transitions to the align state.

Align State The DRV10975 performs align function (see Align). After the align completes, the MSS transitions

to the Accelerate state.

IPD State

The DRV10975 performs the IPD function. The IPD function is described in Initial Position Detect

(IPD) . After the IPD completes, the MSS transitions to the Accelerate state.

Accelerate State The DRV10975 accelerates the motor according to the setting StAccel and StAccel2. After

applying the accelerate settings, the MSS advances to the Speed > Op2ClsThr judgment.

Speed>Op2ClsThr Judgment The motor accelerates until the drive rate exceeds the threshold configured by

the Op2ClsThr[4:0] settings. When this threshold is reached, the DRV10975 enters into the

ClosedLoop state.

ClosedLoop State In this state, the DRV10975 drives the motor based on feedback from the commutation

control algorithm.

DIR Pin Change Judgment If DIR pin get changed during any of above states, DRV10975 stops driving the

motor and restarts from the beginning.

8.4.3.1 ISD

The ISD function is used to identify the initial condition of the motor. If the function is disabled, the DRV10975

does not perform the initial speed detect function and treats the motor as if it is stationary.

Phase-to-phase comparators are used to detect the zero crossings of the BEMF voltage of the motor while it is

coasting (motor phase outputs are in high-impedance state). Figure 12 shows the configuration of the

comparators.

Figure 12. Initial Speed Detect Function

If the UW comparator output is lagging the UV comparator by 60°, the motor is spinning forward. If the UW

comparator output is leading the UV comparator by 60°, the motor is spinning in reverse.

The motor speed is determined by measuring the time between two rising edges of either of the comparators.

DRV10975ZPWPR Datasheet(PDF) 23 Page - Texas Instruments

DRV10975ZPWPR Datasheet(HTML) 23 Page - Texas Instruments

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