DRV10975ZPWPR datasheet(24/65 Pages) TI1

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Time

Speed

Closed loop

Reverse Drive

Op2ClsThr

Open loop

RevDrThr

Coasting

DRV10975, DRV10975Z

SLVSCP2E – JANUARY 2015 – REVISED MAY 2018

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If neither of the comparator outputs toggle for a given amount of time, the condition is defined as stationary. The

amount of time can be programmed by setting the register bits ISDThr[1:0].

8.4.3.2 Motor Resynchronization

The resynchronize function works when the ISD function is enabled and determines that the initial state of the

motor is spinning in the forward direction. The speed and position information measured during ISD are used to

initialize the drive state of the DRV10975, which can transition directly into the closed loop running state without

needing to stop the motor.

8.4.3.3 Reverse Drive

The ISD function measures the initial speed and the initial position; the DRV10975 reverse drive function acts to

reverse accelerate the motor through zero speed and to continue accelerating until the closed loop threshold is

reached (see Figure 13). If the reverse speed is greater than the threshold configured in RvsDrThr[1:0], then the

DRV10975 waits until the motor coasts to a speed that is less than the threshold before driving the motor to

reverse accelerate.

Figure 13. Reverse Drive Function

Reverse drive is suitable for applications where the load condition is light at low speed and relatively constant

and where the reverse speed is low (that is, a fan motor with little friction). For other load conditions, the motor

brake function provides a method for helping force a motor which is spinning in the reverse direction to stop

spinning before a normal start-up sequence.

8.4.3.4 Motor Brake

The motor brake function can be used to stop the spinning motor before attempting to start the motor. The brake

is applied by turning on all three of the low-side driver FETs.

If the motor is spinning at a speed that is greater than the braking threshold (configured by BrkDoneThr[2:0]),

then dynamic braking acts to stop the spinning (whether forward or reverse). After the motor is stopped (that is,

the motor speed is less than the BrkDoneThr[2:0]), the motor position is unknown. To proceed with restarting in

the correct direction, the IPD or Align and Go algorithm needs to be implemented. The motor start sequence is

the same as it would be for a motor starting in the stationary condition.

The motor brake function can be disabled. The motor skips the brake state and attempts to spin the motor as if it

were stationary. If this happens while the motor is spinning in either direction, the start-up sequence may not be

successful.

DRV10975ZPWPR Datasheet(PDF) 24 Page - Texas Instruments

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