DRV10983ZPWPR datasheet(21/58 Pages) TI1

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Time

Speed

Closed loop

Reverse Drive

Op2ClsThr

Open loop

RevDrThr

Coasting

60 degrees

DRV10983

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SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Figure 11. 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.

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].

9.4.3.2 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 DRV10983, which can transition directly into the closed loop running state without

needing to stop the motor.

9.4.3.3 Reverse Drive

The ISD function measures the initial speed and the initial position; the DRV10983 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 12). If the reverse speed is greater than the threshold configured in RvsDrThr[1:0], then the

DRV10983 waits until the motor coasts to a speed that is less than the threshold before driving the motor to

reverse accelerate.

Figure 12. Reverse Drive Function

DRV10983ZPWPR Datasheet(PDF) 21 Page - Texas Instruments