DRV10983-Q1 Datasheet, PDF (23/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

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DRV10983-Q1
SLVSD14 – JUNE 2017
Speed>RvsDrThr.
Speed>RvsDrThr Judgment The motor start sequencer checks to see if the reverse speed is greater than the
threshold defined by RvsDrThr[1:0]. If it is, then the MSS returns to the ISD state to allow the motor
to decelerate. This prevents the DRV10983-Q1 device 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[1:0], 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
advances to the BrkEn judgment.
RvsDr State The DRV10983-Q1 device 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 a 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 DRV10983-Q1 device performs the align function (see Align). After the align completes, the
MSS transitions to the Accelerate state.
IPD State The DRV10983-Q1 device performs the IPD function. The IPD function is described in IPD. After
the IPD completes, the MSS transitions to the accelerate state.
Accelerate State The DRV10983-Q1 device accelerates the motor according to the settings of 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 DRV10983-Q1 device enters into
the ClosedLoop state.
ClosedLoop State In this state, the DRV10983-Q1 device drives the motor based on feedback from the
commutation control algorithm.
DIR Pin Change Judgment If the DIR pin is changed during any of above states, DRV10983-Q1 device stops
driving the motor and restarts from the beginning.
8.4.3.1 Initial Speed Detect
The ISD function is used to identify the initial condition of the motor. If the function is disabled, the DRV10983-Q1
device 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 motor’s BEMF voltage while it is
coasting (motor phase outputs are in the high-impedance state). Figure 15 shows the configuration of the
comparators.
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