DRV10983-Q1 Datasheet, PDF (22/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

DRV10983-Q1
SLVSD14 – JUNE 2017
8.4.3 Motor Start Sequence
Figure 14 shows the motor-start sequence implemented in the DRV10983-Q1 device.
Power on
DIR pin
change
ISDen
N
Y
ISD
www.ti.com
Y
Forward
N
Y
Speed >
RvsDrThr
N
RvsDrEn
Y
RvsDr
N
Speed <
ISDThr
Y
BrkEn
N
Y
N
Brake
Time >
Y
BrkDoneThr
N
Accelerate
IPDEn
Y
N
Align
IPD
N
Speed >
Op2CIsThr
ClosedLoop
Y
Figure 14. 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 DRV10983-Q1 device comes out of either standby or
sleep mode.
ISDen Judgment After power-on, the DRV10983-Q1 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 Initial Speed Detect).
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 DRV10983-Q1 device 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
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