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DRV10963 Datasheet(PDF) 12 Page - Texas Instruments

Part No. DRV10963
Description  DRV10963 5-V, Three-Phase, Sensorless BLDC Motor Driver
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

DRV10963 Datasheet(HTML) 12 Page - Texas Instruments

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Frequency Overflow
Bemf Abnormal
Speed Abnormal
Closed Loop Stuck
Open Loop Stuck
Or
Tri-state
and Restart
Logic
DRV10963
SLAS955A – MARCH 2013 – REVISED JULY 2015
www.ti.com
Table 5. Motor Direction Phase Sequencing
FR = 10
FR = 01
Motor direction
U->V->W
U->W->V
7.3.4 Motor Frequency Feedback (FG)
During operation of the DRV10963 device, the FG pin provides an indication of the speed of the motor. The
output provided on this pin can be configured by use of an OTP setting (FGOPT) and by applying a logic signal
to the FGS pin. The configuration of this output is defined in Table 6.
Table 6. FG Motor Status Speed Indicator Configuration
MOTOR CONDITION
(FGS = 1)
FGOPT=1,(FGS = 0)
FGOPT=0,(FGS = 0)
DRV10963xxDSNR Normal
Toggles once every 2
Toggles once every 3
Toggles once per electrical cycle
Operation
electrical cycles
electrical cycles
As seen in Table 6, the FG pin can be configured to toggle either once per electrical cycle, once per 2 electrical
cycles or once per every 3 electrical cycles. Using this information and the number of pole pairs in the motor, the
mechanical speed of the motor can be determined.
The formula to determine the speed of the motor is:
If FGS = 1, RPM = (FREQFG × 60)/ number of pole pairs
(2)
If FGS = 0, FGOPT=1, RPM = (FREQFG × 120)/ number of pole pairs
(3)
or
If FGS = 0, FGOPT=0, RPM = (FREQFG × 180)/ number of pole pairs
(4)
The FG pin has built in short circuit protection, which limits the current in the event that the pin is shorted to VCC.
The current will be limited to ISC_FG.
7.3.5 Lock Detection
When the motor is locked by some external condition the DRV10963 will detect the lock condition and will take
action to protect the motor and the device. The lock condition must be properly detected whether it occurs as a
result of a slowly increasing load or a sudden shock.
The DRV10963 reacts to lock conditions by stopping the motor drive. To stop driving the motor the phase
outputs are placed into a high impedance state. To prevent the current which is flowing in the motor from being
returned to the power supply (VCC) the DRV10963 uses an ANTI VOLTAGE SURGE feature. This feature is
described in a following section. After successfully transitioning into a high impedance state as the result of a
lock condition the DRV10963 will attempt to restart the motor after TOFF_LOCK seconds.
The DRV10963 has a comprehensive lock detect function which includes 5 different lock detect schemes. Each
of these schemes detects a particular condition of lock as illustrated in Figure 9.
Figure 9. Lock Detect
The behavior of each lock detect scheme is described in the following sections.
12
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Product Folder Links: DRV10963


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