DRV10983_15 Datasheet, PDF (37/57 Pages) Texas Instruments – DRV10983 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

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DRV10983
SLVSCP6B – JULY 2014 – REVISED FEBRUARY 2015
The value stored in IPD Position corresponds to one of the six motor positions plus the IPD Advance Angle as
shown in Table 7. For more about information about IPD, refer to IPD.
Table 7. IPD Position Read Back
U
VU
VU
VU
V_U
VU
V
N
W
Rotor position (°)
0
Data1
0
IPD Advance
Angle
30
Data2
22
Register date
W
W
W
60
120
180
43
85
128
60
90
120
44
63
85
(Data1 + Data2) mod (256)
S
W
W
240
300
171
213
9.4.11.6 Supply Voltage Read Back
The power supply is monitored periodically during motor operation. This information is available in register
SupplyVoltage. The power supply voltage is recorded as shown in Equation 11.
V_POWERSUPPLY (V) = Supply Voltage × 30 V / 256
(11)
9.4.11.7 Speed Command Read Back
The DRV10983 converts the various types of speed command into a speed command value (SpeedCmd) as
shown in Figure 39. By reading SpeedCmd, the user can observe PWM input duty (PWM digital mode), analog
voltage (analog mode), or I²C data (I²C mode). This value is calculated as shown in Equation 12.
Equation 12 shows how the speed command as a percentage can be calculated and set in SpeedCmd.
Duty_SPEED (%) = SpeedCmd × 100% / 255
where
• Duty_SPEED = Speed command as a percentage
• SpeedCmd = Register value
(12)
9.4.11.8 Speed Command Buffer Read Back
If acceleration current limit and AVS are enabled, the PWM duty cycle output (read back at spdCmdBuffer) may
not always match the input command (read back at SpeedCmd) shown in Figure 39. Refer to AVS Function and
Current Limit.
By reading the value of spdCmdBuffer, the user can observe buffered speed command (output PWM duty cycle)
to the motor.
Equation 13 shows how the buffered speed is calculated.
Duty_OUTPUT (%) = spdCmdBuffer × 100% / 255
where
• Duty_OUTPUT = The maximum duty cycle of the output PWM, which represents the output amplitude in
percentage.
• spdCmdBuffer = Register value
(13)
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