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AS5140H
Data Sheet - D e t a i l e d D e s c r i p t i o n
7.5 Brushless DC Motor Commutation Mode
Brushless DC motors require angular information for stator commutation. The AS5140H provides U-V-W commutation signals for one and two
pole pair motors. In addition to the three-phase output signals, the step (LSB) output at pin 12 allows high accuracy speed measurement. Two
resolutions (9 or 10 bit) can be selected by programming Div0 according to Table 20 .
Mode 3.0 (3.1) is used for brush-less DC motors with one-pole pair rotors. The three phases (U, V, W) are 120 degrees apart, each phase is 180
degrees on and 180 degrees off.
Mode 3.2 (3.3) is used for motors with two pole pairs requiring a higher pulse count to ensure a proper current commutation. In this case the
pulse width is 256 positions, equal to 90 degrees. The precise physical angle at which the U, V and W signals change state (“Angle” in Figure 12
and Figure 13 ) is calculated by multiplying each transition position by the angular value of 1 count:
Angle [deg] = Position x (360 degree / 1024)
Figure 12. U, V and V-Signals for BLDC Motor Commutation (Div1=0, Div0=0)
(EQ 4)
Commutation - Mode 3.0
(One-pole-pair)
U
V
W
CW Direction
Width : 512 Steps
Width : 512 Steps
Position:
Angle:
0
0.0
171
60.12
341
119.88
512
180.0
683
240.12
853
299.88
0
360.0
Figure 13. U, V and W-Signals for 2Pole BLDC Motor Commutation (Div1=1, Div0=0)
Commutation - Mode 3.2
Width : 256 Steps
U
V
W
CW Direction
(Two-pole-pairs)
Width : 256 Steps
Position:
Angle:
0
0.0
85
29.88
171
60.12
256
90.0
341
119.88
427
150.12
512
180.0
597
209.88
683
240.12
768
270.00
853
299.88
939
330.12
0
360.0
www.austriamicrosystems.com/AS5140H
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