AS5140 AB austriamicrosystems, AS5140 AB Datasheet - Page 18

• Manufacturer Part Number: AS5140 AB
• Description: BOARD ADAPTER AS5140
• Manufacturer: austriamicrosystems

Specifications of AS5140 AB

• Sensor Type: Magnetic, Rotary Position
• Sensing Range: 360°
• Interface: Serial
• Voltage - Supply: 5V
• Embedded: No
• Utilized Ic / Part: AS5140
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Sensitivity: -
• Other names: AS5140H AB; AS5140H AB

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
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
and
Figure 12. U, V and V-Signals for BLDC Motor Commutation (Div1=0, Div0=0)
Figure 13. U, V and W-Signals for 2Pole BLDC Motor Commutation (Div1=1, Div0=0)
www.austriamicrosystems.com/AS5140H
Figure
Position:
CW Direction
W
U
V
Angle:
13) is calculated by multiplying each transition position by the angular value of 1 count:
CW Direction
Position:
V
W
U
Commutation - Mode 3.0
Angle:
Commutation - Mode 3.2
0.0
0
0.0
0
Width : 256 Steps
29.88
85
60.12
171
60.12
171
(One-pole-pair)
Width : 512 Steps
(Two-pole-pairs)
Angle [deg] = Position x (360 degree / 1024)
256
90.0
Width : 256 Steps
119.88
341
119.88
341
150.12
427
Revision 1.4
180.0
512
180.0
512
Table
20.
209.88
597
240.12
683
Width : 512 Steps
240.12
683
270.00
768
299.88
853
299.88
853
330.12
939
360.0
0
360.0
0
Figure 12
(EQ 4)
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