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Revision 1.4
18 - 27
AS5132
Datasheet - Detailed Description
Figure 18. Block Diagram of the Pre-Commutation Function
Note:   The dynamic pre-commutation is set to zero always if the direction is changed over the pin DIR. A new value PRE_COM_DYN must be 
written again. The static pre-commutation is always enabled and will shift the output.
7.3.4   Commutation Output UVW
The pre-commutation function is used only at the U,V,W output. Figure 19 shows the transition on the outputs U,V,W in case of a two pole pair
configuration. The static pre-commutation value was set to 12 degrees.
Figure 19. UVW Output Transitions with Pre-Commutation
PC Adder stat.
Dir
PC Adder dyn.
Dir
Tracking ADC
ANGLE<8:0>
DIR
SSI value
PRE_COM_DYN<6:0>
Zero Angle
Adder
OTP value
zero_ang<8:0>
+/-
+/-
SSI Read Angle
PWM
PWM ENC
U, V, W
ABI ENC
A, B, Index
UVW ENC
OTP value
PRE_COM_STAT<2:0>
0?mech.
0?electr.
30?mech.
60?electr.
60?mech.
120?electr.
90?mech.
180?electr.
120?mech.
240?electr.
150?mech.
300?electr.
180?mech.
0?electr.
210?mech.
60?electr.
240?mech.
120?electr.
270?mech.
180?electr.
300?mech.
240?electr.
330?mech.
300?electr.
-12?mech.
0?electr.
18?mech.
60?electr.
48?mech.
120?electr.
78?mech.
180?electr.
108?mech.
240?electr.
138?mech.
300?electr.
68?mech.
0?electr.
198?mech.
60?electr.
228?mech.
120?electr.
258?mech.
180?electr.
318?mech.
300?electr.
288?mech.
240?electr.
Counter Clockwise rotation
12?static pre-commutation
Clockwise rotation
12?static pre-commutation
0?mech.
0?electr.
30?mech.
60?electr.
60?mech.
120?electr.
90?mech.
180?electr.
120?mech.
240?electr.
150?mech.
300?electr.
180?mech.
0?electr.
210?mech.
60?electr.
240?mech.
120?electr.
270?mech.
180?electr.
300?mech.
240?electr.
330?mech.
300?electr.
12?mech.
0?electr.
42?mech.
60?electr.
72?mech.
120?electr.
102?mech.
180?electr.
132?mech.
240?electr.
162?mech.
300?electr.
192?mech.
0?electr.
222?mech.
60?electr.
252?mech.
120?electr.
282?mech.
180?electr.
342?mech.
300?electr.
312?mech.
240?electr.
-12?/DIV>
+12?/DIV>
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