A4980LP View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A4980LP' PDF : 44 Pages View PDF
A4980
Automotive, Programmable Stepper Driver
32/63=50.8% and so on. The value at each Step Angle Number is
then assigned to its corresponding phase table values as follows:
PT n 1 DIn
where DIn represents the digitized value of the current at Step
Angle Number n.
A selection of the values and the corresponding phase current
table entries is shown in figure14. The full set of phase current
table values is shown in the table below.
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Value 10 20 25 28 29 30 31 32 35 40 50 58 60 62 63 63
PT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
These 16 values are then loaded sequentially into the phase
current table through the Phase Table Load register of the serial
interface. Each value is then distributed to the appropriate Step
Angle Numbers as described above and as shown in table 4C in
the Phase Table Load Register section.
A representation of the final result is shown in figure 15. This
is the digitized version of the required current profile shown in
figure 13.
Figure 15. Resulting example current profile
Allegro MicroSystems, Inc.
30
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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