3967 View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'3967' PDF : 15 Pages View PDF
A3967
Microstepping Driver with Translator
Quarter Step Operation
MS1 = L, MS2 = H, DIR = H
STEP
INPUT
100%
70.7%
38.3%
PHASE 1
CURRENT
–38.3%
–70.7%
–100%
SLOW
DECAY
MIXED
DECAY
SLOW
DECAY
MIXED
DECAY
100%
70.7%
38.3%
PHASE 2
CURRENT
–38.3%
–70.7%
–100%
MIXED
DECAY
SLOW
DECAY
MIXED
DECAY
SLOW
DECAY
Dwg. WK-004-17
The mixed-decay mode is controlled by the percent fast decay voltage (VPFD). If the
voltage at the PFD input is greater than 0.6VCC then slow-decay mode is selected. If the
voltage on the PFD input is less than 0.21VCC then fast-decay mode is selected. Mixed
decay is between these two levels.
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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