True Zero Speed, Low Jitter, High Accuracy
Position Sensor IC
ATS627LSG
5
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
B
SEQ(n)
B
SEQ(n+1)
B
SEQ
(max)
B
SEQ
(min)
Sequential Regions
Sequential Regions
Signature
Region
B
SIG
V
PROC
Target
T
VPROC
V
PROC
= the processed analog signal of the sinusoidal magnetic input (per channel)
T
TARGET
= period between successive sensed target mechanical edges of the same
orientation (either both rising or both falling)
T
TARGET
Valley
Tooth
Figure 2. Definition of T
TARGET
Figure 3. Differential signature amplification and sequential signal variation
t
d(OUT)
t
f(OUT)
90% V
OUT
10% V
OUT
V
PROC
(high)
V
PROC(BOP)
V
PROC(BRP)
V
OUT
(high)
V
PROC
(low)
V
OUT
(low)
Time
Time
t
d(OUT)
t
r(OUT)
Figure 1. Definition of Output Delay Time, t
d(OUT)
, Output Fall Time, t
f(OUT)
, and Output Rise Time, t
r(OUT)
.
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