True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor IC
ATS625LSG
12
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Device Operation Description
Power-On State
At power-on, the device is guaranteed to initialize in the OFF
state, with V
OUT
high.
First Edge Detection
The device uses the first two mechanical edges to synchronize
with the target features (tooth or valley) and direction of rotation
of the target. The device is synchronized by the third edge. The
actual behavior is affected by: target rotation direction relative to
the package, target feature (tooth, rising edge, falling edge, or
valley) that is centered on the device at power-on, and fact that
the chip powers-on in the OFF state, with V
OUT
high, regardless
of the eventual direction of target rotation. The interaction of
these factors results in a number of possible power-on scenarios.
These are diagrammed in figure 6. In all start-up scenarios, the
correct number of output edges is provided, but the accuracy of
the first two edges may be compromised.
Target Mechanical Profile
IC Output, V
OUT
(Start-up over valley)
Target Magnetic Profile
(Start-up over tooth)
(Start-up over rising edge)
(Start-up over falling edge)
Target Mechanical Profile
IC Output, V
OUT
(Start-up over valley)
Target Magnetic Profile
(Start-up over tooth)
(Start-up over rising edge)
(Start-up over falling edge)
IC start-up location
IC start-up location
Package
Pin 4 Side
Package
Pin 1 Side
Target Motion Relative to Package
Package
Pin 1 Side
Package
Pin 4 Side
Target Motion Relative to Package
(A) Target relative movement
as shown in figure 3. Output
signal is high over the tooth.
(B) Target relative movement
opposite that shown in figure 3.
Output signal is low over the tooth.
Figure 6. Start-up Position And Relative Motion Effects on First Device Output Switching. Panel A shows the effects when the
target is moving from pin 1 toward pin 4 of the device; V
OUT
goes high at the approach of a tooth. When the target is moving
in the opposite direction, as in panel B, the polarity of the device output inverts; V
OUT
goes low at the approach of a tooth.
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