ATS642 Allegro MicroSystems, Inc., ATS642 Datasheet - Page 8

• Manufacturer Part Number: ATS642
• Description: Two-wire True Zero Speed Miniature Differential Peak-detecting Gear Tooth Sensor With Continuous Calibration
• Manufacturer: Allegro MicroSystems, Inc.

The colored area in the chart above shows the region of allow-
able air gap movement within which the sensor will continue
output switching. The output duty cycle is wholly dependent on
the target’s magnetic signature across the air gap range of move-
ment, and may not always be within specifi cation throughout the
entire operating region (to AG
ATS642LSH-DS
For more information on these fi gures and the calculations used to generate them, please refer to the Applications
Note Determining Allowable Air Gap Variation for the ATS642.
True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor
(a)
(OPmax)
Sensor
Characteristic Allowable Air Gap Movement
).
-0.2
1.2
1.0
0.8
0.6
0.4
0.2
0
0
TEAG
0.2
Allowable Air Gap Movement from TEAG
CAL
0.4
60-0 (60 Tooth Target)
ATS642LSH
(b)
0.6
ΔTEAG
0.8
Sensor
IN
(mm)
1.0
The axis parameters for the chart are defi ned in the draw-
ings below. As an example, assume the case where the air gap
is allowed to vary from from the nominal installed air gap
(TEAG
ΔTEAG
ΔTEAG
with an “x” in the chart above.
1.2
TEAG
CAL
OUT
IN
= 0.65 mm (shown in panel c). This case is plotted
1.4
CAL
, panel a) within the range defi ned by an increase of
OUT
= 0.35 mm (shown in panel b), and a decrease of
1.6
(c)
1.8
Sensor
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
TEAG
IN
8