ATS674 Allegro MicroSystems, ATS674 Datasheet - Page 6

• Manufacturer Part Number: ATS674
• Description: (ATS673 / ATS674) Self-Calibrating TPOS Gear Tooth Sensor Optimized
• Manufacturer: Allegro MicroSystems

ATS673 and
ATS674
Target/Gear Parameters for Correct TPOS Operation
For TPOS to function as specified, the target must generate a
minimum of 120 G difference between the magnetic field over
a tooth and the field over a valley, at the maximum installation
air gap. A target complying with the material and dimensions
cited for the reference target 8X, generates the required 120 G
differential.
REFERENCE TARGET 8X
Outside Diameter
Face Width
Circular Tooth Length
Circular Valley Length
Tooth Whole Depth
Material
Characteristic
Symbol
D
h
F
t
t
v
o
t
Self-Calibrating TPOS Gear Tooth Sensor Optimized
Branded Face
Figure 1. Configuration with Reference Target
Outside diameter of target
Breadth of tooth, with respect
to sensor
Length of tooth, with respect
to sensor; measured at D
Length of valley, with respect
to sensor; measured at D
of Sensor
CRS 1018
Reference Target (Gear) Information
Reference Target 8X
Test Conditions
for Automotive Cam Sensing Applications
o
o
The following recommendations should be followed in the
design and specification of targets:
• Tooth width, t ≥ 5 mm
• Valley width, t
• Valley depth, h
• Tooth thickness, F ≥ 5 mm
Typ.
23.6
23.6
120
6
5
–
Units
mm
mm
mm
mm
mm
–
v
t
> 13 mm
> 5 mm
Branded Face
of Sensor
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Air Gap
Symbol Key
6