Self-Calibrating TPOS Gear Tooth Sensor ICs
Optimized for Automotive Cam Sensing Applications
ATS673 and
ATS674
6
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
REFERENCE TARGET 8X
Characteristic    Symbol
Test Conditions
Typ.  Units
Symbol Key
Outside Diameter
D
o
Outside diameter of target
120   mm
tV
?SPAN class="pst ATS674LSETN-LT-T_2595586_6">D
O
h
t
F
Branded Face
of Package
Air Gap
Face Width
F
Breadth of tooth, with respect to
branded face
6    mm
Circular Tooth Length
t
Length of tooth, with respect to
branded face; measured at D
o
23.6   mm
Circular Valley Length
t
v
Length of valley, with respect to
branded face; measured at D
o
23.6   mm
Tooth Whole Depth
h
t
5    mm
Material
CRS 1018
    
Reference Target 8X
of Package
Branded Face
Reference Target (Gear) Information
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.
The following recommendations should be followed in the
design and specification of targets:
" Tooth width, t e 5 mm
" Valley width, t
v
 > 13 mm
" Valley depth, h
t
 > 5 mm
" Tooth thickness, F e 5 mm
Figure 1. Configuration with Reference Target
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