Description
The components in speed sensing applications continue to
diminish in size to meet spatial constraints and weight reduction
requirements. As the geometries of gears become smaller, this
can compromise the capabilities of a gear speed sensor. The
ATS645 Hall-element-to-Hall-element spacing of only 1.5 mm
makes this device uniquely capable of accommodating very
fine-pitch gears. In addition, the ATS645 signal peak-detecting
algorithm supports consistent switching at relatively large air
gaps, where the peak-to-peak amplitude is small. These features
make the ATS645 the ideal solution to detect the speed of fine-
pitch targets such as those found in ABS (antilock braking)
systems.
The ATS645 combines a Hall-effect sensing integrated circuit
and rare earth pellet to provide a manufacturer-friendly solution
for true zero-speed digital gear-tooth sensing in two-wire
applications. The device consists of a single-shot molded
plastic package that includes a samarium cobalt pellet, a
pole piece, and a Hall-effect integrated circuit that has been
optimized to the magnetic circuit. This small package can be
easily assembled and used in conjunction with a wide variety
of gear shapes and sizes.
ATS645-DS, Rev. 6
Features and Benefits
" Fully optimized differential digital gear tooth sensor IC
" Single chip IC for high reliability
" Internal current regulator for 2-wire operation
" Small mechanical size (8 mm diameter x 5.5 mm depth)
" Air gap independent switchpoints
" Digital output representing gear profile
" Precise duty cycle signal over operating temperature range
" Large operating air gaps
" Automatic Gain Control (AGC)
" Automatic Offset Adjustment (AOA)
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor IC
Continued on the next page&
Functional Block Diagram
Not to scale
Packages: 4 pin SIP (suffix SH)
ATS645LSH
Continued on the next page&
VCC
Automatic Offset
Control
AOA DAC
Hall
Amplifier
AGC DAC
Gain
Tracking
DAC
Peak Hold
Internal Regulator
Test Signals
GND
Test
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