ATS682 Datasheet, PDF (1/16 Pages) Allegro MicroSystems – Miniature, Two-Wire, True Zero Speed Differential Peak-Detecting Sensor IC

ATS682LSH
Miniature, Two-Wire, True Zero Speed
Differential Peak-Detecting Sensor IC
Features and Benefits
▪ True zero-speed operation
▪ Automatic Gain Control (AGC) for air gap independent
switchpoints
▪ Automatic Offset Adjustment (AOA) for signal processing
optimization
▪ Running-mode calibration for continuous optimization
▪ Precise duty cycle over operating temperature range
▪ Internal current regulator for two-wire operation
▪ Undervoltage lockout
▪ On-chip voltage regulator with wide operating voltage
range and stability in the presence of a variety of complex
load impedances
▪ Single chip IC for high reliability
Package: 4-pin SIP (suffix SH)
Not to scale
Description
The ATS682LSH is a Hall-effect integrated circuit and rare
earth pellet combination that provides a user-friendly solution
for true zero-speed digital gear-tooth sensing in two-wire
applications. This small package, with an optimized two-wire
leadframe, can be easily assembled and used in conjunction
with a wide variety of gear shapes and sizes.
The integrated circuit incorporates a dual-element Hall-effect
circuit and signal processing that switches in response to
differential magnetic signals created by ferrous gear teeth.
The circuitry contains a sophisticated digital circuit that
reduces magnet and system offsets, calibrates the gain for air
gap independent switchpoints and provides true zero-speed
operation.
Signal optimization occurs at power-up through the adjustment
of offset and gain and is and is maintained throughout operation
with the use of a running-mode calibration scheme. Running-
mode calibration provides immunity from environmental effects
such as micro-oscillations of the sensed target or sudden air
gap changes.
The regulated current output is configured for two-wire interface
circuitry and is ideally suited for obtaining speed information in
wheel speed applications. The Hall element spacing is optimized
for high resolution, small diameter targets. The package is lead
(Pb) free, with 100% matte tin lead frame plating.
Functional Block Diagram
Hall
Amplifier
Gain
VCC
Automatic Offset
Control
AOA DAC
Tracking
DAC
Peak Hold
AGC DAC
Gain Control
ATS682-DS, Rev. 2
Internal Regulator
Test Signals
GND
Test