ATS682LSH
Miniature, Two-Wire, True Zero Speed
Differential Peak-Detecting Sensor IC
Features and Benefits Description
True zero-speed operation
The ATS682LSH is a Hall-effect integrated circuit and rare
Automatic Gain Control (AGC) for air gap independent
earth pellet combination that provides a user-friendly solution
switchpoints
for true zero-speed digital gear-tooth sensing in two-wire
Automatic Offset Adjustment (AOA) for signal processing
applications. This small package, with an optimized two-wire
optimization
leadframe, can be easily assembled and used in conjunction
Running-mode calibration for continuous optimization
with a wide variety of gear shapes and sizes.
Precise duty cycle over operating temperature range
The integrated circuit incorporates a dual-element Hall-effect
Internal current regulator for two-wire operation
circuit and signal processing that switches in response to
Undervoltage lockout
differential magnetic signals created by ferrous gear teeth.
On-chip voltage regulator with wide operating voltage
The circuitry contains a sophisticated digital circuit that
range and stability in the presence of a variety of complex
reduces magnet and system offsets, calibrates the gain for air
load impedances
gap independent switchpoints and provides true zero-speed
Single chip IC for high reliability
operation.
Signal optimization occurs at power-up through the adjustment
Package: 4-pin SIP (suffix SH)
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.
Not to scale
Functional Block Diagram
VCC
Hall
Gain
Amplifier
Automatic Offset
AOA DAC AGC DAC Internal Regulator
Control
Gain Control
Tracking
Peak Hold
DAC
GND
Test
Test Signals
ATS682-DS, Rev. 2Miniature, Two-Wire, True Zero Speed
ATS682LSH
Differential Peak-Detecting Sensor IC
Selection Guide
Part Number Packing*
ATS682LSHTN-T 800 pieces per 13-in. reel
*Contact Allegro for additional packing options
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Unit
Supply Voltage V Refer to Power Derating curve 28 V
CC
Reverse Supply Voltage V 18 V
RCC
Operating Ambient Temperature T Range L 40 to 150 C
A
Maximum Junction Temperature T (max) 165 C
J
Storage Temperature T 65 to 170 C
stg
Terminal List
Pin-out Diagram
Number Name Function
1 VCC Connects power supply to chip
2 NC No connection
3 TEST Test (float or tie to ground)
4 GND Ground terminal
1243
Allegro MicroSystems, LLC
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com