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ATS642LSH Datasheet Preview

ATS642LSH Datasheet

Peak-Detecting Gear Tooth Sensor

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ATS642LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
Features and Benefits
Running mode calibration for continuous optimization
Single chip IC for high reliability
Internal current regulator for 2-wire operation
Small mechanical size (8 mm diameter × 5.5 mm depth)
Precise duty cycle signal over operating temperature range
Large operating air gaps
Automatic Gain Control (AGC) for air gap independent
switchpoints
Automatic Offset Adjustment (AOA) for signal processing
optimization
True zero-speed operation
Undervoltage lockout
Wide operating voltage range
Package: 4-pin Module (suffix SH)
Not to scale
Description
The ATS642LSH is an optimized Hall effect sensing integrated
circuit and magnet combination that provides a user-friendly
solution for true zero-speed digital gear-tooth sensing in two-
wire applications. The sensor consists of a single-shot molded
plastic package that includes a samarium cobalt magnet, a
pole piece, and a Hall effect IC that has been optimized to the
magnetic circuit. This small package, with 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
sensor and signal processing that switches in response to
differential magnetic signals created by ferrous gear teeth.
The circuitry contains a sophisticated digital circuit to reduce
magnet and system offsets, to calibrate the gain for air gap
independent switchpoints, and to achieve true zero-speed
operation. Signal optimization occurs at power-up through
the combination of offset and gain adjust and is maintained
throughout the operating time with the use of a running mode
calibration. The running mode calibration allows immunity to
environmental effects such as microoscillations of the target
or sudden air gap changes.
The regulated current output is configured for two wire
applications and the sensor is ideally suited for obtain-
Continued on the next page…
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.
Functional Block Diagram
Hall
Amplifier
Gain
VCC
Automatic Offset
Control
AOA DAC
Tracking
DAC
Peak Hold
AGC DAC
Gain Control
ATS684LSH-DS, Rev. 2
MCO-0000868
Internal Regulator
Test Signals
GND
Test
May 21, 2020




Allegro MicroSystems

ATS642LSH Datasheet Preview

ATS642LSH Datasheet

Peak-Detecting Gear Tooth Sensor

No Preview Available !

ATS642LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
Description (continued)
ing speed and duty cycle information in ABS (antilock braking
systems). The 1.5 mm Hall element spacing is optimized for fine
pitch gear-tooth-based configurations. The package is lead (Pb)
free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
ATS642LSHTN-I1-T
ICC Typical
6.0 Low to 14.0 High mA
ATS642LSHTN-I2-T
7.0 Low to 14.0 High mA
*Contact Allegrofor additional packing options
Packing*
Tape and reel, 13-inch reel 800 pieces/reel
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse_Supply Voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
TA
TJ(max)
Tstg
Range L
Notes
Rating
Unit
28
V
–18
V
–40 to 150
ºC
165
ºC
–65 to 170
ºC
Pin-out Diagram
12 3 4
Terminal List
Number
Name
1
VCC
2
NC
3
Test pin
4
GND
Function
Connects power supply to chip
No connection
Float or tie to GND
Ground terminal
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com


Part Number ATS642LSH
Description Peak-Detecting Gear Tooth Sensor
Maker Allegro MicroSystems
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ATS642LSH Datasheet PDF





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