
ATS650LSH
ATS650LSH-DS Rev. 0
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ..........................................28 V
Reverse-Supply Voltage, VRCC ........................–18 V
Reverse-Output Current, IROUT.....................–50 mA
Reverse-Output Voltage, VROUT ...................–50 mA
Operating Temperature
Ambient, TA................................–40C to 150C
Maximum Junction, TJ(MAX)......................165C
Storage Temperature, TS ..................–65C to 170C
Two-Wire Direction Detection Gear Tooth Sensor
with Diagnostic Output
Use the following complete part numbers when ordering:
Package SH
Features and Benefits
1. VCC
2. Test pin, Channel 1
3. Test pin, Channel 2
4. GND
1 2
3 4
The ATS650 is an optimized Hall effect sensor combining sensor element, inte-
grated circuit, and magnet in a manufacturer-friendly solution for digital gear-
tooth sensing in two-wire applications. It provides true zero-speed sensing as well
as detection of the direction of target movement. The device 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 can be easily assembled and used in conjunction with a wide variety of
gear shapes and sizes.
The Hall effect sensor IC is a single chip solution that integrates three highly sen-
sitive Hall effect transducers and precise signal processing circuitry that switches
in response to magnetic signals created by ferrous gear teeth.
The circuitry contains a sophisticated digital circuit to minimize the effects of
magnet and system offsets and to achieve optimal, true zero-speed operation.
Signal optimization is performed each time the sensor is powered-on. Internal
circuitry maintains signal optimization and encodes diagnostic information in the
output signal of the device.
The regulated current output is configured for two-wire operation. It has direction
and diagnostic capabilities incorporated into the speed signal output.
The ATS650 is ideal for obtaining speed, direction, and diagnostic information
using gear-tooth–based targets found in ABS and transmission applications.
For ring magnet applications, use the A1650.
Fully optimized digital differential gear tooth sensor
Single chip sensing IC for high reliability
Small mechanical size (8 mm diameter x 5.5 mm depth)
Internal current regulator for 2-wire operation
Rotational direction detection
Digital output protocol with integrated diagnostic information
On-chip temperature sensing for diagnostic capability
On-chip air gap diagnostics
Automatic Gain Control (AGC) and reference adjust circuit
3-bit factory trimming for tight pulse width accuracy
True zero-speed operation
Wide operating voltage range
Undervoltage lockout
Defined power-on state
ESD and reverse polarity protection
Part Number
ICC Typical (mA)
ATS650LSH-I1
4.0 Low to 16.0 High
ATS650LSH-I2
5.9 Low to 16.8 High
Preliminary Data Sheet
Subject to Change Without Notice
June 3, 2004
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.